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Concerted oxygen diffusion across heterogeneous oxide interfaces for intensified propane dehydrogenation.
- Source :
- Nature Communications; 5/5/2023, Vol. 14 Issue 1, p1-11, 11p
- Publication Year :
- 2023
-
Abstract
- Propane dehydrogenation (PDH) is an industrial technology for direct propylene production which has received extensive attention in recent years. Nevertheless, existing non-oxidative dehydrogenation technologies still suffer from the thermodynamic equilibrium limitations and severe coking. Here, we develop the intensified propane dehydrogenation to propylene by the chemical looping engineering on nanoscale core-shell redox catalysts. The core-shell redox catalyst combines dehydrogenation catalyst and solid oxygen carrier at one particle, preferably compose of two to three atomic layer-type vanadia coating ceria nanodomains. The highest 93.5% propylene selectivity is obtained, sustaining 43.6% propylene yield under 300 long-term dehydrogenation-oxidation cycles, which outperforms an analog of industrially relevant K-CrO<subscript>x</subscript>/Al<subscript>2</subscript>O<subscript>3</subscript> catalysts and exhibits 45% energy savings in the scale-up of chemical looping scheme. Combining in situ spectroscopies, kinetics, and theoretical calculation, an intrinsically dynamic lattice oxygen "donator-acceptor" process is proposed that O<superscript>2-</superscript> generated from the ceria oxygen carrier is boosted to diffuse and transfer to vanadia dehydrogenation sites via a concerted hopping pathway at the interface, stabilizing surface vanadia with moderate oxygen coverage at pseudo steady state for selective dehydrogenation without significant overoxidation or cracking. Non-oxidative dehydrogenation technologies suffer from the thermodynamic equilibrium limitations and severe coking. Here, the authors report the intensified propane dehydrogenation to propylene by the chemical looping engineering on nanoscale core-shell redox catalysts. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20411723
- Volume :
- 14
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nature Communications
- Publication Type :
- Academic Journal
- Accession number :
- 163554811
- Full Text :
- https://doi.org/10.1038/s41467-023-38284-0