Effect of Promoter on the Performance of Cu-Mn Complex Oxide Monolithic Catalysts for Lean Methane Catalytic Combustion

doi:10.3724/SP.J.1088.2011.10323

Abstract

Abstract: Five Cu-Mn complex-oxide catalysts supported on cordierite (COR) monolithic, Cu-Mn-O/Al₂O₃/COR, Cu-Mn-Ce-O/Al₂O₃/ COR, Cu-Mn-Zr-O/Al₂O₃/COR, Cu-Mn-La-O/Al₂O₃/COR, and Cu-Mn-Ce-Zr-O/Al₂O₃/COR, for the catalytic combustion of lean methane were prepared by wetness impregnation using cordierite as the support. The effect of promoters such as CeO₂, ZrO₂, La₂O₃, and CeO₂-ZrO₂, on the structure and properties of Cu-Mn-O/Al₂O₃was characterized by X-ray photoelectron spectroscopy, H₂ temperature-programmed reduction, and N₂ adsorption-desorption. The catalytic performance of lean methane catalytic combustion over these catalysts was evaluated in a fixed-bed reactor. The results showed that with the introduction of CeO₂, ZrO₂, La₂O₃, and CeO₂-ZrO₂as the promoter to Cu-Mn-O/ Al₂O₃/COR, the specific surface area of the catalysts increases obviously, resulting in an enhancement of active component dispersion and oxygen species concentration on the catalyst surface. Therefore, the surface oxidation reactivity of the catalysts is improved. Besides, the pore structure of the catalysts is also adjusted well, which is beneficial for matching the diffusion-reaction coupling behavior on the catalyst. The activity of Cu-Mn-O/Al₂O₃/COR, especially the low-temperature activity remarkably increases with the promoter addition. Among the tested promoters, ZrO₂ shows the best promoting effect. The methane conversion over Cu-Mn-Zr-O/Al₂O₃/COR monolithic catalyst is up to 90% under the conditions of 570 °C and GHSV = 20000 h^–1.

Key words: copper and manganese complex oxide, rare earth metal oxide, monolithic catalyst, methane, catalytic combustion

ZHANG Jia-Jin, LI Jian-Wei, ZHU Ji-Qin, WANG Yue, CHEN Biao-Hua. Effect of Promoter on the Performance of Cu-Mn Complex Oxide Monolithic Catalysts for Lean Methane Catalytic Combustion[J]. Chinese Journal of Catalysis, 2011, 32(8): 1380-1386.

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