摘要
采用溶胶-凝胶技术制备了超细N iO/SiO2-TiO2催化剂。条状预还原型催化剂的比表面积为350.5 m2.g-1,镍的质量分数为18.1%,堆积密度(0.70-0.75)g.cm-3。采用固定床连续流动微反装置研究催化剂上苯加氢气相反应的本征动力学。假设苯为非解离吸附,氢为解离吸附,在苯环上加上第一个氢原子为反应的控制步骤,由此导出的本征反应动力学方程与实验数据较吻合,平均相对偏差6.88%,并用方差检验法和Boudart准则验证了假设机理的合理性。由实验数据测得催化剂的本征反应活化能为22.60 kJ.mol-1,低于常规工业用苯加氢催化剂。
Ultra fine NiO/SiO2-TiO2 catalyst was prepared by sol-gel method. The reduced extrusion-shaped ultra fine NiO/SiO2-TiO2 catalyst had surface area of 350.5 m^2 · g^-1, nickel content of 18. 1wt% and bulk density of （0.70 -0.75 ） g·cm^-3. Kinetic behaviors of the catalyst for vapor-phase benzene hydrogenation was studied on a fixed bed micro-reactor. Assuming that benzene undergoes non-dissociative adsorption and hydrogen undergoes dissociative adsorption on the surface, and binding of the first hydrogen atom onto benzene is the determining step, an intrinsic kinetic equation was obtained which fit well with the experimental results, with average relative deviation of 6.88%. Rationality of the kinetic equation was verified by variance test and Boudart standard. Activation energy of the intrinsic reaction was obtained from the experimental data as 22.60 kJ ·mol^-1, lower than that of traditional commercial benzene hydrogenation catalysts.
出处
《工业催化》
CAS
2007年第1期33-37,共5页
Industrial Catalysis
基金
中国石化总公司资助项目(299020)
关键词
超细镍基
SIO2-TIO2
苯加氢
本征动力学
ultra fine nickel-based catalyst
benzene hydrogenation
intrinsic kinetic equation
