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Insight into Interparticle Hydrogen Spillover Driven by Remote Metal Oxides.

Kohsuke Mori1,2, Akihito Fujimoto1, Kazuki Shun1

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ACS Applied Materials & Interfaces
|July 21, 2025
PubMed
Summary
This summary is machine-generated.

Interparticle hydrogen spillover, where atomic hydrogen moves between different catalyst particles, was investigated. This phenomenon was observed with specific metal oxide supports, offering new catalyst design strategies.

Keywords:
cerium oxidecoupling of benzenehydrogen spilloverinterparticlemetal oxidestitanium oxidetungsten oxide

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Area of Science:

  • Heterogeneous catalysis
  • Surface science
  • Materials chemistry

Background:

  • Hydrogen spillover involves H2 dissociation and hydrogen diffusion on solid supports.
  • Intraparticle spillover is well-studied, but interparticle spillover remains less understood.
  • Interparticle spillover at interfaces is crucial for unique catalytic performances.

Purpose of the Study:

  • To systematically examine interparticle hydrogen spillover between different catalyst specimens.
  • To investigate the role of various metal oxide supports in facilitating or hindering spillover.
  • To provide insights for designing advanced catalyst supports.

Main Methods:

  • H2-temperature-programmed reduction (H2-TPR) to assess reduction temperatures.
  • In situ X-ray absorption fine structure (XAFS) for structural analysis.
  • Diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy for surface species identification.

Main Results:

  • Ni2+/TiO2 and Ni2+/WO3 showed decreased reduction temperatures when combined with Pt, indicating successful interparticle spillover.
  • Ni2+/CeO2 did not exhibit reduced reduction temperatures, suggesting it's an ineffective hydrogen acceptor in this context.
  • Interparticle reverse hydrogen spillover facilitated benzene/n-heptane coupling with Al-mont and TiO2-supported Pd.

Conclusions:

  • Interparticle hydrogen spillover is achievable with specific catalyst-support combinations (e.g., Pt/TiO2, Pt/WO3).
  • The choice of hydrogen acceptor material (e.g., CeO2) significantly impacts spillover efficiency.
  • This study provides valuable understanding and design principles for engineered catalysts utilizing interparticle spillover.