ZSM-5凝胶体系硅铝比对SAPO-34/ZSM-5复合分子筛结构性质的影响  

Effect of silicon to aluminum ratio of parent ZSM-5 gel on structure properties of SAPO-34/ZSM-5 composite zeolite

作　　者：许争[1,2] 林倩[1,3] 潘红艳[1] 曹建新[1,3] 刘飞[1,2] 

机构地区：[1]贵州大学化学与化工学院,贵州贵阳550025 [2]贵州省矿产资源高效利用与绿色化工技术特色重点实验室,贵州贵阳550025 [3]贵州省绿色化工与清洁能源技术重点实验室,贵州贵阳550025

出　　处：《应用化工》2017年第7期1281-1284,共4页Applied Chemical Industry

基　　金：国家自然科学基金项目(21666007)

摘　　要：采用微波水热包覆法制备SAPO-34/ZSM-5复合分子筛。考察了ZSM-5凝胶体系硅铝摩尔比对复合分子筛微观结构和物化性质的影响,采用XRD、SEM、BET、NH_3-TPD等手段对合成的复合分子筛微观结构、形貌、孔结构及表面酸性质等进行分析表征。结果表明,ZSM-5凝胶体系硅铝比对复合分子筛样品晶相组成影响较小,但对样品比表面积、孔结构参数及表面酸性质影响较大。硅铝比为150时,SAPO-34/ZSM-5复合分子筛具有包裹状特殊晶体结构及多级孔(微孔孔容0.21 cm^3/g、介孔孔容0.09 cm^3/g)和弱酸中心(0.209 mmol/g)独特物化性质。The SAPO-34/ZSM-5 composite zeolite has been synthesized via microwave hydrothermal coating method,and the effect of silicon to aluminum ratio（ molar ratio） of parent ZSM-5 gel on microstructure and physicochemistry characteristics of SAPO-34/ZSM-5 composite zeolite was investigated. The microstructure,morphology,pore structure and the surface acid nature of the composite zeolite were characterized by using XRD,SEM,BET and NH3-TPD techniques. The results indicated that the silicon to aluminum ratio of parent ZSM-5 gel posed little impact on crystalline phase composition,but had a significant influence on the specific surface area,pore structure parameters and surface acidity of the synthesized composite products. When silicon to aluminum ratio was 150,the SAPO-34/ZSM-5 composite zeolite exhibits a distinct morphology of cladding crystal and novel physicochemistry characteristics of hierarchical pore（ microporous volume 0. 21 cm^3/g and mesoporous volume 0. 09 cm^3/g） and a large amount of weak acid sites（ 0. 209 mmol/g）.

关 键 词：SAPO-34/ZSM-5 复合分子筛 ZSM-5凝胶体系 硅铝比 结构性质 

分 类 号：TQ426.64[化学工程]