Conversion Performance Prediction of Thermal-Deteriorated Three-Way Catalyst: Surface Reaction Model Development Considering Platinum Group Metals and co-Catalyst Waseda University

Format:

Book

Conference/Event

Author/Creator:

Yamakawa, Yukihiro, author.

Contributor:

Inoue, Ryoya

Kubo, Yunosuke

Kusaka, Jin

Yamaguchi, Kyohei

Conference Name:

15th International Conference on Engines & Vehicles (2021-09-12 : Capri, Italy)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

Three-way catalyst (TWC) converters can purify harmful substances such as carbon monoxide (CO), nitrogen oxides (NOx), and hydrocarbons (HC) from gasoline engines. However, a large amount of CO, NOx, and HC could be emitted before the TWC reaching its light-off temperature during cold start, and its performance deteriorates due to thermal deterioration during high-load driving. In this work, a simulation model is developed to predict the light-off conversion performance of the Pd / CeO2-ZrO2 catalysts with different degrees of thermal deterioration. The TWC model is built by using axisuite, a commercial software by Exothermia S.A. The model considers detailed surface reactions and main factor of the deterioration mechanisms. For the detailed reaction mechanism, the adsorption, desorption, and surface reactions of each gas species that occur at active sites of platinum group metal (PGM) particles are considered based on the Langmuir-Hinshelwood mechanism. Model gas experiments are performed to identify each reaction rate parameter. The PGM particles supported on the co-catalyst CeO2-ZrO2 have two active sites with different properties presented on the particles' surface region and the three-phase boundary (TPB) region where the PGM, CeO2ZrO2 of the co-catalyst, and the gas meet. TPB active site is much more active than PGM surface active site. As the main factor of the deterioration mechanism, the quantitative changes of the two active sites related to the PGM sintering generated during the catalyst deterioration are accounted for in the model. With sintering, the occupancy of the TPB active site on the PGM decreases. As a result, the TWC model is capable of predicting the light-off conversion performance of thermal-deteriorated Pd / CeO2-ZrO2 catalyst

Notes:

Vendor supplied data

Publisher Number:

2021-24-0077

Access Restriction:

Restricted for use by site license