期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 186, 期 -, 页码 84-93出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2013.11.032
关键词
Polyethyleneimine (PEI); Mesostructured cellular foam (MCF); CO2 adsorption
类别
资金
- Australian Government through AusAID and its CRC Program
A set of branched and linear polyethyleneimine (PEI) modified mesocellular siliceous foams (MCF) were evaluated as adsorbents for CO2 capture at modestly elevated temperatures under conditions that simulate the vacuum swing adsorption (VSA) process in humidified gas. Increasing the temperature was found to be beneficial for achieving reversible CO2 adsorption/desorption with reasonable capacities and rates. Under humid conditions, the materials lost 0-15% of their adsorption capacities in 0.5 atm CO2 compared to under dry conditions at 105-115 degrees C. The working capacity (0.025-0.15 atm CO2) at 105 degrees C was 2-17% higher under humid than under dry conditions. During cycling, the branched PEI adsorbent showed a gradual decrease in CO2 adsorption-desorption capacity under dry conditions, but the reduction in capacity was significantly reduced under wet conditions. The reduction in CO2 adsorption capacity was attributed to by-product formation, confirmed by IR, C-13 CP-MAS NMR and EDS. In a humid environment, the formation of by-product was significantly reduced. (C) 2013 Elsevier Inc. All rights reserved.
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