In situ IR, pulse reaction and TPD-ITD study of catalytic performance of room-temperature carbon monoxide oxidation on supported gold catalysts

Article type: Research Article

Authors: Hao, Zheng-ping | Zhang, Shi-chao | Liu, Zhi-ming | Zhang, Hui-ping

Affiliations: Research Center for Eco-Environmental Sciences, Chinese Academyof Sciences, Beijing 100085, China | Department of Material Science , Beijing University of Aeronautics and Astronautics,Beijing 100083, China | Department of Chemical Engineering,Xiamen University, Xiamen 361005, China

Note: [] Corresponding author, E-mail:zpinghao@mail.rcees.ac.cn

Abstract: With in situ IR, two different CO adsorption bands were detected on various chemical state gold catalysts. One band is attributed to the linear CO on an oxidized gold catalyst(2100 cm ^-1),the other one is ascribed to the bridged CO on metallic gold (2085cm^-1). CO pulse reaction showed that Au/Fe_2O_3 catalyst had a room-temperature activity even in the presence of moisture. The produced CO_2 was detained and more easily desorbed from supported gold catalyst than support oxide. TPD-IDT results indicated that the O_2^- superoxide ions are the possible active oxygen species.

Keywords: supported gold catalyst, room-temperature CO oxidation, pulse reaction, TPD-ITD technique

Journal: Journal of Environmental Sciences, vol. 14, no. 4, pp. 489-494, 2002