摘要
对自制的MWW分子筛催化剂与国外催化剂进行了结构和催化性能的比较。通过XRD,SEM,FT-IR,^(29)Si MAS NMR,PSD,BET等表征,发现MWW分子筛为典型的MCM-22分子筛,具有平均直径约4μm的薄饼状形貌。与国外WBZ-1催化剂相比,MWW分子筛的比表面积和B酸/L酸中心之比略高,而骨架Si/Al比和机械强度略低。通过苯/低含量乙烯烷基化制乙苯反应性能的研究,发现MWW分子筛催化剂比国外WBZ-1催化剂表现出更好的催化性能,具有更高的乙烯转化率和乙苯选择性以及更好的催化稳定性。在反应温度230℃、反应压力2.5 MPa、苯体积空速5 h^(-1)、苯/乙烯摩尔比4.5的条件下,MWW分子筛催化剂上乙烯转化率平均为97.1%,乙苯选择性平均为95.3%,乙基化选择性平均为99.5%,并且在反应运行1 000 h以上时仍能维持良好的催化反应性能。
A comparitive study of the structure and catalytic performance between self-made MWW catalyst and an imported reference catalyst WBZ-1 was carried out. The catalysts were characterized by means of XRD, SEM, FT-IR, 29 Si MAS NMR, PSD and BET. The results showed that MWW catalyst exhibited typical MCM-22 structure and with a morphology of pancake having an average diameter of 4μm. As compared with the imported reference catalyst, MWW catalyst possessed higher specific surface area and B/L acid sites ratio, but a smaller framework Si/Al ratio and mechanical strength. The catalytic performance of these catalysts for the synthesis of ethylbenzene from benzene and dilute ethene was evaluated and the results showed that the MWW catalyst was more active and selective than the WBZ-1 catalyst. Under the conditions of a reaction temperature of 230℃, a pressure of 2.5 MPa, a LHSV（benzene）of 5 h-1 and a benzene to ethene molar ratio of 4.5 ,the average conversion of ethene over MWW catalyst was 97. 1%, the average selectivity to ethylbenzene was 97. 3% and good catalytic performance could be maintained after running over 1 000 h.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2009年第7期6-9,共4页
Petroleum Processing and Petrochemicals
基金
2006年天津市重点科技攻关培育项目(06YFGPGX08100)
2007年中国海洋石油总公司技术发展项目(C/KJFZHJTJY 001 2007)
2007年天津市应用基础研究计划项目(07JCYBJC01000)
关键词
分子筛
催化剂
苯
乙烯
烷基化反应
乙苯
molecular sieve
catalyst
benzene
ethylene
alkylation reaction
ethyl benzene
