The use of isotopic oxygen exchange to investigate carbon monoxide oxidation over supported gold catalysts

Duggan, M.J., 2003. The use of isotopic oxygen exchange to investigate carbon monoxide oxidation over supported gold catalysts. PhD, Nottingham Trent University.

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Until recently, gold was viewed as catalytically inert, due in large part to the noble character of bulk gold. However, when gold is finely dispersed on a suitable support, the material is often endowed with high catalytic ability for a number of reactions, most notably, CO oxidation at ambient conditions.

In this thesis, isotopic oxygen exchange is used to probe the reactivity of surface oxygen, with a view to correlate these results with the CO oxidation results and better understand the surface processes governing CO oxidation. In this study, both MgO and Fe2O3 have been chosen as supports for gold. The first one is known to exchange oxygen well and Fe2O3 as a support is associated with high activity for CO oxidation at room temperature. Both sets of catalysts have been prepared by either co-precipitation or impregnation and pre-treated by calcining in air at 435°C, 800°C or left uncalcined, in addition they have both been tested for their ability to exchange oxygen and oxidize CO.

Results suggest a strong influence of preparation technique and support type on isotopic oxygen exchange and CO oxidation. Comparison of exchange and oxidation data suggest oxidation occurs by a non-lattice pathway. Several experiments indicate this is augmented by oxidation from the lattice in some cases.

All samples have been characterised by a range of techniques aimed at elucidating the nature of their surfaces, with the aim of correlating these data with sample isotopic exchange and CO oxidation performance. These techniques include; BET surface area determination, XPS, TPR, SEM and XRD.

Item Type: Thesis
Creators: Duggan, M.J.
Date: 2003
ISBN: 9781369314823
Divisions: Schools > School of Science and Technology
Record created by: Jill Tomkinson
Date Added: 30 Sep 2020 13:22
Last Modified: 03 Aug 2023 10:59

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