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Experimentelle Untersuchung Und Modellbildung Von No - Speicherkatalysatoren

Experimentelle Untersuchung Und Modellbildung Von No - Speicherkatalysatoren

          
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About the Book

NOx-Speicherkatalysatoren werden zur NOx-Abreinigung aus sauerstoffreichen Motorabgasen verwendet. Unter sauerstoffreichen Bedingungen kann der Katalysator, der Bariumcarbonat enthalt, Stickoxide in Form von Nitraten speichern. Unter kurzzeitig reduzierenden Bedingungen wird der Katalysator wieder regeneriert. Es besteht ein signifikanter Unterschied der Zeitskalen zwischen der langsamen Speicherung und der sehr schnellen Regeneration, der nicht einfach durch unterschiedliche Kinetiken zu erklaren ist. Nach Gleichgewichtsbetrachtungen und Versuchen zur Herleitung des relevanten Reaktionssystems, wobei hier vor allem der Einfluss der Tragergaskomponenten H2O und CO2 von Bedeutung ist, werden zwei unterschiedlich detaillierte Modelle hergeleitet. Beiden liegt die Modellvorstellung zugrunde, dass die Speicherpartikel bei der Bildung des voluminosen Nitrats "zuquellen," wodurch sich ein erheblicher Diffusionswiderstand fur die weitere Einspeicherung ergibt, wahrend sich bei der Regeneration Risse und Poren bilden, die das Speichermaterial zuganglich machen. Im ersten Modell werden die Diffusion des Gases im Speichermaterial und die Gas-Feststoff-Reaktionen durch ein ortlich eindimensionales Difusions-Reaktions-Modell beschrieben. Man sieht die Frontbildung an Nitraten wahrend der Speicherung und die Regeneration uber der gesamten Korntiefe. Die Erkenntnisse dieses Modells werden im zweiten Modell zur Modellreduktion herangezogen und es wird ein ortlich eindimensionales Mehrphasenmodell fur den gesamten Monolithkanal hergeleitet. Die Ergebnisse zeigen die Komplexitat der Vorgange uber der Lange des Kanals bei vollstandiger und unvollstandiger Regeneration.


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Product Details
  • ISBN-13: 9783832512880
  • Publisher: Logos Verlag Berlin
  • Binding: Paperback
  • Language: German
  • Returnable: N
  • Spine Width: 0 mm
  • Width: 145 mm
  • ISBN-10: 3832512888
  • Publisher Date: 31 Jul 2006
  • Height: 210 mm
  • No of Pages: 150
  • Series Title: German
  • Weight: 700 gr


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