Effect of the porous structure in carbon materials for CO2 capture at atmospheric and high-pressure

被引:192
作者
Casco, Mirian E. [1 ]
Martinez-Escandell, Manuel [1 ]
Silvestre-Albero, Joaquin [1 ]
Rodriguez-Reinoso, Francisco [1 ]
机构
[1] Univ Alicante, Inst Univ Mat, Dept Quim Inorgan, Lab Mat Avanzados, E-03080 Alicante, Spain
关键词
HIGH-SURFACE-AREA; MOLECULAR-SIEVES; DIOXIDE CAPTURE; ADSORPTION;
D O I
10.1016/j.carbon.2013.09.086
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Activated carbons prepared from petroleum pitch and using KOH as activating agent exhibit an excellent behavior in CO2 capture both at atmospheric (similar to 168 mg CO2/g at 298 K) and high pressure (similar to 1500 mg CO2/g at 298 K and 4.5 MPa). However, an exhaustive evaluation of the adsorption process shows that the optimum carbon structure, in terms of adsorption capacity, depends on the final application. Whereas narrow micropores (pores below 0.6 nm) govern the sorption behavior at 0.1 MPa, large micropores/small mesopores (pores below 2.0-3.0 nm) govern the sorption behavior at high pressure (4.5 MPa). Consequently, an optimum sorbent exhibiting a high working capacity for high pressure applications, e.g., pressure-swing adsorption units, will require a poorly-developed narrow microporous structure together with a highly-developed wide microporous and small mesoporous network. The appropriate design of the preparation conditions gives rise to carbon materials with an extremely high delivery capacity similar to 1388 mg CO2/g between 4.5 MPa and 0.1 MPa. Consequently, this study provides guidelines for the design of carbon materials with an improved ability to remove carbon dioxide from the environment at atmospheric and high pressure. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:230 / 235
页数:6
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