卤化钠对ZSM-5分子筛合成及其催化甲醇制丙烯反应性能的影响  

INFLUENCE OF SODIUM HALIDES ON SYNTHESIS OF ZSM-5 AND ITS CATALYTIC PERFORMANCE FOR MTP

作　　者：张洪菡 张善鹤 李春义[1] Zhang Honghan;Zhang Shanhe;Li Chunyi(State Key Laboratory of Heavy Oil Processing,China University of Petroleum(East China),Qingdao,Shandong 266580)

机构地区：[1]中国石油大学(华东)重质油国家重点实验室,山东青岛266580

出　　处：《石油炼制与化工》2018年第2期23-28,共6页Petroleum Processing and Petrochemicals

基　　金：国家重点基础研究发展规划项目(973计划;2012CB215006)

摘　　要：在极浓体系下,通过添加卤化钠NaX(X为F,Cl,Br)合成了一系列ZSM-5分子筛,采用SEM、TEM、XRF、N2吸附-脱附、Py-FTIR和NH3-TPD对合成样品进行表征,在常压、温度为723K、质量空速为9.78h^(-1)的条件下,通过微型固定床反应器评价催化剂对甲醇制丙烯(MTP)反应的催化性能。结果表明:NaX的添加能够提高ZSM-5分子筛的MTP催化性能;合成的NaBr-ZSM-5分子筛具有较好的MTP催化活性;添加NaF和NaBr能够合成纳米ZSM-5聚集体,NaBrZSM-5分子筛的一次纳米晶粒更小,介孔体积更大;较大的外比表面积和较大介孔体积有利于提高MTP反应的催化活性。In extremely concentrated system,a series of ZSM-5 zeolites were synthesized by adding Na halides,NaX(X=F,Cl,Br)and characterized by SEM,TEM,N 2 adsorption-desorption,Py-FTIR and NH 3-TPD.Their catalytic properties for MTP were tested in a fixed-bed micro-reactor under the conditions of atmosphere pressure,723 K and WHSV 9.78 h-1.The results showed that the addition of NaX improves the activities of ZSM-5 zeolites for MTP,among which NaBr-ZSM-5 zeolite exhibites the best performance;the nano-sized ZSM-5 aggregates can be obtained by adding NaF and NaBr,while NaBr-ZSM-5 zeolite has the smallest nanocrystal size with larger mesopore volume and external surface area,which is helpful to improve the activity for MTP reaction

关 键 词：卤化钠 极浓体系 ZSM-5分子筛 纳米级 甲醇制丙烯 

分 类 号：TQ221.212[化学工程—有机化工] TQ426