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Heterogeneous Catalysis01:22

Heterogeneous Catalysis

143
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
143
Catalysis02:50

Catalysis

23.1K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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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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Shape-controlled ceria-based nanostructures for catalysis applications.

Zhen-An Qiao1, Zili Wu, Sheng Dai

  • 1Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge; TN 37831 (USA), Fax: (+1) 865-576-5235.

Chemsuschem
|October 12, 2013
PubMed
Summary
This summary is machine-generated.

Ceria nanoshapes significantly impact catalytic performance by altering surface properties. Controlling cerium oxide morphology offers a novel strategy to enhance catalyst activity and selectivity without changing composition.

Keywords:
catalysisceriananoshapeshape-controlledsurface chemistry

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Cerium oxide (ceria) is a crucial oxide catalyst with diverse applications, including automotive exhaust treatment, chemical reactions, and energy systems.
  • The catalytic efficiency of ceria is intrinsically linked to its interfacial structures and the morphology of its nanocrystals.

Purpose of the Study:

  • To review recent advancements in ceria nanoshapes, focusing on their roles as catalysts and catalyst supports.
  • To elucidate the synthesis, characterization, catalytic properties, surface chemistry, and reaction mechanisms of nanostructured ceria.

Main Methods:

  • Review of recent research on ceria nanoshapes.
  • In situ spectroscopy studies to investigate nanostructured ceria.
  • Theoretical modeling to understand the ceria shape effect.

Main Results:

  • Ceria's surface structure dictates catalytic activity and selectivity via geometry, vacancy formation energy, defects, and unsaturated sites.
  • Nanostructured ceria exhibits morphology-dependent catalytic behavior.

Conclusions:

  • Controlling ceria nanomorphology provides a method to tune catalytic performance without altering chemical composition.
  • The shape effect in ceria catalysis is a significant area for future catalyst design and optimization.