Organosilane-assistant synthesis of hierarchical SAPO-34 aggregates with superior MTO performance

被引：24

作者：

Sun, Chao ^{[1
]}

Zhao, Aijuan ^{[1
]}

Wang, Yaquan ^{[1
]}

Wang, Ziyang ^{[1
]}

Zhao, Jingjing ^{[1
]}

Zhao, Taotao ^{[1
]}

Liu, Wenrong ^{[1
]}

Shi, Mingxue ^{[1
]}

Lu, Jiaxin ^{[1
]}

Wu, Shuhui ^{[1
]}

Bu, Lingzhen ^{[1
]}

机构：

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

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2021年 / 310卷

基金：

中国国家自然科学基金;

关键词：

Organosilane; Hierarchical SAPO-34 aggregates; Methanol to olefins; SOLVENT-FREE SYNTHESIS; GEL CONVERSION METHOD; MOLECULAR-SIEVES; METHANOL CONVERSION; DIRECTED SYNTHESIS; CATALYTIC-ACTIVITY; OLEFINS; ZEOLITES; TEMPLATE; DEACTIVATION;

D O I：

10.1016/j.micromeso.2020.110619

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Hierarchical SAPO-34 aggregates were hydrothermally synthesized with the assistance of organosilane N-[3-(Trimethoxysilyl)propyl]ethylenediamine (TPED), during which the morpholine was used as the template. The resultant products were characterized by XRD, SEM, ICP-OES, NH3-TPD, N-2 adsorption-desorption and TGA, and a possible formation mechanism was proposed. As the amount of added TPED varies, the morphologies, compositions and acid properties of the resultant hierarchical SAPO-34 aggregates differ. The hierarchical SAPO-34 aggregates possessed higher external surface areas, lower Si content, weaker strength and lower concentration in the strong acid sites than the conventional SAPO-34. The investigation of formation process showed that the addition of the TPED had a pivotal role for the formation of hierarchical SAPO-34 aggregates. Compared to conventional SAPO-34, the hierarchical SAPO-34 aggregates exhibited a significant improvement in methanol to olefin reaction (MTO) reactions due to their hierarchical structure and mild acid properties.

引用

页数：9

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