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Abstract
In this study, a high catalytic activity of palladium nanoparticles immobilized on alumina (Al2O3) is reported for the industrially important reduction of aromatic nitro compounds to amino compounds. The palladium nanoparticles were immobilized on alumina by a simple physical precipitation method. The synthesis of palladium nanoparticles was done in ethylene glycol without using any external stabilizing agent. The composite particles exhibited good colloidal stability. The catalytic activity is investigated qualitatively by high performance liquid chromatography (HPLC) and quantitatively by photometrically monitoring the reduction of p-nitrophenol by an excess of sodium borohydride (NaBH4) in the presence of nanocomposites. The kinetic data could be explained by the assumption of pseudo first-order reaction with respect to p-nitrophenol.
complex. Though palladium, platinum, rhodium and ruthenium complexes have been anchored to a variety of supports, palladium complexes find an important place in the hydrogenation of nitro compounds under mild conditions [ 7 – 10 ]. In our earlier study, we
instability of dinitro and higher polynitroaromatic compounds advise the use of a liquid-phase reaction [ 1 ]. The selective hydrogenation of nitro-compounds is commonly used to manufacture amines, which are important intermediates for dyes, urethanes
Introduction The hydrogenation of nitro compounds is an interesting industrial process for the manufacture of a great variety of oximes, amines and amides. Of these, cyclohexane oxime and ∊-caprolactam are important
), as has been noted for the hydrogenation of aliphatic [ 15 ] and aromatic [ 16 ] nitro-compounds in both gas [ 17 , 18 ] and liquid [ 19 , 20 ] phase operation. We have previously demonstrated exclusive –NO 2 group reduction in gas phase
reaction mixture, imparts high product selectivity and reusability. Nitration of aromatics is one of the most important chemical reactions in organic chemistry because it constitutes a convenient way of synthesizing nitro compounds that lead to a
