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Phenol Hydrogenation to Cyclohexanol Catalysed by Palladium Supported on CuO/CeO2
Von Wiley-VCH zur Verfügung gestellt
Selective hydrogenation of phenol to cyclohexanol, an industrially important reaction over Pd-CuO/CeO2 showed very high efficiency under mild conditions. Palladium loading on CuO/CeO2 led to hydrogen spillover on the catalyst surface increasing the oxygen vacancies helping activation of phenol as phenoxide ion with perpendicular orientation of aromatic ring on catalyst surface as evident from FTIR studies.
Hydrogenation of phenol to cyclohexanone/cyclohexanol is an important reaction in production of nylon-6, nylon-66 and in petroleum industry. Liquid phase phenol hydrogenation over Pd-CuO/CeO2 was carried out under mild conditions. Palladium impregnated over CuO/CeO2 synthesized by co-precipitation method showed excellent catalytic activity for phenol hydrogenation (99% conversion with 80% cyclohexanol yield) at 90 °C and 10 bar H2 pressure in water. Commercial 10%Pd/C showed only 8% phenol conversion under identical conditions. The detailed characterization revealed significant improvement in surface area of ceria after addition of CuO and decrease in crystallite size with creation of defects in CeO2 lattice. XPS analysis showed Pd loading on CuO/CeO2 to cause hydrogen spillover on the surface leading to increase in the oxygen vacancies. The interaction of phenol with catalyst surface studied by detailed FTIR analysis, revealed activation of phenol on oxygen vacancy of ceria as phenoxide ion with perpendicular orientation of aromatic ring on catalyst surface.Zum Volltext
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