CO2 adsorption on agricultural biomass combustion ashes

Sebastián Lira-Zúñiga,Ronaldo Herrera-Urbina,Leandro Herrera-Zeppelin,César Sáez-Navarrete,Leonardo Rodríguez-Córdova

doi:10.4067/s0718-221x2016005000053

Sebastián Lira-Zúñiga, Ronaldo Herrera-Urbina + Show 3 more

Open Access

https://doi.org/10.4067/s0718-221x2016005000053

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Abstract

Carbon capture and storage has become an alternative means of confronting global warming. Further research and development into adequate and low-cost materials is required for CO2 adsorption technologies.Samples of fly ash, bottom ash and their respective pellets, produced from wheat bran combustion, were characterized and tested to assess their capacity for CO2 adsorption at different temperatures. Neither the ashes nor their pellets were subject to prior thermochemical activation.The bottom ash sample and its pellets showed a higher adsorption capacity for the majority of the temperatures studied. The pelletized bottom ash reached the maximum adsorption capacity (0,07 mmol CO2/g), followed by the non-pelletized bottom ash (0,06 mmol CO2/g); both at an adsorption temperature of 25°C.CO2 adsorption of bottom ash, from the combustion of wheat bran (agricultural biomass), by a physical adsorption mechanism was demonstrated whereas with the fly ash sample, CO2 adsorption by both physical and chemical adsorption mechanisms was identified.

Highlights

The reduction of CO2 emissions in order to stabilize global warming has become a contemporary challenge (Hoyos Barreto et al 2008, Da Gama et al 2010, Wilcox 2012)
It can be noted that the pelletization process reduces the specific surface area of both samples, to 34% for the fly ash (FA) and to 58,3% for the bottom ash (BA)
Fly ash and bottom ash samples produced by an industrial process of wheat bran agricultural biomass combustion, in unprocessed powder and pelletized forms, have been physically and chemically characterized

Summary

Introduction

The reduction of CO2 emissions in order to stabilize global warming has become a contemporary challenge (Hoyos Barreto et al 2008, Da Gama et al 2010, Wilcox 2012). The process based on adsorption phenomena is considered to be one of the most promising technologies in terms of capturing CO2 from combustion gases (Arenillas et al 2005), giving rise to the possibility of an efficient separation in diluted gas mixtures (Wilcox 2012). Within this context, it is important to note the study of new low-cost adsorbents (Boumediene et al 2015) which may hold significant CO2 adsorption capacities

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