采用PASCA技术研究正电子素o-Ps在MoNi/Al_2O_3加氢催化剂上的反应动力学  

KINETICS STUDY OF POSITRONIUM o-Ps ON MoNi/Al_2O_3 HYDROTREATING CATALYST BY PASCA

作　　者：徐友明[1] 沈本贤[1] 何金海[2] 朱俊[3] 罗锡辉[2] 

机构地区：[1]华东理工大学化工学院,上海200237 [2]中国石化抚顺石油化工研究院,辽宁抚顺113001 [3]武汉大学物理科学与技术学院,湖北武汉430072

出　　处：《石油学报（石油加工）》2007年第1期46-50,共5页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：中国石油化工股份有限公司项目(104082)资助

摘　　要：采用化学分析正电子湮没谱(PASCA)技术研究正电子素(o-Ps)在MoNi/Al2O3加氢催化剂上的反应动力学。在20-100℃、1×10-5Pa真空度下,得到o-Ps在催化剂上反应的表观活化能为11.09 kJ/mol、反应频率因子(A)为1.178×1010kg/(mol.s)和反应速率常数(K)为1.344×108kg/(mol.s)(25℃),并在此基础上建立了反应动力学方程。进一步探讨了同一载体担载不同金属时反应速率常数变化的规律,发现其中的特征关联常数(k)只与Al2O3载体本身特征有关,而与其所担载的金属类型无关。用k值可以定量表征金属-载体之间的相互作用程度(MSI),为指导加氢催化剂的开发和性能改进提供新的表征手段。The reaction kinetics of positronium ο-Ps on MoNi/Al2O3 hydrotreating catalyst was studied by using the positron annihilation spectroscopy for chemical analysis （PASCA） . It was known from the experimental results that, under the temperature range of 20-100℃ and vacuum 1 × 10^-5 Pa, the activation energy of ο-Ps on MoNi/Al2O3 catalyst was 11.09 kJ/mol, reaction frequency factor A was 1. 178 × 10^10 kg/（mol·s） and reaction rate constant K was 1. 344×10^8 kg/（mol·s）（25℃）, respectively, on the basis of which, the kinetic equation was set up. The experiments were also carried out for the catalysts with various metal loading on the same support, and it was found that the characteristic correlative coefficient （k） is only related with the characteristics of support, but had nothing to do with the kinds of loading metals. The change of MSI could be shown by the change of k, to give some inspiration to the development of better catalyst.

关 键 词：PASCA正电子素 载体 催化剂 反应动力学 

分 类 号：Q643[生物学—生物物理学]