Effect of gold on a NiLaO3 perovskite catalyst for methane steam reforming
•Influence of gold addition to Ni catalysts in the catalytic activity in the steam reforming of methane.•Enhanced stability of gold containing nickel catalysts.•Lowest carbonaceous deposit formation.
The effect of gold addition to a supported Ni SRM catalyst has been studied in this work in order to determine the influence of gold on both the amount and type of carbon species formed during the reaction. The structure of the support, a mixed La–Al perovskite, determines the catalyst reducibility and Ni particle size. Gold addition affects the metal particle size increasing metal dispersion on increasing the gold content. Therefore, although gold blocks step Ni sites, the more active sites for CH activation, and increases electron density on nickel, the higher dispersion results in an apparently higher activity upon gold addition. Moreover, gold addition increases the catalyst stability by decreasing the rate of growth of carbon nanotubes.
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Journal: Applied Catalysis B: Environmental - Volume 144, January 2014, Pages 846–854