The oxidative dehydrogenation of propane with CO2 (CO2-ODHP) technology is recognized as a promising new route for propylene production, owing to its advantages in energy saving, high yield, and environmental friendliness. However, the inherent complexity of the reaction system and catalyst structures has led to ongoing debates regarding its activation mechanisms and reaction pathways. Thus, the development of high-performance catalysts capable of synergistic activation of propane and CO2 with simultaneous high propylene selectivity continues to be a key objective and challenge. This study aimed to investigate the catalytic activity of Pt-based catalysts supported on CeOx nanoclusters for the CO2-ODHP reaction, from the perspective of enhancing CO2 adsorption and activation. Experimental results demonstrate that the oxygen-rich defect structure on the CeOx nanoclusters significantly promotes the activation and dissociation of CO2. Furthermore, the incorporation of Sn effectively enhances the dispersion of Pt species and their surface electron density, thereby further strengthening the strong adsorption and activation of propane while simultaneously facilitating the desorption of propylene. Following continuous operation for 5 h at 550 degrees C, the 0.5Pt2.0Sn/CeOx-SiO2 catalyst demonstrated superior catalytic performance, achieving a propane conversion of 45.3% and a propylene selectivity of 93.6%. Based on in situ DRIFTS analysis, a possible reaction mechanism for CO2-ODHP on this catalyst is proposed. The findings of this study provide crucial theoretical guidance and practical references to further advance high-performance Pt-based catalysts for CO2-ODHP reactions.

To solve the problem of liquid-phase synthesis of nano-ZnO, a photocatalytic performance study was proposed. In this study, the microwave homogeneous precipitation method was used to add different types and amounts of surfactants. The synthesis of nano-zinc oxide was controlled by changing the reaction system conditions. The photocatalytic properties of nano-zinc oxide for degrading three water-soluble dyes were preliminarily studied and discussed. The results show that the photocatalytic performance of nano-ZnO is closely related to its size, morphology, specific surface area, and even crystallographic direction.

Cerium-modified Cu-SSZ-13 catalysts were prepared by an aqueous ion-exchange method, and Ce and Cu were incorporated through different ion-exchange sequences. The results of NH3-SCR activity evaluations displayed that Cu1(CeCu)2 catalyst presented excellent catalytic activity, and over 90% NOx conversion was obtained across the temperature range of 200–500 °C. The characterization results showed that the ion-exchange sequence of Cu and Ce species influenced the crystallinity of the zeolites and the coordination of Al. A small amount of Ce could participate in the reduction process and change the location and coordination environment of copper ions. Furthermore, Ce-modified Cu-SSZ-13 catalysts possessed more acidic sites due to their containing replacement of Ce and movement of Cu in the preparation process. The cooperation of strong redox abilities and NH3 storage capacity led to the increase of active adsorbed species adsorption and resulted in better activity of Cu1(CeCu)2.

A series of CeO2-WO3/SiO2-TiO2 (CeWxTiSiy) catalysts with different loading amounts of WO3 were synthesized by wet co-impregnation of ammonium metatungstate and cerium nitrate on a SiO2-TiO2 support, and were employed for the selective catalytic reduction (SCR) of NO by NH3. The catalytic activity of the CeO2/SiO2-TiO2 (CeSiTi) catalyst was enhanced by the addition of WO3, and the W-containing catalysts showed higher hydrothermal stability especially between 550 and 600 degrees C. The introduction of WO3 to the CeSiTi catalyst could produce more chemisorbed oxygen species, reducible subsurface oxygen species, acid sites and ad-NOx species. Moreover, the modification of CeO2-WO3/TiO2 (CeWTi) by SiO2 could enhance the specific surface area, especially the aged specific surface area, thus improving the hydrothermal stability of the catalyst.

Cu-SSZ-13 has been generally considered as the predominant commercial selective catalytic reduction (SCR) catalyst in the NH3-SCR reaction because of its superior activity and durability. However, in real applications, SCR catalysts readily undergo hydrothermal aging and sulfur poisoning. In this work, the deactivation and regeneration of a commercial Cu-SSZ-13 catalyst was investigated for SO2 exposures during hydrothermal aging and the effect of different regeneration temperatures was compared. By using XRD, SEM, H2-temperature programmed reduction (TPR), X–ray photoelectron spectra (XPS) and NH3-temperature programmed desorption (TPD) analysis, it was found that SO2 poisoning influenced the chabazite (CHA) structure even if regeneration cannot restore its original structure, the redox ability and ammonia storage performance also influenced by sulfation and the regeneration process. Moreover, the extent of a decrease in redox ability was more severe than acidity, suggesting that the amount of isolated Cu2+ and Cu+ reduction was responsible for irreversible deactivation over the Cu-SSZ-13 catalyst. Combined with the analysis of Ea values and pre-exponential factor of the SCR reaction, a more likely explanation for the irreversible deactivation was that active sites were lost mostly in sulfated and regenerated process sites.

A new efficient pathway for synthesis of 1-benzy1-5-aryl-1,2,3-triazoles by regioselective direct arylation between 1-benzyl-1,2,3-triazole and Ar-Br is developed. The microwave assisted reaction proceeded smoothly with good yield with high C5 position selectivity and a possible pathway of direct arylation is discussed. This methodology provides a simple way to construct 1,5-disubstituted 1,2,3-triazoles moiety. (C) 2019 Elsevier Ltd. All rights reserved.

A series of Ce and/or Zr modified WO3-TiO2 catalysts were synthesized by the impregnation method, which were employed for NH3-SCR reaction. The T50 contour lines of NOx were used to quickly optimize catalyst composition, the Ce20Zr12.5WTi catalyst was considered to be the optimization result, and also exhibited excellent NH3-SCR activity and thermal stability with broad operation temperature window, which is a very promising catalyst for NOx abatement from diesel engine exhaust. The excellent catalytic performance is associated with the formation of Ce-Zr solid solution. The introduction of Zr to CeWTi catalyst facilitated the redox of Ce4+/Ce3+ and the formation of more acid sites, more Ce3+ ions, more oxygen vacancies, larger quantities of surface adsorbed oxygen species and NH3, which were beneficial for the excellent selective catalytic reduction (SCR) performance.

目的研究血清胰岛素样生长因子Ⅰ（IGF-Ⅰ）、胰岛素样生长因子蛋白-3（IGFBP-3）对新生儿缺氧缺血性脑病（HIE）的病情评估及预后判断的价值。方法采用酶联免疫吸附测定法检测60例不同程度HIE新生儿生后72h、28d血清IGF-I和IGFBP-3水平。选取同期、同龄30例健康新生儿为对照组,进行上述检测,并进行新生儿神经行为测定（NBNA）。结果①HIE组患儿急性期（生后72h）血清IGF-I和IGFBP-3水平下降,恢复期（生后28d）有所回升;上述两项指标水平均随病情加重而呈下降趋势。急性期各组间比较,差异均有统计学意义。恢复期:轻度组水平接近正常;血清IGF-Ⅰ水平中度组与轻度组、重度组比较,差异均有统计学意义;血清IGFBP-3水平中度组与轻度组比较,差异无统计学意义,与重度组比较,差异有统计学意义。结论 HIE患儿血清IGF-Ⅰ、IGFBP-3水平均下降,且病情越重,下降越明显,恢复期有所回升,但仍低于正常,提示IGF-1、IGFBP-3对临床评价HIE危重程度及预后有重要意义。

在调配药物时严格执行无菌操作规程,根据药物的种类和特性的不同(溶解的难易程度)选择有效的调配方法,寻找更合理、更科学的调配技巧。结果对调配中注意事项进行总结与改进,有利于提高工作质量和工作效率。