Real-time monitoring of alkali release during CO2 gasification of different types of biochar

Ge, Yaxin,1992Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology,Univ Gothenburg, Dept Chem & Mol Biol, Atmospher Sci, SE-41296 Gothenburg, Sweden. (author)

QC 20220926
Potassium and sodium compounds play both positive and negative roles during biomass gasification, but the detailed behavior of alkali metal compounds remain incompletely understood. In this study, alkali release during CO2 gasification of biochar is characterized online with a surface ionization method in combination with thermogravimetric analysis of the char samples undergoing gasification. For wood chars, the alkali release rate follows a slowly decreasing trend as the char conversion proceeds, but increases by up to two orders of magnitude when the conversion approaches completion. In contrast, the alkali release from straw char is 40-50 times higher than observed for wood char and decreases continuously during the whole gasification process. A high temperature and a high CO2 concentration enhance both alkali release and char reactivity. The char preparation method also influences the alkali release from pine char, while the char reactivity is less affected. Alkali release and char reactivity are linked, but other factors including mineral content, surface area and char structure may play important roles for the observed reactivity. The results provide a basis for understanding of alkali behavior during gasification and may help optimize catalytic effects and reduce detrimental issues in biomass gasification.

Ding, SaimanKTH,Kemisk apparatteknik(Swepub:kth)u1h6ar5q (author)
Kong, XiangruiGothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology,Univ Gothenburg, Dept Chem & Mol Biol, Atmospher Sci, SE-41296 Gothenburg, Sweden.(Swepub:gu)xkonxi (author)
Kantarelis, Efthymios,PhD,1982-KTH,Kemiteknik(Swepub:kth)u1yi2293 (author)
Engvall, KlasKTH,Processteknologi(Swepub:kth)u1ev1mf1 (author)
Pettersson, Jan B. C.,1962Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology,Univ Gothenburg, Dept Chem & Mol Biol, Atmospher Sci, SE-41296 Gothenburg, Sweden.(Swepub:gu)xpettj (author)
Göteborgs universitetInstitutionen för kemi och molekylärbiologi (creator_code:org_t)

By the author/editor: Ge, Yaxin, 1992; Ding, Saiman; Kong, Xiangrui; Kantarelis, Efth ...; Engvall, Klas; Pettersson, Jan ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Energy Engineeri ...

AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Other Agricultur ...; and Renewable Bioene ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Industrial Biote ...; and Bioenergy

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Chemical Enginee ...; and Chemical Process ...

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