Oxidative-reforming of methane and partial oxidation of methane reactions over nio/pro2/zro2 catalysts: effect of nickel content

• Autor(a) principal: Asencios, Yvan Jesus Olortiga [UNIFESP]
• Data de Publicação: 2016
• Outros Autores: Marcos, Francielle Candian Firmino, Assaf, Jose Mansur, Assaf, Elisabete Moreira
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNIFESP
• Texto Completo: https://dx.doi.org/10.1590/0104-6632.20160333s20150056; https://repositorio.unifesp.br/handle/11600/57573
• topic: Reforming methane; Partial-oxidation; Syngas; Nickel-content; Praseodymium

In this work the behavior of NiO-PrO2-ZrO2 catalysts containing various nickel loadings was evaluated in the partial oxidation of methane and oxidative-reforming reactions of methane. The catalysts were characterized by X-Ray Diffraction Analysis (in situ-XRD), Temperature Programmed Reduction (H-2-TPR), Scanning Electron Microscopy (SEM/EDX) and Adsorption-Desorption of nitrogen (BET area). The reactions were carried out at 750 degrees C and 1 atm for 5 hours. The catalysts were studied with different nickel content: 0, 5, 10 and 15% (related to total weight of catalyst, wt%). In both reactions, the catalyst containing the mixture of the three oxides (NiO/PrO2/ZrO2) with 15% nickel (15NiPrZr catalyst) showed the best activity for the conversion of the reactants into Syngas and showed high selectivity for H-2 and CO. The results suggest that the promoter PrO2 and the Ni degrees centers are in a good proportion in the catalyst with 15% Ni. Our results showed that low nickel concentrations in the catalyst led to high metallic dispersion; however, very low nickel concentrations did not favor the methane transformation into Syngas. The catalyst containing only NiO/ZrO2 in the mixture was not sufficient for the catalysis. The presence of the promoter PrO2 was very important for the catalysis of the POM.