Abstract
Deactivation of Au–Pd/TiO2 catalyst during oxidation in flow is attributed to Pd leaching and a complex effect of oxygen.
Highlights
The stability of a bimetallic Au–Pd/TiO2 catalyst was examined in a packed bed microreactor for the oxidation of cinnamyl alcohol dissolved in toluene
It has been indicated that benzaldehyde can be formed by both the oxidation and disproportionation of benzyl alcohol, while toluene is produced only from the disproportionation.[32]
When it was changed back to cinnamyl alcohol oxidation, the trend of catalyst deactivation continued. This suggests that the catalyst deactivation in cinnamyl alcohol oxidation due to metal leaching and presence of oxygen does not apply to benzyl alcohol oxidation, and this may be due to the different catalytic sites for the two reactants, different reaction mechanism as well as the different products
Summary
Active hydroxyl and alkenyl functional groups in cinnamyl alcohol, complex reaction pathways are possible in this reaction (Fig. 1).[17,18,19,20] Apart from cinnamaldehyde arising from dehydrogenation of cinnamyl alcohol, 3-phenyl-1-propanol and trans-β-methylstyrene can be produced through hydrogenation and hydrogenolysis reactions, respectively. These three products could potentially further lead to 1-phenylpropane, styrene, 3-phenyl-1-propanal, ethylbenzene and benzaldehyde. Various reaction conditions are investigated, in an attempt to explore the possible contributions to catalyst deactivation
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