Promoting di-isobutene selectivity over ZnO/ZrO_(2)-SO_(4) in isobutene oligomerization  

作　　者：Jiyuan Li Mifen Cui Zhuxiu Zhang Xian Chen Qing Liu Zhaoyang Fei Jihai Tang Xu Qiao 

机构地区：[1]State Key Laboratory of Materials-Oriented Chemical Engineering,College of Chemical Engineering,Nanjing Tech University,Nanjing 210009,China [2]Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM),Nanjing 210009,China

出　　处：《Chinese Journal of Chemical Engineering》2021年第10期165-171,共7页中国化学工程学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(21676141,21808104);the National Key Research and Development Program of China(2017YFB0307304);the Natural Science Foundation of Jiangsu Province(BK20170989);the Natural Science Foundation of Jiangsu Higher Education Institutions of China(17KJB530005);the Project"333"of Jiangsu Province(BRA2016418);the Six Major Talent Peak Project of Jiangsu Province(XCL-017)。

摘　　要：Isooctane attracts great interest in recent years because of its promising potential as friendlyenvironmental gasoline,which is obtained by dimerization of isobutene with a hydrogenation step.Herein,a solid acid catalyst sulfated zirconia modified by ZnO was prepared.The oligomerization of isobutene had been investigated over ZrO_(2)-SO_(4) and ZnO(X)/ZrO_(2)-SO_(4) catalyst in order to find efficient catalysts for the production of isobutene oligomers.The presence of ZnO obviously enhanced the dimerization of isobutene and ZnO(X)/ZrO_(2)-SO_(4) exhibited the highest di-isobutene yield of 60%.Kinetic studies showed the higher trimerization-to-dimerization activation energy ratios of ZnO(X)/ZrO_(2)-SO_(4) than those of ZrO_(2)-SO_(4) from 353 to 393 K.In addition,reaction rate of dimerization was higher than trimerization over ZnO(X)/ZrO_(2)-SO_(4).The high L/B ratio manifested the capability to enhance the selectivity of C8 in isobutene dimerization.Furthermore,ZnO(X)/ZrO_(2)-SO_(4) exhibited stable conversion for the dimerization of isobutene.

关 键 词：Sulfated zirconia Zinc oxide ISOBUTENE SELECTIVITY Chemical reaction CATALYSIS 

分 类 号：TQ316.3[化学工程—高聚物工业] TQ426