Toluene total oxidation over Pd and Au nanoparticles supported on hydroxyapatite - Université de Rennes Access content directly
Journal Articles Comptes Rendus. Chimie Year : 2016

Toluene total oxidation over Pd and Au nanoparticles supported on hydroxyapatite

Abstract

The total oxidation of toluene was carried out in a series of catalytic systems composed of either palladium or gold, as active phase, with hydroxyapatite as supports. The influence of different parameters on the catalytic reactivity was investigated: the type of support, the active phase content, the preparation method, and the nature of the active phase. Hydroxyapatite supports, impregnated by the active phase, showed better reactivities than that of the classical alumina one. Moreover, low palladium content (0.25 wt%) is enough to get high toluene conversions at low temperatures. Two preparation methods were used to introduce the active phase on the support: the conventional wet impregnation and the nanoparticle deposition achieved by impregnation of a colloidal suspension of the noble metal using the surfactant HEA16Cl. Introducing palladium by either of these methods leads to similar catalytic efficiencies. In addition to this, palladium is much more active than gold, gold was not probably present under the form of highly dispersed nanoparticles. X-ray Photoelectron Spectroscopy (XPS) evidenced PdO presence on the surface of all our catalysts. Palladium impregnated on apatite by conventional method showed an improvement of catalytic reactivity after 13 h under reacting mixture, probably because of Pd(0) formation besides PdO. As a result and after a literature survey, our catalysts could be classified among the most reactive systems towards total oxidation of toluene

Dates and versions

hal-01275484 , version 1 (17-02-2016)

Identifiers

Cite

Dayan Chlala, Madona Labaki, Jean-Marc Giraudon, Olivier Gardoll, Audrey Denicourt-Nowicki, et al.. Toluene total oxidation over Pd and Au nanoparticles supported on hydroxyapatite. Comptes Rendus. Chimie, 2016, 19 (4), pp.525-537. ⟨10.1016/j.crci.2015.07.015⟩. ⟨hal-01275484⟩
76 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More