Aggregates of superfine ZSM-5 crystals: The effect of NaOH on the catalytic performance of methanol to propylene reaction

被引：54

作者：

Chen, Hengbao ^{[1
]}

Wang, Yaquan ^{[1
]}

Meng, Fanjun ^{[1
]}

Sun, Chao ^{[1
]}

Li, Hongyao ^{[1
]}

Wang, Zhao ^{[1
]}

Gao, Fei ^{[1
]}

Wang, Xiao ^{[1
]}

Wang, Shuhai ^{[1
]}

机构：

[1] Tianjin Univ, Sch Chem Engn & Technol, Key Lab Green Chem Technol, Minist Educ, Tianjin 300072, Peoples R China

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2017年 / 244卷

基金：

中国国家自然科学基金;

关键词：

Superfine ZSM-5; CTAB; Seed; NaOH; MTP; SEED-INDUCED SYNTHESIS; MESOPOROUS ZSM-5; NANOCRYSTALLINE ZSM-5; DIRECTING AGENT; ZEOLITE; CRYSTALLIZATION; CONVERSION; SELECTIVITY; CRACKING; HZSM-5;

D O I：

10.1016/j.micromeso.2017.02.014

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Loose aggregates of superfine ZSM-5 crystals (S-ZSM-5) were synthesized by a seed-induced method in the presence of cetyltrimethylammonium bromide (CTAB), characterized by XRD, SEM, N-2 adsorption and desorption, XRF, NH3-TPD, Al-27 MAS NMR, TG analysis, FTIR and TEM, and studied for the methanol to propylene (MTP) reaction. The results showed that CTAB played a curial role in the formation of SZSM-5 zeolites: NaOH concentration had a significant effect on the textural properties of S-ZSM-5 zeolites, with the morphology being controllable from cuboid to sphere by varying the NaOH/SO2 ratios from o to 0.27. Compared with the catalysts synthesized by the conventional seed-induced method without CTAB, all S-ZSM-5 catalysts showed much higher stability and higher propylene selectivity in the MTP reaction. The excellent catalytic performance can be attributed to the aggregates of superfine ZSM-5 crystals with abundant mesopores and more weak acid sites, which hinder various side reactions such as hydrogen-transfer reactions. (C) 2016 Elsevier Inc. All rights reserved.

引用

页码：301 / 309

页数：9

共 54 条

[1] METHANOL CONVERSION TO OLEFINS OVER ZSM-5 .1. EFFECT OF TEMPERATURE AND ZEOLITE SIO2/AL2O3 [J].