高浓度体系小晶粒B改性ZSM-5分子筛的制备及甲醇制丙烯催化性能  

High Concentration Synthesis of Small Crystal B-modified ZSM-5 Zeolites and Their Catalytic Performance for Methanol to Propylene Reaction

作　　者：安良成 江永军[1] 王林[1] 苏慧[1] 颜蜀儁 张伟[1] 雍晓静[1] 罗春桃[1] 

机构地区：[1]神华宁夏煤业集团有限责任公司煤炭化学工业分公司,宁夏银川750411

出　　处：《分子催化》2016年第1期10-19,共10页Journal of Molecular Catalysis(China)

基　　金：国家自然科学基金国际(地区)合作与交流(批准号:2015DFA40660)项目资助~~

摘　　要：在高浓度体系(n(H2O)∶n(Si O2)<4)下,以粗孔硅胶和偏铝酸钠为原料,TPABr为模板剂,水热晶化法制备了小晶粒B改性ZSM-5分子筛,单釜产率达50%以上.采用XRD、FT-IR、SEM、NH3-TPD、XRF、N2物理吸附等方法对其结构进行了表征,评价了其在甲醇制丙烯(MTP)反应中的催化性能.结果表明,制备的小晶粒B改性ZSM-5分子筛粒度分布均匀,粒径约500 nm.在MTP反应中,B改性的样品比未改性样品含有更多的弱酸位,表现出更好的的活性、选择性和稳定性,其中n(Al2O3)∶n(B2O3)=1∶1的样品效果最好,甲醇转化率在95%以上运行476h,丙烯平均选择性46.32%.Small crystal of B-modified ZSM-5 zeolites were synthesized by hydrothermal crystallization method and using macroporous silica gel and sodium aluminate as raw materials and TPABr as template. The batch yield was a bove 50%. The samples were characterized by XRD,FT-IR,SEM,NH3-TPD,XRF and nitrogen adsorption,and their catalytic performance for methanol to propylene（ MTP） reaction was evaluated. The synthesized samples had uniform particle size distribution and the particle sizes were about 500 nm. In MTP process,the synthesized B-modified samples exhibited good activity,selectivity and stability,and the best sample was n（ Al2O3）∶ n（ B2O3）= 1∶1,whose methanol conversion maintained above 95% and the selectivity to propylene remained about 46. 23% even after running for 476 h.

关 键 词：高浓度体系 小晶粒 B改性 ZSM-5 甲醇制丙烯 

分 类 号：O643.32[理学—物理化学]