Journal
CHEMICAL ENGINEERING SCIENCE
Volume 66, Issue 20, Pages 4878-4888Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2011.06.051
Keywords
Adsorption; Porous media; Fuel; Selectivity; Surface modification; Desorption activation energy
Categories
Funding
- National Natural Science Foundation of China [20936001]
- Science & Technology Foundation of Guangdong Province
- State Key Lab of Subtropical Building Science, South China University of Technology [C710090Z]
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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.
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