Enhanced CO oxidation over potassium-promoted Pt/Al2O3 catalysts: Kinetic and infrared spectroscopic study

doi:10.1016/S1872-2067(15)60950-0

Abstract

Abstract:

A series of K-promoted Pt/Al₂O₃ catalysts were tested for CO oxidation. It was found that the addition of K significantly enhanced the activity. A detailed kinetic study showed that the activation energies of the K-containing catalysts were lower than those of the K-free ones, particularly for catalysts with high Pt contents (51.6 kJ/mol for 0.42K-2.0Pt/Al₂O₃ and 63.6 kJ/mol for 2.0Pt/Al₂O₃). The CO reaction orders were higher for the K-containing catalysts (about -0.2) than for the K-free ones (about -0.5), with the former having much lower equilibrium constants for CO adsorption than the latter. In situ Fourier-transform infrared spectroscopy showed that surface CO desorption from the 0.42K-2.0Pt/Al₂O₃ catalyst was easier than from 2.0Pt/Al₂O₃. The promoting effect of K was therefore caused by weakening of the interactions between CO and surface Pt atoms. This decreased coverage of the catalyst with CO and facilitated competitive O₂ chemisorption on the Pt surface, and significantly lowered the reaction barrier between chemisorbed CO and O₂ species.

Key words: CO oxidation, Potassium, Kinetics, Pt/Al₂O₃ catalyst, Promoting effect

Huanhuan Liu, Aiping Jia, Yuwang, Mengfei Luo, Jiqing Lu. Enhanced CO oxidation over potassium-promoted Pt/Al₂O₃ catalysts: Kinetic and infrared spectroscopic study[J]. Chinese Journal of Catalysis, 2015, 36(11): 1976-1986.

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Enhanced CO oxidation over potassium-promoted Pt/Al₂O₃ catalysts: Kinetic and infrared spectroscopic study

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