Abstract
Biomass is a widely distributed and renewable source of carbon. The main objective of this work is to produce an activated carbon from coconut shells with suitable characteristics to separate CO2 from biogas. The textural characterization of the adsorbent has been determined. Pure component adsorption isotherms of CO2 and CH4 at 30, 50 and 70 °C have been measured. The results reveal that the activated carbon had high CO2 adsorption capacity. Equilibrium of adsorption of CO2 and CH4 adsorption on the produced activated carbon reached 8.36 mmol/g and 4.63 mmol/g, respectively, at 30 °C and 10 bars. Moreover, the performance of the produced activated carbon, as a potential adsorbent for CO2 capture from a CO2/CH4 gas mixture, has been evaluated under dynamic conditions in a dedicated fixed-bed setup. The CO2 and CH4 adsorption capacities of the produced activated carbon are estimated to be 1.86 and 0.52 mol/kg, respectively, at 30 °C and 1 bar.
Highlights
Biogas is a biofuel that is naturally produced by the decomposition of various types of organic matter
Proximate analysis shows that carbons. The (CNS) are characterized by low ash content (0.42 wt.%), which is a desirable feature for activated carbon production
The results of this study showed that the activated carbon presented good development and high BET
Summary
Biogas is a biofuel that is naturally produced by the decomposition of various types of organic matter. Upgrading of biogas has gained important attention due to the steady growth in global energy demand, coupled with the depletion of fossil fuel resources, their unaffordable prices, and the environmental damage they cause [1,2,3]. Methane and carbon dioxide are the main components of biogas. The energy value of biogas is much lower than natural gas due to the presence of carbon dioxide. To increase its heating value, the carbon dioxide content must be reduced. The CO2 removal is the most important step in biogas upgrading
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