期刊
NANO LETTERS
卷 14, 期 8, 页码 4792-4796出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl501969k
关键词
Hydrogen spillover; nanoparticles; catalysis; surface diffusion; transport limited; CO2 methanation
类别
资金
- Office of Basic Energy Sciences, Materials Science and Engineering Division and the Division of Chemical Sciences, Geological and Biosciences of the U.S. Department of Energy [DE-AC02-05CH11231]
- Total S.A.
Hydrogen spillover is of great importance to understanding many phenomena in heterogeneous catalysis and has long been controversial. Here we exploit well-defined nanoparticles to demonstrate its occurrence through evaluation of CO2 methanation kinetics. Combining platinum and cobalt nanoparticles causes a substantial increase in reaction rate, but increasing the spatial separation between discrete cobalt and platinum entities results in a dramatic similar to 50% drop in apparent activation energy, symptomatic of H atom surface diffusion limiting the reaction rate.
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