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Development of a High Performance Catalyzed Hydrocarbon Trap Using Ag-Zeolite
Technical Paper
2004-01-1275
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A high performance catalyzed hydrocarbon (HC) trap, consisting of a Ag-impregnated zeolite and a three-way catalyst (TWC), was developed to achieve the stringent exhaust regulations such as SULEV. To improve the HC retention ability and durability of Ag-zeolite, the effects of wash-coat loading, HCs species, space velocities (SV) etc. on HC desorption profiles upon heating-up were examined in detail. In the present study, a simulated durability test using a cyclic lean-stoichiometric aging, was developed and applied for durability evaluation. An ultraviolet visible near-infrared spectrophotometer (UV-Vis) showed that specific chemical species of Ag were responsible for the delay of HC desorption. After the cyclic aging, the retention effect of Ag was only seen with aromatic compounds. It was revealed that the HC retention effect on aromatic compounds was maintained at high SV values, which was confirmed by actual vehicle tests. To improve the emission performance for cold HCs and durability, various types of catalyzed HC traps consisting of Ag-zeolite and tri-metal TWCs, were prepared and evaluated after the simulated durability test. From these results, an optimized combination of HC trap and TWC was developed. A vehicle test was performed using a newly developed catalyzed HC trap aged with a bench engine. The developed catalyzed HC trap showed relatively good emission performance for cold HCs after bench engine aging for 100 hours at 700°C.
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Murakami, K., Tominaga, S., Hamada, I., Nagayama, T. et al., "Development of a High Performance Catalyzed Hydrocarbon Trap Using Ag-Zeolite," SAE Technical Paper 2004-01-1275, 2004, https://doi.org/10.4271/2004-01-1275.Also In
References
- Murakami K. Tominaga S. Itoh T. Hamada I. Higashiyama K. “Effect of Types of Zeolite and Impregnated Metal on Hydrocarbon Adsorption and Desorption characteristics” JSAE 20025618
- Nagayama T. Higashiyama K. Katogi K. Nakagawa S. Tominaga S. “Hydrocarbon Purification performance of Catalyzed Hydrocarbon Trap” JSAE20025619
- Higashiyama K. et al. “A Catalyzed Hydrocarbon Trap Using Metal-impregnated Zeolite for SULEV systems” SAE 2003-01-0815
- Kanazawa T. Sakurai K. “Development of the Automotive Exhaust Hydrocarbon Adsorbent” SAE 2001-01-0660 2001
- Yamamoto S. 30'th KSF(Kankyou Shokubai Forum) Japan 5 10 2003
- Kawabata. H. et al. 91th CATSJ Meeting Abstracts 1 2003
- Satsuma A. Shibata J. Hoshikawa S. “Activity Enhancement by Reaction Field: Selective Catalytic Reduction of NO over Ag Catalysis” Journal of Chemical Engineering of Japan 66 355 357 2002
- Yoshida T. et al. Japanese XAFS Society 2002
- Kawabata H. Shigetsu M. Misonoo K. “Method for Manufacturing Catalyst”
- Nagayama T. et al. “Hydrocarbon Emission Performance of Ag Impregnated Catalyzed Hydrocarbon Trap” JSAE20035618