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Few-Atom Pt Ensembles Enable Efficient Catalytic Cyclohexane Dehydrogenation for Hydrogen Production

Yuchen Deng, Yu Guo, Zhimin Jia, Jin-Cheng Liu, Jinqiu Guo, Xiangbin Cai, Chunyang Dong, Meng Wang, Chengyu Li, Jiangyong Diao, Zheng Jiang, Jinglin Xie, Ning Wang, Hai Xiao, Bingjun Xu, Hongbo Zhang, Hongyang Liu, Jun Li, Ding Ma

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY(2022)

Cited 47|Views19
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Abstract
Identification of catalytic active sites is pivotal in the design of highly effective heterogeneous metal catalysts, especially for structure-sensitive reactions. Downsizing the dimension of the metal species on the catalyst increases the dispersion, which is maximized when the metal exists as single atoms, namely, single-atom catalysts (SACs). SACs have been reported to be efficient for various catalytic reactions. We show here that the Pt SACs, although with the highest metal atom utilization efficiency, are totally inactive in the cyclohexane (C6H12) dehydrogenation reaction, an important reaction that could enable efficient hydrogen transportation. Instead, catalysts enriched with fully exposed few-atom Pt ensembles, with a Pt-Pt coordination number of around 2, achieve the optimal catalytic performance. The superior performance of a fully exposed few-atom ensemble catalyst is attributed to its high d-band center, multiple neighboring metal sites, and weak binding of the product.
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Key words
dehydrogenation production,few-atom
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