Temporary plugging acidizing is a critical well stimulation technique for improving water absorption profiles and addressing low/zero water intake in individual intervals of heterogeneous reservoirs, serving as a core measure for production stabilization and enhancement in mature oilfields. However, there remains an urgent demand for balanced stimulation technologies tailored to the unique reservoir conditions of offshore water injection wells. In this study, targeting the reservoir characteristics of the target offshore oilfield, we systematically investigated the effects of Temporary Plugging Agent (TPA) concentration, acid injection slug size, injection rate, and permeability contrast on plugging and diversion performance. Three core innovations are achieved: (1) optimization of a high-strength self-diverting TPA; (2) development of a matched composite retarded acid system; (3) establishment of quantitative process parameter design methods for temporary plugging acidizing in heterogeneous reservoirs. Based on these, a high-strength balanced plugging removal technology for water injection wells was developed. This technology enables balanced stimulation of thin interbeds in offshore water injection wells with large vertical spans, long treatment intervals, and significant variations in reservoir properties and formation pressure, providing robust technical support for optimizing water absorption profiles, achieving precise layer-by-layer stimulation, and enhancing waterflood development efficiency.

Functionalized ionic liquids (FILs), as novel catalysts, offered a promising way for synthesizing methylacrolein (MAL) from formaldehyde (FA) and propionaldehyde (PA) via Mannich reaction. However, the high dosage and the difficulty in separating and recycling of FILs hindered their practical application in industry. Although immobilization of FILs onto solid supports can partially address these issues, it often leads to a significant loss of catalytic activity. To address these challenges, this work developed an immobilized functional ionic liquid catalyst ([HDEA]Ac/SG) with exceptional structural stability and high catalytic activity via sol-gel method. Taking advantage of the abundant surface hydroxyl groups of silica gel and hierarchical porosity, [HDEA]Ac was firmly immobilized within the support through interfacial hydrogen bonding and confinement effect. Benefiting from the reduced mass transfer resistance of reactants and products, the enhanced FIL dispersion in support, and the increased FIL site accessibility endowed by the hierarchical porous structure of silica gel, the [HDEA]Ac/SG catalyst achieved a PA conversion of 91.2% and a MAL yield of 80.2%, the highest values reported to date for heterogeneous systems. In situ FT-IR and Raman spectroscopy confirmed that the reaction mechanism over [HDEA]Ac/SG follows a typical Mannich pathway, analogous to that in homogeneous systems. The catalyst exhibited excellent recyclability and retained its catalytic activity after at least 10 cycles. This work provides a cost-effective and environmentally benign strategy for designing stable and efficient Mannich reaction catalysts, bridging the performance gap between homogeneous and heterogeneous systems in the synthesis of MAL from FA and PA.

The direct synthesis of diphenyl carbonate (DPC) from CO2 and phenol has attracted much attention as it can realize CO2 utilization and can avoid phosgene usage in the traditional production process. Nevertheless, the achievement of high DPC yields is hindered by the difficult activation of CO2. Herein, a dual metal incorporated ZnCeZrOX catalyst was synthesized, and the synergistic catalysis mechanism between oxygen vacancies and Lewis acid sites was systematically demonstrated. Raman and EPR analyses revealed that the simultaneous introduction of Zn and Ce effectively promoted the formation of abundant oxygen vacancies, thereby enhancing the adsorption and activation of CO2. NH3-TPD and Py-IR characterizations demonstrated that dual doping of Zn and Ce modulated Lewis acidity, benefiting the adsorption of phenol and intermediates. Compared with ZnZrOX and CeZrOX, the ZnCeZrOX catalyst demonstrated superior catalytic performance, achieving a phenol conversion of 47.6% and a DPC selectivity of 82.5%. DFT and in situ FTIR analyses indicated that oxygen vacancies activated CO2 to form b-CO32- species, while Lewis acid sites adsorbed phenol to facilitate the dissociation of the Ophenol-H bond, synergistically generating DPC. This study demonstrates synergistic catalysis using oxygen vacancies and Lewis acid sites, opening a novel avenue for DPC synthesis.

A diverse suite of Zn-SAPO-34 catalysts was synthesized employing three distinct methodologies for the incorporation of zinc species: thermal ion exchange, wet impregnation, and physical mixing. The catalysts were characterized using various analytical techniques including XRD, FT-IR, BET, SEM, XRF, XPS, NH3-TPD, and Py-IR, to elucidate the crystal structure, morphology, surface acidity, and the presence of zinc species within the catalysts. The study showed that the method of zinc introduction markedly impacts the physicochemical properties of the catalysts. Different approaches to introducing zinc species significantly influence the acid strength and type on the catalyst surface, with variations in the existing states of zinc across the catalysts. Specifically, zinc species introduced via thermal ion exchange coexist as ZnOH+ and ZnO within the catalyst, whereas those from wet impregnation and physical mixing are individually present as either ZnOH+ or ZnO. Furthermore, the study examined the catalytic performance of these Zn-SAPO-34 catalysts in the dehydration of fructose to produce 5-hydroxymethylfurfural (HMF). Catalysts prepared via thermal ion exchange exhinited superior performance, achieving an remarkable HMF yield of 94.6%. Additionally, in situ infrared technology was used to investigate the effect of zinc species introduction on the fructose dehydration process, indicating suggesting that the introduction of zinc species enhances the transformation of fructose molecules.

Nanosized hierarchical zeolites, combining the advantages of both nanoscale crystal and hierarchical pore structure, exhibited superior catalytic performance due to their shorter diffusion paths, reduced mass resistance, and more accessible active sites. Here, different from the traditional synthesis methods that create nanocrystals by using crystal growth modifiers, inhibitors, and/or zeolite seeds, we report a sustainable and simple method, characterized by kinetically modulated crystallization, for synthesizing nanosized hierarchical mordenite (HR-MOR) from quasi-solid-phase activated kaolin (QSP-kaolin) and thermally activated diatomite (TAD). Benefiting from the self-assembled nucleation-inducing property of QSP-kaolin and the progressive dissolution characteristics of TAD, a nanorod-assembled HR-MOR was synthesized neither using any Al- and Si-containing chemical reagents nor involving any growth modifier and organic structure-directing agents (OSDAs). Compared to conventional mordenite, the HR-MOR has a larger external surface area, enhanced acid site accessibility, and framework Fe species, which endows it with the superior catalytic performance in benzylation reaction of benzene with benzyl alcohol. Our work provides a sustainable and low-cost alternative for the direct synthesis of nanosized zeolites, entirely eliminating the need for Al- and Si-based chemical reagents, zeolite seeds, growth modifiers, and OSDAs.

Hydrogen is a critical renewable energy source in the energy transition.However,water electrolysis,which is the primary technique for achieving large-scale and low-carbon hydrogen production,still suffers from high pro-duction costs and energy consumption.The key is to develop highly efficient electrochemical water splitting catalysts.In recent years,the preparation of electrocatalysts via plasma treatment has gained recognition for its rapid,eco-friendly,and controllable properties,especially in the optimization of nano-microstructure.This review comprehensively summarizes the impact of plasma treatment on the nano-microstructure of water electrolysis catalysts,encompassing dispersion enhancement,morphology modulation,surface functionalization,defect construction,and element doping.These impacts on the nano-microstructure increase the surface area,modify the pore structure,introduce active sites,and regulate the electronic environment,thereby promoting the water splitting performance of electrocatalysts.Finally,the remaining challenges and potential opportunities are dis-cussed for the future development of plasma treatment.This review would be a valuable reference for plasma-assisted electrocatalyst synthesis and mechanism understanding in plasma impact on nano-microstructure.

Selective separation of aromatics and alkanes is of great significance for molecular refining and meeting the consumption gap of aromatics. Liquid-liquid extraction (LLE) stands out for its favorable operating conditions and low energy demand among various separation methods. Extraction solvent is the key of LLE process. In this research, ionic liquids (ILs) were used as solvents for the separation of aromatics and alkanes, and the effect of anions and cations of ILs was explored using the distribution coefficient (Daromatics), extraction selectivity (Saromatics) and extraction performance index (PI) as evaluation indexes. The separation effect of single metal IL [Emim]Cl-1.0AlCl3 was significantly better than that of organic solvent sulfolane, and its Do-xylene, So-xylene and PI were 0.35, 51 and 18, respectively. To further improve the separation effect, the transition metal salt was added to synthesize bimetallic ILs, the content of transition metal salt was increased, the extraction effect was improved. [Emim]Cl-2.0AlCl3-0.65AgCl was selected, and its Do-xylene, So-xylene and PI were 1.01, 81 and 82, respectively. The extraction conditions were optimized, with temperature of 20 degrees C and the mass ratio of solvent to oil (S/O ratio) of 4. Under these conditions, Do-xylene, So-xylene and PI of [Emim]Cl-2.0AlCl3-0.65AgCl could reach 1.74, 313 and 545, respectively. [Emim]Cl-2.0AlCl3-0.65AgCl could be recovered by vacuum distillation and exhibited excellent separation performance after reusing 6 times. The separation mechanism of aromatics by different solvents was explored by quantum chemistry simulation. For [Emim][AlCl4], imidazole cation [Emim]+ exhibited a stronger interaction with o-xylene and played a leading role in the selective separation of aromatics. For [Emim][AgAlCl5], there was pi-complexation between bimetallic anions and o-xylene, and the anions and cations cooperated to promote the separation of aromatics and alkanes.

Mesophase pitch is a crucial compound platform for the production of various advanced carbon materials, with its quality significantly influenced by the composition and structure of precursor materials. Here, we present a novel method for preparing naphthalene oligomers (NOs), which serve as precursors for the preparation of mesophase pitch (MP) via naphthalene polymerization catalyzed by chloroaluminate ionic liquids (Al-ILs). Different from those obtained via AlCl3-catalyzed method, the NOs synthesized by Al-ILs possess a narrow molecular weight distribution (MWD, 200-600 Da) and a well-defined molecular composition (di-, tri-, and tetra- polymers of naphthalene). When the prepared NOs were used as precursors, the resulting MP exhibited a shorter polycondensation time (4 h), higher yield (68%), lower ash content (0.005%), more concentrated MWD, and easier carbonization. These improvements are attributed to the tunable structure and acidity of Al-ILs, which facilitate naphthalene polymerization at low reaction temperatures and appropriate acidity, thereby improving its controllability. This work provides a flexible and efficient pathway for the custom production of NOs that potentially enable broader industrial applications of MP.

The separation of olefins and alkanes is beneficial for resource utilization of oil products, and liquid-liquid extraction is an important method of liquid-phase olefin/alkane separation. This study investigated the feasibility of bimetallic ionic liquids for the extraction of olefin from liquid-phase olefin/alkane mixtures using 1-hexene/n-hexane as a model hydrocarbon mixture. The bimetallic ionic liquids were first synthesized from different metal chlorides (ZnCl2, SnCl2, AlCl3, FeCl3) and CuCl with triethylamine hydrochloride. This newly prepared Fe-Cu bimetallic ionic liquid [Et3NH]Cl-0.47FeCl3-0.8CuCl had a good extraction performance, and the extraction selectivity could reach up to 8.41, which was about 4 times that of the organic solvent such as N-formylmorpholine and γ-butyrolactone used in the industry. The liquid-liquid equilibrium (LLE) of 1-hexene/n-hexane and Fe-Cu bimetallic ionic liquid system was investigated under different extraction temperatures, extraction times, and mass ratios of extractant to feed. Through 5 recycling experiments, the extraction selectivity decreased by less than 2%, and the characteristic peaks of the recovered bimetallic ionic liquids were unchanged by IR analysis, which proved that the bimetallic ionic liquid had excellent reversibility. Furthermore, the mechanism of 1-hexene extraction was investigated by quantum chemistry calculation and Raman spectroscopy, and there was π-complexation between Cu+ and 1-hexene. Then, the charge density of Cu+ in bimetallic ionic liquids was larger than that of cuprous-based ionic liquids. The results revealed that the addition of FeCl3 could activate Cu+ and weaken the Cu-Cl bond, enhancing the ability of the bimetallic ionic liquid to extract 1-hexene. Therefore, [Et3NH]Cl-0.47FeCl3-0.8CuCl was a good potential extractant during the efficient extraction of 1-hexene.

The development of highly efficient and innovative electrocatalysts is crucial for the commercialization of the hydrogen evolution reaction (HER) at high current densities. An electrocatalyst consisting of Pd nanoparticles electrodeposited on nickel foam (NF) treated with ferric chloride etching, yielding a Pd content of 0.53 wt%, was synthesized. This PdFe/NF-24 h catalyst demonstrated outstanding HER performance across a wide pH range, requiring overpotentials of only 302 mV, 96.4 mV and 637.9 mV to achieve a current density of 1000 mA/cm2 in 1 M KOH, 0.5 M H2SO4 and 1 M Phosphate Buffer Saline (PBS) electrolytes, respectively. The ferric chloride etching increased the active surface area, while iron doping optimized the hydrogen adsorption free energy on Pd. Furthermore, the presence of metal hydroxides facilitated the dissociation of water into adsorbed hydrogen, which then bound to active sites on the Pd surface to produce hydrogen, thereby enhancing the efficiency of hydrogen production. The catalyst operated at 1000 mA/cm2 in 1 M KOH solution for 222 h without degradation; it maintained stability for 124 h in 30 % KOH solution; in 0.5 M H2SO4 solution, it retained 99.6 % performance for 77 h and it remained stable for 230 h in 1 M PBS solution.

Platinum nanoparticles (Pt NPs) embedded in the multi-hollow silicalite-1 zeolite (Pt@MH-S-1) were prepared by the sequential alkali etching and recrystallization of parent microporous silicalite-1 zeolite. Then, toluene and acetone were employed as probe molecules to determine the catalytic behavior of Pt@MH-S-1 for the elimination of volatile organic compounds (VOCs). The results reveal that Pt@MH-S-1 with multi-hollow structure owns large external specific surface area for dispersing the Pt NPs, and abundant mesoporous channels for improving the accessibility of toluene to Pt NPs as well as high reactive oxygen content, excellent toluene adsorption capacity and moderate adsorption strength. Owing to these characteristics, Pt@MH-S-1 exhibits superior performance both in toluene and acetone catalytic oxidations as reflected by 100% conversion acquired at even a low temperature of 137 and 180 degrees C, respectively. Moreover, Pt@MH-S-1 also shows good stability toward the various conditions, signifying its superiority and potential in practical application for VOCs treatment.

Conversion of ethanol to high-value alcohols is an attractive approach for developing renewable biofuels, the key is to develop stable and high-efficient catalysts. In this work, based on the preparation strategy of heteroatomic Beta zeolites, a bifunctional Pt-Y/Beta catalyst was prepared by solid-state ion exchange and impregnation. Through characterization techniques such as TEM, NMR and XAS, it was confirmed that the Y species were incorporated into the framework of Beta zeolite by interacting with the silanol groups located at the defect sites, while the Pt species were confirmed to be present on the surface of the zeolite in the form of dispersed nanoparticles. The unique structure form and the favorable spatial proximity of the two metallic active sites lead to a synergistic catalysis, which enable a one-step conversion of ethanol to n-butanol with exceptionally high selectivity of 68 %. In situ DRIFT characterization, ethanol-TPD and relay experiment results show that in the ethanol to n-butanol reaction, the Pt species in Pt-Y/Beta catalyst serves as the active center for the dehydrogenation of ethanol and the hydrogenation of crotonaldehyde and crotyl alcohol, while the Y species is responsible for catalyzing the condensation reaction of acetaldehyde.

The separation of aromatic hydrocarbons from straight-run naphtha is crucial for the optimal utilization of naphtha resources in the petrochemical industry. Bimetallic halides exhibit excellent performance in aromatic separation from straight-run naphtha. Therefore, it is highly significant to investigate the complexation mechanism and aromatic separation mechanism for bimetallic halide selection and further separation performance enhancement. In this study, CuAlCl4 and Sn(AlCl4)(2 )were used in the separation of aromatics from naphtha and exhibited excellent performance. The complexation mechanism of bimetallic halide-aromatic complexes was elucidated by XAFS, FT-IR, and density functional theory. The results unveiled that bimetallic halides could coordinate with only one aromatic ring. The geometric structures, bonding characteristics, and weak interaction between bimetallic halides and hydrocarbons were analyzed by a series of wavefunction analysis methods. The results indicated that there was pi complexation between bimetallic halides and aromatics, in which s and d orbitals of Cu(I) ion and s and p orbitals of Sn(II) ion played an important role. Meanwhile, there was weak hydrogen bonding interaction between bimetallic halides and aliphatic hydrocarbons. The directional complexation between bimetallic halides and aromatics was the essential reason for aromatic separation.

Protic ionic liquids (PILs) are emerging as a new class of sustainable and efficient solvents for CO2 capture, requiring a fundamental understanding of their properties for their optimal design. To obtain a molecular-level understanding of the mechanism behind CO2 absorption in this class of absorbents, we selected four novel and high-efficient PILs prepared from superbase 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and 1,5-diazabicyclo[4.3.0]-5-nonene (DBN) as cations, with imidazole (Im) and pyrazole (Pyr) as anions. Density functional theory (DFT) and molecular dynamics (MD) simulations were used to quantify their interactions and reaction mechanisms as well as the dynamics of the CO2 absorption process. Results indicate that CO2 primarily interacts with the anions of PILs through van der Waals forces, while the cations and anions of PILs mainly engage in strong hydrogen-bonding interactions. Additionally, the anions primarily serve as the absorption reaction sites for CO2, with their molecule centers of mass being the closest. Meanwhile, reaction with CO2 requires overcoming a relatively low energy barrier (i.e., similar to 35-40 kJmol(-1)), making them more favorable for regeneration than benchmark solvents. Notably, MD simulations have also shown that CO2 molecules are preferentially accumulating at the gas/PILs interfaces and that chemisorption is leading the CO2 capture at low pressures in these PILs. Among the studied systems [DBUH][Pyr] is the most reacting system with CO2, while [DBUH][Pyr] shows the lower regeneration energy. The findings would shed more light on understanding and designing PILs for CO2 capture.

The electrooxidation of 5-hydroxymethylfurfural (HMF) has emerged as a promising way to generate high-value-added products. However, evoking high-valence state NiOOH species as active sites to realize high current density remains a challenge. Herein, we report an efficient electrocatalyst for HMF electrooxidation based on phosphate anion intercalated layered double hydroxides (NiCo-Pi-LDHs). Onset potential at 1.16V vs. RHE and current density of 200mA/cm2 at 1.41V vs. RHE were realized. The intercalated phosphates act as proton transfer intermediates, facilitating the dehydrogenation of hydroxides to form oxyhydroxides while the protonated phosphate generated. The obtained oxyhydroxide oxidized HMF to 2,5-furandicarboxylic (FDCA) while cycling backward to hydroxide, accompanied by the cycle of protonated phosphate to phosphate. This novel strategy with dual-cycle of phosphate and nickel species can effectively evoke NiOOH species, thereby speeding up the reaction rate and having a great potential for biomass upgrading.

The formation mechanism and pathway of HMF from fructose dehydration were investigated using in -line FTIR monitoring and in -situ C-13 NMR in this study. The results of the infrared absorption spectrum obtained at different time intervals during the reaction process showed significant inconsistencies with the acyclic pathway. However, the in -situ NMR analysis revealed the direct observation of two intermediates, fructose furan and (4R5R)-4-hydroxy-5-hydroxymethyl-4,5-dihydrofuran-2-formaldehyde, providing direct evidence to support the cyclic carbocation pathway. This study also included theoretical analysis of the intermediates involved in the key steps of various reaction pathways using density functional theory (DFT) calculations. The key steps in the cyclic pathway were found to have lower activation energy compared to the acyclic pathway, while exhibiting significant differences in electronegativity at the reaction sites. The computational results not only reveal but also provide support for the rationality of the cyclic formation mechanism. The response surface methodology (RSM) was utilized to optimize the preparation process of HMF through fructose dehydration. It enabled determination of the significance order for each factor (reaction temperature > reaction time > mass percentage of water in the solvent) and identification of the optimal process conditions (reaction time of 3.5 h, reaction temperature of 143.5(degrees)C, mass percentage of water in the solvent of 5.0 %, and maximum yield of 5-HMF reaching 82.4 %).

Isobutane alkylation catalyzed by a composite ionic liquid is a new technology for the production of clean gasoline blending components. In this process, efficient effluent cooling plays a crucial role in energy conservation. A new cooling application by effluent (mainly isobutane) evaporation was proposed for this target, in which the effluent was released into a low-pressure environment to enhance and control the evaporation of isobutane. The transient temperature of isobutane droplets was measured by suspending them on the tip of a thermocouple while a high-speed camera recorded the evaporation process. The effects of final pressures, different initial droplet diameters, initial droplet temperatures, and gas concentrations of isobutane on evaporation behavior and droplet temperature were investigated. The results demonstrated that isobutane droplets underwent intense evaporation and stable evaporation phases. The evaporation rate constant (k0) exhibited a linear increase with decreasing final pressure and increasing initial droplet diameter. With the decrease in k0, the droplet evaporated in three states: expansion and breaking, only expanding but not disintegrating, and surface evaporation. The evaporation rate constant (k1) during the stable evaporation phase was influenced by the initial droplet diameter and the concentration gradient between the droplet and the environment due to the concentration difference around the droplet. The lower the final pressure, the lower the droplet temperature in the stable evaporation stage, and the droplet diameter and initial temperature did not appear to affect the droplet equilibrium temperature. Adjusting the final pressure allows for precise control of the temperature of the droplets during the stabilization phase of evaporation.

Ionic liquids (ILs) have shown huge potential advantages as solvents to absorb and recover dichloromethane (DCM) from waste gasses. The infinite dilution activity coefficient (γ∞) of DCM in ILs is an important parameter, which can be used to predict the vapor-liquid equilibrium of DCM-IL systems. In this work, a new model of calculating the γ∞ of DCM in ILs is established based on ionic fragments contribution (IFC) and gradient boosting regressor (GBR) algorithm. IFC is used to obtain the surface charge density distribution area of ILs (Sσ-profile) that is the input of GBR. GBR is used to learn the mapping relationship between input feature and γ∞ of DCM in ILs. The database of the γ∞ of DCM in ILs composed of 29 cations and 22 anions includes 72 experimental data and 421 COSMO calculation data, which was employed to establish the IFC-GBR model and predict the γ∞ of DCM in ILs. The coefficient of determination (R2) and mean absolute error (MAE) of the IFC-GBR model test set are 0.9703 and 0.0519, respectively. Also, this model has excellent generalization capability of predicting evidenced by high 10-fold cross-validation coefficients of determination in the range 0.9474–0.9481. These results indicate that the proposed model can accurately predict γ∞ of DCM in ILs, then provide the important data for developing a new process of absorbing and desorbing DCM by IL-based technologies.

Along with the energy revolution and the advent of the hydrogen produced by electric power,the raw materials and technology for ammonia synthesis are constantly changing. In the context of the revolution of the hydrogen energy industry, the ammonia synthesis industry using hydrogen from water electrolysis in China is not easily constrained by capacity, quota, feedstock and resources, resulting in constructing the largest industrial chain of water electrolysis production and utilization of hydrogen in China. Ammonia synthesis will also transition from traditional hydrogen production from fossil feedstocks to ammonia synthesis from water electrolysis. In addition to being used for the production of fertilizer,ammonia synthesized from green power water electrolysis is expected to replace heavy oil for ship fuel,and to be used for energy storage and peak regulation in coal power plants to replace coal collaborated with the reducing carbon for the production of urea. The application scenario for ammonia synthesis will also shift from traditional synthetic ammonia urea plants from fossil feedstocks to hydrogen production from photovoltaic or wind power plants to produce ammonia, and the capture of carbon dioxide from coal power plant flue gas could produce ammonia to generate renewable urea. Hydrogen production from water electrolysis in oil and gas fields to produce ammonia can realize coupled co-production of electricityhydrogen-ammonia above ground and oil and gas underground. Along with the changes and progress of hydrogen production from photovoltaic or wind power and ammonia synthesis technology, new challenges will be emerged, such as ammonia transportation, oxygen consumption by water electrolysis and steam consumption by ammonia synthesis.

Among the many resource utilization routes of CO2, the reaction of CO2 with epoxides to synthesis cyclic carbonates is a well-established method, which is not only environmentally friendly but also in line with atomic economy for heterogeneous catalysts. Aimed at insufficient exposure of active sites and poor catalytic activity, a series of P[VImX][Br] Poly(ionic liquid)s (PILs) catalysts was developed with different porous structure. PILs catalysts with hierarchical porous structure and particle size were obtained by adjusting the ratio of ILs and DVB monomer. When the ratio of ILs increased, the specific surface area and the degree of dispersion of the particles firstly increased and then decreased, and the larger specific surface area and the degree of dispersion were more favorable for the full exposure of the active sites, which in turn improved the catalytic activity. Among them, the optimal ratio of ILs is 0.4 (P[VIm0.4][Br]), which has relatively large specific surface area and high degree of dispersion, and the highest catalytic activity, and the conversion rate of propylene oxide (PO) reaches 95 %. In addition, the catalyst exhibited good recoverability after five cycles and obtained a wide substrate applicability. This paper provides a new idea for tuning the structure of PILs for high efficient catalysis.