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6614585 
Journal Article 
Single-atom Pd dispersed on nanoscale anatase TiO2 for the selective hydrogenation of phenylacetylene 
Yang, Fu; Ding, S; Song, H; Yan, N; , 
2020 
SCIENCE PRESS 
BEIJING 
982-992 
WOS:000538379400009 
Combining the advantages of both heterogeneous and homogeneous catalysts, single-atom catalysts (SACs) with unique electronic properties have shown excellent catalytic properties. Herein, we report single-atom Pd dispersed on na-noscale TiO2 prepared by self-assembly method as efficient and selective catalysts for the hydrogenation of phenylacetylene to styrene. The catalysts were characterized by N-2 adsorption/desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and X-ray absorption spectroscopy (XAS). 0.2Pd-TiO2(150 degrees C) possessing dominant single-atom Pd species, exhibited a turnover frequency (TOF) of over 8000 h(-1) with 91% selectivity towards styrene at room temperature. Further increasing Pd loading from 0.2% to 0.5% and 1.5% resulted in the decrease of activity probably due to the formation of Pd nanoparticles. Besides, the 0.2Pd-TiO2 prepared by self-assembly strategy showed better catalytic performance than commercial 10%Pd/C and 0.2Pd-TiO2 synthesized by using impregnation method.