Development of Three-Way Catalysts Enhanced NOx Purifying Activity
Growing concerns about the depletion of raw materials as vehicle ownership continues to increase is prompting automakers to look for ways of decreasing the use of platinum-group metals (PGMs) in the exhaust systems. This research has developed a new catalyst with strong robustness against fluctuations in the exhaust gas and excellent nitrogen oxide (NOx) conversion performance. One of the key technologies is a new OSC material that has low surface area (SA) and high OSC performance. We enhanced the pyrochlore- ceria/zirconia (CZ) which has a very small SA. In order to enhance the heat resistance and promote the OSC reaction, we selected and optimized the additive element. This material showed high OSC performance especially in the temperature range of 400 degrees or less. Another key technology is washcoat structure that has high gas diffusivity by making connected pore in the washcoat (New pore forming technology). The connected pore means that some pores are connected each other unlike conventional structure which has isolated pores. Compared with the conventional washcoat structure, the new technology has high gas diffusivity. As a result, the developed catalyst showed high NOx purifying activity which enabled nearly 30% reduction of precious metal usage.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
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Supplemental Notes:
- Abstract reprinted with permission of SAE International.
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Authors:
- Chinzei, Isao
- Saito, Yoshinori
- Morikawa, Akira
- Kato, Satoru
- Ohashi, Tatsuya
- Hirao, Tetsuhiro
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Conference:
- WCX World Congress Experience
- Location: Detroit Michigan, United States
- Date: 2018-4-10 to 2018-4-12
- Publication Date: 2018-4-3
Language
- English
Media Info
- Media Type: Web
- Features: Figures; References; Tables;
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Serial:
- SAE Technical Paper
- Publisher: Society of Automotive Engineers (SAE)
- ISSN: 0148-7191
- EISSN: 2688-3627
- Serial URL: http://papers.sae.org/
Subject/Index Terms
- TRT Terms: Catalysts; Exhaust gases; Heat resistant materials; Nitrogen oxides; Pore size distribution
- Subject Areas: Energy; Environment; Highways; Vehicles and Equipment;
Filing Info
- Accession Number: 01728685
- Record Type: Publication
- Source Agency: SAE International
- Report/Paper Numbers: 2018-01-0942
- Files: TRIS, SAE
- Created Date: Jan 28 2020 9:46AM