Effect of the Chemical Composition of Mesoporous Cerium-Zirconium Oxides on the Modification with Sulfur and Gold Species and Their Application in Glycerol Oxidation

Piotr Kaminski

doi:10.20944/preprints201711.0106.v1

Preprint Article Version 1 This version is not peer-reviewed

Effect of the Chemical Composition of Mesoporous Cerium-Zirconium Oxides on the Modification with Sulfur and Gold Species and Their Application in Glycerol Oxidation

Piotr Kaminski ^*

Version 1 : Received: 15 November 2017 / Approved: 16 November 2017 / Online: 16 November 2017 (05:37:10 CET)

A peer-reviewed article of this Preprint also exists.

Kaminski, P. Effect of the Chemical Composition of Mesoporous Cerium-Zirconium Oxides on the Modification with Sulfur and Gold Species and Their Application in Glycerol Oxidation. ChemEngineering 2017, 1, 18. Kaminski, P. Effect of the Chemical Composition of Mesoporous Cerium-Zirconium Oxides on the Modification with Sulfur and Gold Species and Their Application in Glycerol Oxidation. ChemEngineering 2017, 1, 18.

Journal reference: ChemEngineering 2017, 1, 18
DOI: 10.3390/chemengineering1020018

Abstract

Ceria, zirconia and mixed cerium-zirconium mesoporous oxides were synthesized and used as supports for sulfur and gold species. The materials were characterised using selected advanced techniques (ICP-OES, elemental analysis, XPS, XRD, N₂ adsorption and desorption isotherms, UV-vis, ATR-FTIR, TPR-H₂, TG-DTA) which allowed monitoring of the oxidation state of metals (cerium and gold) and the surface properties of the catalysts, in particular the concentration of the components on the surface and in the bulk of materials. The interactions between gold, sulfur and metals from oxides were considered. The goal of this work was studied the changes in the chemical composition of materials and the oxidation states of cerium species after the modification of oxides with sulfur and gold species and the estimation of the influence of these changes on the surface properties. The chemical composition of surface affects the mobility of surface oxygen and the oxidation state of cerium, which can play the role of redox sites (e.g. Ce³⁺/Ce⁴⁺ species), and therefore it strongly influences on the adsorption of hydrogen sulfide and then gold loading. Additionally, gold catalysts modified with sulfur species were tested in the reaction of glycerol oxidation in the liquid phase at basic conditions as the test reaction of the catalytic oxidation of organic pollutants from water.

Subject Areas

ceria; zirconia; gold; sulfur; catalysts characterisation; glycerol oxidation

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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