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In-situ study on structure evolution and gasification reactivity of biomass char with k and ca catalysts at carbon dioxide atmosphere

引用

carbon Resources Conversion 2023年第1期6卷 27-33页

作者： Xingjun Wang Qian Chen Huaili Zhu Xueli Chen Guangsuo Yu School of Resources and Environmental Engineering East China University of Science and TechnologyShanghai 200237China Shanghai Engineering Research Center of Coal Gasification Shanghai 200237China

The structural evolution and gasification reactivity of biochar prepared from the pyrolysis of wheat straw were investigated by in-situ Raman spectroscopy and thermogravimetric *** Raman spectra consisted of a combination of four Lorentzian bands(D1,D2,D4,G)and one Gaussian band(D3)in the first-order *** experimental results showed that the addition of catalysts or the presence of ash could improve the CO_(2) 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 CO_(2) 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 CO_(2) gasification process was proposed.

关键词： In-situ Raman spectroscopy k and ca catalysts Gasification reactivity Structure evolution Biomass char

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