CeO_2/SiO_2的制备及丁烯异构化动力学

Preparation of CeO_2/SiO_2 and Kinetics of Isomerization of Butene

用浸渍法制备CeO_2／SiO_2催化剂.催化剂灼烧温度在300－500℃时2－丁烯异构化活性保持一常数；600℃灼烧时活性下降,活载比在1／32－1／5范围内，随活载比增加催化剂活性呈线性增加．在2－丁烯分压较低时，t－2－丁烯及c－2－丁烯异构成1－丁烯的反应级数接近于一级．1－丁烯分压较大时1－丁烯异构成t－2－丁烯及c－2－丁烯的动力学服从于反应物、反应产物吸附的L－H动力学方程．用正交设计法估计动力学参数．1－丁烯、t－2－丁烯及c－2－丁烯吸附热的估计值与脉冲法测定值一致．

Catalysts, CeO2/SiO2, were prepared by the impregnated method. The activity of the catalysts at calcination temperattire of the catalysts in the range 300-500 ℃ was constant and decreased at 600℃. The catalystic activity in the range of ratio of CeO2 to SiO2, 1/5-1/32, increased linearly. The reaction order with respect to t-2-butene or c-2-butene was first prokimate1y at low partial pressuxes of t-2-butene or c-2-butene.At higher partial pressuxes of t-2-butene or c-2-butene the kinetics of isomerization of 1-butene obeys the L-H mechanism equation with adsorption of 1-butene, t-2-butene and c-2-butene. The kinetic paraxneters were estimated by the method of orthogonal design.The estimated values of adsorption of 1-butene, t-2-butene and c-2-butene are coincided with the experimental values by the pulse method.