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2910046 
Journal Article 
Gas-phase hydrogenation of benzene to cyclohexane over combustion-synthesized Ce1-xPtxO2-delta (x = 0.01, 0.02) 
Nagaveni, K; Sivalingam, G; Gayen, A; Madras, G; Hegde, MS 
2003 
Yes 
Catalysis Letters
ISSN: 1011-372X
EISSN: 1572-879X 
88 
1-2 
73-81 
English 
WOS:000182580300012 
The gas-phase hydrogenation of benzene to cyclohexane over Ce 1-xPtxO2-δ (x = 0.01, 0.02) catalyst was investigated in the temperature range 80-200 °C. A 42% conversion of benzene to cyclohexane with 100% specificity was observed at 100 °C over Ce0.98Pt0.02O2-δ with a catalyst residence time of 1.22 × 104 gs/mol of benzene. The activity of the catalyst was compared with those of Pt metal, combustion-synthesized Pt/α-Al2O3 and Pt/γ-Al2O 3. The turnover frequency value of Ce0.98Pt 0.02O2-δ 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 H2 uptake studies suggest that the oxidized Pt in Ce0.98Pt0.02O2-δ is responsible for the high catalytic activity towards benzene hydrogenation. 
benzene hydrogenation; combustion synthesis; Ce1-xPtxO2-delta hydrogen uptake; catalyst deactivation