Insights into the performance of the two contrasting dynamic adsorption platforms in the removal of gaseous benzene on microporous carbon materials
- Authors
- Wang, Xinzhi; Anand, Bhaskar; Kim, Ki-Hyun; Younis, Sherif A
- Issue Date
- Sep-2022
- Publisher
- Elsevier Ltd
- Keywords
- Activated carbon; Breakthrough kinetic analysis; Denuder adsorber; Gaseous benzene; Packed-bed
- Citation
- Journal of Cleaner Production, v.364, pp.1 - 11
- Indexed
- SCIE
SCOPUS
- Journal Title
- Journal of Cleaner Production
- Volume
- 364
- Start Page
- 1
- End Page
- 11
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/191170
- DOI
- 10.1016/j.jclepro.2022.132520
- ISSN
- 0959-6526
- Abstract
- A high-speed purification system made of packed-bed adsorber is often subject to apparent demerits (e.g., pressure drop and/or high energy consumption) when treating waste gas. As a potential alternative to such system, a denuder sorbent tube has been constructed by coating powder-activated carbon (PAC) on the inner surface of the sorbent tube with the help of polyvinyl alcohol (PVA) as adhesive. The designed denuder sorbent tube was then used to treat a gaseous stream containing 1 Pa benzene (as a model volatile organic compound (VOC)) under various volumetric flow rates (100–500 mL·min−1). The results revealed that the designed packed bed outperformed the denuder system by a factor of at least two (in terms of the breakthrough volume (BTV, L·g−1) and adsorption capacity (Q, mg·g−1) at 10% BT) when tested at upper flow rates (200–500 mL·min−1). In contrast, the pattern was reversed at the lowest flow rate of 100 mL·min−1 so that the denuder (BTV 10% = 615 L·g−1) outperforms the packed bed (330 L·g−1). According to the adsorption kinetic analysis, the surface-interaction and film diffusion have a rate-determining adsorption step in the denuder, while the boundary/pore diffusion mechanism should play a crucial role in the packed-bed system. Overall, the PAC-based denuder system is recommendable in removing VOCs at or near ambient conditions as an efficient alternative to replace traditional packed-bed columns.
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