文献类型：期刊文献

英文题名：New mechanism insights into methane steam reforming on Pt/Ni from DFT and experimental kinetic study

作者：Niu, Juntian[1,2];Wang, Yalan[2];Qi, Yanying[2];Dam, Anh H.[2];Wang, Hongmin[2];Zhu, Yi-An[3];Holmen, Anders[2];Ran, Jingyu[1];Chen, De[2]

机构：[1]Chongqing Univ, Minist Educ PRC, Key Lab Low Grade Energy Utilizat Technol & Syst, Chongqing 400044, Peoples R China;[2]Norwegian Univ Sci & Technol, Dept Chem Engn, N-7491 Trondheim, Norway;[3]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2020

卷号：266

外文期刊名：FUEL

收录：;EI(收录号：20200408085355);WOS:【SCI-EXPANDED(收录号:WOS:000510603500061)】；

基金：The authors would like to thank the Project Supported by Chongqing Special Postdoctoral Science Foundation (No. XmT2019008), National Natural Science Foundation of China (Grant No. 51976019), China Scholarship Council (Grant No. 201606050054), and Department of Chemical Engineering, Norwegian University of Science and Technology, Norway. The computational calculations provided by Notur project (www.notur.no) are highly acknowledged (nn4685k).

语种：英文

外文关键词：CH4/H2O reforming; OH-assisted activation; Kinetic study; Ni@Pt

摘要：In this contribution, we combine density functional theory (DFT) calculations, experimental kinetic study and DFT-assisted analysis to elucidate the impact of the interface of monolayer Pt on the Ni surface on catalytic performance of steam methane reforming including carbon formation on core-shell (Ni@Pt) catalysts and compare it with Ni and Pt catalysts. We demonstrate that core-shell structured Ni@Pt significantly lowers the carbon formation without sacrificing much the activity. The DFT results demonstrate that the metal identity, core shell structure and support have significant impacts on the reaction mechanisms. The direct methane activation is energetically favorable reaction pathway on Ni, while the OH* assisted methane activation is the favorable pathway on Pt and Ni@Pt catalysts, where methane activation is the rate-determining step on all catalysts. We unambiguously reveal that the core-shell Ni@Pt catalyst modified the surface Pt electron density and shifted d-band center away from Fermi level compared to Ni(1 1 1) and Pt(1 1 1). It results in a strong basic surface OH* which actively reacts with CHx and thus enhances carbon formation resistance. Above all, Ni-core/Pt-shell particle could decouple the activity and carbon resistance to keep the activity and reduce carbon formation simultaneously in methane steam reforming. In addition, by taking into account the activation of steam on the support, the effective activation energy estimated from DFT-assisted analysis is well consistent with the experimental value on the both Ni and Ni@Pt catalysts, which could shed some light on building a bridge between experimental work and DFT-assisted kinetic study.