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Catalytic effects of inherent AAEM on char gasification: A mechanism study using in-situ Raman
Institute of Clean Coal Technology, East China University of Science and Technology, 200237 Shanghai, PR China.
Institute of Clean Coal Technology, East China University of Science and Technology, 200237 Shanghai, PR China.
Department of Mechanical Engineering, Faculty of Engineering Kasetsart University 50 Ngam Wong Wan Rd., Lat Yao, Chatuchak, Bangkok 10900, Thailand.
Institute of Clean Coal Technology, East China University of Science and Technology, 200237 Shanghai, PR China; Shanghai Institute of Pollution Control and Ecological Security, 200092 Shanghai, PR China.
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2022 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 238, part C, article id 122074Article in journal (Refereed) Published
Abstract [en]

Despite a small proportion of mineral in coal, inherent alkali and alkaline earth metals (AAEM) catalytically affected thermal conversion of coal. The gasification of raw and leached coal char was investigated by using an operando microscopic Raman spectroscopy to explore the effect of content and chemical form of the inherent AAEM on morphology and carbon structure evolution of a single particle during in-situ char gasification. The removal of water-soluble and ion-exchangeable AAEM reduced the R0.5 of SF, NM and YN char by 53.31%, 49.09% and 35.02%, respectively. As a result, the shrinkage of leached coal char progressed slower than that of the raw coal char. Besides, both water-soluble and ion-exchangeable AAEM accelerated char gasification because of an inhibition of the orderly evolution of carbon structure. Higher gasification temperature weakened the catalytic performance of ion-exchangeable AAEM. With the consumption of carbon, carbon microcrystalline structure of the residual char tended to be ordered, which led to a decrease in active free carbon sites for gasification reaction. Kinetic analysis indicated both water-soluble and ion-exchangeable AAEM reduced the activation energy of SF, NM and YN char by 20.97, 20.82 and 9.38kJ∙mol-1, respectively, and the effect of ion-exchangeable AAEM was more significant.

Place, publisher, year, edition, pages
Elsevier, 2022. Vol. 238, part C, article id 122074
Keywords [en]
gasification, operando Raman, in-situ characterization, catalytic mechanism
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-87104DOI: 10.1016/j.energy.2021.122074ISI: 000701789000013Scopus ID: 2-s2.0-85115180165OAI: oai:DiVA.org:ltu-87104DiVA, id: diva2:1595029
Note

Validerad;2021;Nivå 2;2021-09-23 (alebob);

Forskningsfinansiär: National Natural Science Foundation of China (21878093); National Key R&D Program of China (2017YFB0602601); Fund of Shanghai Science and Technology Committee (20230742400, 20PJ1402800); Fundamental Research Funds for the Central Universities (JKB012011013)

Available from: 2021-09-17 Created: 2021-09-17 Last updated: 2021-12-13Bibliographically approved

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Umeki, Kentaro

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