Citation: Guo-Qing Ren, Guang-Xian Pei, Jing-Cai Zhang, Wei-Zhen Li. Activity promotion of anti-sintering Au₲MgGa₂O₄ using ceria in the water gas shift reaction and catalytic combustion reactions[J]. Chinese Journal of Catalysis, ;2019, 40(4): 600-608. doi: S1872-2067(19)63295-X shu

Activity promotion of anti-sintering Au₲MgGa₂O₄ using ceria in the water gas shift reaction and catalytic combustion reactions

a Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
b University of Chinese Academy of Sciences, Beijing 100049, China;
c Dalian National Laboratory for Clean Energy, CAS, Dalian 116023, Liaoning, China

Received Date: 26 November 2018
Revised Date: 3 January 2019

Fund Project: This work was supported by the National Key R&D Program of China (2016YFA0202801), the National Natural Science Foundation of China (21403213, 21673226), the "Transformational Technologies for Clean Energy and Demonstration" Strategic Priority Research Program of the Chinese Academy of Sciences (XDA21040200), and the "Hundred Talents Programme" of the Chinese Academy of Sciences.

Heterogeneous gold nanocatalysts have both inspired researchers with their unique catalytic performance and frustrated them due to the contradictions observed in their activities and stabilities. A recent breakthrough has shown that gold nanoparticles (NPs) can retain their catalytically active size over a MgGa₂O₄ spinel support upon sintering at high temperatures. Herein, we report the catalytic activity of anti-sintering Au₲MgGa₂O₄ for use in water gas shift reaction (WGSR) and catalytic combustion reactions, and the promoting effect of ceria. Upon adding ceria to 800℃-aged Au₲MgGa₂O₄, the CO conversion in the WGSR was increased from~1.5% to~34.0% at 450℃, and the "light-off" temperatures (T₅₀) for methane combustion and CO oxidation were decreased by~80 and~100℃, respectively. Characterizations using XRD, HAADF-STEM, EDS mapping, H₂-TPR, XPS, and DRIFTs confirmed the proximate contact of Au with ceria and their significant synergistic effect, which thereby combined the benefits of ceria toward the dissociation of H₂O or O₂ and the Au NPs toward activating CO or CH₄. These results show that this stepwise stabilization-activation strategy is efficient for rationally constructing stable and active gold nanocatalysts, which may open up possibilities for the wide application of gold nanocatalysts at elevated temperatures.
- Gold nanocatalyst,
- CeO₂ promoter,
- Magnesium gallate spinel,
- Water gas shift,
- Catalytic combustion
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通讯作者: 陈斌, bchen63@163.com

Activity promotion of anti-sintering Au₲MgGa₂O₄ using ceria in the water gas shift reaction and catalytic combustion reactions