多级孔ZSM-5分子筛的合成及其在甲醇脱水制二甲醚反应中的应用(英文)  

Hierarchical mesoporous ZSM-5 for the dehydration of methanol to dimethyl ether

作　　者：杨琦[1] 张海涛 孔猛[1] 包秀秀[1] 费金华[1] 郑小明[1] 

机构地区：[1]浙江大学催化研究所,浙江省应用化学重点实验室,浙江杭州310028 [2]中国石油兰州化工研究中心,甘肃兰州730060

出　　处：《催化学报》2013年第8期1576-1582,共7页

基　　金：supported by the National Basic Research Program of China (973 Program,2007CB210207,2013CB228104);the High Technology Research and Development Program of China (863 Program,2007AA05Z415)~~

摘　　要：以四丙基氨为微孔模版剂, 阳离子高分子聚合物为介孔模版剂, 合成了具有多级介孔的ZSM-5分子筛, 并用于甲醇气相脱水合成二甲醚. 结果表明, 加入阳离子高分子聚合物后, 合成的HZSM-5分子筛样品既保持了其MFI典型结构, 又呈现了多级介孔特征; 随着阳离子高分子聚合物模板剂加入量的增加, 其多级介孔特征更为明显. 具有多级介孔的HZSM-5分子筛表现出比常规微孔HZSM-5分子筛高的反应稳定性和二甲醚选择性, 这主要是由于其织构和酸性的双重作用.Hierarchical mesoporous ZSM‐5 zeolites were synthesized using small organic cations of tetrapropylammonium and meso‐sized cationic polymers of dimethyldiallyl ammonium chloride acrylamide copolymer as templates.The zeolites were used for the dehydration of methanol to dimethyl ether（DME）.Characterization results showed that the basic MFI‐type structure was still obtained after adding the cationic polymers,while their nitrogen isotherms exhibited a broad hysteresis loop at relative pressures higher than 0.4,which proved the presence of mesopores.The mesoporosity of the hierarchical mesoporous ZSM‐5 can be adjusted simply by adding different amounts of the cationic polymer.Catalytic tests showed that the hierarchical mesoporous HZSM‐5 zeolites exhibited better stability than conventional HZSM‐5 and excellent DME selectivity.The activity for methanol dehydration strongly depended on the textural property and acidity of the catalyst.

关 键 词：多级孔 HZSM-5分子筛 表面酸性 甲醇脱水 二甲醚 

分 类 号：O643.32[理学—物理化学]