氧化铝基COS、CS_2水解催化剂表面碱性和催化作用

The Surface Basicity and Catalysis over the Alumina Based Catalysts for COS and CS 2 Hydrolysis

进行了３种氧化铝基催化剂上ＣＯ２的ＴＰＤ和ＣＯＳ、ＣＳ２的水解活性研究．结果表明，催化剂表面碱性中心类型、强度和数目是不相同的；Ｋ２Ｏ和Ｐｔ的负载能提高弱碱性中心的数目和强度，同时能显著提高ＣＯＳ、ＣＳ２的水解转化率．关联第一类ＣＯ２脱附活化能和峰面积与ＣＯＳ水解反应活化能和速率常数，发现呈线性关系，说明弱碱性中心是ＣＯＳ催化水解的活性中心．关联第一、二两类ＣＯ２脱附峰面积与ＣＳ２水解速率常数，指出弱、次弱两类碱性中心均参与了ＣＳ２催化水解．催化剂表面上能量的分布是不均匀的．

CO 2 TPD and COS or CS 2 hydrolysis over three alumina based catalysts were studied. The results show that the type, intensity and number of catalyst surface basic centers are different for these catalysts. K 2O and Pt loadings improve the number and intensity of surface basic centers of the catalysts and the conversion of COS or CS 2 hydrolysis. By mathematical correlation, it is found that activation energy and peak area of the first type CO 2 desorption are proportional to the activation energy and the rate constant of COS hydrolysis respectively, whereas the peak areas of the first and the second type desorption centers are linear with the CS 2 hydrolysis rate constants. Thus the weak basic centers are the catalytic active center for COS hydrolysis, the weak and the next weak basic centers are the catalytic active center of CS 2 hydrolysis.The surface energy distribution on the catalysts is heterogeneous.