燃料化学学报2012，Vol.40Issue(5)：583-588,6.
TPAOH/NaOH混合碱体系对ZSM-5沸石的改性及其催化性能研究
Modification and catalyst performance of ZSM-5 zeolite by treatment with TPAOH/NaOH mixed alkali
摘要
Abstract
The composites with mesoporous and microporous structure were obtained by treatment of ZSM-5 zeolite in mixed alkali aqueous solution of tetrapropylammonium hydroxide and inorganic base NaOH. The products were characterized by XRD, N2-adsorption/desorption, NH3-TPD, SEM and so on. The results showed that the alkaline solution would cause the zeolite desilication and dealumination and either decreasing the TPA+/OH- ratio or prolonging the alkali treatment time will cause reduction of micropore structure and increasement of mesopore amount increasingly while keeping the concentration of OH- at a fixed value. And meanwhile, the treatment also changed the acidity of zeolite. Mixed alkali treatment with proper TPA+/OH- ratio could preserve micropore structure to the maximum extent while formed the mesopore, reduce zeolite Vs strong acid quantity and increase the selectivity of propylene when performanced on methanol-to-olefins ( MTO) reaction. Compared with the inorganic base NaOH, the modification rate of zeolite by TPAOH was slower, milder and more controllable that could act as pore-growth moderator.关键词
介孔/沸石/ZSM-5/碱处理/MTOKey words
mesopore/zeolite/ZSM-5/alkali treatment/MTO分类
化学化工引用本文复制引用
李莎,李玉平,狄春雨,张鹏飞,潘瑞丽,窦涛..TPAOH/NaOH混合碱体系对ZSM-5沸石的改性及其催化性能研究[J].燃料化学学报,2012,40(5):583-588,6.基金项目
国家重点基础研究发展规划(973计划,2004CB217806) （973计划,2004CB217806）
国家自然科学基金(20973123). （20973123）
