Seed-Assisted Synthesis and Catalytic Performance of Nano-sized ZSM-5 Aggregates in a One-Step Crystallization Process

被引：6

作者：

Wang, Ziyang ^{[1
,2
]}

Wang, Yaquan ^{[1
,2
]}

Sun, Chao ^{[1
,2
]}

Zhao, Aijuan ^{[1
,2
]}

Wang, Cui ^{[1
,2
]}

Zhang, Xu ^{[1
,2
]}

Zhao, Jingjing ^{[1
,2
]}

Zhao, Taotao ^{[1
,2
]}

Liu, Wenrong ^{[1
,2
]}

Lu, Jiaxin ^{[1
,2
]}

Wu, Shuhui ^{[1
,2
]}

机构：

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

[2] Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China

来源：

TRANSACTIONS OF TIANJIN UNIVERSITY | 2020年 / 26卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Hierarchical ZSM-5; Nano-sized aggregates; Seed-assisted; CTAB; Toluene alkylation with methanol; HIERARCHICAL ZSM-5; TOLUENE ALKYLATION; BENZENE ALKYLATION; CRYSTAL SIZE; METHANOL; ZEOLITE; HZSM-5; CETYLTRIMETHYLAMMONIUM; METHYLATION; SELECTIVITY;

D O I：

10.1007/s12209-019-00223-w

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Hierarchical nano-sized ZSM-5 aggregates were successfully synthesized via a seed-assisted method in the presence of cetyltrimethylammonium bromide (CTAB) through a facile one-step crystallization process. Commercial ZSM-5 zeolites with a SiO2/Al2O3 ratio comparable to that of ZSM-5 products were treated with alkali and used as the seed particles. The influences of crystallization conditions were investigated, and the possible synthesis mechanism was proposed. ZSM-5 zeolites with different amounts of CTAB added were characterized using many techniques and evaluated in toluene alkylation with methanol. The results showed that a trace amount of CTAB significantly promoted the crystallization of ZSM-5 zeolite, with the morphology changing from hexagonal-shape crystals to uniform spherical aggregates. CTAB may act as the structure-directing agent and assemble the primary crystallites to generate hierarchical ZSM-5 aggregates. The ZSM-5 zeolite with the smallest primary particles of 50-80 nm exhibited large specific surface area, abundant mesopores, and the greatest microporosity. The hierarchical nano-sized ZSM-5 aggregate showed higher toluene conversion and a longer lifetime without compromising the selectivity to xylene and p-xylene in toluene alkylation with methanol.

引用

页码：292 / 304

页数：13

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