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A global description of DOC kinetics for catalysts with different platinum loadings and aging status

Paper ID Volume ID Publish Year Pages File Format Full-Text
47137 46462 2010 9 PDF Available
Title
A global description of DOC kinetics for catalysts with different platinum loadings and aging status
Abstract

Global kinetic models usually require a recalibration in case of catalyst aging or changes in the precious metal loading. In this contribution the lean oxidation kinetics of CO, propene and NO for five (Pt-γ-Al2O3) diesel oxidation catalysts (DOCs) with different platinum loadings and stages of aging are determined from isothermal steady-state experiments. HR-REM shows that for all catalysts the platinum particles have diameters larger than 8 nm, so that the catalysts are in the structure insensitive regime. It will be confirmed that in this case the catalytic activity is only proportional to the catalytically active surface which can be determined easily by CO-chemisorption experiments. In order to model the CO- and propene-oxidation kinetics for differently aged and platinum loaded catalyst, only one parameter, the catalytically active surface, has to be changed in the global kinetic models. The same is true for NO oxidation at higher temperatures, where platinum stays in an oxidized state.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ DOC kinetics for catalysts with different platinum loadings and aging status. ▶ Adaption of kinetics by scaling reaction rate with catalytically active surface. ▶ Catalytically active surface can be determined by light-off measurements.

Keywords
DOC; Aging; Global kinetic model; Simulation; Kinetic measurement
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A global description of DOC kinetics for catalysts with different platinum loadings and aging status
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 100, Issues 1–2, 11 October 2010, Pages 10–18
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us