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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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Enhanced hydrogen storage in Ni/Ce composite oxides.

Léonard E A Berlouis1, Clotilde Jubin, Brian G McMillan

  • 1WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, UK. l.berlouis@strath.ac.uk

Physical Chemistry Chemical Physics : PCCP
|November 16, 2007
PubMed
Summary

Dried, non-calcined nickel ceria catalysts exhibit significantly enhanced hydrogen emission after activation. The amorphous phase and spillover mechanism are crucial for this high hydrogen storage capacity, exceeding calcined materials.

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanomaterials

Background:

  • Ceria-based materials are investigated for hydrogen storage applications.
  • Coprecipitation is a method for synthesizing mixed oxide catalysts.
  • Understanding hydrogen interaction with nickel-ceria systems is key for optimizing performance.

Purpose of the Study:

  • To investigate the hydrogen emission properties of dried, non-calcined coprecipitated nickel ceria systems.
  • To explore the role of activation and material structure on hydrogen storage.
  • To elucidate the mechanisms of hydrogen interaction and release.

Main Methods:

  • X-ray Diffraction (XRD) and Brunauer-Emmett-Teller (BET) analysis for structural and surface area characterization.
  • X-ray Photoelectron Spectroscopy (XPS) to determine surface composition.
  • Thermal analysis techniques including Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), and Temperature Programmed Desorption Mass Spectrometry (TPD-MS) for hydrogen emission analysis.

Main Results:

  • Coprecipitated nickel ceria powders are largely amorphous, despite showing some similarities to calcined ceria via XRD and BET.
  • Thermal analysis revealed two distinct hydrogen emission features (low and high temperature) in both activated and unactivated samples.
  • Activated samples emitted significantly more hydrogen (~0.24 wt%) at lower temperatures compared to unactivated samples, suggesting enhanced interaction and spillover mechanisms. CO and CO2 emissions correlated with high-temperature hydrogen release, indicating a water-gas shift reaction.

Conclusions:

  • Dried, non-calcined nickel ceria exhibits superior hydrogen emission properties compared to calcined counterparts, likely due to its amorphous nature.
  • Hydrogen activation facilitates increased hydrogen release via surface dissociation and spillover mechanisms into the ceria support.
  • The observed water-gas shift reaction suggests potential for further optimization in hydrogen production or storage applications.