Improvement of CO2 adsorption on ZIF-8 crystals modified by enhancing basicity of surface

被引：185

作者：

Zhang, Zhijuan ^{[1
]}

Xian, Shikai ^{[1
]}

Xi, Hongxia ^{[1
]}

Wang, Haihui ^{[1
]}

Li, Zhong ^{[1
]}

机构：

[1] S China Univ Technol, Sch Chem & Chem Engn, Guangzhou 510640, Peoples R China

来源：

CHEMICAL ENGINEERING SCIENCE | 2011年 / 66卷 / 20期

基金：

中国国家自然科学基金;

关键词：

Adsorption; Porous media; Fuel; Selectivity; Surface modification; Desorption activation energy; METAL-ORGANIC FRAMEWORKS; ZEOLITIC IMIDAZOLATE FRAMEWORKS; ACTIVATION-ENERGY; CARBON-DIOXIDE; AMBIENT-TEMPERATURE; MCM-41; SILICA; DRY GASES; PORE-SIZE; SEPARATION; DESORPTION;

D O I：

10.1016/j.ces.2011.06.051

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The imidazolate framework ZIF-8 samples modified separately by using ammonia impregnation and thermal treatment in atmosphere of N-2 and H-2 in order to improve its adsorption property toward CO2, and the modified samples A-ZIF-8, N-ZIF-8 were correspondingly available. The modified ZIF-8 samples were characterized, and the surface chmeical properties of the ZIF-8 samples were determined separately by FTIR, CO2-TPD, NH3-TPD and H2O-TPD. The isotherms of CO2 on the modified ZIF-8 samples were measured. Results showed that after surface modification, the total amounts of basicity of the modified samples significantly increased, and followed the order: A-ZIF-8 > N-ZIF-8 > O-ZIF-8. The uptakes of CO2 increased proportionally with the basic groups on the surfaces of the ZIF-8 samples due to CO2 being an acidic molecule. As a consequence of that, the CO2 adsorption capacity of the samples followed the order: A-ZIF-8 > H-ZIF-8 > O-ZIF-8. The amount adsorbed of CO2 on the modified ZIF-8 sample by ammonia impregnation is the highest, having an increase. (C) Elsevier Ltd. All rights reserved.

引用

页码：4878 / 4888

页数：11

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