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dc.contributor.authorLin, X.
dc.contributor.authorWang, C.
dc.contributor.authorTian, B.
dc.contributor.authorZhang, Shu
dc.contributor.authorZhou, J.
dc.contributor.authorWang, Y.
dc.date.accessioned2017-08-24T02:17:17Z
dc.date.available2017-08-24T02:17:17Z
dc.date.created2017-08-23T07:21:48Z
dc.date.issued2013
dc.identifier.citationLin, X. and Wang, C. and Tian, B. and Zhang, S. and Zhou, J. and Wang, Y. 2013. Effects of de-ashing on the micro-structural transformation and CO<inf>2</inf> reactivity of two Chinese bituminous coal chars. Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology. 42 (6): pp. 1040-1046.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/55140
dc.description.abstract

Two Chinese bituminous coals were de-ashed by hydrochloric and hydrofluoric acids; and their gasification reactivity with CO 2 were investigated using isothermal thermo-gravimetric method at constant temperatures of 900-1200°C, respectively. The effects of micro-structural transformation of coal chars before and after de-ashing were analyzed using X-ray diffraction (XRD) and laser Raman. Results indicate that the de-ashing treatment gives rise to the partial damage of carbon structure, and then forming more amorphous carbon during pyrolysis. Such amorphous carbon with high D band fractions of Raman spectrum demonstrate relatively less regular structure. The disordered structure allows more gasification agent (i. e. CO 2 ) penetrate into the inner of char, which probably promotes the gasification reactivity of it. The nano-rod structure forms during the raw coal char CO 2 gasification by the strong polymerization of pyrolysis gas. The de-ashing process is considered to diminish the support point for secondary polymerization, which causes more decomposition. The conversion ratio and reaction rate are increased. As a result, the reactivity of Shenhua coal char exhibits less change after de-ashing due to the competitive effect between vanishing of catalysis of ash and micro-structural transformation of char; in contrast, the reactivity of Yanzhou coal char after de-ashing presents apparent improving because of the less catalysis of ash and more micro-structural damage.

dc.titleEffects of de-ashing on the micro-structural transformation and CO<inf>2</inf> reactivity of two Chinese bituminous coal chars
dc.typeJournal Article
dcterms.source.volume42
dcterms.source.number6
dcterms.source.startPage1040
dcterms.source.endPage1046
dcterms.source.issn1000-1964
dcterms.source.titleZhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology
curtin.departmentFuels and Energy Technology Institute
curtin.accessStatusFulltext not available


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