Concerted oxygen diffusion across heterogeneous oxide interfaces for intensified propane dehydrogenation

Sai Chen, Ran Luo, Zhi-Jian Zhao, Chunlei Pei, Yiyi Xu, Zhenpu Lu, Chengjie Zhao, Hongbo Song and Jinlong Gong ()
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Sai Chen: Tianjin University
Ran Luo: Tianjin University
Zhi-Jian Zhao: Tianjin University
Chunlei Pei: Tianjin University
Yiyi Xu: Tianjin University
Zhenpu Lu: Tianjin University
Chengjie Zhao: Tianjin University
Hongbo Song: Tianjin University
Jinlong Gong: Tianjin University

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: 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-CrOx/Al2O3 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 O2- 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.

Date: 2023
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DOI: 10.1038/s41467-023-38284-0

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