CO2 adsorption on agricultural biomass combustion ashes

Abstract

Carbon capture and storage has become an alternative means of confronting global 16 warming. Further research and development into adequate and low-cost materials is 17 required for CO2 adsorption technologies. 1819Samples of fly ash, bottom ash and their respective pellets, produced from wheat bran 20 combustion, were characterized and tested to assess their capacity for CO2 adsorption at 21 different temperatures. Neither the ashes nor their pellets were subject to prior 22 thermochemical activation. 2324The bottom ash sample and its pellets showed a higher adsorption capacity for the majority 25 of the temperatures studied. The pelletized bottom ash reached the maximum adsorption 26 capacity (0.07 mmol CO2/g), followed by the non-pelletized bottom ash (0.06 mmol 27 CO2/g); both at an adsorption temperature of 25°C. 2829CO2 adsorption of bottom ash, from the combustion of wheat bran (agricultural biomass), 30 by a physical adsorption mechanism was demonstrated whereas with the fly ash sample, 31 CO2 adsorption by both physical and chemical adsorption mechanisms was identified.