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

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

机构：[1] School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Shanghai Engineering Research Center of Coal Gasification, Shanghai, 200237, 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：EI(收录号：20224513091942)

语种：英文

外文关键词：Amorphous carbon - Aromatic compounds - Carbon dioxide - Catalyst activity - Gasification - Raman spectroscopy

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 gasification 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. ? 2022