Performance Assessment of Novel Soda Ash Adsorbent Biogas Sweetening: Fixed Bed Studies, Adsorption Kinetics, and Adsorption Isotherms
The reliance on greenhouse gas-emitting unrenewable energy sources such as coal, natural gas, and oil, increases climate change. Transitioning to renewable energy, such as biogas, is crucial to reducing environmental degradation and global warming. The existence of impurities such as hydrogen sulfid...
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MDPI AG
2025-03-01
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| author | Register Mrosso Cleophas Achisa Mecha |
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| description | The reliance on greenhouse gas-emitting unrenewable energy sources such as coal, natural gas, and oil, increases climate change. Transitioning to renewable energy, such as biogas, is crucial to reducing environmental degradation and global warming. The existence of impurities such as hydrogen sulfide hampers the application of biogas. Utilizing natural resources for biogas purification is essential to improve access to clean energy for low-income communities. This study used soda ash derived from Lake Natron in Tanzania as a sorbent for H<sub>2</sub>S removal. Effects of sorbent mass, flow rate, and particle size were investigated. Experimental data were analyzed using kinetic models, adsorption isotherms, and breakthrough curves. Soda ash of 280 μm particle size, a flow rate of 0.03 m<sup>3</sup>/h, and a mass of 75 g demonstrated the best performance, achieving an efficiency of 94% in removal and a sorption capacity of 0.02 g per 100 g in five repeated cycles. Freundlich and Jovanovich’s isotherms match the data with n = 0.4 and K<sub>j</sub> = 0.003, respectively. Adsorption kinetics were best described by the intra-particle model (k<sub>id</sub> = 0.14, c = 0.59 mg/g, and R<sup>2</sup> = 0.972). A breakthrough analysis indicated that the Yoon–Nelson model provided the best fit with an R<sup>2</sup> of 0.95. Soda ash from Lake Natron demonstrated great potential in biogas desulphurization, thus contributing to the production and access to clean energy. |
| format | Article |
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| institution | DOAJ |
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| publishDate | 2025-03-01 |
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| spelling | doaj-art-2f70ffcc181440f4950a55291dead1d52025-08-20T03:14:17ZengMDPI AGChemEngineering2305-70842025-03-01923310.3390/chemengineering9020033Performance Assessment of Novel Soda Ash Adsorbent Biogas Sweetening: Fixed Bed Studies, Adsorption Kinetics, and Adsorption IsothermsRegister Mrosso0Cleophas Achisa Mecha1Clean Energy Technologies Research Group, School of Materials, Energy, Water and Environmental Sciences (MEWES), Nelson Mandela African Institution of Science and Technology (NM-AIST), Arusha P.O. Box 447, TanzaniaRenewable Energy, Environment, Nanomaterials, and Water Research Group, Moi University, Eldoret P.O. Box 3900, KenyaThe reliance on greenhouse gas-emitting unrenewable energy sources such as coal, natural gas, and oil, increases climate change. Transitioning to renewable energy, such as biogas, is crucial to reducing environmental degradation and global warming. The existence of impurities such as hydrogen sulfide hampers the application of biogas. Utilizing natural resources for biogas purification is essential to improve access to clean energy for low-income communities. This study used soda ash derived from Lake Natron in Tanzania as a sorbent for H<sub>2</sub>S removal. Effects of sorbent mass, flow rate, and particle size were investigated. Experimental data were analyzed using kinetic models, adsorption isotherms, and breakthrough curves. Soda ash of 280 μm particle size, a flow rate of 0.03 m<sup>3</sup>/h, and a mass of 75 g demonstrated the best performance, achieving an efficiency of 94% in removal and a sorption capacity of 0.02 g per 100 g in five repeated cycles. Freundlich and Jovanovich’s isotherms match the data with n = 0.4 and K<sub>j</sub> = 0.003, respectively. Adsorption kinetics were best described by the intra-particle model (k<sub>id</sub> = 0.14, c = 0.59 mg/g, and R<sup>2</sup> = 0.972). A breakthrough analysis indicated that the Yoon–Nelson model provided the best fit with an R<sup>2</sup> of 0.95. Soda ash from Lake Natron demonstrated great potential in biogas desulphurization, thus contributing to the production and access to clean energy.https://www.mdpi.com/2305-7084/9/2/33biogashydrogen sulfidefixed bed adsorption modelsadsorption isothermsadsorption kinetics |
| spellingShingle | Register Mrosso Cleophas Achisa Mecha Performance Assessment of Novel Soda Ash Adsorbent Biogas Sweetening: Fixed Bed Studies, Adsorption Kinetics, and Adsorption Isotherms ChemEngineering biogas hydrogen sulfide fixed bed adsorption models adsorption isotherms adsorption kinetics |
| title | Performance Assessment of Novel Soda Ash Adsorbent Biogas Sweetening: Fixed Bed Studies, Adsorption Kinetics, and Adsorption Isotherms |
| title_full | Performance Assessment of Novel Soda Ash Adsorbent Biogas Sweetening: Fixed Bed Studies, Adsorption Kinetics, and Adsorption Isotherms |
| title_fullStr | Performance Assessment of Novel Soda Ash Adsorbent Biogas Sweetening: Fixed Bed Studies, Adsorption Kinetics, and Adsorption Isotherms |
| title_full_unstemmed | Performance Assessment of Novel Soda Ash Adsorbent Biogas Sweetening: Fixed Bed Studies, Adsorption Kinetics, and Adsorption Isotherms |
| title_short | Performance Assessment of Novel Soda Ash Adsorbent Biogas Sweetening: Fixed Bed Studies, Adsorption Kinetics, and Adsorption Isotherms |
| title_sort | performance assessment of novel soda ash adsorbent biogas sweetening fixed bed studies adsorption kinetics and adsorption isotherms |
| topic | biogas hydrogen sulfide fixed bed adsorption models adsorption isotherms adsorption kinetics |
| url | https://www.mdpi.com/2305-7084/9/2/33 |
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