脱氢
催化作用
化学
环己烷
Atom(片上系统)
金属
氢
氢原子
有机化学
计算机科学
嵌入式系统
烷基
作者
Yuchen Deng,Yu Guo,Zhimin Jia,Jincheng 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
摘要
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.
科研通智能强力驱动
Strongly Powered by AbleSci AI