Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 40, Issue 45, Pages 15460-15469Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2015.08.111
Keywords
Lignocellulosic biomass; Gasification; Alkali metal; Alkaline earth metal; Catalytic effects
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Funding
- National Science Foundation of China (NSFC) [51506070, 51176062]
- Hubei Natural Science Funds for Distinguished Young Scholar [2013CFA036]
- Independent Innovation Foundation of State Key Laboratory of Coal Combustion [FSKLCCB 1513]
- China Postdoctoral Science Foundation [2014M552038]
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This study aimed to understand the mechanism of dual catalytic effects of inherent alkali and alkaline earth metallic species (AAEMs) on biomass gasification. Two kinds of typical Chinese agricultural biomass were gasified using updraft quartz reactor with steam. The results indicated that external steam had negligible effects on promoting further thermal cracking or reforming of tar under 900 degrees C. The presence of AAEMs enhanced the production of H-2 and CO2, while inhibited the production of CO, CH4, C2H4 and C2H6. The heterogeneous char-steam reaction, as well as the homogeneous hydrocarbons reforming and water-gas shift reactions were promoted by the presence of AAEMs. Alkaline earth metals had more significant catalytic effects on water-gas shift reaction compared to alkali metals. The results from UV fluorescence spectra further proved that the additional steam had negligible promoting effects on secondary reforming of tar, while the inherent AAEMs had a significant catalytic role in thermal cracking and reforming of tars. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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