Hidrogenação seletiva do aldeido cinamico a alcool cinamico sobre catalizadores de Pt suportados em carvão ativo e oxido de titanio

AUTOR(ES)
DATA DE PUBLICAÇÃO

1995

RESUMO

The selective hydrogenation of cinnamaldehyde to cinnamic alcohol in the liquid phase was investigated over a series of catalysts based on platinum, supported on activate carbon and titanium dioxide, promoted with Fe and Sn. The catalysts with the following composition: 5% Pt, 4.7% Pt - 0.3% Fe and 4.16% Pt-0.84% Sn were prepared by co-impregnation. The catalysts supported on activated carbon were reduced at 430°C, while the ones supported on titanium dioxide were pre-reduced at different temperatures based on TPR (Temperature Programmed Reduction) experiments. The activation of the catalysts was done "in situ" over 2 hours under reaction conditions. The characterization of the catalysts was done by TPR, Electronic Scanning Microscopy, X-Ray Diffraction and Surface Area (BET). Catalytic tests of the reaction of hydrogenation of cinnamaldehyde in the liquid phase were conducted under 60°C, hydrogen pressure of 4 MPa, using isopropanol and sodium acetate 0.1 N solution as a solvent. The results of the catalytic test showed that the use of titanium dioxide as a support increased significantly the selectivity of cinnamyl alcohol compared to the same catalysts supported on carbono The addition of Fe increased significantly the activity of the hydrogenation of cinnamaldehyde

ASSUNTO(S)

hidrogenação aldeidos catalise heterogenea

ACESSO AO ARTIGO

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