Biogas reforming to syngas over cu‐modified Ni‐Al‐LDH catalysts

Ni‐Al‐LDH catalyst was modified with Cu to improve catalyst activity and deactivation resistance in biogas reforming. The samples were obtained by impregnation of Cu on Ni‐Al previously prepared by coprecipitation, and characterized by X‐ray diffractometry, N2 physisorption, temperature‐programmed reduction, CO2 temperature‐programmed desorption, and temperature‐programmed oxidation. Catalytic tests were performed with CH4/CO2 = 1.5 at 600 and 700°C in a fixed bed reactor. The characterization results revealed that the presence of Cu facilitates the reduction of Ni2+ to Ni°. The washing step influences the properties of the catalyst, since samples with low Cu content showed greater activity and stability than catalysts with high Cu content. At 700°C, the best results were obtained with the unreduced catalyst, with CH4 conversions above 75%, because the reduction with H2 at such condition causes catalyst sintering. No deactivation was observed at 600°C. The results achieved by the unreduced catalysts show potential for the production of H2 as they do not require theactivation with H2. A mechanism for activating the catalyst with CH4 was proposed.

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