Hydrogenation of 2-ethyl-hexen-2-al on Ni/Al2O3 catalysts

• Autor(a) principal: Mattos,Arthur R.J.M.
• Data de Publicação: 2004
• Outros Autores: Probst,Sônia H., Afonso,Júlio C., Schmal,Martin
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Journal of the Brazilian Chemical Society (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532004000500024
• topic: 2-ethyl-hexen-2-al; 2-ethyl-hexanal; Ni/Al2O3, slurry bed reactor

This work describes the hydrogenation of 2-ethyl-hexen-2-al in a slurry bed reactor in liquid phase on Ni/Al2O3 catalysts (4.4-17.0% wt Ni). XRD, DRS and TPR results showed the presence of superficial Ni2+ species in octahedral (surface Ni oxide) and tetrahedral coordination (spinel-type phase) in the subsurface of the support. Nickel oxide crystallites were found in samples with Ni content above 7.3%, either in tetrahedral or octahedral coordination. The highest selectivity for 2-ethyl-hexanal was obtained with the catalysts containing 7.3% wt Ni. The turnover frequency (TOF) was independent on the Ni concentration, suggesting that this hydrogenation reaction is structure insensitive.