Effects of activation temperature on densities and volumetric CO2 adsorption performance of alkali-activated carbons

Tailoring Low-Cost Granular Activated Carbons Intended for CO2 Adsorption

“…If taken on a gravimetric basis, the CO 2 uptakes obtained in the present work were lower than those usually reported in the literature for ACs prepared by chemical activation with KOH. For example, the highest values we attained at 1.0 and 0.15 bar were ~5.00 and 2.00 mmol/g, respectively, whereas the corresponding values reported by Li et al ( 2019 ) for petroleum coke-based ACs were 6.47 and 2.52 mmol/g. Notwithstanding, if a volumetric basis is taken into account, the differences disappear.…”

“…However, considering that the adsorbent has to be confined in a given column with limited volume, so it is much more relevant, from an application point of view, to evaluate the data on a volume basis rather than on a mass basis. This issue was firstly considered by Silvestre-Albero et al ( 2011 ); however, as far as we know, since then only Li et al ( 2019 ), Haffner-Staton et al ( 2016 ), and Marco-Lozar et al ( 2012 ) have reported the CO 2 uptake of ACs on a volumetric basis.…”

“…(i) Firstly, quite large amounts of KOH (a caustic and highly corrosive chemical) are employed in the activation process. Usual KOH:precursor ratio are in the range of 1 to 4, which can be considered unviable for a large-scale production (see, just as few examples, the works of Wahby et al, 2010 ; Deng et al, 2014 ; Parshetti et al, 2015 ; Haffner-Staton et al, 2016 ; Hong et al, 2016 ; Huang et al, 2019 ; Kutorglo et al, 2019 ; Li et al, 2019 ).…”

Analysis on Preparation, Application, and Recycling of Activated Carbon to Aid in COVID-19 Protection

“…Different parameters like pore diameter, hardness, density, iodine number, and ash contents make them appropriate for specific applications. Also, ACs have remediable pores with tunable surface chemistry, chemical/thermal steadiness, and high accessibility [32]. AC contains different functional groups of aromatic rings that maintain the chemical properties.…”

“…These pollutant gases cause respiratory diseases, lung infection, breathing problems, cough, heart disease, and paralysis [60]. The removal efficiency depends on the characteristics of the feedstock (petroleum coke, coal, biomass), activators (potassium hydroxide, carbon dioxide, and phosphoric acid), and process variables (activation temperature, the ratio of activator to feedstock) [32].…”