Resumo

ALBIS ARRIETA, Alberto et al. Catalytic effect of zinc sulfate and ferric sulfate on lignin pyrolysis. Prospect. [online]. 2018, vol.16, n.1, pp.41-50. ISSN 1692-8261.  https://doi.org/10.15665/rp.v16i1.1397.

Using the thermogravimetric analysis technique, the effect of ferric sulfate and zinc sulfate on the pyrolysis process of lignin was studied at three different heating rates. It was found that the pyrolysis of pure lignin is barely affected with the change of heating rates from 10 to 100 °C/min, unexpected due to the kinetic nature of pyrolysis. The pyrolysis kinetics of this major component of biomass was evaluated by using three methods: n reaction order differential method, isoconversional method, and the distributed activation energy model, DAEM. The best fit, which allowed calculating acceptable kinetic parameters, was obtained from the last method. Results show the influence of the catalysts and the heating rate on the lignin pyrolysis processes, which is confirmed by the change in the kinetic parameters. Results suggest that ferric sulfate and zinc sulfate change the kinetic mechanism of lignin pyrolysis.

Palavras-chave : Catalysis; Lignin; Thermogravimetric analysis; Pyrolysis.

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