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HSCO2-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SO42-的生成.SO24-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.
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 (HSCO2) species as a key intermediate. Surface SO4^2- was identified with in situ DRIFTS and tC. It was found that the accumulation of sulfate on catalyst led to the poisoning of Al2O3 in the presence of oxygen.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2007年第7期997-1002,共6页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(20637001
50621804)资助项目
关键词
羰基硫
催化水解
氧中毒
硫酸盐
氧化铝
Carbonyl sulfide
Catalytic hydrolysis
Oxygen poisoning
Sulfate
Alumina