Preparation and Characterization of Au/CuxMnyOz Catalyst and Its Catalytic Performance for CO Removal

doi:10.3724/SP.J.1088.2011.10228

Abstract

Abstract: This paper presented the study on the catalytic performance of a deposition-precipitation prepared Au catalyst supported on copper-manganese complex oxide, which was synthesized via a sol-gel method. This Au/Cu_xMn_yO_z catalyst with a low Au content exhibited high activity for both preferential CO oxidation and water-gas shift reaction. The structure-activity relationship was investigated by N₂ physisorption, X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, H₂ temperature-programmed reduction, and X-ray fluorescence characterization. The results revealed that the Cu_xMn_yO_z samples exist mainly in the form of nonstoichiometric spinel Cu_1.5Mn_1.5O₄ phase, which favors the CO conversion in both CO removal reactions. Most Au species dispersed onto the surface of Cu-Mn complex oxide in the metallic state of Au⁰. The relatively strong interaction between Au and support enhanced the reducibility of Au/Cu_xMn_yO_zcatalyst, which is also responsible for the excellent performance of the as-prepared catalyst.

Key words: copper, manganese, complex oxide, gold, supported catalyst, carbon monoxide, preferential oxidation, water-gas shift

SHE Yu-Sheng, SUN Wei-Hua, ZHAN Ying-Ying, LIN Xing-Yi, ZHENG Qi. Preparation and Characterization of Au/CuxMnyOz Catalyst and Its Catalytic Performance for CO Removal[J]. Chinese Journal of Catalysis, 2011, 32(7): 1220-1226.

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