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Energy-Efficient and Stable CO2 Adsorbent for CO2 Capture

Ma, Yao
http://rave.ohiolink.edu/etdc/view?acc_num=ucin168483872774883

Abstract Details

2023, MS, University of Cincinnati, Engineering and Applied Science: Chemical Engineering.
In this study, we focused on improving the stability and energy efficiency of silica-supported amine. Polyethylenimine (PEI)-impregnated mesocellular siliceous foam (MCF) was synthesized and characterized. Adsorption performances in TGA showed that PEI/MCF can capture CO2 gas in both post-combustion conditions and ambient air. However, PEI/MCF showed limited stability against thermal and oxidative degradations. To overcome these drawbacks, 1,2 epoxy butane (EB) modification was introduced, and the performances of the EB-modified PEI/MCF sorbents were studied. The capacity measurement performed using thermogravimetric analyzer (TGA) showed that EB modification will lower the CO2 adsorption capacity and optimum temperature under both 15% and 400 ppm CO2. Cyclic test with desorption in 100% CO2 at 120 °C showed that EB-PEI can be fully regenerated without significant degradation and possess higher working capacity than unmodified PEI after several adsorption-desorption cycles. When cyclic test was performed in 400 ppm CO2/air, oxygen slightly negatively impacted on the stability. To study the oxidative degradation on EB modified PEI, accelerated oxygen aging under 100% O2 gas at 100 °C was applied, and the DRIFT spectra of O2¬ degraded sorbents was recorded with time. A new peak at 1,670 cm-1 was observed in oxygen degraded sorbent, and with an increase in EB modification ratio, the intensity of the peak decreased. The CO2 adsorption performance of the sorbent also improved with an increase in EB modification ratio. Heat of desorption measurement also showed decreasing regeneration energy and temperature with an increase in EB ratio.
Joo-Youp Lee, Ph.D. (Committee Chair)
Jingjie Wu, Ph.D. (Committee Member)
Peter Panagiotis Smirniotis, Ph.D. (Committee Member)
32 p.
Chemical Engineering
CO2 adsorption; DAC; Oxidation-resistant

Recommended Citations

Citations

  • Ma, Y. (2023). Energy-Efficient and Stable CO2 Adsorbent for CO2 Capture [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin168483872774883

    APA Style (7th edition)

  • Ma, Yao. Energy-Efficient and Stable CO2 Adsorbent for CO2 Capture. 2023. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin168483872774883.

    MLA Style (8th edition)

  • Ma, Yao. "Energy-Efficient and Stable CO2 Adsorbent for CO2 Capture." Master's thesis, University of Cincinnati, 2023. http://rave.ohiolink.edu/etdc/view?acc_num=ucin168483872774883

    Chicago Manual of Style (17th edition)

ucin168483872774883
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This open access ETD is published by University of Cincinnati and OhioLINK.