文献类型：期刊文献

英文题名：Enhanced Catalytic Oxidation Reactivity over Atomically Dispersed Pt/CeO2 Catalysts by CO Activation

作者：Li, Zihao[1];Liu, Zhisong[1];Gao, Guanqun[1];Zhao, Weina[2];Jiang, Yongjun[3,4];Tang, Xuan[3,4];Dai, Sheng[3,4];Qu, Zan[1];Yan, Naiqiang[1];Ma, Lei[1]

机构：[1]Shanghai Jiao Tong Univ, Sch Environm Sci & Engn, Shanghai 200240, Peoples R China;[2]Guangdong Univ Technol, Inst Environm Hlth & Pollut Control, Sch Environm Sci & Engn, Guangdong Key Lab Environm Catalysis & Hlth Risk C, Guangzhou 510006, Peoples R China;[3]East China Univ, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Feringa Nobel Prize Scientist Joint Res Ctr, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2024

卷号：58

期号：27

起止页码：12201

外文期刊名：ENVIRONMENTAL SCIENCE & TECHNOLOGY

收录：;EI(收录号：20242716601508);WOS:【SCI-EXPANDED(收录号:WOS:001258201300001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (22176122 and 22376062), the Shanghai Pujiang Program (20PJ1407000), the Oceanic Interdisciplinary Program of Shanghai Jiao Tong University (SL2022ZD104), the Science and Technology Commission of Shanghai Municipality (22ZR1415700), Shanghai Rising-star Program (20QA1402400), and the Fundamental Research Funds for the Central Universities. Z.L. is grateful for the discussion about the XPS data with Nannan Zhang at The Instrumental Analysis Center of Shanghai Jiao Tong University.

语种：英文

外文关键词：catalytic oxidation; Pt/CeO2 catalysts; CO reduction; reaction mechanism; oxygen vacancy

摘要：The elevation of the low-temperature oxidation activity for Pt/CeO2 catalysts is challenging to meet the increasingly stringent requirements for effectively eliminating carbon monoxide (CO) from automobile exhaust. Although reducing activation is a facile strategy for boosting reactivity, past research has mainly concentrated on applying H-2 as the reductant, ignoring the reduction capabilities of CO itself, a prevalent component of automobile exhaust. Herein, atomically dispersed Pt/CeO2 was fabricated and activated by CO, which could lower the 90% conversion temperature (T-90) by 256 degrees C and achieve a 20-fold higher CO consumption rate at 200 degrees C. The activated Pt/CeO2 catalysts showed exceptional catalytic oxidation activity and robust hydrothermal stability under the simulated working conditions for gasoline or diesel exhausts. Characterization results illustrated that the CO activation triggered the formation of a large portion of Pt-0 terrace sites, acting as inherent active sites for CO oxidation. Besides, CO activation weakened the Pt-O-Ce bond strength to generate a surface oxygen vacancy (V-o). It served as the oxygen reservoir to store the dissociated oxygen and convert it into active dioxygen intermediates. Conversely, H-2 activation failed to stimulate V-o, but triggered a deactivating transformation of the Pt nanocluster into inactive PtxOy in the presence of oxygen. The present work offers coherent insight into the upsurging effect of CO activation on Pt/CeO2, aiming to set up a valuable avenue in elevating the efficiency of eliminating CO, C3H6, and NH3 from automobile exhaust.