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

Abstract : A series of Pt-100 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. H-2-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 H-2-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. H-2-TPD analysis supports these findings.
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Submitted on : Wednesday, March 22, 2017 - 1:52:55 PM
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N. H. H. Abu Bakar, M. M. Bettahar, M. Abu Bakar. The Influence of Supports on the Surface Properties of PtNi Bimetallic Catalysts. PROGRESS IN MATERIALS AND PROCESSES, PTS 1-3, 2013, Unknown, Unknown Region. pp.1716-1724, ⟨10.4028/⟩. ⟨hal-01493929⟩



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