Abstract
Microporous activated carbon fibers (ACFs) were developed for CO2 capture based on potassium hydroxide (KOH) activation and tetraethylenepentamine (TEPA) amination. The material properties of the modified ACFs were characterized using several techniques. The adsorption breakthrough curves of CO2 were measured and the effect of relative humidity in the carrier gas was determined. The KOH activation at high temperature generated additional pore networks and the intercalation of metallic K into the carbon matrix, leading to the production of mesopore and micropore volumes and providing access to the active sites in the micropores. However, this treatment also resulted in the loss of nitrogen functionalities. The TEPA amination has successfully introduced nitrogen functionalities onto the fiber surface, but its long-chain structure blocked parts of the micropores and, thus, made the available surface area and pore volume limited. Introduction of the power of time into the Wheeler equation was required to fit the data well. The relative humidity within the studied range had almost no effects on the breakthrough curves. It was expected that the concentration of CO2 was high enough so that the impact on CO2 adsorption capacity lessened due to increased relative humidity.
Highlights
IntroductionThe CO2 capture and sequestration (CCS) is a set of technologies that can greatly reduce CO2 emissions and is considered an effective approach in mitigating global warming [1,2,3,4]
As interests over the impact of the emissions of greenhouse gases on global warming continue to increase, especially the rising concentration of carbon dioxide (CO2 ) primarily from the use of fossil fuels, it is imperative to alleviate CO2 emissions by development of pollution prevention technologies.The CO2 capture and sequestration (CCS) is a set of technologies that can greatly reduce CO2 emissions and is considered an effective approach in mitigating global warming [1,2,3,4]
One commercial polyacrylonitrile (PAN)-based activated carbon fibers (ACFs) cloth sample was used as the starting material (AW1107, denoted as activated carbon fiber cloth (ACFC)), which was provided by Taiwan Carbon Technology Co
Summary
The CO2 capture and sequestration (CCS) is a set of technologies that can greatly reduce CO2 emissions and is considered an effective approach in mitigating global warming [1,2,3,4]. CO2 capture technologies, such as absorption, adsorption, cryogenics, and membranes have been widely investigated [4,6]. The absorption–regeneration technologies are recognized as the most effective methods and are widely implemented, the high energy density of the absorption processes has restricted their applications. Adsorption has been considered as one of the most cost-effective options for CO2 separation because of the low energy requirement, cost advantage, and ease of applicability over a relatively wide range of temperatures and pressures [7]
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