Fang Wang

A series of ternary Cu/ZnO/Al ₂ O ₃ Catalysts incorporating different amounts of carbon nanotubes was prepared by co-precipitation. The study then examined how these catalysts promote the selective hydrogenation of hydroxypropionaldehyde (HPA). The physical and chemical properties of carbon nanotube-modified catalysts were characterized using XRD, BET, and H ₂ -TPR characterization techniques. The results showed that the addition of an appropriate amount of carbon nanotubes can affect the crystallinity of the catalyst to a certain extent, making the catalyst more evenly dispersed, and carbon nanotubes have a certain hydrogen storage ability, which can store low-temperature hydrogen on the catalyst and promote the reduction of Cu/ZnO/Al ₂ O ₃ catalyst, which is beneficial for the hydrogenation of HPA.

Cu-silicate-modified Cu-based catalysts with fixed Cu/Zn/Al ratios were prepared via coprecipitation. Their activity in hydroxypivalaldehyde hydrogenation to neopentyl glycol was studied, focusing on the impact of varying Cu-silicate amounts.

Hierarchical SAPO-34 zeolite catalysts were successfully synthesized via a one-step hydrothermal synthesis approach with the assistance of excess triethylamine (TEA).

Cu-based catalysts, modified by gallium addition via the stepwise co-precipitation method, were studied for the liquid phase hydrogenation of hydroxypivalaldehyde (HPA) to neopentyl glycol (NPG). Through physico-chemical techniques, the effects of gallium introduction on the Cu trimetallic catalyst performance and the reaction mechanism of HPA hydrogenation were discussed. The characterization results showed that gallium introduction can influence the dispersion, reduction, and distribution of active Cu species, as well as their reactivity. Herein, the catalyst with 2 wt% gallium addition exhibited excellent catalytic performance with HPA conversion rate and NPG selectivity of 93.5% and 95.5%, at a reaction pressure of 3 MPa, temperature of 110 °C, hydrogen-aldehyde ratio (molar ratio) 10:1, and liquid space-time at a speed of 8.4 h⁻¹. The good performance could be attributed to gallium doping tending to dynamically tune the interaction between the components, increasing Cu dispersion and the distributions of Cu⁺ and Cu⁰ species on the catalyst surfaces.

Volatile organic compounds (VOCs) are important precursors for the formation of secondary pollutants, such as fine particulate matter (PM) and ozone (O₃), which will lead to severe atmospheric environmental problems to restrict the sustainable development of the social economy. Catalytic oxidation is a safe, eco-friendly, and simple method for eliminating VOCs, which can be converted into CO₂ and H₂O without the generation of other harmful substances. The fabrication and development of catalysts are very crucial to enhance the catalytic oxidation efficiency of the removal of VOCs. The noble metal catalyst is one of the commonly used catalysts for the catalytic oxidation of VOCs because of the high reaction activity, good stability, poisoning-resistant ability, and easy regeneration. In this review, the research progress of noble metal (Pt, Pd, Au, Ag, and Ir) catalysts for the removal of VOCs in recent years was summarized with the discussion of the influence factors in the preparation process on the catalytic performance. The reaction mechanisms of the removal of VOCs over the corresponding noble metal catalysts were also briefly discussed.

In this work, Zn-modified SSZ-13 catalysts with different spatial distributions of zinc species were prepared by ion exchange (IE), wet impregnation (WI) andin situsynthesis (IS) methods employed for the methanol-to-olefin (MTO) reaction.