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Kinetic Study of Carbon Dioxide Gasification of Rice Husk Fast Pyrolysis Char
- Alvarez, Jon, Lopez, Gartzen, Amutio, Maider, Bilbao, Javier, Olazar, Martin
- Energy & Fuels 2015 v.29 no.5 pp. 3198-3207
- carbon dioxide, gasification, kinetics, models, pyrolysis, rice hulls, temperature, thermogravimetry
- The rice husk char gasification kinetics with carbon dioxide has been studied in a thermogravimetric analyzer (TGA) under isothermal and dynamic regimes. The effect of the carbon dioxide concentration (50, 75, and 100 vol %) and heating rate (5, 10, and 20 °C min–¹) was determined in the dynamic runs, and the effect of the temperature (750, 800, and 850 °C) was determined in the isothermal runs. Rice husk char gasification has a complex kinetic behavior, with reactivity being strongly dependent upon the temperature and char conversion. The experimental results have been fitted to four different kinetic models, namely, homogeneous, nth order, random pore model and modified random pore model. The random pore model is the model that provides the best fit to the experimental evolution.