Journal of CO2 Utilization· 2026Q1
Proof-of-concept of a once-through configuration to optimize H2 conversion in CO2 methanation
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- Q1SCImago
- 2026year
Short summary
A novel once-through configuration using two reactors in series with intermediate water condensation under pressure achieves near complete H2 conversion (0.5% residual H2) in CO2 methanation, producing e-methane compliant for grid injection.
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Key points
- A once-through configuration with two reactors in series and intermediate water condensation was developed for CO2 methanation.
- The system achieves near complete H2 conversion, with residual H2 below 0.5% at 20 L(STP)/h/g space velocity and 10 barg.
- This configuration yields an e-CH4 productivity of 2.8 gCH4/h/gcat.
- The resulting e-methane stream meets stringent grid injection regulations.
AI-generated from the title and abstract; the full text is not read.
Abstract
Because of the high cost of green H2, its efficient conversion is of utmost importance for the deployment of any CO2 utilization process. In this work we show that it is possible to produce selectively e-methane from CO2 and H2 while approaching near complete H2 conversion. We achieve this result by leveraging a once-through configuration involving two reactors in series with intermediate water condensation working under pressure. This layout represents a flexible solution particularly useful to manage possible fluctuations in the availability of green H2. Notably, by working at the space velocity of 20 L(STP)/h/g and at the pressure of 10 barg it is possible to obtain an e-CH4 productivity of 2.8 gCH4/h/gcat, with only 0.5% of residual H2. This makes the obtained stream compliant for grid injection even in the countries with the most stringent regulations. By decreasing the GHSV, it is possible to push the H2 conversion even further, reaching residual H2 concentrations below 300 ppm. This, however, comes at the expense of a lower CH4 productivity.
The authors' abstract, as published at the source. Journal of CO2 Utilization, 2026 · DOI ↗
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Field: Catalysis
CatalysisChemical Engineering