Hydrogenation of Aromatic Nitrocompounds on Supported

Mono- and Bimetallic Catalysts

A.T.Massenova and L.R.Sassykova

D.V.Sokolsky Institute of Organic Catalysis and Electrochemistry, 142 Kunaev St., 480100 Almaty, Kazakhstan

Abstract

Catalytic hydrogenation of substituted aromatic nitrocompounds and hydrocarbons has been studied. It

was established that monometallic Pd-catalysts were suitable for reduction of nitrogroups. Bifunctional

catalysts such as Rh-Pt, Rh-Pd, Pd-Ru and Rh-Ru were used for hydrogenation of both aromatic ring and nitrogroup and sequence of their hydrogenation depended on support nature. Over Rh-Pt alumina supported catalysts consequent hydrogenation of NO2 and benzene ring took place, over silica supported catalysts their consecutive hydrogenation was observed. Such catalytic properties of bimetallic Rh-Pt and Rh-Pd catalysts probably connected with metal-metal interaction leading to optimal adsorption strength of uniformly adsorbed hydrogen. The optimal reaction conditions (temperature and hydrogen pressure) have been elaborated for synthesis of alicyclic amines with 95-99% yields.