Gas-phase hydrogenation of benzene to cyclohexane over combustion-synthesized Ce1-xPtxO2-delta (x = 0.01, 0.02)

Nagaveni, K and Sivalingam, G and Gayen, A and Madras, G and Hegde, MS (2003) Gas-phase hydrogenation of benzene to cyclohexane over combustion-synthesized Ce1-xPtxO2-delta (x = 0.01, 0.02). In: Catalysis Letters, 88 (1-2). pp. 73-81.

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Abstract

The gas-phase hydrogenation of benzene to cyclohexane over, Ce1-xPtxO2-delta (x = 0.01, 0.02) catalyst was investigated in the temperature range 80-200degreesC. A 42% conversion of benzene to cyclohexane with 100% specificity was observed at 100degreesC over Ce0.98Pt0.02O2-delta with a catalyst residence time of 1.22 x 10(4) g s/mol of benzene. The activity of the catalyst was compared with those of Pt metal, combustion-synthesized Pt/gamma-Al2O3 and Pt/gamma Al2O3. The turnover frequency value of Ce0.98Pt0.02O2-delta is 0.292, which is an order of magnitude higher than those of the other Pt catalysts investigated. The kinetics of reaction and the deactivation behavior of the catalyst were studied and a regeneration methodology was suggested. The deactivation kinetics and structural evidence from XRD, XPS, TGA and H-2 uptake studies suggest that the oxidized Pt in Ce0.98Pt0.02O2-delta is responsible for the high catalytic activity towards benzene hydrogenation.

Item Type:	Journal Article
Publication:	Catalysis Letters
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Keywords:	benzene hydrogenation;combustion synthesis;Ce1-xPtxO2-delta hydrogen uptake;catalyst deactivation.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	22 Jul 2009 11:41
Last Modified:	19 Sep 2010 04:54
URI:	http://eprints.iisc.ac.in/id/eprint/17024

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