Synthetic natural gas production using CO2-rich waste stream from hydrothermal carbonization of biomass: Effect of impurities on the catalytic activity
The utilization of biomass and bio-waste, particularly through hydrothermal processes, has shown promise as a technology for converting these materials into valuable products. While most research has traditionally focused on the solid and liquid byproducts of these hydrothermal treatments, the gaseo...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-01-01
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| Series: | Journal of CO2 Utilization |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2212982023002640 |
| _version_ | 1797356039682654208 |
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| author | J. González-Arias G. Torres-Sempere J.J. Villora-Picó T.R. Reina J.A. Odriozola |
| author_facet | J. González-Arias G. Torres-Sempere J.J. Villora-Picó T.R. Reina J.A. Odriozola |
| author_sort | J. González-Arias |
| collection | DOAJ |
| description | The utilization of biomass and bio-waste, particularly through hydrothermal processes, has shown promise as a technology for converting these materials into valuable products. While most research has traditionally focused on the solid and liquid byproducts of these hydrothermal treatments, the gaseous phase has often been overlooked. This study specifically investigates the conversion of off-gases produced during hydrothermal carbonation (HTC) into synthetic natural gas, offering a readily marketable product with economic potential. Although the methanation of conventional flue gases has been extensively studied, dealing with non-standard off-gases from processes like HTC presents challenges due to the presence of minor impurities like CO and CH4. This novel research seeks to experimentally evaluate the methanation of HTC off-gases using nickel-based catalysts and analyze how these impurities affect the catalytic performance. The studied catalysts include nickel supported by ceria and alumina, as well as alumina supported nickel-cobalt systems. The results demonstrate that these catalysts exhibit high CO2 conversion and CH4 selectivity under ideal gas conditions. However, when real gas compositions with impurities are considered, CO2 conversion decreases at lower temperatures (ca. 20% lower conversion for real gas vs. ideal), probably due to side reactions such as CH4 cracking. This difference becomes less pronounced at higher temperatures. Nevertheless, the catalysts perform satisfactorily, especially at temperatures exceeding 350 °C. In conclusion, this study sheds light on the methanation of HTC off-gases and underscores the significance of understanding how impurities in real gases impact the process, providing potential directions for future research. |
| first_indexed | 2024-03-08T14:20:49Z |
| format | Article |
| id | doaj.art-191ba02f5ea94eec9ef5931c5c464262 |
| institution | Directory Open Access Journal |
| issn | 2212-9839 |
| language | English |
| last_indexed | 2024-03-08T14:20:49Z |
| publishDate | 2024-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of CO2 Utilization |
| spelling | doaj.art-191ba02f5ea94eec9ef5931c5c4642622024-01-14T05:38:29ZengElsevierJournal of CO2 Utilization2212-98392024-01-0179102653Synthetic natural gas production using CO2-rich waste stream from hydrothermal carbonization of biomass: Effect of impurities on the catalytic activityJ. González-Arias0G. Torres-Sempere1J.J. Villora-Picó2T.R. Reina3J.A. Odriozola4Inorganic Chemistry Department and Materials Sciences Institute, University of Seville-CSIC, Seville, Spain; Corresponding author.Inorganic Chemistry Department and Materials Sciences Institute, University of Seville-CSIC, Seville, SpainInorganic Chemistry Department and Materials Sciences Institute, University of Seville-CSIC, Seville, SpainInorganic Chemistry Department and Materials Sciences Institute, University of Seville-CSIC, Seville, Spain; School of Chemistry & Chemical Engineering, University of Surrey, Guildford GU2 7XH, UK; Corresponding author at: School of Chemistry & Chemical Engineering, University of Surrey, Guildford GU2 7XH, UK.Inorganic Chemistry Department and Materials Sciences Institute, University of Seville-CSIC, Seville, Spain; School of Chemistry & Chemical Engineering, University of Surrey, Guildford GU2 7XH, UKThe utilization of biomass and bio-waste, particularly through hydrothermal processes, has shown promise as a technology for converting these materials into valuable products. While most research has traditionally focused on the solid and liquid byproducts of these hydrothermal treatments, the gaseous phase has often been overlooked. This study specifically investigates the conversion of off-gases produced during hydrothermal carbonation (HTC) into synthetic natural gas, offering a readily marketable product with economic potential. Although the methanation of conventional flue gases has been extensively studied, dealing with non-standard off-gases from processes like HTC presents challenges due to the presence of minor impurities like CO and CH4. This novel research seeks to experimentally evaluate the methanation of HTC off-gases using nickel-based catalysts and analyze how these impurities affect the catalytic performance. The studied catalysts include nickel supported by ceria and alumina, as well as alumina supported nickel-cobalt systems. The results demonstrate that these catalysts exhibit high CO2 conversion and CH4 selectivity under ideal gas conditions. However, when real gas compositions with impurities are considered, CO2 conversion decreases at lower temperatures (ca. 20% lower conversion for real gas vs. ideal), probably due to side reactions such as CH4 cracking. This difference becomes less pronounced at higher temperatures. Nevertheless, the catalysts perform satisfactorily, especially at temperatures exceeding 350 °C. In conclusion, this study sheds light on the methanation of HTC off-gases and underscores the significance of understanding how impurities in real gases impact the process, providing potential directions for future research.http://www.sciencedirect.com/science/article/pii/S2212982023002640Hydrothermal carbonizationBiomassCO2 waste valorizationMethanationNi-based catalystCircular economy |
| spellingShingle | J. González-Arias G. Torres-Sempere J.J. Villora-Picó T.R. Reina J.A. Odriozola Synthetic natural gas production using CO2-rich waste stream from hydrothermal carbonization of biomass: Effect of impurities on the catalytic activity Journal of CO2 Utilization Hydrothermal carbonization Biomass CO2 waste valorization Methanation Ni-based catalyst Circular economy |
| title | Synthetic natural gas production using CO2-rich waste stream from hydrothermal carbonization of biomass: Effect of impurities on the catalytic activity |
| title_full | Synthetic natural gas production using CO2-rich waste stream from hydrothermal carbonization of biomass: Effect of impurities on the catalytic activity |
| title_fullStr | Synthetic natural gas production using CO2-rich waste stream from hydrothermal carbonization of biomass: Effect of impurities on the catalytic activity |
| title_full_unstemmed | Synthetic natural gas production using CO2-rich waste stream from hydrothermal carbonization of biomass: Effect of impurities on the catalytic activity |
| title_short | Synthetic natural gas production using CO2-rich waste stream from hydrothermal carbonization of biomass: Effect of impurities on the catalytic activity |
| title_sort | synthetic natural gas production using co2 rich waste stream from hydrothermal carbonization of biomass effect of impurities on the catalytic activity |
| topic | Hydrothermal carbonization Biomass CO2 waste valorization Methanation Ni-based catalyst Circular economy |
| url | http://www.sciencedirect.com/science/article/pii/S2212982023002640 |
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