Journal
ENERGY & FUELS
Volume 25, Issue 11, Pages 5528-5537Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ef201224v
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Funding
- Global Thermostat, LLC
- School of Chemical & Biomolecular Engineering at Georgia Tech
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Carbon management by a means of CO2 capture from large stationary sources such as coal-fired power plants or from ambient air is a significant global issue. In the context of steam-striping as a regeneration process for solid CO2 adsorbents, new adsorbent materials robust enough for direct contact with low temperature steam are needed. Here, mesoporous gamma-alumina-supported poly(ethyleneimine) composite materials are prepared and evaluated as effective CO2 adsorbents, using dilute CO2 streams such as simulated flue gas (10% CO2) and ultradilute streams such as simulated ambient air (400 ppm CO2). In comparison to the silica-supported amine adsorbents typically utilized for CO2 capture applications, the alumina-supported amine adsorbents give better performance in terms of both capture capacity and amine efficiency, in particular, at ambient air conditions. In addition, the alumina-supported amines are stable over short multicycle temperature swing tests and, more importantly, appear to be more robust than the silica-based counterparts upon direct contact with steam. Thus, the resulting alumina-supported amines are suggested to be promising new materials for CO2 capture processes equipped with steam-stripping regeneration, especially from ultradilute gas streams.
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