Regulating Potassium State to Enable the High Performance of Co3o4 for Catalytic Oxidation

作     者：Wang, Li Hu, Wende Shang, Zhou Cao, Xiaoming Guo, Yun Li, Jiayi Gu, Qiyuan Li, Ke Li, Xiaobo 

作者机构：Key Laboratory for Advanced Materials Research Institute of Industrial Catalysis School of Chemistry & Molecular Engineering East China University of Science and Technology Shanghai200237 China GRINM Resources and Environment Tech. Co. Ltd. Beijing101407 China Shanghai Marine Diesel Engine Research Institute Shanghai200090 China 

出 版 物：《SSRN》 

年 卷 期：2022年

核心收录：

主　　题：Combustion 

摘      要：Enhancement in oxidation performance of Co 3 O 4 -based catalysts can be achieved by regulating K, and the promotion effects were strongly depended on the amount and existing state of K. Only the surface Co substituted by optimum amount of K (CoK 2 with K/Co mole ratio of 1.56×10 -2 ), unexpectedly high activities could be achieved. The specific activity of CoK 2 were 20 and 2.7 times higher than that of Co 3 O 4 for CO oxidation and CH 4 combustion. However, the excess K in the form of carbonate or nitrate deactivated the active sites, so the performance against K amount behaved as a volcano curve. Based upon the electronic and structural modification of K, the electron density of Co and O simultaneously decreased which weakened CO adsorption strength and improved the C-H bond activation. Since efficiency in various pollutants removal, CoK 2 could be considered as a promising candidate for noble metal catalysts. © 2022, The Authors. All rights reserved.