期刊
BIORESOURCE TECHNOLOGY
卷 100, 期 20, 页码 4877-4883出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2009.05.009
关键词
Maize stalk; Pyrolysis; TGA/FTIR/SEM; Helium density; Adsorption/desorption
资金
- Major State Basic Research Development Program of China [2004CB217704]
- National Natural Science Foundation of China [50721005]
The structural evolution characteristics of maize stalk/char particles during pyrolysis were investigated. The char was prepared by pyrolyzing at temperatures ranging from 200 to 900 degrees C. Maize stalk and chars were characterized by thermogravimetric analysis, ultimate analysis (TGA), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), helium density measurement and N-2 adsorption/desorption method. The char yield decreased rapidly with increasing temperature Until 400 degrees C. As temperature increased, the char became progressively more aromatic and carbonaceous. The hydroxyl, aliphatic C-H, carbonyl and olefinic C=C groups were lost at high temperatures. Below 500 degrees C, the removal of volatile matter made pore opening. High temperatures led to the Occurrence of softening, melting, fusing and carbon structural ordering. The aromatization process started at similar to 350 degrees C and continued to higher temperatures. The shrinkage of carbon structure occurred above 500 degrees C, which was concurrent with the aromatization process. (C) 2009 Elsevier Ltd. All rights reserved
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