The carbonaceous by-product of biomass gasification processes is known as char. Although nowadays char is treated as a waste, it could be valorized as cheap precursor for activated carbons (ACs) due to their similarities in terms of physical-chemical properties and mechanism of formation. In particular, this study wants to assess char suitability as substitute/precursor of AC for CO2 adsorption. Five chars were taken from five different commercial biomass gasifiers installed in South-Tyrol (Italy) and characterized through elemental analysis, physisorption analysis, and scanning electron microscopy. CO2 adsorption/desorption capacity of chars were investigated through thermogravimetric analysis and their performances were compared with two commercial ACs selected as reference. The effects of adsorption temperature (Tads = 50–75–100 °C), CO2 concentration (CO2:N2 = 1:1–1:4), chemical activation (with KOH or ZnCl2), and adsorption cycles were investigated. The highest uptake (3.7%) was measured for char activated with KOH, at Tads = 50 °C and CO2:N2 = 1:1.
CO2 Adsorption study on pure and chemically activated chars derived from commercial biomass gasifiers / Benedetti, V; Cordioli, E; Patuzzi, F; Baratieri, M. - In: JOURNAL OF CO2 UTILIZATION. - ISSN 2212-9820. - 33:(2019), pp. 46-54. [10.1016/j.jcou.2019.05.008]
CO2 Adsorption study on pure and chemically activated chars derived from commercial biomass gasifiers
Benedetti V
Primo
;Patuzzi F;Baratieri M
2019-01-01
Abstract
The carbonaceous by-product of biomass gasification processes is known as char. Although nowadays char is treated as a waste, it could be valorized as cheap precursor for activated carbons (ACs) due to their similarities in terms of physical-chemical properties and mechanism of formation. In particular, this study wants to assess char suitability as substitute/precursor of AC for CO2 adsorption. Five chars were taken from five different commercial biomass gasifiers installed in South-Tyrol (Italy) and characterized through elemental analysis, physisorption analysis, and scanning electron microscopy. CO2 adsorption/desorption capacity of chars were investigated through thermogravimetric analysis and their performances were compared with two commercial ACs selected as reference. The effects of adsorption temperature (Tads = 50–75–100 °C), CO2 concentration (CO2:N2 = 1:1–1:4), chemical activation (with KOH or ZnCl2), and adsorption cycles were investigated. The highest uptake (3.7%) was measured for char activated with KOH, at Tads = 50 °C and CO2:N2 = 1:1.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione
