期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 156, 期 -, 页码 90-96出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2012.02.003
关键词
Carbon capture; Silicoaluminophosphates; Adsorption; Carbon dioxide; SAPO-56
类别
资金
- Swedish Research Council (VR)
- Swedish Governmental Agency for Innovation Systems (VINNOVA) through the Berzelii center EXSELENT
- Swedish Energy Agency
Silicoaluminophosphates (SAPO-17, SAPO-35, SAPO-56 and SAPO-RHO) synthesised via hydrothermal means are tested for their abilities to adsorb carbon dioxide. These 8-ring microporous phosphates show high capacities to adsorb CO2. SAPO-RHO has a high uptake of CO2 and a very low uptake of N-2 due to its narrow pore window aperture at 273 K. Its significant uptake of N-2 at 77 K is rationalised by a temperature induced shrinkage effect. SAPO-56 has a slightly higher CO2 capacity (5.42 mmol/g, 273 K, 101 kPa) and is less water sensitive than zeolite 13X. Cyclic adsorption and in situ infrared spectroscopy (IR) reveal that SAPOs retain 95% of their original CO2 capacity after six cycles and that adsorption occurs via physisorption. The calculated heat of adsorption for CO2 (at 0.2-0.7 mmol/g loading) on SAPO-56 and SAPO-RHO lies in the physisorption range (similar to 35 kJ/mol). SAPOs, in particular SAPO-56 and SAPO-RHO, possess many desirable properties and are potentially good adsorbents for CO2 capture in swing adsorption processes. (C) 2012 Elsevier Inc. All rights reserved.
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