Data di Pubblicazione:
1996
Citazione:
Hydrogenation of (a,b-unsaturated aldehydes over Ru/Al2O3 catalysts / L., Mercadante; G., Neri; C., Milone; A., Donato; S., Galvagno; Donato, Andrea. - In: JOURNAL OF MOLECULAR CATALYSIS. A: CHEMICAL. - ISSN 1381-1169. - 105:(1996), pp. 93-101.
Abstract:
The hydrogenation of citral and cinnamaldehyde has been investigated over Ru/Al2O3 catalysts. The effect of metal partick
size on the catalytic activity and selectivity has been studied by using catalysts having a metal dispersion ranging from 0.05 to
0.88. It has been observed that the overall rate of hydrogenation of both the unsaturated aldehydes is not influenced by the Ru
particle size. In the hydrogenation of cinnamaldehyde a higher selectivity to cinnamyl alcohol has been observed on catalysts
with larger metal particle size. No variations have been found in the hydrogenation of citral. It is suggested that steric effects do
not influence significantly the product selectivity. A repulsive interaction between the aromatic ring and the catalyst surface
would explain the higher selectivity to cinnamyl alcohol. On ail the investigated catalysts the isolated C=C double bond of citral
shows a low reactivity. It is suggested th;rt the unsaturated aldehyde is adsorbed through the carbonyl group. This strong
adsorption prevents !he hvdlogenatioa of the kllated oleEnic bond which is located far away fron, the adsorption centers.
size on the catalytic activity and selectivity has been studied by using catalysts having a metal dispersion ranging from 0.05 to
0.88. It has been observed that the overall rate of hydrogenation of both the unsaturated aldehydes is not influenced by the Ru
particle size. In the hydrogenation of cinnamaldehyde a higher selectivity to cinnamyl alcohol has been observed on catalysts
with larger metal particle size. No variations have been found in the hydrogenation of citral. It is suggested that steric effects do
not influence significantly the product selectivity. A repulsive interaction between the aromatic ring and the catalyst surface
would explain the higher selectivity to cinnamyl alcohol. On ail the investigated catalysts the isolated C=C double bond of citral
shows a low reactivity. It is suggested th;rt the unsaturated aldehyde is adsorbed through the carbonyl group. This strong
adsorption prevents !he hvdlogenatioa of the kllated oleEnic bond which is located far away fron, the adsorption centers.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
Hydrogenation,; Unsaturated aldehydes,; Rutheniurn,; Particle size effect
Elenco autori:
L., Mercadante; G., Neri; C., Milone; A., Donato; S., Galvagno; Donato, Andrea
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