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Influence of CO2 atmosphere on property of biochar from pyrolysis of cellulose.
- Source :
- Journal of Environmental Chemical Engineering; Jun2022, Vol. 10 Issue 3, pN.PAG-N.PAG, 1p
- Publication Year :
- 2022
-
Abstract
- CO 2 is a reactive gas frequently used for converting biomass or biochar into carbon materials with developed structures at high temperatures. However, at the temperatures (400–700 °C) typically employed for pyrolysis, CO 2 might also involve in pyrolysis and impact properties of the biochar formed, which was investigated in this study with cellulose as feedstock and N 2 or CO 2 as the carrier gas. The results indicated that CO 2 promoted the formation of biochar below 600 °C by suppressing cracking of biochar and enhancing secondary condensation of the volatiles. This reduced the size and abundance of the organics with π-conjugated structures in the bio-oil. CO 2 as an atmosphere produced the biochar with a carbon content higher than that produced in N 2 by 9.96%, and correspondingly the oxygen content was lowered by 36.68% in the biochar, as CO 2 facilitated deoxygenation and dehydrogenation reactions during the pyrolysis. The presence of CO 2 in the pyrolysis also made the biochar more aromatic and thermally more stable, which enhanced both energy yield and energy density of the process. As the heating temperature increases, CO 2 as an atmosphere will significantly affect the evolution of the oxygen-containing function of the biochar surface. [Display omitted] • Impact of CO 2 on properties of biochar in pyrolysis of cellulose was studied. • CO 2 enhances formation of biochar but not the π-conjugated organics in bio-oil. • CO 2 suppresses cracking while enhances secondary condensation of volatiles. • CO 2 facilitates deoxygenation/dehydrogenation to produce carbon-rich biochar. • Evolution of functional groups of biochar is affected by N 2 /CO 2 atmospheres. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 22133437
- Volume :
- 10
- Issue :
- 3
- Database :
- Supplemental Index
- Journal :
- Journal of Environmental Chemical Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 157692184
- Full Text :
- https://doi.org/10.1016/j.jece.2022.107339