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.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37041149.
- Also identified by DOI 10.1038/s41467-023-37818-w and PMC identifier 10090184.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
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<sub>3</sub>-Fe<sub>2</sub>O<sub>3</sub> redox catalysts for promoted propylene production. Atomically dispersed Mo species over γ-Fe<sub>2</sub>O<sub>3</sub> 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<sub>2</sub>O<sub>3</sub> to Fe<sub>3</sub>O<sub>4</sub> contribute to selectively oxidative dehydrogenation instead of over-oxidation in pristine γ-Fe<sub>2</sub>O<sub>3</sub>. 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.