Double-Layer Structured CO2 Adsorbent Functionalized with Modified Polyethyleneimine for High Physical and Chemical Stability
- Authors
- Jeon, Sunbin; Jung, Hyunchul; Kim, Sung Hyun; Lee, Ki Bong
- Issue Date
- 27-6월-2018
- Publisher
- AMER CHEMICAL SOC
- Keywords
- CO2 capture; polyethyleneimine; amine modification; double-layer structure; stability
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.10, no.25, pp.21213 - 21223
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 10
- Number
- 25
- Start Page
- 21213
- End Page
- 21223
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/74891
- DOI
- 10.1021/acsami.8b01749
- ISSN
- 1944-8244
- Abstract
- CO2 capture using polyethyleneimine (PEI)-impregnated silica adsorbents has been receiving a lot of attention. However, the absence of physical stability (evaporation and leaching of amine) and chemical stability (urea formation) of the PEI-impregnated silica adsorbent has been generally established. Therefore, in this study, a double-layer impregnated structure, developed using modified PEI, is newly proposed to enhance the physical and chemical stabilities of the adsorbent. Epoxy-modified PEI and diepoxide-crosslinked PEI were impregnated via a dry impregnation method in the first and second layers, respectively. The physical stability of the double-layer structured adsorbent was noticeably enhanced when compared to the conventional adsorbents with a single layer. In addition to the enhanced physical stability, the result of simulated temperature swing adsorption cycles revealed that the double-layer structured adsorbent presented a high potential working capacity (3.5 mmol/g) and less urea formation under CO2-rich regeneration conditions. The enhanced physical and chemical stabilities as well as the high CO2 working capacity of the double-layer structured adsorbent were mainly attributed to the second layer consisting of diepoxide-cross-linked PEI.
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