文献类型：期刊文献

英文题名：Superior catalytic activity of a Pd catalyst in methane combustion by fine-tuning the phase of ceria-zirconia support

作者：Ding, Yuanqing[1,2];Wu, Qingqing[1,2];Lin, Bo[1,2];Guo, Yanglong[1,2];Guo, Yun[1,2];Wang, Yunsong[1,2];Wang, Li[1,2];Zhan, Wangcheng[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Res Inst Ind Catalysis, Shanghai 200237, Peoples R China

年份：2020

卷号：266

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：;EI(收录号：20200308051861);WOS:【SCI-EXPANDED(收录号:WOS:000517665200023)】；

基金：This work was financially supported by the National Key Research and Development Program of China (2016YFC0204300), the National Natural Science Foundation of China (21922602, 21577034), and Fundamental Research Funds for the Central Universities (222201717003).

语种：英文

外文关键词：Ceria-zirconia solid solution; Kappa-phase; Methane combustion; Chemical state of Pd; Oxygen mobility

摘要：Methane, one of the greenhouse gases, is controlled by the catalytic combustion that is the most efficient method. Herein, ceria-zirconia solid solutions (CeZrO4) with high specific surface areas and different phases (kappa appa and tetragonal) were synthesized and then used to construct the supported Pd catalyst for methane combustion. Compared to the tetragonal CeZrO4 support (t-CZ), the smaller particle sizes of PdOx and the higher amount of active PdO species are present on the kappa appa CeZrO4 support (kappa-CZ), leading to a higher ability of the Pd/kappa-CZ catalyst for methane activation. More critically, the oxygen mobility of the Pd/t-CZ catalyst is much higher than that of the Pd/t-CZ catalyst. Consequently, an excellent and stable redox cycle of PdO species is achieved on the Pd/kappa-CZ catalyst compared to the Pd/t-CZ catalyst, prompting the oxidation of hydrocarbon fragments. These two factors result into a superior catalytic activity of the Pd/kappa-CZ catalyst for methane combustion.