• BOONTIDA PONGTHAWORNSAKUN

      Articles written in Journal of Chemical Sciences

    • Preparation of TiO₂ supported Au–Pd and Cu–Pd by the combined strong electrostatic adsorption and electroless deposition for selective hydrogenation of acetylene

      BOONTIDA PONGTHAWORNSAKUN NISARAT WIMONSUPAKIT JOONGJAI PANPRANOT

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      TiO₂ supported Au–Pd and Cu–Pd catalysts were prepared by strong electrostatic adsorption (SEA) of Pd followed by electroless deposition (ED) of a second metal with incremental surface coverages of Au or Cu. High dispersion of small Pd particles on the Pd/TiO2 prepared by SEA led to the high amount of second metal deposition on Pd surface. The Cu addition by ED increased the relative ratio of linear CO adsorption mode indicating the presence of higher amount of isolated Pd atoms. The ensemble effect of the Cu–Pd/TiO₂ catalysts resulted in the improved catalytic performances in the selective hydrogenation of acetylene to ethylene. However, as revealed by the blue shift of CO-IR and XPS results, Au addition by ED rather exhibited the electronicmodification. The highest catalytic activity was obtained on the 1.10% Au–Pd/TiO₂ catalyst; however, the Cu addition (0.12% Cu–Pd/TiO₂, θCu = 0.37) showed interesting results as only a small amount of Cu was used to improve the catalyst performances. The bimetallic catalysts were also prepared by conventional impregnation for comparison purposes. These catalysts exhibited several drawbacks such as low Pd dispersion, formation ofsecond metal aggregates, and blockage of isolated Pd atoms.

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