One step synthesis of Pt–Co/TiO2 catalysts by flame spray pyrolysis for the hydrogenation of 3-nitrostyrene

• Bimetallic Pt–Co/TiO2 catalysts were prepared by the FSP method with 0.1–0.5 wt.% Co.
• When reduced at 200 °C, Pt–Co/TiO2 exhibited higher ENB selectivity.
• ENB selectivity was correlated well with an increase of Pt terrace sites.
• Reduction at 500 °C resulted in a strong Pt–Co interaction and Pt–TiOx sites.
• Both NS conversion and selectivity of VA were greatly improved by R500.

Supported Pt–Co/TiO2 catalysts were prepared by single step flame spray pyrolysis with Pt at 0.5 wt.% and Co loadings varying at 0, 0.1, 0.2, and 0.5 wt.%. Their catalytic activity was tested in the selective hydrogenation of 3-nitrostyrene. Based on the infrared spectroscopy of adsorbed CO results, the addition of Co led to a higher amount of Pt terrace atoms being formed on the catalyst surface which promoted the selectivity towards ethylnitrobenzene. Nevertheless, the positive effect of Co addition can be observed when the catalysts were reduced at 500 °C. Both hydrogenation activity and selectivity of vinylaniline over Pt–Co/TiO2 were drastically increased and surpassed those of monometallic Pt/TiO2 due to the strong interaction between Pt–Co and the migration of TiOx species.

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