Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (07): 997-1002.doi: 10.1016/S1872-1508(07)60054-0

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Oxygen Poisoning Mechanismof Catalytic Hydrolysis of OCS over Al2O3 at Room Temperature

LIU Jun-Feng; LIU Yong-Chun; XUE Li; YU Yun-Bo; HE Hong   

  1. State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, P. R. China
  • Received:2007-01-02 Revised:2007-04-05 Published:2007-07-03
  • Contact: HE Hong E-mail:Honghe@rcees.ac.cn

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Abstract: The oxygen poisoning mechanism of the catalytic hydrolysis of carbonyl sulfide (OCS) over alumina at room temperature was investigated using in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS), XRD, BET, and ion chromatograph (IC). The surface hydroxyl (—OH) species triggered the catalytic hydrolysis of OCS on Al2O3, with the formation of surface hydrogen thiocarbonate (HSCO-2) species as a key intermediate. Surface SO2-4 was identified with in situ DRIFTS and IC. It was found that the accumulation of sulfate on catalyst led to the poisoning of Al2O3 in the presence of oxygen.

Key words: Carbonyl sulfide, Catalytic hydrolysis, Oxygen poisoning, Sulfate, Alumina