Influence of rare earths on activity and selectivity of hydrogenation of chloronitrobenzene over PtM/C (M=La, Ce, Pr, Nd and Sm) catalysts

Abstract

Hydrogenation of chloronitrobenzene has been studied over Pt/C and PtM/C catalysts (M= Sm, Pr, Ce, Nd and La) in ethanol at 303 K and normal pressure. The effect of substrate concentration and reaction temperature has also been investigated over PtCe/C catalyst. The hydrogenation has been carried out over Pt/C catalyst. The order of the hydrogenation of choloronitrobenzene is p>o>m, and that of the yield of chloroaniline is: p>o>m. The conversion of chloronitrobenzene is >99% and chloroaniline is the main product on hydrogenation over PtM/C catalysts. PtCe/C catalyst exhibits the best catalytic activity (TOF = 0.47 s⁻¹) and the highest yield of p-CAN (96.6 mol%). PtLa/C catalyst gives the best yield for m-chloroaniline (95.8 mol%) and o-chloroaniline (96.5 mol%). PtCe/C (0.1 wt%) catalyst exhibits good catalytic activity and stability on the hydrogenation of p-chloronitrobenzene.