Ethylenediamine-modified SBA-15 as Regenerable CO2 Sorbent
The CO2 adsorption properties of an ethylenediamine-modified mesoporous silica, EDA-SBA-15, have been examined. Adsorption isotherms were collected by TGA measurements, and the breakthrough time and adsorption capacity were measured using a fixed bed flow system. The EDA-SBA-15 sorbent adsorbs around 20 mg/g CO2 at ambient conditions from 15% CO2 in N2. At 1 atm CO2 partial pressure, its adsorption capacity is 86 mg/g at 22 C. The EDA-SBA-15 sorbent is fully regenerable by thermal swings during cyclic adsorption/desorption. Desorption of CO2 occurs at 110 C on EDA-SBA-15 and the sorbent is stable in air up to 200 C. The CO2 uptake by EDA-SBA-15 is not influenced by humidity. The adsorption capacity data are compared with those of previously reported amine-modified silica sorbents.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 15016789
- Report Number(s):
- PNNL-SA-41861; IECRED; TRN: US200608%%419
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 44, Issue 9; ISSN 0888-5885
- Country of Publication:
- United States
- Language:
- English
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