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Issue 3, 2009
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Noble metal ionic catalysts: correlation of increase in CO oxidation activity with increasing effective charge on Pd ion in Pd ion substituted Ce1−xMxO2−δ (M = Ti, Zr and Hf)

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Abstract

Pd ion substituted Ce1−xMxO2−δ (M = Ti, Zr, Hf) have been prepared by a single step solution combustion method. Two atom% Pd ion substitution in the title compounds is confirmed by X-ray diffraction (XRD) and Pd ion charge state and redox properties have been determined by X-ray photoelectron spectroscopy (XPS) and H2/TPR studies. While Pd ion in CeO2 (Ce0.98Pd0.02O2−δ) showed higher catalytic activity for CO oxidation than Pd metal impregnated over CeO2, further increase in the catalytic activity is observed with Pd ion in Ce1−xTi(Hf)xO2 and a decrease in the activity with Pd ion in Ce1−xZrxO2. Effective charge on Pd ion could be varied by its substitution in these solid solutions Ce1−xMxO2 (M = Ti, Zr & Hf) and also in TiO2 compared to Pd ion in PdO. Effective positive charge on Pd ion is determined from the core level binding energy shift of Pd(3d5/2) peak with respect to Pd metal. Rate of CO oxidation increased and activation energy decreased with increase in effective charge on the Pd ion in the Pd ion substituted fluorites.

Graphical abstract: Noble metal ionic catalysts: correlation of increase in CO oxidation activity with increasing effective charge on Pd ion in Pd ion substituted Ce1−xMxO2−δ (M = Ti, Zr and Hf)

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Publication details

The article was received on 26 Aug 2008, accepted on 30 Sep 2008 and first published on 11 Nov 2008


Article type: Paper
DOI: 10.1039/B814742F
Citation: Dalton Trans., 2009,0, 455-464

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    Noble metal ionic catalysts: correlation of increase in CO oxidation activity with increasing effective charge on Pd ion in Pd ion substituted Ce1−xMxO2−δ (M = Ti, Zr and Hf)

    T. Baidya, G. Dutta, M. S. Hegde and U. V. Waghmare, Dalton Trans., 2009, 0, 455
    DOI: 10.1039/B814742F

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