β沸石催化剂上丙烯水合醚化反应的原位红外光谱研究  

In-Situ FT-IR Studies on Propene Hydration-Etherification Catalyzed by β Zeolite

作　　者：刘金龙[1] 王国良[1] 沙颖逊[2] 杨少锋[2] 殷元骐[1] 

机构地区：[1]中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室,甘肃兰州731000 [2]中国石油化工股份有限公司洛阳石油化工工程公司炼制研究所,河南洛阳471003

出　　处：《催化学报》2002年第2期105-108,共4页

摘　　要：采用原位红外光谱技术 ,对 β沸石催化剂上的丙烯水合醚化反应过程进行了研究 ,并结合催化剂的表面酸性进行了讨论 .丙烯水合及异丙醇脱水反应主要在催化剂的B酸中心上进行 ,而丙烯与异丙醇的醚化反应则主要依赖于催化剂的L酸中心 .对于丙烯水合醚化反应 ,催化剂必须具有一定量的B酸中心 ,合适的B酸 /L酸比例是催化剂同时具有高活性和高二异丙醚 (以下简称异丙醚 )Propene hydration etherification reaction catalyzed by β zeolite was studied by using in situ FT IR technique, and the effects of surface acidity on the reaction were discussed. Catalyst A (unmodified β zeolite) is active for the reactions of propene hydration, isopropanol dehydration as well as etherification of propene with isopropanol. Catalyst B (boron modified β zeolite) only shows high activity in etherification of propene with isopropanol. It was indicated that the reactions of propene hydration and isopropanol dehydration are carried out at B acid sites, while the etherification of propene with isopropanol is carried out at L acid sites. The B acid sites of the catalyst is necessary for propene hydration reaction. A suitable ratio of B/L is a key factor for preparing a catalyst with high activity and high selectivity for diisopropyl ether.

关 键 词：原位红外光谱 Β沸石 氧化硼 丙烯 水合醚化 二异丙醚 催化剂 表面酸性 汽油添加剂 催化活性 

分 类 号：O643.3[理学—物理化学]