کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
74217 | 49084 | 2012 | 7 صفحه PDF | دانلود رایگان |

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 N2 due to its narrow pore window aperture at 273 K. Its significant uptake of N2 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 (∼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.
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► We synthesised four microporous SAPOs and tested them as CO2 sorbents.
► SAPO-56 showed very high CO2 uptake.
► SAPO-RHO showed high relative CO2-over-N2 uptake.
► We followed the molecular details of CO2 adsorption on SAPOs using in situ infrared spectroscopy.
► The SAPOs tested here are potentially good CO2 sorbents.
Journal: Microporous and Mesoporous Materials - Volume 156, 1 July 2012, Pages 90–96