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. 2023 Feb 2;16(3):1266.
doi: 10.3390/ma16031266.

High-Pressure Adsorption of CO2 and CH4 on Biochar-A Cost-Effective Sorbent for In Situ Applications

Marcin Lutyński  1 , Jan Kielar  2 , Dawid Gajda  3 , Marcel Mikeska  2 , Jan Najser  2
Affiliations

High-Pressure Adsorption of CO2 and CH4 on Biochar-A Cost-Effective Sorbent for In Situ Applications

Marcin Lutyński et al. Materials (Basel). .

Abstract

The search for an effective, cost-efficient, and selective sorbent for CO2 capture technologies has been a focus of research in recent years. Many technologies allow efficient separation of CO2 from industrial gases; however, most of them (particularly amine absorption) are very energy-intensive processes not only from the point of view of operation but also solvent production. The aim of this study was to determine CO2 and CH4 sorption capacity of pyrolyzed spruce wood under a wide range of pressures for application as an effective adsorbent for gas separation technology such as Pressure Swing Adsorption (PSA) or Temperature Swing Adsorption (TSA). The idea behind this study was to reduce the carbon footprint related to the transport and manufacturing of sorbent for the separation unit by replacing it with a material that is the direct product of pyrolysis. The results show that pyrolyzed spruce wood has a considerable sorption capacity and selectivity towards CO2 and CH4. Excess sorption capacity reached 1.4 mmol·g-1 for methane and 2.4 mmol·g-1 for carbon dioxide. The calculated absolute sorption capacity was 1.75 mmol·g-1 at 12.6 MPa for methane and 2.7 mmol·g-1 at 4.7 MPa for carbon dioxide. The isotherms follow I type isotherm which is typical for microporous adsorbents.

Keywords: biochar; carbon capture; carbon dioxide; methane; physical adsorption.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Adsorption test sample of spruce wood: before (a) and after (b) pyrolysis.
Figure 2
Figure 2
Scheme of laboratory pyrolysis unit.
Figure 3
Figure 3
Temperature curve of the pyrolysis process (orange—temperature in furnace; blue—temperature in reactor).
Figure 4
Figure 4
Scheme of laboratory sorption setup used in the study (SC—sample cell; RC—reference cell).
Figure 5
Figure 5
Sorption test procedure.
Figure 6
Figure 6
Carbon dioxide and methane sorption isotherms of pyrolyzed spruce wood measured at 40 °C (a) and plot of carbon dioxide excess sorption isotherms plotted against CO2 free phase density with fitted Langmuir model (dashed line) (b).
Figure 7
Figure 7
Absolute sorption isotherms of methane on pyrolyzed spruce wood at 40 °C with the Langmuir model fitted (dashed line).
Figure 8
Figure 8
Absolute sorption isotherms of carbon dioxide on pyrolyzed spruce wood at 40 °C with the Langmuir model fitted (dashed line).
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