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- Title
Coupling acid catalysis and selective oxidation over MoO<sub>3</sub>-Fe<sub>2</sub>O<sub>3</sub> for chemical looping oxidative dehydrogenation of propane.
- Authors
Wang, Xianhui; Pei, Chunlei; Zhao, Zhi-Jian; Chen, Sai; Li, Xinyu; Sun, Jiachen; Song, Hongbo; Sun, Guodong; Wang, Wei; Chang, Xin; Zhang, Xianhua; Gong, Jinlong
- Abstract
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. A MoO3-Fe2O3 redox catalyst with dispersed Mo species on γ-Fe2O3 is synthesized for the oxidative dehydrogenation of propane via chemical looping. Acid sites and lattice oxygen regulation promote the production of and selectivity for propylene.
- Subjects
OXIDATIVE dehydrogenation; PROPANE; CATALYSIS; OXIDATIVE coupling; OXIDATION; SURFACE reactions
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-37818-w