文献类型：期刊文献

中文题名：以聚乙二醇为模板凝胶转化制备介孔ZSM-5沸石及其催化性能

英文题名：Mesoporous Zeolite ZSM-5 Synthesized via Gel Conversion with Polyethyleneglycol as Template and Its Catalytic Performance

作者：安建国[1];高翔[1];金军江[1];顾金楼[1];李亮[1];李永生[1];施剑林[1,2]

机构：[1]华东理工大学材料科学与工程学院,上海200237;[2]中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室,上海200050

年份：2015

卷号：30

期号：11

起止页码：1148

中文期刊名：无机材料学报

外文期刊名：Journal of Inorganic Materials

收录：CSTPCD;;EI(收录号：20155101706364);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000365633000004)】；北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；

语种：中文

中文关键词：介孔沸石;聚乙二醇;凝胶转化;一锅法

外文关键词：mesoporous zeolite; polyethyleneglycol; gel conversion; one-pot;

摘要：以聚乙二醇为介孔导向剂,通过凝胶转化制备了介孔ZSM-5沸石。研究表明,在TPA＋/Si O2=0.1时经过9~15 h溶剂挥发制得的凝胶,在160℃处理24 h可得到介孔ZSM-5沸石;挥发时间太短或太长会得到纯的ZSM-5沸石或介孔材料,说明在凝胶的制备过程中,通过控制溶剂的挥发程度,既可为沸石生长过程提供所需的水分,又能避免沸石晶体形成过程中无定型相的产生,从而在较低的TPA＋浓度下获得介孔ZSM-5沸石。与传统的ZSM-5沸石相比,利用该方法制备的介孔ZSM-5沸石不仅具有微孔/介孔多级孔结构,同时具有沸石材料较强的酸性、较高的水热稳定性和择形催化性能,使其在苯甲醛与正丁醇的大分子醇醛缩聚反应中能有效地克服传统沸石孔径限制的缺点,收率高达42.4%。
A simple strategy for synthesizing mesoporous zeolite ZSM-5 via gel conversion was successfully developed with polyethyleneglycol as mesopore directing agent. It is revealed that the gel obtained after 9–15 h evaporation of solvents could be transferred into mesoporous ZSM-5 zeolite after treatment at 160℃ for 24 h. However, pure ZSM-5 zeolite or mesoporous silica was achieved with too short or too long evaporation periods. The results indicate that the gelation process through solvent evaporation controls the hierarchical structure formation kinetically, which not only provides an appropriate amount of water for zeolite crystallization, but also prevents the phase-separation between zeolite and amorphous phases. Due to the introduction of the mesoporosity of several tens of nanometers in size, this hierarchical micro/mesostructured zeolite exhibits enhanced catalytic activities in the large molecules involved reactions, including aldol condensation of benzaldehyde with n-butyl alcohol and Pechmann reaction of resorcinol with ethylacetoacetate.