丁烯异构化活性与RE2O3／SiO2催化剂碱性的关系

以ＲＥ２Ｏ３／ＳｉＯ２（ＲＥ为Ｌａ、Ｐｒ、Ｓｍ、Ｅｕ、Ｇｄ、Ｔｂ、Ｄｙ、Ｈｏ、Ｅｒ、Ｔｍ或Ｙｂ）为催化剂，采用外循环流动无梯度反应器进行了１－丁烯异构化动力学的研究。结果表明，１－丁烯异构化动力学服从Ｌ－Ｈ机理方程，可近似地表示为一级速率方程。在不同的温度下催化剂的ＣＯ２吸附系数和吸附热用脉冲色谱法测定。在１－丁烯异构为反－２－丁烯、顺－２－丁烯的速率与催化剂的ＣＯ２校正比保留体积之间有较好的线性关系。还观察到ＲＥ２Ｏ３／ＳｉＯ２上ＣＯ２吸附的补偿效应。

RELATIONSHIP BETWEEN ACTIVITY OF ISOMERIZATION FOR BUTENE AND BASICITY OF RE 2O 3/SiO 2 CATALYSTS

The kinetics of isomerization of 1 butene over RE 2O 3/SiO 2(RE=La,Pr,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm or Yb)catalysts has been investigated by a flow recirculation gradientless reactor.The kinetics of isomerization for 1 butene obeyed the L H mechanism equation,which can be approximately expressed as the rate equation of first order reaction.The coefficients of adsorption for CO 2 at various temperatures and the heat of adsorption for CO 2 were determined by the pulse GC method.The good linear relationship at various temperatures between the rate of isomerization for 1 butene to trans 2 butene and the corrected retention volume of CO 2 for 1g catalyst,the rate of isomerization for 1 butene to cis 2 butene and the corrected retention volume of CO 2 for 1g catalyst over RE 2O 3/SiO 2 catalysts were obtained.The compensation effect of adsorption for CO 2 over the catalysts was also observed.