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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...

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Updated: Jul 2, 2026

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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A study on N2O catalytic decomposition over Co/MgO catalysts.

Qun Shen¹, Landong Li, Jinjun Li

¹Department of Environmental Nano-materials, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China.

Journal of Hazardous Materials

|September 6, 2008

Summary

Cobalt oxide catalysts on magnesium oxide (Co/MgO) efficiently decompose nitrous oxide (N2O). The Co/MgO catalyst achieved 100% N2O conversion, even with impurities, demonstrating excellent stability for industrial applications.

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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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Area of Science:

Catalysis
Environmental Chemistry
Materials Science

Background:

Nitrous oxide (N2O) is a potent greenhouse gas requiring effective abatement strategies.
Development of efficient catalysts for N2O decomposition is crucial for environmental protection.

Purpose of the Study:

To synthesize and evaluate oxide-supported cobalt catalysts for nitrous oxide decomposition.
To identify the active phase and understand the catalytic mechanism of the most effective catalyst.
To assess catalyst performance under simulated industrial conditions and evaluate its stability.

Main Methods:

Co-precipitation method for catalyst preparation.
X-ray Diffraction (XRD) and X-ray Photoelectron Spectroscopy (XPS) for material characterization.
Kinetic analysis to determine the active species and reaction mechanism.
N2O decomposition tests under various conditions, including simulated tail gas.

Main Results:

Co/MgO catalyst with 15% cobalt loading exhibited the highest activity, achieving 100% N2O conversion above 700 K.
Characterization and kinetic analysis identified the active phase as highly dispersed Co(3)O(4) within the MgO matrix.
Presence of NO, O2, and H2O negatively impacted N2O decomposition, but 100% conversion was still achievable at 800 K under simulated nitric acid plant tail gas.
The Co/MgO catalyst demonstrated good durability with no significant activity loss over a 100-hour stability test.

Conclusions:

Co/MgO is a highly effective catalyst for nitrous oxide decomposition.
The active species is Co(3)O(4) dispersed on MgO, facilitating high catalytic activity.
The catalyst shows promise for industrial N2O abatement due to its performance under simulated conditions and excellent stability.