Limitations of Global Kinetic Parameters for Automotive Application Queen's Univ of Belfast

Format:

Conference/Event

Author/Creator:

Stewart, Stewart, author.

Contributor:

Douglas, Roy

Glover, Laura

Goguet, Alexandre

Conference Name:

SAE 2012 International Powertrains, Fuels & Lubricants Meeting (2012-09-18 : Malmo, Sweden)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

With emission legislation becoming ever more stringent,automotive companies are forced to invest heavily into solutions tomeet the targets set. To date the most effective way of treatingemissions is through the use of catalytic converters. Currenttesting methods of catalytic converters whether being tested on avehicle or in a lab reactor can be expensive and offer littleinformation about what is occurring within the catalyst. It is forthis reason and the increased price of precious metal that kineticmodeling has become a popular alternative to experimentaltesting.Many kinetic models and kinetic parameters have appeared inliterature in recent years, a comparison of these kineticparameters for the global reaction of CO oxidation is presented.The parameters from literature are used for an experimentalsimulation using the Queen's University kinetic model and thencompared with experimental data obtained from a synthetic gasreactor and kinetic parameters determined at the Queen'sUniversity, Belfast. The model uses a global kinetic techniqueintegrating the Langmuir Hinshelwood approach for kinetics, withthe rate constant obtained from the Arrhenius equation andinhibitions determined using the Voltz method. A quasi-steady statetwo-dimensional approach has been used for flow, with the catalystsplit into meshes in both the axial and radial directions.The parameters are then used for various simulations, varyinggas concentrations of CO and O₂ for light-off experiments. Varyingthe gas concentrations highlights the lack of versatility of theparameters, as the parameters for global kinetic models generallyonly work for simulations for the experimental conditions in whichthey were determined. Finally a drive cycle simulation is comparedwith data from emissions testing of a vehicle. This identifies howthe kinetic parameters determined from reactor simulations apply todrive cycle simulations, a short coming identified inliterature.The comparisons in this study will highlight the problems thatare present in global kinetic modeling for automotive applicationand indicate the direction for further developments in catalystmodeling

Notes:

Vendor supplied data

Publisher Number:

2012-01-1638

Access Restriction:

Restricted for use by site license