Oxidation of glycerol using titania supported Au-Pd bimetallic catalysts

Effect of Au-Pd ratios on catalytic performance

Ainol Hayah Ahmad Nadzri, Noraini Hamzah, Nik Idris Nik Yusoff, Mohd. Ambar Yarmo

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Oxidation of glycerol to form various types of short chain oxygenated derivative compounds became an important reaction to support biodiesel industries. In this study, bimetallic AuPd catalysts supported on TiO 2 with different Au/Pd atomic ratios have been successfully prepared by deposition-precipitation method with urea decomposition. The catalysts were tested in the glycerol oxidation reactions in order to examine the effect of AuPd ratio on the conversion and selectivity. Catalytic activity of all the catalysts were as follow: Au7Pd3/TiO2 > Au5Pd5/TiO2 > Au8Pd 2/TiO2 > Au9Pd1/TiO2 > Au6Pd4/TiO2. Analysis by XRD revealed the presence of metallic Au and gold-enriched AuPd alloy phase which were located between the [111] and [200] peaks of Au and Pd in the AuPd bimetallic catalysts. XPS analysis ascertained the formation of Au0, Au3+, Pd0 and PdO species together with AuPd alloy phase in the bimetallic AuPd catalysts. This shows that the catalytic activity of the catalysts was depended to the formation of mixture of active species namely Au0, Au3+, Pd0 dan PdO together with the presence of "synergisti" effect in the AuPd alloy. The reactions were performed at low and high temperatures (50°C and 100°C) and it was found that the selectivity to tartronic acid was enhanced at lower reaction temperature. The highest selectivity to tartronic acid (55% at 99% conversion) was obtained by using Au9Pd1/TiO2 at 50°C and after 8 h of reaction time.

Original languageEnglish
Pages (from-to)309-313
Number of pages5
JournalFunctional Materials Letters
Volume4
Issue number3
DOIs
Publication statusPublished - Sep 2011

Fingerprint

Glycerol
Titanium
Oxidation
Catalysts
Catalyst activity
Biofuels
Acids
Catalyst selectivity
Biodiesel
Catalyst supports
Urea
Gold
X ray photoelectron spectroscopy
titanium dioxide
Derivatives
Decomposition
Temperature
Industry
tartronic acid

Keywords

  • Bimetallic catalyst
  • deposition-precipitation
  • gold
  • palladium

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Oxidation of glycerol using titania supported Au-Pd bimetallic catalysts : Effect of Au-Pd ratios on catalytic performance. / Ahmad Nadzri, Ainol Hayah; Hamzah, Noraini; Nik Yusoff, Nik Idris; Yarmo, Mohd. Ambar.

In: Functional Materials Letters, Vol. 4, No. 3, 09.2011, p. 309-313.

Research output: Contribution to journalArticle

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