Oxidative reforming of model biogas over NiO–Y2O3–ZrO2 catalysts

Authors: Yvan J.O. Asencios, Cristiane B. Rodella, Elisabete M. Assaf

Abstract:
Catalysts composed of NiO/Y₂O₃/ZrO₂ mixtures were synthesized by the polymerization method in a single step. They were characterized by X-ray diffraction (XRD), temperature-programmed reduction (TPR), physisorption of N₂ (BET) and X-ray photoelectron spectroscopy (XPS) and then tested in the oxidative reforming of a model biogas (1.5CH₄:1CO₂) in the presence of oxygen (1.5CH₄ + 1CO₂ + 0.25O₂) at 750^◦C for 6 h. It was observed that the catalysts Ni20YZ and Ni40YZ performed better in catalytic processes than NiO/ZrO₂ and NiO/Y₂O₃, synthesized under the same conditions. The formation of Y₂O₃–ZrO₂ and NiO–Y₂O₃ solid solutions increased the rates of conversion of the reactants (CH₄ and CO₂) into synthesis gas (H₂ + CO). The formation of oxygen vacancies (in samples containing ZrO₂ and Y₂O₃) seemed to promote removal of the coke deposited on the nickel surface during the oxidative reforming of model biogas. The H₂/CO ratios in the reaction products formed on the best catalysts were 1:1, which is desirable for their direct use in the STD and in the Fischer–Tropsch processes.

Keywords:
NiO–Y₂O₃–ZrO₂ catalysts
Polymerization method
Reforming reaction
Model biogas
Synthesis gas

Published in: Applied Catalysis B: Environmental (Volumes 132–133, Pages 1-552, 27 March 2013)

Publisher: Elsevier  

ISSN Information: 0926-3373

Oxidative reforming of model biogas over NiO–Y2O3–ZrO2 catalysts

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