沸石
催化作用
甲醇
ZSM-5型
复合数
介孔材料
解吸
溴化物
化学工程
吸附
扫描电子显微镜
化学
二甲醚
选择性
材料科学
无机化学
有机化学
复合材料
工程类
作者
Xiao Wang,Fanjun Meng,Hengbao Chen,Fei Gao,Yaquan Wang,Xinpeng Han,Chunyang Fan,Chao Sun,Shuhai Wang,Li Wang
标识
DOI:10.1016/j.crci.2017.10.004
摘要
A hierarchical ZSM-11/5 composite zeolite with a high SiO 2 /Al 2 O 3 ratio was successfully synthesized using a seed-induced method in the presence of cetyltrimethylammonium bromide, characterized by scanning electron microscopy, X-ray diffraction, X-ray fluorescence, 27 Al NMR, 27 Si NMR, N 2 physical adsorption, and temperature-programmed desorption of ammonia, and studied in the frame of the methanol-to-olefins reaction. The results show that the amount of seed added plays a pivotal role in the formation of hierarchical ZSM-11/5 composite zeolite. With an increase in the amount of seed, the composite zeolite exhibits excellent catalytic performance in the methanol-to-olefins reaction, which can be attributed to the higher specific surface areas, higher external surface areas, more mesopore volumes, and more acid sites than ZSM-11 synthesized by the conventional method with tetrabutylammonium ions as a template. Contrary to the conventional point of view, the addition of too much seeds results in a dramatic decrease in the catalytic performance, which is ascribed to the higher proportion of ZSM-5 in the ZSM-11/5 composite zeolite.
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