Raman spectroscopic investigations into links between intrinsic reactivity and char chemical structure
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Many factors affect the gasification reactivity of chars. These include physical structure (e.g., surface area and pore structure), catalytically active inorganic species, and chemical structure (the extent of ring condensation of the carbonaceous matrix and the nature of the functional groups that comprise the char structure). This work uses Raman spectroscopy to investigate the relationships between the char chemical structure and intrinsic reactivity. Chars made from an Australianbituminous coal and a Chinese lignite at temperatures of 900 and 1100 °C were characterized in terms of their intrinsic reactivities with CO2 and H2O (separately). Unreacted and partially reacted chars were characterized using Raman spectroscopy and gas adsorption to determine chemical structure indicators and surface area, respectively. The ratio of small to large aromaticrings decreased with increasing carbon conversion for all chars in all reactants, and for the bituminous coal char, this was related to the reactivity behavior as a function of conversion. While reaction seemed to affect the structure of the lignite chars in a similar manner, this did not influence the intrinsic reactivity of the lignite chars to the same extents, perhaps because of the significantinfluence of catalytic activity of inorganic species.
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Wang, M.; Roberts, D.; Kochanek, M.; Harris, D.; Chang, L.; Li, Chun-Zhu (2013)Raman spectroscopy has been widely used to study chemical structures of chars and further our understanding of their behaviour under combustion and gasification conditions. This paper explores the impact of devolatilisation ...
Raman spectroscopic investigations into links between intrinsic reactivity and char chemical structureWang, M.; Roberts, D.; Kochanek, M.; Harris, D.; Chang, L.; Li, Chun-Zhu (2013)There are a large number of factors affecting the gasification reactivity of chars, including physical structure (e.g. surface area and pore structure), catalytically-active mineral matter, and chemical structure which ...
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 ...