Synthesis, structure and three way catalytic activity of Ce1-xPtx/2Rhx/2O2-δ (x = 0.01 and 0.02) nano-crystallites: synergistic effect in bimetal ionic catalysts

Gayen, Arup ; Baidya, Tinku ; Biswas, Krishanu ; Roy, Sounak ; Hegde, M. S. (2006) Synthesis, structure and three way catalytic activity of Ce1-xPtx/2Rhx/2O2-δ (x = 0.01 and 0.02) nano-crystallites: synergistic effect in bimetal ionic catalysts Applied Catalysis A: General, 315 . pp. 135-146. ISSN 0926-860X

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S09268...

Related URL: http://dx.doi.org/10.1016/j.apcata.2006.09.015

Abstract

Bimetal ionic Ce1-xPtx/2Rhx/2O2-δ (x = 0.01 and 0.02) catalysts have been synthesized by a single step solution combustion method. CO and C2H4 oxidation and NO reduction activities of the bimetal ionic catalysts are compared with mono-metal ionic Ce1-xPtxO2-δ (x = 0.01 and 0.02) and Ce1-xRhxO2-δ (x = 0.01 and 0.02) catalysts. X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) studies show incorporation of Pt2+ and Rh3+ ions in CeO2 lattice. Low temperature hydrogen uptake at 0 °C and below over bimetal ionic catalyst shows enhanced redox property over the corresponding mono-metal ionic analogues. The TOF for CO oxidation over Ce0.99Pt0.005Rh0.005O2-δ is 0.035 s-1 at 120 °C, compared to 0.003 s-1 over Ce0.99Pt0.01O2-δ and 0.035 s-1 over Ce0.99Rh0.01O2-δ at 135 °C. Enhanced catalytic activity of Ce1-xPtx/2Rhx/2O2-δ (x = 0.01) bimetal ionic catalysts compared to mono-metal ionic catalysts, Ce1-xPtxO2-δ and Ce1-xRhxO2-δ, is attributed to synergism brought about by the easy reduction of Rh3+ ion by Pt2+ ion.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Pt-Rh Synergism; Bimetal Ionic Catalysts; Ceria; Ionic Dispersion
ID Code:15889
Deposited On:13 Nov 2010 12:31
Last Modified:03 Jun 2011 07:23

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