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Issue 24, 2017
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Efficient Pt–FeOx/TiO2@SBA-15 catalysts for selective hydrogenation of cinnamaldehyde to cinnamyl alcohol

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Abstract

TiO2 was coated onto mesoporous silica SBA-15 by hydrolysis of tetrabutyl titanate to prepare 15 wt% TiO2@SBA-15 composites (15TS). The 15TS composites retain the mesostructure 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 the Pt catalyst supported on pristine SBA-15, the Pt/15TS catalyst afforded higher activity and selectivity to COL. Furthermore, the modification of the Pt/15TS catalyst by FeOx can greatly improve the activity and 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 the 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 a selectivity to COL of 86.4% over the Pt–FeOx/15TS-773 catalyst. Moreover, the Pt–FeOx/15TS-773 catalyst can also be reused 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[double bond, length as m-dash]O bonds in CAL.

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

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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., 2017,7, 6112-6123
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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, 7, 6112
    DOI: 10.1039/C7CY02008B

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