The Influence of Supports on the Surface Properties of PtNi Bimetallic Catalysts

Abstract:

A series of Pt₁₀₀ and bimetallic PtNi catalysts were prepared on various supports namely amorphous silica (Degussa), crystalline silica (Chempure) and cerium oxide (CeO₂). The samples were prepared via precipitation method using NaBH₄ as a reducing agent. H₂-TPR analysis revealed that total reduction of the metal salts to metal particles occurred during this stage. All catalysts were tested for the hydrogenation of benzene to cyclohexane. It was found that the catalysts exhibited a decrease in the catalytic reactivity in the order of amorphous silica, crystalline silica and CeO₂. This is mainly due to the surface area and acidity of the support. Comparison of the PtNi catalysts with their respective monometallic catalyst showed that only the PtNi prepared on Chempure exhibited an enhanced reactivity. This is due to alloying of PtNi. For catalysts prepared on Degussa, the low H₂-chemisorption properties as well as lack in Pt peak shift in the XRD profiles leads to the believe that Ni and Pt may exist separately. H₂-TPD analysis supports these findings.

• Periodical: Advanced Materials Research (Volumes 602-604)
• Pages: 1716-1724
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.602-604.1716
• Online since: December 2012
• Authors: Noor Hana Hanif Abu Bakar, Mohammed M. Bettahar, Mohamad Abu Bakar
• Keywords: Benzene, Hydrogenation, PtNi Catalyst, Support Effect, Surface Characteristic

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