还原介质和还原温度对Ru-Zn催化苯选择加氢制环己烯性能的影响

发布时间：2018-04-21 16:25

  本文选题：苯 + 加氢　； 参考：《化工进展》2017年08期

【摘要】：用共沉淀法分别在5%NaOH溶液、蒸馏水、0.035mol/L ZnSO_4溶液和0.145mol/L ZnSO_4溶液中用H_2还原制备了Ru-Zn(5%NaOH)催化剂、Ru-Zn(H_2O)催化剂、Ru-Zn(0.035mol/L ZnSO_4)催化剂和Ru-Zn(0.145mol/L ZnSO_4)催化剂。结果表明,它们催化苯选择加氢制环己烯的活性高低顺序为Ru-Zn(5%NaOH)催化剂Ru-Zn(H_2O)催化剂Ru-Zn(0.035mol/L ZnSO_4)催化剂≈Ru-Zn(0.145mol/L ZnSO_4)催化剂,环己烯选择性高低顺序与活性顺序正好相反。因为还原介质可以影响Ru-Zn催化剂的组成和织构性质,进而影响它的催化性能。Ru-Zn(H_2O)催化剂的环己烯收率最高,说明蒸馏水作还原介质最好。随还原温度升高,Ru-Zn(H_2O)催化剂比表面积逐渐减小,催化剂活性逐渐降低。同时粒径逐渐增大,Ru粒子上有利于环己烯加氢生成环己烷的楞位和顶点位减少,环己烯选择性升高。在100℃还原温度下制备的Ru-Zn(H_2O)催化剂的环己烯收率可达58.1%。
[Abstract]:Ru-ZnN ~ (5 +) H _ 2O) catalyst Ru-ZnN _ 2O _ (0.035 mol / L ZnSO4) and Ru-Zn(0.145mol/L ZnSO _ (4) were prepared by co-precipitation method in 5%NaOH solution, distilled water (0.035 mol / L ZnSO_4) solution and 0.145mol/L ZnSO_4 solution by H _ (2) reduction. The results show that the order of their catalytic activity for selective hydrogenation of benzene to cyclohexene is Ru-ZnN _ 5NaOH) catalyst Ru-ZnN _ H _ 2O) catalyst Ru-Zn(0.035mol/L _ ZnSO _ 4)) catalyst 鈮，

本文编号：1783193