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Related Concept Videos

Catalysis02:50

Catalysis

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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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Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
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Non-thermal-plasma-activated de-NOx catalysis.

Rahman Gholami1, Cristina E Stere2, Alexandre Goguet3

  • 1School of Chemical Engineering and Analytical Science, The University of Manchester, Manchester M13 9PL, UK rgholami@manchester.ac.uk.

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|November 28, 2017
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Summary

Non-thermal plasma (NTP) combined with catalysts offers a promising solution for removing nitrogen oxides (NOx) from exhaust emissions. These hybrid systems show synergistic effects, enhancing de-NOx efficiency, especially at low temperatures.

Keywords:
NOx removalNOx storage reductioncatalystplasmaselective catalytic reduction

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Area of Science:

  • Catalysis
  • Plasma Science
  • Environmental Engineering

Background:

  • Conventional de-NOx technologies struggle with low exhaust temperatures and impurities.
  • Non-thermal plasma (NTP) offers an alternative approach for NOx emission control.

Purpose of the Study:

  • To review the combination of non-thermal plasma (NTP) with catalyst systems for NOx removal.
  • To evaluate the synergistic effects of hybrid plasma-catalyst systems on de-NOx efficiency.

Main Methods:

  • Review of various hybrid plasma-catalyst systems.
  • Analysis of NTP's role in converting NO to NO2 and forming oxygenated species.
  • Examination of NTP application in different phases of NOx storage and reduction.

Main Results:

  • Hybrid plasma-catalyst systems demonstrate synergistic effects, outperforming individual components.
  • NTP enhances de-NOx efficiency by converting NO to NO2 and facilitating subsequent reduction reactions.
  • NTP pretreatment or application in specific phases improves catalyst performance at low temperatures.

Conclusions:

  • Plasma-catalyst systems are effective for NOx removal from lean-burn sources.
  • NTP plays a crucial role in enhancing catalytic activity and selectivity for NOx reduction.
  • This technology offers a sustainable solution for managing emissions in a changing world.