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Catalysts applied in biogas reforming: phases behavior study during the H2 reduction and dry reforming by in situ X-ray diffraction

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Abstract

Dry reforming of methane is an important route to reuse the CO2 and CH4 to obtain the syngas (CO + H2), which can be converted into several economically viable products. Generally, Ni-based catalysts are applied in dry reforming due to their low cost and high activity. Therefore, we propose the application of Ni-based catalysts dispersed in the mixed metal oxide (Ni-ZnAl, Ni-ZnAlZr and Ni-ZnZr) obtained from the calcination of the precursor synthesized via the co-precipitation method. Herein, carbon dioxide (CO2) and methane (CH4) conversions were recorded over time-on-stream for all catalysts, simulating the biogas composition (60% CH4 and 40% CO2). As a complementary analysis, we also study the catalysts during the H2 reduction and dry reforming by in situ X-ray diffraction (XRD). Carbon deposition on the surface of the catalysts was analyzed using X-ray diffraction, SEM images, Thermal analysis (TG) and Raman spectroscopy. In particular, the incorporation of Zr4+ into the materials provided the CH4 conversion, selectivity to hydrogen and stability of the phases during the reaction. On the other hand, the presence of a higher amount of basic sites in the Ni-ZnAl favored the CO2 conversion. In general, all samples showed the H2:CO product ratio less than a unit indicating the relevant contribution of parallel reactions. Thermal analysis showed that the amount of the deposited carbon post-reaction was lower on the surface of the Ni-ZnAl catalysts.

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Acknowledgements

We thank the Brazilian Agencies Coordination for the Improvement of Higher Education Personnel—CAPES; National Council for Scientific and Technological Development—CNPq (proposal number 158830/2018-0); FAPESP (proposal number 2015/06246-7) for the financial support for this work and the Brazilian Synchrotron Light Laboratory (LNLS) in Campinas, Brazil, for the XPD analysis [XPD—20150178].

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Correspondence to Elisabete Moreira Assaf.

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Bezerra, D.M., Ferreira, G.R. & Assaf, E.M. Catalysts applied in biogas reforming: phases behavior study during the H2 reduction and dry reforming by in situ X-ray diffraction. Braz. J. Chem. Eng. 39, 645–659 (2022). https://doi.org/10.1007/s43153-021-00213-3

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  • DOI: https://doi.org/10.1007/s43153-021-00213-3

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