Mesoporous Carbon-Supported Solid Amine Sorbents for Low-Temperature Carbon Dioxide Capture

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• 作者：Jitong Wang ; Mei Wang ; Beibei Zhao ; Wenming Qiao ; Donghui Long ; Licheng Ling
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：April 17, 2013
• 年：2013
• 卷：52
• 期：15
• 页码：5437-5444
• 全文大小：527K
• 年卷期：v.52,no.15(April 17, 2013)
• ISSN：1520-5045

文摘

A novel solid amine sorbent has been developed based on polyethylenimine (PEI)-impregnated mesoporous carbon (MC) supports for regenerative removal of pure CO₂ at low temperature. The adequate pore volume, proper pore size, and interconnected 3D framework of as-prepared MC allow the easy dispersion and immobilization of PEI within their channels. The structure generates considerable gas/amine interfacial area and provides access to fast CO₂ diffusion for reactivity with the amine groups. In addition, the kinetic inhibition of CO₂ diffusion within the PEI films could be alleviated by the introduction of polymer-based surfactant, offering an increased number of reactive sites and higher utilization efficiency of amine groups. Owing to the advanced support and facilitating kinetic diffusion, as-prepared MC-based solid amines display outstanding sorption features for CO₂ capture at low-temperature range. The highest sorption capacities of 4.67 mmol路g^鈥? at 30 掳C and 2.80 mmol路g^鈥? at 0 掳C for pure CO₂ are attained. They also show fast kinetics, a good selectivity for CO₂/N₂ separation, and very reversible and durable CO₂ capturing performance at low temperature. All the results suggest that MC-based solid amine sorbent is a promising CO₂ sorbent to meet the challenges of the current CO₂ capture and storage technology.