文献类型：期刊文献

英文题名：In-situ study on structure evolution and gasification reactivity of biomass char with K and Ca catalysts at carbon dioxide atmosphere br

作者：Wang, Xingjun[1,2];Chen, Qian[1];Zhu, Huaili[1];Chen, Xueli[1,2];Yu, Guangsuo[1,2]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[2]Shanghai Engn Res Ctr Coal Gasificat, Shanghai 200237, Peoples R China

年份：2023

卷号：6

期号：1

起止页码：27

外文期刊名：CARBON RESOURCES CONVERSION

收录：WOS:【ESCI(收录号:WOS:000888059200001)】；

语种：英文

外文关键词：In-situ Raman spectroscopy; K and Ca catalysts; Gasification reactivity; Structure evolution; Biomass char

摘要：The structural evolution and gasification reactivity of biochar prepared from the pyrolysis of wheat straw were investigated by in-situ Raman spectroscopy and thermogravimetric analysis. The Raman spectra consisted of a combination of four Lorentzian bands (D1, D2, D4, G) and one Gaussian band (D3) in the first-order region. The experimental results showed that the addition of catalysts or the presence of ash could improve the CO2 gasi-fication reactivity of biochar and result in a larger ID1/IG ratio and a lower IG/IALL ratio, meaning that the carbon structure was less ordered, and there were also more active sites such as amorphous carbon and cross-linked structures; Ca-based catalysts and K-based catalysts changed the evolution of biochar structure in a different way in CO2 atmosphere, the ID3/ID1 of Ca-based biochar was close to the value of non-catalyst biochar and decreased slowly, indicating that the Ca-based catalysts can stabilize the aromatic rings, while the IG/IALL of K- based biochar decreases significantly and the ID3/ID1 increased significantly, indicating the increase of carbon structure defects and the cracking of large aromatic rings in bio-char into small ones; a scheme of K and Ca reaction with biochar in CO2 gasification process was proposed