Abstract
The H2-treated TiO2 supported Pt catalysts were prepared by strong electrostatic adsorption method and tested in the liquid-phase selective hydrogenation of various organic compounds such as 3-nitrostyrene to vinylaniline (VA) and furfural to furfuryl alcohol (FA). A combination of high Pt dispersion, strong interaction of Pt-TiOx, and the presence of low coordination Pt sites was necessary for high hydrogenation activity. However, while the selectivity of VA in 3-nitrostyrene hydrogenation did not depend much on the catalyst preparation method used, the selectivity of FA in furfural hydrogenation was much higher when the catalysts were prepared by SEA, comparing to those obtained by impregnation in which the solvent product was formed, due probably to the non-acidic conditions used during Pt loading by SEA method.
Highlights
Many intermediates for the production of herbicides, pesticides, cosmetics, pharmaceuticals, vitamins, food flavors, and many commercially important organic fine chemicals are synthesized via selective hydrogenation under liquid-phase conditions
The catalytic properties of Pt/TiO2 catalysts in the selective hydrogenation of 3-NS to VA and the selective hydrogenation furfural to furfuryl alcohol (FA) were improved by the combined Strong electrostatic adsorption (SEA) method and the
Pt-TiOx, and low coordination Pt sites, which promoted the hydrogenation activities especially the hydrogenation of the –NO2 group, which was more difficult to be hydrogenated than the C=O and the C=C
Summary
Many intermediates for the production of herbicides, pesticides, cosmetics, pharmaceuticals, vitamins, food flavors, and many commercially important organic fine chemicals are synthesized via selective hydrogenation under liquid-phase conditions. The heterogeneous catalysts is valuable for organic transformations in highly selective reaction improvement based on green sustainable chemistry. NS includes two reducible functional groups which could be hydrogenated simultaneously [1,2,3]. Pt-based catalysts are an interesting choice and widely used in the NS hydrogenation due to their high catalytic activity. The catalysts can hydrogenate both functional groups, leading to undesired products [2,3,4]. The catalytic performance of Pt-based catalysts in the selective hydrogenation of NS has been improved by changing conditions of pretreatment [5,6], reaction mediums [2,5], catalyst supports [2], and the addition of modifiers [7]. Recent studies from our group showed that Pt/TiO2 [1]
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