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High-Loading Pt Single-Atom Catalyst on CeO2 -Modified Diatomite Support.

Yang Zhou1, Wei Xi2, Zixin Xie1

  • 1School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China.

Chemistry, an Asian Journal
|August 17, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel method to create high-loading single-atom catalysts on silica supports. Modifying diatomite with cerium oxide nanoparticles enhanced catalytic performance for selective hydrogenation reactions.

Keywords:
diatomiteheterogeneous catalysissingle-atom catalyst

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Area of Science:

  • Heterogeneous catalysis
  • Materials science
  • Nanotechnology

Background:

  • Single-atom catalysis is a growing field in heterogeneous catalysis.
  • Silica (SiO2)-based materials are abundant but challenging supports for high-loading single-atom catalysts due to limited anchoring sites.
  • Fabricating stable single-atom catalysts on silica supports with high metal loading remains a significant challenge.

Purpose of the Study:

  • To develop a method for increasing defect sites on silica supports to improve metal anchoring.
  • To achieve high loading of single-atom catalysts on modified silica supports.
  • To evaluate the performance of the developed catalyst in selective hydrogenation reactions.

Main Methods:

  • Modification of diatomite (a pure SiO2 mineral) with cerium oxide (CeO2) nanoparticles.
  • Characterization of the modified support to confirm increased defect sites.
  • Impregnation of platinum (Pt) species onto the modified support to achieve high loading.
  • Testing the catalytic activity of the Pt single-atom catalyst in the selective hydrogenation of phenylacetylene to styrene.

Main Results:

  • Modification of diatomite with CeO2 nanoparticles successfully increased defect sites.
  • High loading of Pt single-atom species (above 1 wt.%) was achieved on the modified support.
  • The resulting catalyst exhibited good performance in the selective hydrogenation of phenylacetylene to styrene.
  • Enhanced metal-support interaction was observed, maintaining atomic dispersion of Pt.

Conclusions:

  • CeO2 nanoparticle modification of diatomite is an effective strategy to create robust anchoring sites for single-atom catalysts.
  • This approach enables high-loading single-atom catalysts on silica-based materials.
  • The developed Pt single-atom catalyst demonstrates promising activity for selective hydrogenation, showcasing potential for industrial applications.