Reactions Over A Double Layer Tri-Metal Three-Way Catalyst

960801

02/01/1996

Event
International Congress & Exposition
Authors Abstract
Content
The reactions over a commercially available double layer tri-metal type (Pt, Pd, Rh) passenger car catalyst were analysed. A parameter study was performed in synthetic exhaust gases at: steady state conversion, periodic oscillations, and controlled transients. The influences of gas phase composition, temperature, adiabatic heat of reaction and lambda oscillations were investigated. The reactions of nitrogen oxides, propene and carbon monoxide were simultaneously analysed. Fast response emission analysers were used to record the dynamic properties of the catalysts.
The catalyst was found to have high conversion rates and high oxygen storage capacity at relatively low temperatures. The presence of sulphur dioxide was found to reduce the conversion of CO and NOx substantially. An emission increase of 40-70 % was observed for steady state conditions and at oscillating conditions the increase was more than 100%. The experimental results were simulated in a dynamic model and a simplified reaction mechanism which explained the differences was proposed. The implications for catalyst diagnostics were discussed.
Meta TagsDetails
DOI
https://doi.org/10.4271/960801
Pages
23
Citation
Jobson, E., Hjortsberg, O., Andersson, S., and Gottberg, I., "Reactions Over A Double Layer Tri-Metal Three-Way Catalyst," SAE Technical Paper 960801, 1996, https://doi.org/10.4271/960801.
Additional Details
Publisher
Published
Feb 1, 1996
Product Code
960801
Content Type
Technical Paper
Language
English