论文部分内容阅读
应用动态分析方法考察了噻吩在Mo/Al_2O_3、Mo/SiO_2、Mo/TiO_2三种催化剂上的吸附和表面反应速率常数,实验结果表明:(1)载体对吸附和反应性能都有影响,其中对吸附影响更加突出。在任一载体上,K_A·k_r/k_a远小于1,表面反应是噻吩氢解的速率控制步骤,而吸附是平衡的;(2)由MoO_3载量对K_A及K_r的影响推测,对Mo/Al_2O_3催化剂,噻吩主要吸附于载体上,而氢解反应则发生在金属Mo上;对Mo/SiO_2催化剂,则吸附和反应都发生在Mo上;(3)用动态分析方法按两步反应机理获得的载体对K_p的影响规律与稳态法结果基本一致。
The dynamic adsorption of thiophene on Mo / Al_2O_3, Mo / SiO_2 and Mo / TiO_2 catalysts was investigated by dynamic analysis. The experimental results show that: (1) The support has the effect on both adsorption and reactivity Adsorption more prominent. The K_A · k_r / k_a is far less than 1 in any carrier, and the surface reaction is the rate control step of thiophene hydrogenolysis, while the adsorption is in equilibrium. (2) The effect of MoO_3 loading on K_A and K_r is presumed. For Mo / Al_2O_3 The catalyst, thiophene is mainly adsorbed on the support, while the hydrogenolysis reaction occurs on the metal Mo. For the Mo / SiO 2 catalyst, the adsorption and the reaction occur on Mo. (3) The dynamic analysis method is based on the two-step reaction mechanism The influence of vector on K_p is basically the same as that of steady state.