This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Development of Low Temperature Active Material for Three Way Catalyst
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 05, 2016 by SAE International in United States
Annotation ability available
Engine technologies using efficient combustion and down-sizing turbo have become important in order to reduce automotive CO2 emissions. However, the exhaust gas temperature also becomes lower by these technologies. As a result, the catalyst performance becomes lower. Therefore it is necessary to develop low temperature active catalysts to reduce emissions. This research was focused on Pd/CeO2, and it’s able to oxidize CO at low temperatures.
In order to increase the catalyst activity, the addition of some elements to the CeO2 was studied. Zn addition was found to have an advantage to reduce the CO light off temperature by 60 °C. Then, we tried to clarify the cause of improvement. As a result, it made clear that the Zn addition promotes the active oxygen release from the CeO2 surface.
However, repeated engine exhaust gas tests indicated a decline in purification performance. The carbonate inhibited the active oxygen release from the CeO2, resulting in declining the catalyst purification performance. To improve the performance of catalyst, Ba was added which has a strongly CO2-absorption element because of high basicity. This modified Ba/Zn/CeO2 showed no decline in purification performance even after the repeated engine test.
Next the effect of Ba/Zn/CeO2 addition into conventional catalyst was evaluated by vehicle emissions in LA4 cycle test. As a result, emission was improved by about 10% as compared to no addition. The newly developed material, Ba/Zn/CeO2 has been employed in mass-production catalysts for the 2016 model year.
- Masanori Hashimoto - Honda R&D Co. Ltd.
- Yoshiyuki Nakanishi - Honda R&D Co. Ltd.
- Hiroshi Koyama - Honda R&D Co. Ltd.
- Syouji Inose - Honda R&D Co. Ltd.
- Hiroki Takeori - Honda R&D Co. Ltd.
- Takayuki Watanabe - Honda R&D Co. Ltd.
- Takeshi Narishige - Honda R&D Co. Ltd.
- Tatsuya Okayama - Honda R&D Co. Ltd.
- Yukio Suehiro - Honda R&D Co. Ltd.
CitationHashimoto, M., Nakanishi, Y., Koyama, H., Inose, S. et al., "Development of Low Temperature Active Material for Three Way Catalyst," SAE Technical Paper 2016-01-0932, 2016, https://doi.org/10.4271/2016-01-0932.
- Haruta , M. Low-temperature Combustion Catalysts-Mainly for CO Oxidation- Journal of the Japan Petroleum Institute 37 5 480 491 1994
- Date , M. , Haruta . M. Support Effects on the Catalysis of Gold Nanoparticles and Their Applications, Catalysts & Catalysis 47 1 8 13 2005
- Meng-Fei Luo Catalysis Letters 50 3 205 209 1998
- Slavinskaya E.M. Applied Catalysis B 166-167 91 103 2015
- Yoshiyuki , N. Hiroki , Masanori T. , Takayuki H. W Honda R&D Technical Review 22 2
- Delley , B. An All-Electron Numerical Method for Solving the Local Density Functional for Polyatomic Molecules J. Chem. Phys. 92 508 1990
- Delley , B. From molecules to solids with the DMol3 approach J. Chem. Phys. 113 7756 2000
- Vosko , S. H. , Wilk , L. , Nusair , M. spin-dependent electron liquid correlation energies for local spin density calculations: a critical analysis Can. J. Phys. 58 1200 1980
- Claude B J.CHEM.SOC.FARADAY TRANS. 1994 90 7 1023 1028