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Open AccessArticle

Gasification under CO2–Steam Mixture: Kinetic Model Study Based on Shared Active Sites

by Xia Liu, Juntao Wei, Wei Huo and Guangsuo Yu *
Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Energies 2017, 10(11), 1890;
Received: 16 October 2017 / Revised: 10 November 2017 / Accepted: 15 November 2017 / Published: 17 November 2017
(This article belongs to the Special Issue Biomass Chars: Elaboration, Characterization and Applications Ⅱ)
In this work, char gasification of two coals (i.e., Shenfu bituminous coal and Zunyi anthracite) and a petroleum coke under a steam and CO2 mixture (steam/CO2 partial pressures, 0.025–0.075 MPa; total pressures, 0.100 MPa) and CO2/steam chemisorption of char samples were conducted in a Thermogravimetric Analyzer (TGA). Two conventional kinetic models exhibited difficulties in exactly fitting the experimental data of char–steam–CO2 gasification. Hence, a modified model based on Langmuir–Hinshelwood model and assuming that char–CO2 and char–steam reactions partially shared active sites was proposed and had indicated high accuracy for estimating the interactions in char–steam–CO2 reaction. Moreover, it was found that two new model parameters (respectively characterized as the amount ratio of shared active sites to total active sites in char–CO2 and char–steam reactions) in the modified model hardly varied with gasification conditions, and the results of chemisorption indicate that these two new model parameters mainly depended on the carbon active sites in char samples. View Full-Text
Keywords: gasification; kinetic model; active site; chemisorption gasification; kinetic model; active site; chemisorption
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Liu, X.; Wei, J.; Huo, W.; Yu, G. Gasification under CO2–Steam Mixture: Kinetic Model Study Based on Shared Active Sites. Energies 2017, 10, 1890.

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