Influence of the Urea Content in the Combustion Synthesis for Preparation of NiAl₂O₄ Support Catalytic to Steam Reforming of Methane

Abstract:

The aim of this work is to evaluate the catalytic performance in steam reforming of methane of the NiAl₂O₄ catalysts prepared by combustion reaction with different urea levels. The catalysts were prepared with urea in the stoichiometric proportion, and with excess of 10% and 20%. The samples were characterized by DRX, textural analysis by nitrogen adsorption, SEM, TPR, and then, catalytically evaluated in the methane reforming reaction. The results showed the presence of NiAl₂O₄ and traces of NiO for all the samples. The increase of the urea content caused an increase in the particle size and a reduction in the surface area, from 171 to 35 m²/g. All the samples presented irregular morphology. The TPR curves showed peaks of reduction of the NiO species, and reduction of nickel present in the NiAl₂O₄. Regarding the conversion of methane to synthesis gas, it was observed that the increase of the urea content allowed obtaining higher conversion. However, it was also observed a rapid deactivation of these catalysts due to high coke deposition on the active phases surfaces.

• Periodical: Materials Science Forum (Volumes 727-728)
• Pages: 1249-1255
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.727-728.1249
• Online since: August 2012
• Authors: Elvia Leal, Heloysa Martins Carvalho Andrade, Ana Cristina Figueiredo de Melo Costa
• Keywords: Catalysis, Combustion Reaction, Nickel Aluminate, Urea

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