Microwave-Assisted Reactive CO2 Capture with the SrCO3-Graphite System

Marin, Chris M.; Weidman, Jennifer; Nguyen, Manh Tien; Popczun, Eric J.; Shi, Fan; Gray, McMahan L.; Lekse, Jonathan W.; Alfonso, Dominic; Duan, Yuhua; Kauffman, Douglas R.

doi:10.1021/acs.energyfuels.4c05802

Microwave-Assisted Reactive CO₂ Capture with the SrCO₃-Graphite System

Journal Article · Fri Mar 07 00:00:00 EST 2025 · Energy and Fuels

DOI:https://doi.org/10.1021/acs.energyfuels.4c05802· OSTI ID:2555839

^[1]; Weidman, Jennifer ^[1]; Nguyen, Manh Tien ^[2]; ^[2]; ^[2]; Gray, McMahan L. ^[2]; Lekse, Jonathan W. ^[2]; ^[2]; ^[2]; ^[2]

National Energy Technology Laboratory (NETL), Pittsburgh, PA (United States); NETL Support Contractor, Pittsburgh, PA (United States)
National Energy Technology Laboratory (NETL), Pittsburgh, PA (United States)

This study details the initial development of a microwave heat-driven reactive CO₂ capture (RCC) process using the SrO/SrCO₃ cycle and graphitic carbon to absorb ppm-levels of CO₂ from humidified room temperature air and selectively convert it into CO. By combining first-principles density functional theory (DFT) simulations with thermogravimetric analysis (TGA) and X-ray diffraction (XRD) verification, it is demonstrated that SrO spontaneously absorbs moisture to generate Sr(OH)₂ followed by Sr(OH)₂*1H₂O, which then can spontaneously react with atmospheric levels of CO₂ to form SrCO₃. The resulting SrCO₃ can then react with solid carbon at elevated temperatures to selectively produce CO and regenerate SrO. Graphitic carbon is an excellent microwave absorber that can quickly generate temperatures approaching 1000 °C and then cool to room temperature within minutes, potentially allowing for integration with intermittent electricity. It is shown that using microwaves to selectively heat a mixture of graphitic carbon and SrCO₃ produced CO with 85 ± 3% selectivity and stable performance over ten cycles. The rapid heating for release and room temperature CO₂ uptake processes appeared to prevent performance loss from particle sintering typically observed with traditional thermal systems. In conclusion, these results demonstrate a new RCC approach that adds to the growing number of potential technologies available for converting CO₂ to useful chemicals.

View Accepted Manuscript (DOE)

Research Organization:: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy and Carbon Management (FECM), Office of Carbon Management

OSTI ID:: 2555839

Journal Information:: Energy and Fuels, Journal Name: Energy and Fuels Journal Issue: 11 Vol. 39; ISSN 0887-0624

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Atmospheric chemistry
carbon
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humidity
microwave-based reactive CO2 capture (RCC)
thermogravimetric analysis (TGA)
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Microwave-Assisted Reactive CO2 Capture with the SrCO3-Graphite System

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Microwave-Assisted Reactive CO₂ Capture with the SrCO₃-Graphite System