Rh(0) colloids supported on TiO2: a highly active and pertinent tandem in neat water for the hydrogenation of aromatics

Abstract

International audienceTiO2-supported Rh(0) nanoparticles were easily prepared in one step without calcination by a room temperature impregnation of the inorganic support with a prestabilized colloidal Rh(0) suspension. They are highly active and reusable catalysts for the hydrogenation of aromatics and chloroanisole derivatives in neat water with TOFs up to 33000 h−1. The comparison with the analogous silica system Rh@SiO2 was discussed showing higher catalytic selectivities and activities with Rh(0) colloids supported on TiO2

Efficient catalytic ozonation by ruthenium nanoparticles supported on SiO 2 or TiO 2 : Towards the use of a non-woven fiber paper as original support

“…TEM analyses (Supporting Information) have showed that the well-dispersed preformed Ru particles possess sizes around 2.25 nm and from previous works, we could presume that similar sizes were obtained after heterogeneization on the inorganic support [25]. BET surface area has been measured by nitrogen physisorption.…”

“…Three different supports were used for the heterogeneization of Ru (0) The Ru(0) nanospecies were deposited on these various supports through a wet impregnation methodology, already reported in the literature [25,26,29]. First, 100 mL of an aqueous suspension of ruthenium NPs was prepared by reducing ruthenium chloride precursor (3.8 x 10 -4 mol RuCl 3 .…”

“…This good efficiency of ruthenium species (2% wt) coated on cerium dioxide by impregnation has already been reported in the literature [24]. Here, the deposition was performed through a mild and easy procedure based on a wet impregnation of wellcontrolled nanometric size metal particles, as previously described [25,26].…”

“…Gaseous ozone was produced at approximately 100 g Nm -3 with a Trailigaz ozone generator fed with pure oxygen. Dissolved ozone at saturation concentrations used was analyzed before each experimentation with 3 withdrawals using 25 …”

Nanocatalysts for Hydrogenation Reactions

“…63 These nanocatalysts can be prepared by calcinations and are based on a room temperature impregnation of the inorganic support with the Rh-NPs. This is a relatively simple, environmentally friendly, and reproducible synthetic method compared to other methods.…”