摘要
以自制的HMCM-22作为原料,与中孔分子筛MCM-41的凝胶在水热条件下进行组装得到HMCM-22/MCM-41中微孔复合分子筛,采用XRD、N2吸附-脱附及NH3-TPD等方法对合成样品进行表征。结果表明,合成的样品同时具有中孔分子筛MCM-41与微孔分子筛HMCM-22的特点。采用固定床微型连续流反应器对HMCM-22/MCM-41复合分子筛催化甲苯与碳酸二甲酯(DMC)的烷基化反应性能进行了评价,考察了反应温度、甲苯与DMC摩尔配比及空速对烷基化反应的影响。实验发现,HMCM-22/MCM-41催化甲苯DMC烷基化反应的产物中,对二甲苯的选择性远高于间位和邻位异构体的选择性,表现出良好的催化活性和选择性。
HMCM-22/MCM-41 composite molecular sieves with mesoporous and microporous structure were prepared under hydrothermal conditions from HMCM-22.Physicochemical properties of the as-synthesized catalysts were characterized by XRD,N2 adsorption-desorption and NH3-TPD.Results showed the existence of well-structured microphase MCM-22 zeolite and mesophase MCM-41 in the composite materials.Selective alkylation of toluene with dimethyl carbonate （DMC） was carried out over HMCM-22/MCM-41 composite molecular sieves in a fixed-bed flow reactor.Effects of reaction conditions on the alkylation of toluene with DMC were investigated.The selectivity to p-xylene was higher than m- and o-isomers over HMCM-22/MCM-41 which exhibited good catalytic activity and selectivity.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2010年第5期875-879,共5页
Chemical Industry and Engineering Progress
基金
江苏省高技术研究(BG2006015)
江苏省高校重大基础研究(06KJA5013)资助项目
