燃料化学学报2012，Vol.40Issue(10)：1230-1239,10.
含镓ZSM-5分子筛的制备及其在甲醇芳构化反应中的催化性能
Synthesis of gallium-containing ZSM-5 molecular sieves and their catalytic performance in methanol aromatization
摘要
Abstract
Gallium species were introduced into ZSM-5 molecular sieves through three different measures, I. E. Hydrothermal synthesis, impregnation, and ion exchange. The gallium-containing ZSM-5 molecular sieves were characterized by XRD, SEM, FT-IR, NH3-TPD, ICP, XPS and N2 sorption. The effects of silica source and the content and state of gallium species on their structure, acid property, and catalytic performance in the aromatization of methanol were investigated. The results indicated that the silica source (silica white, tetraethyl orthosilicate, and silica sol) exhibits significant effects on the crystal size and the state of gallium species, and thus influences the catalytic activity and stability of the gallium-containing ZSM-5 molecular sieves in methanol aromatization considerably. There are three kinds of gallium species, I. E. Framework Ga, Ga2O3 species on the crystal surface, and non-framework Ga species with strong interaction with the framework oxygen. The framework gallium species in the tetrahedral structure offers the acidic sites of the molecular sieves, while the non-framework gallium acts as the active sites for methanol aromatization. The proper amounts of non-framework gallium species matched with the acid sites can promote the formation of aromatics.关键词
甲醇芳构化/ZSM-5分子筛/硅源/Ga物种/Ga含量Key words
methanol aromatization/ ZSM-5 molecular sieves/ silica source/ Ga species/ Ga content分类
化学化工引用本文复制引用
苗青,董梅,牛宪军,王浩,樊卫斌,王建国,秦张峰..含镓ZSM-5分子筛的制备及其在甲醇芳构化反应中的催化性能[J].燃料化学学报,2012,40(10):1230-1239,10.基金项目
国家重点基础研究发展规划(973计划,2010CB234603,2011CB201403) （973计划,2010CB234603,2011CB201403）
国家自然科学基金(10979068,21003148,21103216). （10979068,21003148,21103216）
