脱氢
催化作用
氧化还原
丙烷
化学链燃烧
化学
氧气
选择性
光化学
无机化学
组合化学
有机化学
作者
Xianhui Wang,Chunlei Pei,Zhi‐Jian Zhao,Sai Chen,Xinyu Li,Jiachen Sun,Hongbo Song,Guodong Sun,Wei Wang,Xin Chang,Xianhua Zhang,Jinlong Gong
标识
DOI:10.1038/s41467-023-37818-w
摘要
Redox catalysts play a vital role in chemical looping oxidative dehydrogenation processes, which have recently been considered to be a promising prospect for propylene production. This work describes the coupling of surface acid catalysis and selective oxidation from lattice oxygen over MoO3-Fe2O3 redox catalysts for promoted propylene production. Atomically dispersed Mo species over γ-Fe2O3 introduce effective acid sites for the promotion of propane conversion. In addition, Mo could also regulate the lattice oxygen activity, which makes the oxygen species from the reduction of γ-Fe2O3 to Fe3O4 contribute to selectively oxidative dehydrogenation instead of over-oxidation in pristine γ-Fe2O3. The enhanced surface acidity, coupled with proper lattice oxygen activity, leads to a higher surface reaction rate and moderate oxygen diffusion rate. Consequently, this coupling strategy achieves a robust performance with 49% of propane conversion and 90% of propylene selectivity for at least 300 redox cycles and ultimately demonstrates a potential design strategy for more advanced redox catalysts.
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