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Modeling mass transport with microkinetics in monolithic NOx storage and reduction catalyst

Björn Wickman (Institutionen för teknisk fysik, Kemisk fysik) ; Andreas Lundström (Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik) ; Jonas Sjöblom (Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik) ; Derek Creaser (Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik)
Topics in Catalysis (1022-5528 ). Vol. 42-43 (2007), 1-4, p. 123-127.
[Artikel, refereegranskad vetenskaplig]

A 2D axisymetric model of a NOx storage and reduction catalyst monolith channel combining mass transport with a detailed kinetic model was created to evaluate the importance of mass transport in a Pt/BaO/Al2O3 washcoat. Results show that there are small radial gradients in stored species concentration early during transients. The Sherwood number calculated during the transient storage phase will not be constant in time nor space as a film correlation would predict, but instead shows a region of higher Sherwood number propagating through the channel as the storage reaches completion. It is concluded that incorporating detailed mass transport provides a better spatially resolved picture of the dynamics of the proposed reaction mechanism and minimises the risk of arriving at false intrinsic kinetics during the development of a microkinetic model.

Nyckelord: Transient, 2D, microkinetic, modeling, washcoat, Pt/BaOAl2O3, NSR



Denna post skapades 2007-05-29. Senast ändrad 2015-03-30.
CPL Pubid: 42195

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kemisk fysik (1900-2015)
Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik (2005-2014)

Ämnesområden

Katalys
Molekylära transportprocesser i kemisk processteknik

Chalmers infrastruktur