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Citation Details
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Title:
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A simple model for lean NOx adsorber catalysts
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Category(s):
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Lean-NOx traps
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Author(s):
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C. S. Daw
Kalyana Chakravart
K. E. Lenox
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Conference:
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Proceedings of the Third Joint Meeting of the U.S. Sections of The Combustion Institute
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Publisher:
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N/A
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Year:
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2002
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Abstract:
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We describe a simple model for simulating the transient behavior of a lean NOx adsorber. The model is based on onedimensional
differential approximations of mass balance equations for nitrogen oxides (NOx) that can be integrated very
quickly (i.e., faster than real time). In this paper we focus specifically on the lean (or capture) phase of adsorber
operation. During this phase, NOx is removed from the exhaust gas and reversibly reacted with alkali metal oxides in
the monolith washcoat to form nitrates. We describe the driving force for the nitration reactions in terms of a pseudoequilibrium
sorption isotherm, which can be experimentally measured. The approach to (pseudo) equilibrium at each
axial location is controlled by diffusion across the boundary layer and solid-phase diffusion within the washcoat. Model
predictions are compared with experimental data for prototype adsorber materials, and future research directions are discussed.
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Full Text at:
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http://www.cleers.org/special_publications/chicago_01_29.pdf
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Times Viewed:
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3887
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Submitter Details
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Name:
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Vitaly Prikhodko
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Email:
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prikhodkovy@ornl
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Organization:
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Oak Ridge National Laboratory
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Date Submitted:
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2003-01-30
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