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Role of Amine Structure on Carbon Dioxide Adsorption from Ultradilute Gas Streams such as Ambient Air

Author(s): Didas SA, Kulkarni AR, Sholl DS, Jones CW

Published: July, 2012

Publisher: ChemSusChem

DOI: 10.1002/cssc.201200196

Tags: Air Capture

URL: http://onlinelibrary.wiley.com/doi/10.1002/cssc.201200196/abstract

Abstract: A fundamental study on the adsorption properties of primary, secondary, and tertiary amine materials is used to evaluate what amine type(s) are best suited for ultradilute CO2 capture applications. A series of comparable materials comprised of primary, secondary, or tertiary amines ligated to a mesoporous silica support via a propyl linker are used to systematically assess the role of amine type. Both CO2 and water adsorption isotherms are presented for these materials in the range relevant to CO2 capture from ambient air and it is demonstrated that primary amines are the best candidates for CO2 capture from air. Primary amines possess both the highest amine efficiency for CO2 adsorption as well as enhanced water affinity compared to other amine types or the bare silica support. The results suggest that the rational design of amine adsorbents for the extraction of CO2 from ambient air should focus on adsorbents rich in primary amines.


CO2 Capture from Dilute Gases as a Component of Modern Global Carbon Management

Author(s): Jones CW

Published: June, 2010

Publisher: Annual Review of Chemical and Biomolecular Engineering

DOI: 10.1146/annurev-chembioeng-061010-114252

Tags: Air Capture, Research

URL: http://www.annualreviews.org/doi/abs/10.1146/annurev-chembioeng-061010-114252

Abstract: The growing atmospheric CO2 concentration and its impact on climate have motivated widespread research and development aimed at slowing or stemming anthropogenic carbon emissions. Technologies for carbon capture and sequestration (CCS) employing mass separating agents that extract and purify CO2 from flue gas emanating from large point sources such as fossil fuel–fired electricity-generating power plants are under development. Recent advances in solvents, adsorbents, and membranes for postcombustion CO2 capture are described here. Specifically, room-temperature ionic liquids, supported amine materials, mixed matrix and facilitated transport membranes, and metal-organic framework materials are highlighted. In addition, the concept of extracting CO2 directly from ambient air (air capture) as a means of reducing the global atmospheric CO2 concentration is reviewed. For both conventional CCS from large point sources and air capture, critical research needs are identified and discussed.


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