In Situ Hydrogen Peroxide Production for Selective Oxidation of Benzyl Alcohol over a Pd@Hierarchical Titanium Silicalite Catalyst

ACS Omega
Jinghui LyuXiaonian Li

Abstract

Using in situ generated H2O2 is potentially an effective approach for benzyl alcohol selective oxidation. While the microporous titanium silicate (TS-1) supported with Pd is promising for selective oxidation, the Pd particles are preferentially anchored on the external surface, which leads to the problems such as non-uniform dispersion and low thermal stability. Here, we prepared a Pd@HTS-1 catalyst in which the Pd subnanoparticles were encapsulated in the channels of the hierarchical TS-1 (HTS-1), for benzyl alcohol selective oxidation with in situ produced H2O2. We find that the oxidation rate of benzyl alcohol by in situ H2O2 over the Pd@HTS-1 is up to 4268.8 mmol h-1 kgcat-1, and the selectivity of benzaldehyde approaches 100%. In contrast to the conventional Pd/HTS-1, the present Pd@HTS-1 benefits the benzyl alcohol selective oxidation due to the increased dispersion of Pd particles (forming uniformly dispersed subnano-sized particles), as well as the confinement effect and hierarchical porosity of the HTS-1 host. We further suggested that hydrogen peroxide produced in situ from the molecular hydrogen and oxygen over the Pd sites can be spilled over to the framework Ti4+ sites, forming the Ti-OOH active species, which sele...Continue Reading

References

Aug 1, 2002·Journal of the American Chemical Society·Wenyong Lin, Heinz Frei
Jun 12, 2010·Journal of the American Chemical Society·Minkee ChoiEnrique Iglesia
Nov 26, 2015·Journal of the American Chemical Society·Neil M Wilson, David W Flaherty
Feb 27, 2016·Science·Simon J FreakleyGraham J Hutchings
Oct 11, 2016·Chemical Society Reviews·Qiang Fu, Xinhe Bao
Nov 5, 2016·ChemSusChem·Rosaria CiriminnaMario Pagliaro

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Citations

Oct 2, 2021·Chemistry : a European Journal·Sharif NajafishirtariMalte Behrens

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Methods Mentioned

BETA
X-ray
thermal treatments

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