Chemoselective hydrogenation of cinnamaldehyde over a Pt-Lewis acid collaborative catalyst under ambient conditions
Industrial and Engineering Chemistry Research, ISSN: 1520-5045, Vol: 54, Issue: 5, Page: 1487-1497
2015
- 69Citations
- 45Captures
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Article Description
A novel Pt-Lewis acid collaborative catalyst system for selective hydrogenation of cinnamaldehyde is developed. The Pt/MIL-101 catalyst is able to efficiently catalyze the selective hydrogenation of the C=C group in cinnamaldehyde to hydrocinnamaldehyde at atmospheric pressure and room temperature with >99.9% selectivity at conversions >99.9%. The remarkably enhanced catalytic activity and selectivity of Pt/MIL-101 can be attributed to the synergism effect between highly dispersed Pt and Lewis acid sites. In situ ATR-IR spectroscopic studies and reaction results demonstrated that the Lewis acid sites on MIL-101 suppressed the reactivity of the C=O bond in cinnamaldehyde while enhancing the hydrogenation activity of the conjugated C=C bond through a strong interaction with the C=O bond, which subsequently inhibited the consecutive hydrogenation of the produced hydrocinnamaldehyde. The kinetic parameters of cinnamaldehyde hydrogenation over the Pt/MIL-101 catalyst were investigated, and a kinetic model was established based on the reaction mechanism and compared with experimental observations.
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