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Catalysis Science & Technology Vol - 4 Issue - 2

Catalysis Science & Technology Vol -3

Catalysis Science & Technology Vol -2

Catalysis Science & Technology Vol -1

The role of surface Zn²⁺ ions in the transesterification of vegetable oils over ZnO supported on Al₂O₃ and Fe₂O₃

Content Provider	Royal Society of Chemistry (RSC)
Author	Sivasanker, S. Thirunavukkarasu, K. Pandurangan, A. Sankaranarayanan, T. M. Shanthi, R. Vijaya
Copyright Year	2014
Abstract	Samples of ZnO–Al2O3 and ZnO–Fe2O3 with different loadings of ZnO (5–20 wt%) were prepared by impregnation of the supports (γ-Al2O3 and α-Fe2O3) with ZnNO3 and calcination at 873 K. XRD studies of the calcined samples revealed that the ZnO had reacted with the support to form the corresponding spinels, ZnAl2O4 and ZnFe2O4. The catalytic activity of the supported spinel samples, and samples of stoichiometric ZnAl2O4 and ZnFe2O4 prepared by co-precipitation were examined for the transesterification of sunflower oil, waste cooking oil and Jatropha oil. Linear relationships between the spinel content, estimated by XRD, and surface Zn concentration estimated by XPS and transesterification activity of the samples were obtained. XVB (X-ray valence band) studies provided evidence to suggest that the Zn 3d electrons may have played a major part in the electronic excitation of the spinels (ZnAl2O4 and ZnFe2O4) and, therefore, their catalytic activity.
Starting Page	851
Ending Page	860
Page Count	10
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	4
Issue Number	3
Journal	Catalysis Science & Technology
DOI	10.1039/c3cy00857f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	X-ray crystallography Stoichiometry Spinel Valence and conduction bands Calcination Transesterification Coprecipitation Jatropha curcas
Content Type	Text
Resource Type	Article
Subject	Catalysis

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