Synthesis and characterization of bimetallic nanocatalysts and their application in selective hydrogenation of citral to unsaturated alcohols (original) (raw)

TiO 2-supported bimetallic nanocatalysts were prepared and reduced at two different temperatures , 375 • C and 575 • C for selective hydrogenation of citral to corresponding unsaturated alcohols (geraniol (GOL) and nerol (NOL)). The nanocatalysts were characterized by difference techniques of Fourier transform infrared spectroscopy (FT-IR), Brunauer, Emmett and Teller (BET) surface area measurement, scanning electron microscopy (SEM), Energy Dispersive X-ray Analysis (EDAX), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The prepared nanocatalysts are uniformly dispersed with an average particle size of 50–100 nm and zero valence metallic state. Catalysts reduced at higher temperature lead to an increase in selectivity toward unsaturated alcohols (GOL and NOL). The Pt–Ru/TiO 2 shows higher activity compared to Pt–Pd/TiO 2 and Pt–Au/TiO 2 nanocatalysts. In addition, a second metal (Ru) also leads to an increase in GOL and NOL selectivity during citral hydrogenation. Partially generated oxidized second metal species due to the difference in electronegativity, strongly binds the C=O group and also paves the way for selective activation of C=O bond.

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