NDLI: Nanostructured iron oxide catalysts with gold for the oxidation of carbon monoxide

Content Provider	Royal Society of Chemistry (RSC)
Author	Figueiredo, José L. Tavares, Pedro B. Carabineiro, Sónia A. C. Bogdanchikova, Nina
Copyright Year	2012
Abstract	A commercial iron oxide support is compared with Fe2O3 samples prepared by decomposition of iron nitrate, at 300 °C and 500 °C and heating times varying from 30 min to 96 h in N2. Different methods were used for gold deposition, namely double impregnation (DIM), liquid phase reductive deposition (LPRD) and ultrasonication (US). Samples were characterised by N2 adsorption at −196 °C, high-resolution transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and temperature programmed reduction. CO oxidation was used as a test reaction to compare the catalytic activities. The best results were obtained for the sample produced by decomposition of nitrate at 300 °C for 1 h, which showed the largest surface area and highest amount of hydroxylated iron species. Increasing the calcination time and/or the temperature produced less active samples. Although LPRD materials showed the smallest gold nanoparticle sizes (1–12 nm), the best catalytic results were obtained for the DIM materials. This is most likely related to the oxidation state of gold (Au+) found in the DIM catalysts, in contrast with LPRD and US materials, where metallic gold (Au0) is present. Other samples showed lower activities. Nevertheless, all samples prepared by DIM had better catalytic activity than the Au/Fe2O3 World Gold Council reference catalyst.
Starting Page	2957
Ending Page	2965
Page Count	9
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	2
Issue Number	7
Journal	RSC Advances
DOI	10.1039/c2ra00724j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Fe2O3 World Gold Council Iron oxide Nanoparticle High-resolution transmission electron microscopy Calcination Photoemission spectroscopy X-ray crystallography World Gold Council Iron(III) nitrate Nitrate Adsorption X-ray photoelectron spectroscopy
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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