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.
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收藏
页数：9
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