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Coupling acid catalysis and selective oxidation over MoO3-Fe2O3 for chemical looping oxidative dehydrogenation of propane.
- Source :
- Nature Communications; 4/11/2023, Vol. 14 Issue 1, p1-12, 12p
- Publication Year :
- 2023
-
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 MoO<subscript>3</subscript>-Fe<subscript>2</subscript>O<subscript>3</subscript> redox catalysts for promoted propylene production. Atomically dispersed Mo species over γ-Fe<subscript>2</subscript>O<subscript>3</subscript> 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-Fe<subscript>2</subscript>O<subscript>3</subscript> to Fe<subscript>3</subscript>O<subscript>4</subscript> contribute to selectively oxidative dehydrogenation instead of over-oxidation in pristine γ-Fe<subscript>2</subscript>O<subscript>3</subscript>. 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 MoO<subscript>3</subscript>-Fe<subscript>2</subscript>O<subscript>3</subscript> redox catalyst with dispersed Mo species on γ-Fe<subscript>2</subscript>O<subscript>3</subscript> 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20411723
- Volume :
- 14
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nature Communications
- Publication Type :
- Academic Journal
- Accession number :
- 163023069
- Full Text :
- https://doi.org/10.1038/s41467-023-37818-w