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Efficient Pt-FeOx/TiO2@SBA-15 catalysts for selective hydrogenation of cinnamaldehyde to cinnamyl alcohol

Abstract

TiO2 was coated to mesoporous silica SBA-15 by hydrolysis of the tetrabutyl titannate to prepare 15 wt.% TiO2@SBA-15 composites (15TS). The 15TS composites retain the meso-structure of the SBA-15 host, and TiO2 was highly dispersed and uniformly coated. 5 wt.% Pt nanoparticles supported on 15TS were employed for liquid-phase selective hydrogenation of cinnamaldehyde (CAL) to cinnamyl alcohol (COL). Compared with Pt catalyst supported on pristine SBA-15, the Pt/15TS catalyst afforded higher activity and selectivity to COL. Furthermore, modification of Pt/15TS catalyst by FeOx can greatly improve the activity as well as the selectivity to COL. As a result, the Pt-FeOx/15TS catalyst displayed excellent selectivity to COL (around 84.5%) at nearly complete CAL conversion. Of particular note is that further calcination of Pt-FeOx/15TS catalyst precursor in air at 773 K before reduction would greatly enhance the catalytic performance. Consequently, the TOF reached 3.06 s-1 with the selectivity to COL of 86.4% over the Pt-FeOx/15TS-773 catalyst. Moreover, the Pt-FeOx/15TS-773 catalyst can also be reused for about eight times without distinct loss in activity or selectivity. Based on characterization by XPS and H2-TPR, the important promotion effect of FeOx and strong metal-support interaction played key roles in preferential adsorption and activation of C=O bond in CAL.

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Publication details

The article was received on 30 Sep 2017, accepted on 13 Nov 2017 and first published on 13 Nov 2017


Article type: Paper
DOI: 10.1039/C7CY02008B
Citation: Catal. Sci. Technol., 2017, Accepted Manuscript
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    Efficient Pt-FeOx/TiO2@SBA-15 catalysts for selective hydrogenation of cinnamaldehyde to cinnamyl alcohol

    Y. Xue, R. Yao, J. Li, G. Wang, P. WU and X. Li, Catal. Sci. Technol., 2017, Accepted Manuscript , DOI: 10.1039/C7CY02008B

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