Double-Layer Structured CO2 Adsorbent Functionalized with Modified Polyethyleneimine for High Physical and Chemical
Sunbin Jeon1, Hyunchul Jung2, Sung Hyun Kim1
1Department of Chemical and Biological Engineering , Korea University , 145 Anam-ro , Seongbuk-gu, Seoul 02841 , Republic of Korea.
ACS Applied Materials & Interfaces
|June 19, 2018
Summary
A novel double-layer adsorbent using modified polyethyleneimine (PEI) significantly improves physical and chemical stability for CO2 capture. This enhanced stability leads to higher working capacity and reduced urea formation during regeneration.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- Polyethyleneimine (PEI)-impregnated silica is widely studied for CO2 capture.
- Conventional PEI-silica adsorbents suffer from poor physical stability (amine evaporation/leaching) and chemical stability (urea formation).
Purpose of the Study:
- To develop a double-layer impregnated structure using modified PEI to enhance the stability of CO2 adsorbents.
- To evaluate the physical and chemical stability, CO2 working capacity, and urea formation of the novel adsorbent.
Main Methods:
- A double-layer structure was created using epoxy-modified PEI (first layer) and diepoxide-cross-linked PEI (second layer) via dry impregnation.
- Simulated temperature swing adsorption cycles were conducted to assess performance under regeneration conditions.
Main Results:
- The double-layer structured adsorbent exhibited significantly enhanced physical stability compared to single-layer adsorbents.
- A high potential working capacity of 3.5 mmol/g was achieved.
- Reduced urea formation was observed under CO2-rich regeneration conditions.
Conclusions:
- The proposed double-layer structure effectively improves the physical and chemical stability of PEI-impregnated silica adsorbents.
- The diepoxide-cross-linked PEI in the second layer is crucial for enhanced stability and performance.
- This novel adsorbent shows high potential for efficient and stable CO2 capture applications.
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