Hydrogenation of cinnamaldehyde over Pt/ZrO₂ catalyst modified by Cr, Mn, Fe, Co, Ni and Sn

Abstract

Hydrogenation of cinnamaldehyde (CMA) has been studied over Pt/ZrO₂ and PtM/ZrO₂ calalysts (M= Cr, Mn, Fe, Cu, Ni, Sn) in ethanol at 343 K and 2.0 MPa. The catalytic properties are shown to increase upon introduction of metals to Pt/ZrO₂ catalyst.

Catalytic activities of the catalysts are enhanced except PtCr/ZrO₂ catalyst. PtMn/ZrO₂ PtCo/ZrO₂, and PtFe/ZrO₂ catalysts show good yield of cinnamyl alcohol (CMO), and Pt Ni/ZrO₂ PtSn/ZrO₂ catalysts show good yield of hydrocinnamaldehyde (HCM A). In the presence of NaOH and H₂O, rate of the hydrogenation of CMA increases significantly and side reaction is remarkably inhibited. PtCo/ZrO₂catalyst shows best catalytic activity (TOF 7.4×10^-2 s^-1) and yield of CMO (84.1mol %). PtNi/ZrO₂ catalyst shows best yield of HCMA (62.8 mol %). More active sites for the hydrogenation or C=O group on PtCo/ZrO₂cata1yst surface are the main reason of good selectivity of CMO.