石油化工2016，Vol.45Issue(4)：415-421,7.DOI:10.3969/j.issn.1000-8144.2016.04.007
碱酸联合处理H-ZSM-5沸石多级孔改性
Hierarchical mesoporous modification of H-ZSM-5 zeolites via sequential alkali and acid treatments
摘要
Abstract
H-ZSM-5 zeolite with silica-alumina ratio of 47 was prepared by hydrothermal synthesis and ion exchange. Its mesoporous modification was conducted through sequential hydrothermal alkali pre-etching,bulk alkali leaching,acid leaching and ion-exchange. The effects of the sequential treatment process and alkali pre-etching temperature on the mesoporous formation,pore size distribution and textural properties of the modified zeolites were investigated by means of XRD, N2 adsorption-desorption,FTIR,SEM and TEM. The results indicated that the modified zeolites showed relatively high specific surface area,mesoporosity and mesopore-size distribution and kept the framework structure of the H-ZSM-5 zeolite well. The hydrothermally alkali pre-etching temperature rise led to decreasing their microporous volume,specific surface area,relative crystallinity and mass yield,and the incremental specific surface area from 38%to 34%. At the same time,the ratio of mesoporous volume to total micro-and mesoporous volume were kept more than 70%. When the hydrothermal alkali pre-etching temperature was at 358 K,the mesoporous specific surface area and volume of sample HZ-2 were maximum,209.8 m2/g and 0.295 cm3/g,respectively,while the total micro-and mesoporous volume was 0.364 cm3/g.关键词
H-ZSM-5沸石/碱酸处理/多级孔材料/介孔率/介孔分布Key words
H-ZSM-5 zeolites/alkali-acid treatment/hierarchical porous material/mesoporosity/mesopore-size distribution分类
化学化工引用本文复制引用
王超,韩静宇,王洪涛,张莉,戴咏川,金英杰..碱酸联合处理H-ZSM-5沸石多级孔改性[J].石油化工,2016,45(4):415-421,7.基金项目
国家自然科学基金项目（21171083）。 （）
