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Selective hydrogenation of citral over supported Pt catalysts: insight into support effects

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Abstract

Highly dispersed platinum (Pt) nanoparticles (NPs) were deposited on various substrates by atomic layer deposition (ALD) in a fluidized bed reactor at 300 °C. The substrates included multi-walled carbon nanotubes (MWCNTs), silica gel (SiO2), commercial γ-Al2O3, and ALD-prepared porous Al2O3 particles (ALD-Al2O3). The results of TEM analysis showed that ~1.3 nm Pt NPs were highly dispersed on all different supports. All catalysts were used for the reaction of selective hydrogenation of citral to unsaturated alcohols (UA), geraniol, and nerol. Both the structure and acidity of supports affected the activity and selectivity of Pt catalysts. Pt/SiO2 showed the highest activity due to the strong acidity of SiO2 and the conversion of citral reached 82% after 12 h with a selectivity of 58% of UA. Pt/MWCNTs showed the highest selectivity of UA, which reached 65% with a conversion of 38% due to its unique structure and electronic effect. The cycling experiments indicated that Pt/MWCNTs and Pt/ALD-Al2O3 catalysts were more stable than Pt/SiO2, as a result of the different interactions between the Pt NPs and the supports.

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Acknowledgments

Acknowledgment is made to the donors of the American Chemical Society Petroleum Research Fund for partial support of this research. The authors also thank Jessica TerBush at the Materials Research Center at Missouri University of Science and Technology for TEM analysis.

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Authors and Affiliations

  1. Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, Rolla, MO, 65409, USA

    Xiaofeng Wang & Xinhua Liang

  2. Department of Civil and Environmental Engineering, University of Missouri, Columbia, MO, 65211, USA

    Weiming Hu & Baolin Deng

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  1. Xiaofeng Wang
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  2. Weiming Hu
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  3. Baolin Deng
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  4. Xinhua Liang
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Correspondence to Xinhua Liang.

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Wang, X., Hu, W., Deng, B. et al. Selective hydrogenation of citral over supported Pt catalysts: insight into support effects. J Nanopart Res 19, 153 (2017). https://doi.org/10.1007/s11051-017-3845-3

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  • DOI: https://doi.org/10.1007/s11051-017-3845-3

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