MCM-22分子筛的甲醇制丙烯反应催化性能  

CATALYTIC ACTIVITY OF MCM-22 MOLECULAR SIEVE IN METHANOL-TO-PROPENE REACTION

作　　者：吕宝成[1] 于爱敏[1] 戴卫理[1] 武光军[1] 章福祥[1] 关乃佳[1] 

机构地区：[1]南开大学化学学院新催化材料科学研究所,天津300071

出　　处：《石油学报（石油加工）》2008年第B10期260-263,共4页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家重点基础研究发展计划“973”项目（2003CB615801）资助

摘　　要：目前丙烯市场供不应求，加上制备丙烯是以石油为原料，石油紧缺和价格大幅度上涨使得以煤为原料的甲醇制丙烯（MTP）研究变得格外重要。MCM-22分子筛具有独特的结构特征，与通用的SAPO-34（MTO）和HZSM-5（MTP）分子筛不同，在MTP反应中丙烯选择性初始时为零，随着反应时间的增加，积炭逐渐增加，覆盖了部分酸性中心，同时对孔道有-定的修饰作用，因而使得丙烯选择性逐渐增加，并且在反应6h后达到稳定值23％。通过负载P可以有效调变HMCM-22分子筛的酸性，使其丙烯选择性明显提高，负载2．5％P的HMCM-22在反应初始阶段丙烯选择性可以达到22％，并且随反应时间的延长逐渐升高，在反应4h后其丙烯选择性可以稳定在34％以上。同时，P的负载还可以有效抑制反应中积炭的生成。Research on production from methanol to propene （MTP）, based on coal raw material, is becoming much more attractive because of the lack of crude oil in the market and its dramatically price rising. MCM-22 molecular sieve has a potential application for the MTP reaction dne to its special structure. Being different from the traditional MTO/MTP catalysts such as SAPO-34 and HZSM-5, the selectivity of the propene was zero on MCM-22 in the initial time of reaction, and with the time on stream increase, the selectivity of propene up to 23% after 6 h, in which the acidity and pore structure may be modified by strong carbon deposit . The acidity of MCM-22 can also be modified by P loading, which could increase the selectivity of propene in some way. 2.5% P loaded MCM-22 had a very considerable selectivity of propene, which was from 22% at the beginning up to 34% in the stable phase, Furthermore, the P-loading sample can restrain the carbon deposit to some extent.

关 键 词：甲醇 MTP 丙烯选择性 MCM-22 

分 类 号：TQ424.25[化学工程] O623.121[理学—有机化学]