Sen Fu's research while affiliated with Minzu University of China and other places

BACKGROUND A series of ZSM‐5@KIT‐6 composite molecular sieve catalysts was prepared by encapsulating ZSM‐5 as a substrate in the mesoporous material KIT‐6. The intent was to use these catalysts to promote the catalytic cracking of a waste cooking oil model compound (WCOMC) to produce light olefins. RESULTS The morphology, structural characteristics and acidity of each of the resulting catalysts were characterized by X‐ray diffraction, transmission electron microscopy, N2‐Brunauer–Emmett–Teller (N2‐BET) surface area analysis and temperature‐programmed ammonia desorption. The results showed that ZSM‐5 was successfully coated with KIT‐6. The BET surface areas of these catalysts ranged from 345 to 792 m² g⁻¹ and the specimens had average pore sizes in the range of 2.37–5.51 nm. Total acidity increased with increases in the mass‐based proportion of ZSM‐5 in the material. CONCLUSION The catalytic cracking of WCOMC was studied in a lab‐scale fixed‐bed apparatus. Trials at a reaction temperature of 600 °C using the material having a mass‐based ZSM‐5 proportion of 80.0% (ZK‐80) gave the highest gas‐phase yield of light olefins of 43.8%. After 6000 min, the catalytic performance of this material remained stable, demonstrating a resistance to carbon deposits. The superior activity of the present composite catalysts can be ascribed to improvements in pore structure and acid strength distribution. © 2023 Society of Chemical Industry (SCI).

Syngas production from waste cooking oil (WCO) based on reforming with CO2 would allow the utilization of both resources. However, the catalysts used for reforming reactions (700-1000 °C) are prone to deactivation. In this work, La1−xSrxNiO3 (x = 0.1, 0.2) perovskites were prepared as catalyst precursors, then reduced and used for CO2 reforming of a waste cooking oil model compound (WCOMC). These materials exhibited stable catalytic activity during the reaction, attributed to the highly dispersed Ni⁰ nanoparticles on the La2O3 support and strong interactions between the metal and support. At 800 °C, the deposited amount of carbon on these catalysts decreased with increasing quantity of Sr doping into the A site of LaNiO3 and the syngas had a H2/CO ratio of 0.77. The present Sr-doped catalysts promoted the surface adsorption of oxygen along with the activation of C-H bonds. Most importantly, these materials strongly adsorbed CO2 and facilitated the conversion of carbon deposition to gaseous products.