Journal
ENERGY
Volume 216, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2020.119230
Keywords
CO2 separation; Natural gas purification; Adsorption; Sustainable energy; Clean energy; Thermodynamics; And high-pressure adsorption
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Funding
- Yayasan-UTP research grant [YUTP-0153AA-H01]
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Functionalized covalent triazine based frameworks (CTF-NH) showed enhanced CO2 and CH4 adsorption capacities with amine functionalities, but decreasing capacities with rising temperatures. The selectivity of CO2/CH4 increased, and the adsorption is found to be predominantly physisorption at less than 20 kJ/mol.
In this work, high pressure selective CO2/CH4 adsorption over functionalized covalent triazine based frameworks (CTF-NH) have been reported at high-pressure (1-20 bar) and different temperatures. The findings revealed that the successive incorporation of amine functionalities to the CTF leads to the enhancement of CO2 and CH4 adsorption capacities by 94.99% and 3.69%, respectively. The CO2 and CH4 adsorption capacities decreased with rising temperatures. The selectivity of CO2/CH4 was improved from 2.745 to 5.145. The different adsorption isotherms showed good fitting agreement with the experimentally acquired data with a lower value (AARE and R-2) approaching to 1. The isotherm analysis exhibited that the adsorption is heterogeneous and satisfactory under these conditions. Dubinin-Radushkevich (D-R) isotherm analysis showed that the physisorption is dominant, with adsorption energy of less than 20 kJ/mol. Finally, thermodynamic properties revealed that at lower temperatures, the adsorption phenomenon is satisfactory, physical in nature, and exhibiting less disorder and randomness. (C) 2020 Elsevier Ltd. All rights reserved.
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