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Citation: Huanhuan Liu, Aiping Jia, 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. doi: 10.1016/S1872-2067(15)60950-0 shu

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

  • 1.

    Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang, China

  • Corresponding author: Jiqing Lu, 
  • Received Date: 16 May 2015
    Available Online: 28 June 2015

    Fund Project: 国家自然科学基金(21173195). (21173195)

  • 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.
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