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Related Experiment Videos

[Diffusion reflectance spectroscopy of ZrO2 phase structure].

Ying-Ying Zhan1, Guo-Hui Cai, Yi-Hong Xiao

  • 1National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou 350002, China.

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|March 16, 2005
PubMed
Summary

Higher temperatures convert zirconia catalysts to monoclinic phase, but alumina stabilizes the tetragonal phase. Platinum reduction alters phase structure, forming more monoclinic zirconia on the surface.

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Area of Science:

  • Materials Science
  • Catalysis
  • Surface Chemistry

Context:

  • Zirconia (ZrO2)-based catalysts are crucial in various chemical processes.
  • Understanding the phase structure of zirconia is essential for optimizing catalyst performance.
  • Calcination temperature, alumina addition, and platinum reduction significantly influence zirconia's phase stability.

Purpose:

  • To investigate the surface and bulk phase structures of ZrO2-based catalysts using Diffusion Reflectance Spectroscopy (DRS).
  • To determine the effects of calcining temperature, Al2O3 addition, and platinum reduction on zirconia phase transformations.
  • To correlate surface and bulk phase structures using complementary techniques like XRD, DTA, and XPS.

Summary:

  • Elevated calcining temperatures promote the conversion of undoped zirconia to the monoclinic phase.

Related Experiment Videos

  • Incorporating aluminum oxide (Al2O3) stabilizes the tetragonal phase of zirconia.
  • Platinum reduction in Pt/ZrO2 catalysts induces phase transitions, favoring monoclinic zirconia formation, particularly on the catalyst surface compared to the bulk.

    • Impact:

    • Provides insights into controlling zirconia phase structure for enhanced catalytic activity.
    • Highlights the surface-specific phase changes during platinum reduction, crucial for catalyst design.
    • Demonstrates the utility of DRS in conjunction with other techniques for detailed catalyst characterization.