Baidya, Tinku and Dutta, Gargi and Hegde, MS and Waghmare, Umesh V (2009) Noble metal ionic catalysts: correlation of increase in CO oxidation activity with increasing effective charge on Pd ion in Pd ion substituted Ce1-xMxO2-delta (M = Ti, Zr and Hf). In: Dalton Transactions (3). pp. 455-464.
![[img]](http://eprints.iisc.ac.in/style/images/fileicons/application_pdf.png) |
PDF
full.pdf - Published Version Restricted to Registered users only Download (427kB) | Request a copy |
Abstract
Pd ion substituted Ce1-xMxO2- (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-) 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.
| Item Type: | Journal Article |
|---|---|
| Publication: | Dalton Transactions |
| Publisher: | Royal Society of Chemistry |
| Additional Information: | Copyright of this article belongs to Royal Society of Chemistry. |
| Department/Centre: | Division of Chemical Sciences > Solid State & Structural Chemistry Unit |
| Date Deposited: | 03 Nov 2009 09:55 |
| Last Modified: | 19 Sep 2010 05:00 |
| URI: | http://eprints.iisc.ac.in/id/eprint/18182 |
Actions (login required)
 |
View Item |
