An Operando Study of H2O-Enhanced Low-Temperature CO Oxidation on Pt(111) under Near Ambient Pressure Conditions

被引：3
|
作者：
Chai, Peng [1 ,2 ,3 ]
Wu, Zongfang [1 ,2 ,3 ]
Wu, Longxia [1 ,2 ,3 ]
Wang, Haocheng [1 ,2 ,3 ]
Fu, Cong [1 ,2 ,3 ]
Huang, Weixin [1 ,2 ,3 ]
机构：
[1] Univ Sci & Technol China, Anhui Higher Educ Inst, Hefei Natl Res Ctr Phys Sci Microscale, Collaborat Innovat Ctr Chem Energy Mat,Key Lab Sur, Hefei 230026, Peoples R China
[2] Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Peoples R China
[3] Chinese Acad Sci, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China
来源：
ACS CATALYSIS | 2022年 / 12卷 / 21期
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
reaction mechanism; moisture effect; model catalysts; PM-IRAS; XPS; TDS; DENSITY-FUNCTIONAL THEORY; CATALYTIC-OXIDATION; SURFACE SCIENCE; CARBON-MONOXIDE; FORMIC-ACID; WATER; DECOMPOSITION; MECHANISM; HYDROXYL; KINETICS;
D O I：
10.1021/acscatal.2c04339
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Fundamental studies of catalytic reaction mecha-nisms of working catalysts are of great interest and importance. Herein we report an operando study of moisture effect on low-temperature CO oxidation on Pt(111) under near ambient pressure conditions using a flow mode reactor equipped with a polarization-modulation infrared reflection absorption spectrosco-py and online mass spectroscopy to monitor surface species and reaction rates, respectively. The moisture was observed to enhance the CO oxidation rate on Pt(111) between 290 and 320 K, and the enhancement effect varies with reaction temperature. Character-ization results of Pt(111) surface after CO oxidation reactions suggest reversibly adsorbed OH species and irreversibly adsorbed COOH species resulting from water activation on Pt(111) at temperatures around 300 K as the key surface intermediates. These results provide experimental evidence for water-enhanced low-temperature CO oxidation on Pt(111) under near ambient pressure conditions.
引用
收藏
页码：13292 / 13299
页数：8
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