In the present investigation, bi-metallic zeolitic imidazolate frameworks (BM-ZIF), consisting of 75% Co2+ and 25% Zn2+ ions, were synthesized at ambient temperature in an aqueous environment. The BET surface area, along with the CO2, N2, and CH4 uptake capabilities of BM-ZIF, was systematically assessed. Membranes based on Pebax-1657 were prepared by incorporating BM-ZIF particles into the polymer matrix, with filler content ranging from 5 to 25 wt% relative to the polymer. The dispersion of the inorganic filler within the membrane matrix, as well as the structural characteristics, physicochemical interfaces, and filler-polymer interactions, were characterized utilizing FESEM, FTIR, XRD, and DSC techniques. FESEM analysis substantiated the uniform dispersion of the filler throughout the membrane matrix. DSC results showed that crystallinity decreased progressively as the filler loading increased. The synthesized MMMs demonstrated enhanced gas adsorption characteristics relative to the Pebax membrane. Performance of the MMMs was assessed using a custom-designed experimental setup designed to test both pure gases and binary gas mixtures. For an optimal filler loading of 20 wt% BM-ZIF, a remarkable 122% increase in CO2 permeability, alongside 59% and 50% enhancements in CO2/N2 and CO2/CH4 selectivity, respectively, was achieved compared to the unmodified Pebax. In the case of a binary gas mixture, the membrane exhibited a CO2 permeability of 39.51 Barrer and CO2/CH4 separation factor of approximately 18.8. These findings elucidate the capability of bi-metallic ZIF fillers to augment the gas separation properties of MMMs, thereby presenting substantial advancements for applications in energy and environmental sectors.

Metal-organic frameworks (MOFs) hold great potential as materials for the separation of gas mixtures. To effectively use MOFs as an adsorbent for the dynamic separation of gas and liquid mixtures, they must be formulated and shaped into a mechanically stable bead or pellet form. This study focuses on the synthesis of MIL-53(Al)-FA in the form of beads and pellets. The MOF beads are produced using alginic acid as a binder and calcium chloride as a gelling agent, and pellets are formed through mechanical pressing. Different physicochemical techniques, such as powder X-ray diffraction, Fourier-transform infrared spectroscopy (FTIR), thermal gravimetric analysis, and scanning electron microscopy were used for the characterization of the synthesized beads and pellets form. The adsorption uptake capacity of CH4 and N2 gases was measured from 1 to 10 bar pressure at 298 and 313 K, respectively. The adsorption isotherm data for both adsorbates were evaluated by using the dual site Langmuir isotherm equations. Additionally, the adsorption selectivity of CH4 over N2 in a binary feed mixture was predicted using the ideal adsorbed solution theory. Breakthrough experiments were performed with beads and pellets as adsorbents using CH4/N2 feed mixtures (30:70 and 50:50 v/v). These experiments were conducted under various flow rates, pressures, and temperatures. The MIL-53(Al)-FA beads exhibited a comparable CH4/N2 selectivity (5.34) and a higher dynamic CH4 adsorption capacity (1 mmol/g) compared to those of the pellets, which showed a selectivity of 5.74 and a dynamic CH4 capacity of 0.71 mmol/g under the same conditions. The higher CH4/N2 selectivity in the pellet form was mainly due to the higher ratio of coadsorption of CH4 and N2. The lower length of the unused bed in the case of beads (7.30 cm) leads to a higher CH4 dynamic capacity than that of the pellet form (13.30 cm).

Mixed matrix membranes (MMMs) are highly recognized owing to their efficient CO2 extraction from various industrial gas mixtures. A composite material made of SBA-15 and MOF-199 was synthesized and subsequently integrated into a PEBA polymer matrix. Membrane characterization results obtained from SEM, FTIR, XRD, and TGA indicate good compatibility between PEBA-1657 and the MOF-199@SBA-15 filler, suggesting effective incorporation of the filler within the polymer matrix. 5 wt% MOF-199@SBA-15/PEBA unveiled permeability of 67.11, 1.24, 1.74, and 4.23 Barrer for CO2, N-2, CH4, and H-2, respectively, and selectivity of 103.48, 38.36, and 17.12 for CO2/N-2, CO2/CH4, and CO2/H-2, respectively. Compared to the pristine membrane, the composite membrane exhibits 66%, 39%, and 63% higher CO2/N-2, CO2/CH4, and CO2/H-2 selectivity. In comparison with 5 wt% MOF-199/PEBA and 5 wt% SBA-15/PEBA membranes, 5 wt% MOF-199@SBA-15/PEBA exhibits fourfold higher CO2/N-2 selectivity. Further, the optimized MMM was evaluated for the CO2:CH4 (vol%) binary mixtures of 3:97, 45:55, and 85:15, which show an increase in CO2 permeability with the increase in CO2 concentration in the feed mixture. These results revealed that the prepared composite MOF-199@SBA-15 filler substantially impacted the performance of MMM for CO2 removal from biogas and power plant off-gases.

Due to their diverse structure, high porosity, and tunable functionality, Metal-Organic Frameworks (MOFs) hold great potential as materials for diverse applications, including gas separation. Material science researchers are focusing on creating flexible materials that have special properties. Most of the latest research mainly concentrates on fabricating composite materials of MOFs and other functional materials. These MOF-based composites can mitigate the limitations of pure MOFs and may even perform better than the individual components. Here, we present a systematic study on the effect of solvent in synthesising a composite (Cu-BTC@SBA-15) of Cutrimesate MOF (aka CuBTC) and ordered mesoporous silica SBA-15, showing considerable improvement in selectivity for CO2 adsorption from the flue gas and biogas. The pristine Cu-BTC, SBA-15 and the composites with different content of Cu-BTC were characterized by PXRD, BET, FT-IR, SEM, TEM and TGA techniques. The pure gas adsorption isotherms were measured for CO2, CH4, and N2 gases. Ideal Adsorbed Solution Theory (IAST) is used for the binary selectivity calculations for gas systems such as CO2/CH4 and CO2/N2 in the context of biogas and flue gas separation. The composite exhibited an increase in CO2/CH4 selectivity by 39 % compared to pure Cu-BTC and 85 % compared to pure SBA-15. For the CO2/N2 system, the composite showed 38 % higher selectivity than Cu-BTC. The work has significance in the design of effective MOF-based composites for CO2 separation. Our work might open up a new route to design multifunctional materials for worldwide applications through an adsorptive and or mixed matrix membrane route.

Metal-organic frameworks (MOF) are promising materials for gas storage and separation. The formulation and shaping of MOFs in mechanically stable bead forms is an essential requirement for their practical application as an adsorbent for gas and liquid mixture separations. In this work, MIL-53-Al and MIL-101 MOF beads are synthesized using sodium alginate as a binder, and calcium chloride as a gelling agent. The synthesized MIL-53-Al and MIL-101 MOF beads are characterized by powder X-ray diffraction (PXRD), BET surface area, porosity analysis from N2 uptake data at 77 K, FTIR, TGA, and scanning electron microscopy (SEM). The isothermal equilibrium adsorption uptake of CH4 and N2 gases is measured up to 10 bar pressure while the CO2 equilibrium uptake is measured up to 1 bar at 298 and 313 K respectively. The isotherm data of all adsorbates are fitted in Dual Site Langmuir (DSL) isotherm equations. The adsorption selectivity for CH4/N2, CO2/CH4, and CO2/N2 binary systems are predicted using the Ideal Adsorbed Solution Theory (IAST) method. The dynamic column breakthrough experiments are carried out on MIL-53-Al beads for CH4/N2 (30:70 and 50:50 v/v), CO2/CH4 (45:55 v/v) and CO2/N2 (15: 85 v/v) feed mixtures. The IAST selectivity and breakthrough time obtained under the same superficial velocity, pressure, and temperature conditions follow the order CO2/N2 > CO2 /CH4 > CH4/N2. The MIL-53-Al beads show higher CH4/N2, CO2/CH4, and CO2/N2 selectivity for the targeted mixtures than MIL-101 beads.

This study highlights the utilization of biobased material for developing high-performance membranes for gas separation applications. Biochar was synthesized by the pyrolysis of pine needles and further modified by silane functionalization. Thus obtained biochar was incorporated into a rubbery polymer, poly(ether-blockamide) (Pebax-1657), to synthesize mixed matrix membranes (MMMs). Morphologies of membranes and physio-chemical interactions of the biochar and polymer were evaluated using SEM, FTIR, DSC, and XRD. MMMs exhibit higher gas adsorption properties compared to the neat Pebax-1657 membrane. The effect of biochar incorporation on gas permeation properties was conducted in an indigenously designed setup using pure CH4, CO2, and N2 gases in the pressure range of 5 to 30kg/cm2. 20wt.% Biochar loaded MMM achieved a higher CO2 permeability of 114 Barrer, signifying 79% higher permeability over the pristine Pebax membrane. Correspondingly, the highest selectivity values for CO2/CH4 and CO2/N2 achieved were 32 and 94, respectively, with increasing pressure. A regression model was developed to estimate the relation between biochar loading and gas permeability. The data revealed a strong positive correlation (0.7-0.9) between gas permeability and the percentage of biochar loaded. The developed MMMs are stable and exhibit superior performance for CO2 removal from natural gas and power plant off-gases. Pine needles derived MMMs represent a promising new approach for developing high-performance and environmentally sustainable membranes for gas separation applications.

The work reported herein describes the synthesis of a 3D material UiO-66(Zr)-NH-OC-MWCNT by combining a synthesized metal–organic framework UiO-66(Zr)-NH2 and a carboxy functionalized multi-walled carbon nanotube MWCNT-COOH via an amide linkage and demonstrated its application for simultaneous electrochemical determination of two benzimidazole fungicides-carbendazim and thiabendazole. Different analytical techniques like Fourier transform infrared spectroscopy, X-ray diffraction analysis, Brunauer–Emmett–Teller analysis, and Field emission scanning electron microscopy were employed to characterize all the synthesized materials. The electrochemical characterization of the fabricated electrode was carried out using cyclic voltammetry and electrochemical impedance spectroscopy. Cyclic voltammetry and differential pulse voltammetry techniques have been used for the electroanalysis of carbendazim and thiabendazole. A limit of detection of 0.077 µM and 0.557 µM, respectively, have been obtained in the calibration range of 0.1 to 40 µM for carbendazim and 1 to 40 µM for thiabendazole, after optimization of several parameters which are susceptible to the sensitivity and selectivity of the developed sensor. Furthermore, with satisfactory results from the study of interferences, repeatability, and reproducibility, the proposed electrochemical sensor was successfully applied for analysis of carbendazim and thiabendazole in real samples.

The adsorptive separation process for CO2/CH4 and CH4/N2 gas separation has commercial potential, in biogas, Coalbed Methane process etc. although it remains to strive due to the absence of effective adsorbents. Zeolite NaY was used in this study due to its uniform pore structures, surface properties, and potential gas separation adsorbent. Zeolite NaY was modified by polyether polyols (PEPO) to get an adsorbent for selective separation of CO2/CH4 and CH4/N2 gas mixtures. The PXRD, FT-IR, GPC, 1H NMR, TEM, and surface area analysis were used to characterize the PEPO and PEPO-modified zeolite. The single component equilibrium adsorption desorption isotherms with PEPO modified NaY zeolites and NaY zeolite for CO2, CH4 and N2 were measured at 298, 313, and 328 K and up to 5 bar pressure. The isotherm data of CO2, CH4 and N2 were fitted in Dual Site Langmuir equations, and adsorption selectivity of CO2/CH4 and CH4/N2 gas mixtures was predicted using Ideal Adsorbed Solution Theory (IAST) method for 90:10, 50:50 (vol/vol) CH4/N2 and 80:20, 50:50 (vol/vol) CO2/CH4 feed gas mixtures representing coal bed methane gas composition and pressure conditions. The high surface area and hydroxyl groups in PEPO-modified NaY enhanced selectivity for CO2/CH4 and CH4/N2 gas separation. The selectivity predicted by the IAST method were 106.12 and 95.34 for 0.5 % PEPO-NaY (80:20 v/v and 50:50 v/v) for CO2/CH4 and 3.95 and 3.52 for 2 % PEPO-NaY (90:10 v/v and 50:50 v/v) for CH4/N2 at 298 K up to 5 bar respectively.

Rising emissions of greenhouse gases, such as CO2 and CH4, due to anthropogenic activities cause several adverse environmental impacts and encourage technological development for their effective capture and separation. The present work addresses a facile hydrothermal approach to impregnate K2CO3 and K2C2O4 into pomelo peels (fruit waste), followed by thermochemical activation for preparing activated carbons, i.e., PKC and PKOX, respectively, as adsorbents for biogas upgradation (CO2/CH4) and capture of greenhouse gases from flue gas (CO2/N2) and low concentration coalbed methane (CH4/N2). The high CO2 sorption capacity of PKC (4.67 mmol.g-1) and PKOX (3.96 mmol.g-1) at 298 K and 1 bar is attributed to their high surface area (1224-1371 m2.g-1), excellent microporosity, nitrogen-based functionalities, and turbostratic structural features. The ideal adsorbed solution theory (IAST) model is applied to estimate separation selectivity for binary gas mixtures, i.e., CO2/N2 (15:85), CO2/CH4 (45:55), and CH4/N2 (30:70) using PKC and PKOX adsorbents. The adsorption selectivity of PKC and PKOX for CO2/CH4 is found to be 143% and 296% higher compared to a widely used commercial activated carbon, signifying the potential of PKOX for biogas upgradation via adsorptive separation of CO2. The adsorption selectivity of PKC and PKOX for CO2/N2 is estimated to be 124% and 119% higher than commercial activated carbon, revealing the potential of both PKC and PKOX for capturing CO2 from flue gas to minimize its release in the atmosphere.

Metal-Organic Frameworks (MOF) are promising materials for gas separation and storage. The shaping of MOFs is an essential step for their practical industrial application. In this work, Cu-BTC MOF extrudates (B-5, B-10, and B-15) were prepared by using 5, 10, and 15 wt% of carboxymethyl cellulose as a binder and well characterized by powder X-ray diffraction (PXRD), N2 adsorption-desorption at 77 K, FTIR, TGA, and Scanning Electron Microscopy (SEM). The equilibrium adsorption isotherms of CH4 and N2 with Cu-BTC extrudates were measured at 298, 313, and 328 K and up to 10 bar pressure and compared with zeolite 13X and 5A. The isotherm data of both adsorbates were fitted in Dual Site Langmuir equations, and adsorption selectivity of methane over nitrogen was predicted using Ideal Adsorbed Solution Theory (IAST) method for 20:80, 30:70, and 50:50 (mol%/mol%) CH4/N2 feed gas mixtures representing nitrogen bearing coal bed methane. The CH4/N2 selectivity of Cu-BTC extrudates B-5, B-10, and B-15 was higher than commercial zeolite 13X and 5A. For example, for the 20:80 CH4/N2 feed mixture, the CH4/N2 selectivity of Cu-BTC extrudates B-5, B-10, and B-15 was 3.21, 3.24, and 3.25, respectively, which are about 38 & 34% higher than zeolite 13X and 5A which makes them potential adsorbent for further dynamic studies for the said separation application.

There has been a steady growth in research on porous materials such as metal-organic frameworks (MOFs) for their various applications. A significant drawback of conventional MOF synthesis is the use of toxic organic solvents to solubilize various organic linkers. Such an approach requires a longer MOF growth time and energy-intensive solvent recovery schemes during scale-up. In this work, we report the synthesis of Fe, Cu-based MOFs using trimesic acid (1,3,5-benzene tricarboxylic acid) as a linker via a facile aqueous medium route under environment-friendly conditions without requiring any toxic organic solvent and temperature. NaOH was used as a stoichiometric deprotonating agent for the aromatic carboxylic acid groups in the linker to facilitate linker solubility and interaction with metal ions. The aqueous medium-synthesized MOFs showed improved gas sorption characteristics compared with the same materials synthesized under the conventional solvent-mediated route. The synthesized MOFs were characterized by Brunauer-Emmett-Teller, powder X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, Fourier transform infrared, and X-ray photoelectron spectroscopy, and isotherms were measured for different gases (CO2, CH4, N-2, propylene, and propane). Ideal adsorbed solution theory was used for binary selectivity calculations for gas systems such as CO2/CH4, CH4/N-2, CO2/N-2, C3H6/N-2, and C3H6/C3H8. Density functional theory calculation was made to get an insight into the adsorptive behavior of the different gas molecules on the MOFs as adsorbent.

In the present investigation, an isoreticular series of Al-based metal-organic frameworks (MOFs) with MIL-53 topology namely, MIL-53(Al)-FA, MIL-53(Al)-BDC, MIL-53(Al)-NDC and MIL-53(Al)-BPDC formed by organic linkers with different molecular size and correlated porosity were examined for their adsorption capacity for C3H8, C3H6, C2H4, and CH4, and C3H8/CH4, C3H6/CH4, C2H4/CH4 separation selectivity. C3H8 and C3H6 adsorption is found to be sensitive to van der Waals forces and increases with increasing micropore volume of the MOFs. Ideal Adsorption Solution Theory (IAST) has been applied to estimate binary C3H8/CH4, C3H6/CH4 (C-3/C-1), and C2H4/CH4 (C-2/C-1) selectivity. The MOFs investigated have shown high C-3/C-1 selectivity with MIL-53(Al)-FA exhibiting exceptional C3H8/CH4 and C3H6/CH4 selectivity of 330 and 246, respectively, for the 5 : 95 (v/v) mixtures. MIL-53(Al)-FA also exhibited the highest C-2/C-1 selectivity among them. The high affinity of MIL-53 Al-based MOFs for C-3 and C-2 hydrocarbons over C-1 make them suitable as adsorbents for methane purification.

A DNOC electrochemical sensor has been developed by using a composite of Zr-UiO-66 and FMWCNTs on a glassy carbon electrode (GCE) and using the differential pulse voltammetry technique. The synthesized materials were physico-chemically characterized by BET, PXRD, FTIR, TGA, EDX, and FESEM. Cyclic voltammetry showed that DNOC has three oxidation peaks at 0.03 V (RSD: 0.23%), 0.42 V (RSD: 0.21%), and 1.32 V (RSD: 0.32%) and three reduction peaks at - 0.20 V (RSD: 0.15%), - 0.82 V (RSD: 0.26%), and - 1.14 V (RSD: 0.19%) which follow a diffusion-controlled mechanism. Different parameters were optimized using differential pulse voltammetry and good linear ranges were found for the simultaneous detection of the three reduction peaks. For a specific concentration range of 0.1-50 μM, a limit of detection of 0.119 μM based on 3Sb/m was obtained. The interfering effects of five non-phenolic pesticides and five heavy metals were evaluated to highlight the selectivity of the developed sensor. It is the first report of an electrochemical DNOC sensor in which all three oxidation peaks are prominently visible. Ethion and chloropyriphos were found to inhibit the redox process of DNOC on the developed sensor platform Zr-UiO-66/FMWCNT/GCE. The sensor was successfully applied to DNOC determination in spiked potato samples and the results showed a standard deviation of less than 3%. The proposed method is expected to provide a novel platform for the quantitative determination of DNOC pesticides in vegetables.

Efficient CO2/CH4 separation is an important topic for the energy sector because of its implication in the economic upgradation of natural gas and biogas. Due to their excellent stability and high porosity, Zr-based MOFs are the best adsorbent candidates for targeted industrial applications through the adsorptive separation route. Herein, we report a scalable process for the synthesis of MOF-808(Zr) and DUT-67(Zr) analogues in aqueous solutions using zirconyl nitrate as a metal precursor and evaluate them as an adsorbent for CO2/CH4 separation. The as-synthesized materials were thoroughly characterized to verify the phase formation of the desired MOFs. They show similar porosity and stability to that obtained from conventional metal sources. Notably, at 298 K, the CO2 sorption analysis of MOF-808@N shows a relatively high uptake of 5.6 mmol/g at 10 bar. The CO2/CH4 selectivity in the same conditions for a 50:50 v/v binary mixture is 9.2, higher than that of well-known reported MOF adsorbents. The excellent separation performance was attributed to the large micropore volume and defect sites in the MOF framework. This study suggests that zirconyl nitrate could be an effective metal salt precursor for synthesizing Zr-MOFs for natural gas and biogas upgrading.

Synthesis of biobased membranes for gas separation applications. The Pebax® Rnew® 30R51 membrane holds potential for CO 2 separation. Increasing the polymer concentration enhanced the gas selectivity to 91 and 26 for CO 2 /N 2 and CO 2 /CH 4 , respectively.

A five-step, two-column Vacuum Swing Adsorption (VSA) process has been demonstrated for hydrogen and carbon dioxide recovery from a simulated gas stream representing tail gas of polybed hydrogen PSA. An adsorber with a layered bed configuration consisting of commercial activated carbon and zeolite 13x has been used in the process. The VSA operates at 2 bar(a) adsorption pressure and 0.1 bar(a) regeneration pressure thus maintaining a P-H/P-L ratio of 20. By operating at shorter adsorption time, H-2 can be enriched from 25 mol% level in the tail gas to 99 mol% level at a recovery of around 80 mol%. At higher CO2 loading of the bed obtained by operating at larger adsorption time, it is also possible to obtain sequestration grade CO2 (> 95 mol% purity) with at least 90 mol% recovery from the evacuation step of the VSA. The average H-2 purity obtained in the latter scenario is similar to 85 mol% level which can be recycled to the feed header of the main poly bed H-2 PSA after necessary compression. Recycling of recovered H-2 can lead to an increase in the overall productivity of the poly bed PSA unit for pure hydrogen production in a refinery. A possible location for the integration of the VSA process with the overall H-2 production scheme in a petroleum refinery and its impact in reducing CO2 footprint for the H-2 production has been discussed.

Performance of a two column five-step vacuum swing adsorption cycle is tested for CO2 enrichment and recovery from a simulated ternary flue gas mixture containing 13% CO2, 82% N-2, and balance O-2. The results are compared when a layered bed of commercial activated carbon (AC) (F-400, Calgon) and 13X zeolite (Z10-04, Zeochem) is employed with reference to an only single layer of AC and 13X adsorbent. With the layered bed, in which the first layer at the feed entry end is AC followed by 13X, the CO2 recovery obtained is 84% which is 42% more than that of pure 13X bed and the purity of CO2 is almost at the same level as that with 13X bed (similar to 90 mol %). The VSA is compared at same adsorption time, set as a 70% of CO2 breakthrough time. The CO2 purity obtained with the activated carbon bed was 76 mol% which is considerably lower compared to the bed with only zeolite 13X layer (90 mol%). The result can be explained due to higher CO2/N-2 selectivity of the zeolite than activated carbon. The recovery of CO2 with activated carbon is, however, higher (97%) than zeolite (59%) due to its lower heat of CO2 adsorption compared to that with 13X. The lower heat of CO2 adsorption on the activated carbon surface implies weaker interaction and thus better desorption characteristics than 13X. VSA performance of the layered bed are also compared under different adsorption/evacuation time, bed temperature and evacuation level.

Increased CO2 concentration in the earth's atmosphere results in global warming and has increased concerns towards the development of efficient strategies for carbon capture and storage. CO2 separation from flue gas is one of the most challenging areas. Here, a Cu-BTC MOF and a series of polyethyleneimine (PEI) incorporated Cu-BTC composites (Cu-BTC-PEI) with different loading amounts of PEI have been developed for CO2 separation. A significant increase in CO2 adsorption capacity was observed with Cu-BTC-PEI adsorbents. Detailed characterization of the developed adsorbents was done using XRD, SEM, BET surface area and IR. The synthesized adsorbents show good CO2/N-2 selectivity for a designed flue gas composition containing 15 vol% CO2 and the remainder as N-2. 2.5 wt% PEI loaded Cu-BTC (Cu-BTC-PEI-2.5) has shown a CO2 adsorption capacity of 0.83 mmol g(-1) at a pressure of 0.15 bar and 25 degrees C which is almost double that of Cu-BTC in similar conditions. But at an elevated pressure of 5 bar and 25 degrees C, 1 wt% PEI loaded Cu-BTC (Cu-BTC-PEI-1) performed even better with a CO2 adsorption capacity of 10.57 mmol g(-1). Better adsorption capacity and selectivity for CO2 was obtained with Cu-BTC-PEI composites and they are good aspirant adsorbents for CO2 separation from flue gas.

Adsorption equilibrium isotherms of propane (C3H8) and propylene (C3H6) on commercial zeolite 5A (UOP), zeolite 13X (Z10-04, Zeochem), and laboratory synthesized titanosilicate Na-ETS-10 were measured using a gravimetric microbalance at 298, 323, 343, 373, and 423 K and over 0 to 300 kPa. The isotherm data were fitted to different isotherm models. A Microsoft Excel based code for solving Ideal Adsorbed Solution Theory (IAST) was validated against literature reported multicomponent isotherm data. The binary adsorption selectivity of propylene over propane was predicted with this LAST solver for two feed compositions, namely, equimolar propane/propylene mixture and 85 mol % propylene with balance propane representing steam cracker and fluid catalytic cracker (FCC) off gas, respectively. High selectivity values in excess of 25 are obtained for Z10-04. Propylene to propane selectivity for Z10-04 and Na-ETS-10 decreases with an increase in temperature, and for zeolite 5A (UOP) the selectivity improves with an increase in temperature.