Abstract
Selective hydrogenation of chloronitrobenzene to the corresponding chloroaniline has been studied in ethanol at 303 K and normal pressure over Pt/TiO 2 catalyst modified by transition metal (Cr, Mn, Fe, Co, Ni and Cu). The influence of transition metal (Cr, Mn, Fe, Co, Ni and Cu) on the hydrogenation properties of chloronitrobenzene (CNB) over Pt/TiO 2 catalyst has been studied in ethanol at 303 K and normal pressure. The hydrogenation of CNB can be carried out over Pt/TiO 2 catalyst. The order of the hydrogenation rate of CNB is m > p > o , and the yield of chloroaniline (CAN) is p > m > o . The effect of transition metal may be interpreted by electronic effect. Electron deficient species of the second element promote the specific rate constant turnover frequency (TOF) expressed on a per surface Pt atom by activating the nitrogen–oxygen bond. The conversion of CNB is over 99% and chloroaniline is main product on the hydrogenation of CNB over PtM/TiO 2 catalysts. PtFe/TiO 2 catalyst shows the best selectivity of CNB to CAN, and 98.0 mol% for p -CAN, 98.5 mol% for m -CAN and 98.7 mol% for o -CAN, respectively. Both catalytic activity and yield of p -CAN increase with addition of Fe over Pt/TiO 2 on the hydrogenation of p -CNB.
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