物理化学学报 >> 2007, Vol. 23 >> Issue (07): 997-1002.doi: 10.1016/S1872-1508(07)60054-0

研究论文 上一篇    下一篇

Al2O3上羰基硫常温催化水解的氧中毒机理

刘俊锋; 刘永春; 薛莉; 余运波; 贺泓   

  1. 中国科学院生态环境研究中心, 环境化学与生态毒理学国家重点实验室, 北京 100085
  • 收稿日期:2007-01-02 修回日期:2007-04-05 发布日期:2007-07-03
  • 通讯作者: 贺泓 E-mail:Honghe@rcees.ac.cn

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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摘要： 利用原位漫反射傅立叶变换红外光谱、X光衍射、BET、离子色谱(IC)等手段, 对Al2O3常温催化水解羰基硫(OCS)的氧中毒机理进行了研究. 实验表明, 表面—OH在OCS的催化水解反应中起关键作用, 表面HSCO-2物种是OCS催化水解反应的中间体. 有氧条件下, 利用原位红外光谱和离子色谱检测到了催化剂表面SO2-4的生成. SO2-4在催化剂表面积累是Al2O3上OCS常温催化水解氧中毒的主要原因.<

关键词: 羰基硫, 催化水解, 氧中毒, 硫酸盐, 氧化铝

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