载体对环戊二烯在负载型钯催化剂上选择加氢的作用

制备了几种负载型的钯加氢催化剂, 考察了它们对环戊二烯加氢反应动力学行为的影响。环戊二烯对环戊烯的加氢有抑制作用, 抑制作用的主要原因是环戊二烯的配位能力远大于环戊烯, 催化剂的载体通过其配体效应可以影响两者配位能力之比(K_D/K_E)和反应速度常数之比(k_2/k_4), 从而改变催化剂的选择性和活性。

Role of Carriers in the Selective Hydrogenation of Cyclopentadiene Over Supported Palladium Catalysts

Several supported palladium catalysts were prepared and thier effects on the kinetic behaviors in the selective hydrogenation of cyclopentadiene were studied. Experiments show that cyclopentadiene inhibits the hydrogenation of cyelopentene. Data based on kinetic analysis indicate that the coordination of cyclopentadiene is much stronger than that of eyclopentene which should be the main factor of this inhibition reaction. Catalyst carriers via thier ligand effects can influence the ratio of the coordination equilibrium constants K_D/K_E and the rate constants k_2/k_4, which in turn change the selectivities and activites of catalysts.