K2CO3-Containing Composite Sorbents Based on Thermally Modified Alumina: Synthesis, Properties, and Potential Application in a Direct Air Capture/Methanation Process Full article
| Journal |
Industrial and Engineering Chemistry Research
ISSN: 0888-5885 , E-ISSN: 1520-5045 |
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| Output data | Year: 2020, Volume: 59, Number: 15, Pages: 7130-7139 Pages count : 10 DOI: 10.1021/acs.iecr.9b05457 | ||||
| Tags | Sorption; Potassium; Atmospheric chemistry; Composites; Sorbents | ||||
| Authors |
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| Affiliations |
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Funding (2)
| 1 | Federal Agency for Scientific Organizations | 0303-2016-0010 |
| 2 | Russian Foundation for Basic Research | 17-73-10068 |
Abstract:
In this work, a series of K2CO3-containing composite materials based on alumina supports with different porous structure were synthesized and studied in a direct air capture process. Alumina supports with the modified porous structure were obtained as a result of the thermal treatment of porous γ-Al2O3 at elevated temperatures. Composite materials were synthesized by impregnating the porous support (unmodified or modified alumina) with an aqueous solution of potassium carbonate. All the K2CO3/Al2O3 sorbents were tested in the process of CO2 absorption from the air with a relative humidity of 25% followed by thermal desorption as a result of heating the material to 200 °C. The composite materials were characterized by X-ray diffraction and temperature-programmed desorption methods. Among the materials studied, the composite sorbent based on the porous alumina thermally modified at T = 750 °C demonstrated the highest dynamic CO2 absorption capacity. This composite material was later tested in a direct air capture/methanation process combining CO2 capture from ambient air and methanation via the catalytic Sabatier reaction. The process was implicated using an adsorber and a catalytic reactor connected in series. To regenerate the composite sorbent after the step of CO2 absorption from ambient air, the adsorber was heated to 200 °C in an H2 flow. The desorbed CO2 was converted into methane in the preheated catalytic reactor containing the Ru/Al2O3 methanation catalyst. The optimization of the operating conditions (namely, the catalytic reactor temperature and the inlet H2 flow rate) allowed for obtaining CH4 from carbon dioxide with a yield of 98%. The thermal energy required for heating the new CO2 sorbent from 25 to 200 °C at the desorption/methanation step of the direct air capture/methanation process was estimated to be 9 MJ per 1 m3 (STP) of produced CH4.
Cite:
Veselovskaya J.V.
, Lysikov A.I.
, Netskina O.V.
, Kuleshov D.V.
, Okunev A.G.
K2CO3-Containing Composite Sorbents Based on Thermally Modified Alumina: Synthesis, Properties, and Potential Application in a Direct Air Capture/Methanation Process
Industrial and Engineering Chemistry Research. 2020. V.59. N15. P.7130-7139. DOI: 10.1021/acs.iecr.9b05457 WOS Scopus РИНЦ AN OpenAlex
K2CO3-Containing Composite Sorbents Based on Thermally Modified Alumina: Synthesis, Properties, and Potential Application in a Direct Air Capture/Methanation Process
Industrial and Engineering Chemistry Research. 2020. V.59. N15. P.7130-7139. DOI: 10.1021/acs.iecr.9b05457 WOS Scopus РИНЦ AN OpenAlex
Dates:
| Submitted: | Dec 1, 2019 |
| Accepted: | Jan 31, 2020 |
| Published online: | Jan 31, 2020 |
| Published print: | Apr 15, 2020 |
Identifiers:
| Web of science: | WOS:000526339100033 |
| Scopus: | 2-s2.0-85084641561 |
| Elibrary: | 43286420 |
| Chemical Abstracts: | 2020:212469 |
| OpenAlex: | W3003332204 |