溴甲烷合成异丁烯催化剂的制备和表征  

Preparation and characterization of the catalysts for synthesis of isobutene from methyl bromide

作　　者：张信伟[1] 张舒东 李杰[1] 孙晓丹[1] 尹泽群[1] 刘全杰[1] 张喜文[1] 

机构地区：[1]中国石油化工股份有限公司抚顺石油化工研究院,辽宁抚顺113001

出　　处：《天然气化工—C1化学与化工》2016年第4期43-47,共5页Natural Gas Chemical Industry

基　　金：中国石油化工股份有限公(SH1413)

摘　　要：采用XRD、FTIR、BET、XRF、NH_3-TPD、XPS等表征手段研究了溴甲烷催化合成异丁烯的锌铝催化剂。结果表明:催化剂表面以弱酸中心为主,大部分ZnO物种高度分散在Al_2O_3载体的表面上,其余的ZnO以Al-O-Zn的方式进入了体相中形成ZnAl_2O_4结构。反应评价结果显示,常压、230℃下锌铝催化剂在2h内具有较好的活性,溴甲烷转化率接近100%,异丁烯选择性>82%;失活催化剂经再生后,反应2h内的活性与新鲜催化剂相当。The ZnO/Al2O3 catalysts for synthesis of isobutene from methyl bromide are prepared and characterized by XRD, FTIR, BET, XRF, NH3-TPD and XPS. The results show that the surfaces of catalysts are mainly dominated by weak acid centers; most of the ZnO species highly disperse on the surface of Al2O3; and the rest of ZnO are combined with Al2O3 to form ZnA1204. Under atmospheric pressure and 230℃, the ZnO/Al2O3 catalyst exhibited good activity in two hours with a CH3Br conversion of almost 100% and a isobutene selectivity of more than 82%. The activity of the regenerated catalyst was almost the same as the fresh catalyst.

关 键 词：溴甲烷 异丁烯 氧化锌 氧化铝 催化剂 酸性 

分 类 号：O643[理学—物理化学] TQ032[理学—化学]