Drastic changes in biomass char structure and reactivity upon contact with steam
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An Australian cane trash biomass was pyrolysed by heating at a slow heating rate to 700–900 °C in an inert gas atmosphere. The chars were then gasified in situ with steam. Our results indicate that the gasification of char with steam, even only for 20 s when the char conversion was minimal, resulted in drastic reduction in the intrinsic reactivity of char with air at 400 °C. The decreases in the char reactivity were not mainly due to the possible volatilisation of inherent catalysts during gasification in steam. Instead, the FT-Raman spectroscopy of the chars showed that the gasification of char with steam resulted in drastic changes in char structure including the transformation of smaller ring systems (3–5 fused rings) to large ring systems (>6 fused rings). It is believed that the intermediates of char–steam reactions, especially H, penetrated deep into the char matrix to induce the ring condensation reactions.
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Effects of steam on the reactivity and microstructure of char from in-situ gasification of brown coalXu, X.; Wang, Y.; Chen, G.; Chen, Z.; Qin, Z.; Dai, J.; Zhang, Shu; Xu, D. (2015)©, 2015, Science Press. All right reserved. To examine the effects of steam on the char reactivity and its microstructure, experiments of drying and pyrolysis of brown coal as well as the in-situ gasification of "hot" ...
Xu, X.; Wang, Y.; Chen, Z.; Bai, L.; Zhang, K.; Yang, S.; Zhang, Shu (2015)©, 2015, Science Press. All right reserved. This paper was to examine the changes in structure and reactivity of chars upon to varied cooling approaches for “hot” char derived from Shengli brown coal. The “hot” chars ...
Variations in char structure and reactivity due to the pyrolysis and in-situ gasification using Shengli brown coalXu, X.; Wang, Y.; Chen, Z.; Chen, X.; Zhang, H.; Bai, L.; Zhang, Shu (2015)© 2015 Elsevier B.V. All rights reserved. The initial reacting environment (such as temperature) could be highly important for determining the properties of char that is formed almost instantly when coal is fed into a hot ...