文献类型：期刊文献

英文题名：Enhanced catalytic performance of atomically dispersed Pd on Pr-doped CeO2 nanorod in CO oxidation

作者：Deng, Yanbo[1];Tian, Pengfei[2,3];Liu, Shijie[1];He, Huaqiang[1];Wang, Yuan[1];Ouyang, Like[1];Yuan, Shaojun[1]

机构：[1]Sichuan Univ, Coll Chem Engn, Low Carbon Technol & Chem React Engn Lab, Chengdu 610065, Peoples R China;[2]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai, Peoples R China;[3]East China Univ Sci & Technol, Sch Mech & Power Engn, China Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China

年份：2022

卷号：426

外文期刊名：JOURNAL OF HAZARDOUS MATERIALS

收录：;EI(收录号：20214911259342);WOS:【SCI-EXPANDED(收录号:WOS:000765984900002)】；

基金：This work was financially supported by the National Natural Science Foundation of China, China (22008158 and 21808057), the Project of the Department of Science and Technology of Sichuan Province, China (2020ZHCG0014 and 2020YFG0070), the Open Project of State Key Laboratory of Industrial Vent Gas Reuse, China (SKLIVGR-2021-01) and the Fundamental Research Funds for the Central Universities of China, China. The characterizations of BET and XRD by the Institute of New Energy and Low Carbon Technology of Sichuan University, AC-HAADFSTEM, and XAFS measurement by Ceshigo Research Service (htt p://www.ceshigo.com), the XPS analysis by Zhang San from Shiyanjia Lab (www.shiyanjia.com), and the DRIFT, Raman spectra and TEM measurements by the Engineering Teaching Center, School of Chemical Engineering, Sichuan University.

语种：英文

外文关键词：Atomically dispersed Pd; Pr doping; Oxygen vacancy; CO oxidation

摘要：Single-atom noble metal catalysts have been widely studied for catalytic oxidation of CO. Regulating the coor-dination environment of single metal atom site is an effective strategy to improve the intrinsic catalytic activity of single atom catalyst. In this work, single atom Pd catalyst supported on Pr-doped CeO2 nanorods was prepared, and the performance and nature of Pr-coordinated atomic Pd site in CO catalytic oxidation are systematically investigated. The structure characterization using AC-HAADF-STEM, EXAFS, XRD and Raman spectroscopy demonstrate the formation of single atom Pd site and abundant surface oxygen vacancies on the surface of Pr-doped CeO2 nanorod. With the combination of the XPS characterization and DFT calculations, the oxidation state of Pd on Pr-doped CeO2 nanorod is determined lower than that on CeO2 nanorod. The turnover frequency of CO oxidation is markedly increased from 8.4 x 10(-3) to 31.9 x 10(-3) s with Pr-doping at 130 degrees C and GHSV of 70,000 h(-1). Combined with kinetic studies, DRIFT and DFT calculations, the doped-Pr atoms reduced the formation energy of oxygen vacancies and generate more oxygen vacancies around the atomically dispersed Pd sites on the surface of cerium oxide, which reduces the dissociation energy of oxygen, thereby accelerating the reaction rate of CO oxidation.