화학공학소재연구정보센터
Journal of Molecular Catalysis A-Chemical, Vol.228, No.1-2, 319-324, 2005
Gallia as support of Pt in benzene hydrogenation reaction
Catalysts of 0.5 wt.% platinum supported on gallia/alumina containing 0, 1, 10 and 100 wt.% of gallia were prepared to study the effects of gallia as a support for the benzene hydrogenation reaction. The catalysts were prepared by the incipient wetness impregnation method with aqueous solutions of H2PtCl6 and Ga(NO3)(3) as platinum and gallia precursors. gamma-Al2O3 and beta-Ga2O3 were used as supports. The following techniques were used to characterize the catalysts: X-ray diffraction, nitrogen adsorption for surface area determination. temperature-programmed reduction. carbon monoxide chemisorption and thermal gravimetric analysis. The benzene hydrogenation was used to test the catalytic activity. The 0.5% Pt/Al2O3 catalyst showed the highest activity. It was observed that the surface area, the dispersion and the activity decreased when the gallia content was increased. The addition of gallia to the alumina did not provide enough acidity to generate isomerization products. since the only reaction product was cyclohexane. (C) 2004 Elsevier B.V. All rights reserved.