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In-line Hydrocarbon Adsorber for Cold Start Emissions - Part II
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Abstract
The in-line hydrocarbon (HC) adsorber is a passive after-treatment technology to address cold-start hydrocarbons in automotive engine exhaust gas. A major technical challenge of the in-line HC adsorber is the difference between the HC release temperature of the adsorber and the light-off temperature of the burn-off (BO) Catalyst. We call this phenomenon the “reversed-temperature difference”.
To reduce the reversed temperature difference, NGK has proposed a new “In-line HC Adsorber System” which consists of light-off (LO) Catalyst + Barrel Zeolite Adsorber (BZA), with a hole through the center, BO Catalyst and secondary air injection management (SAE 970266).
This, our latest paper, describes the evaluation of various adsorbents and the effect of the center hole on the Adsorber BZA.
The adsorber system, which had the Adsorber BZA with a 25mm ϕ center hole and adsorbent coated, confirmed 30% lower FTP NMHC emission versus a system with no center hole or adsorbent coating. These two systems had been RAT-A engine aged to an equivalent to 50,000 miles, and tested in the under-floor position on a vehicle equipped with a 3.8 liter engine. Further, adsorption and desorption performance of the adsorber BZAs and heat up rates of the BO Catalysts with different BZA center hole diameters are also discussed.
This In-line HC Adsorber System could be one of the potential technologies to meet LEV/ULEV and Stage-3/Stage-4 regulations, without suffering from thermal deterioration of the close-coupled catalyst in the manifold area.
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Citation
Noda, N., Takahashi, A., Shibagaki, Y., and Mizuno, H., "In-line Hydrocarbon Adsorber for Cold Start Emissions - Part II," SAE Technical Paper 980423, 1998, https://doi.org/10.4271/980423.Also In
References
- Patil M. D. Hertl W. Williams J. L. Nagel J. N. “In-Line Hydrocarbon Adsorber System for ULEV” SAE 960348 1996
- Abe F. Harada T. Ogawa M. “Adsorber-Catalyst for Exhaust Gas Purification, System for Exhaust Gas Purification, and Method for Exhaust Gas Purification” 1996
- Buhrmaster C. L. Locker R. J. Patil M. D. Nagel J. N. Socha L. S. “Evaluation of In-Line Adsorber Technology” SAE 970267 1997
- Noda N. Takahashi A. Mizuno H. “In-Line Hydrocarbon (HC) Adsorber System for Cold-Start Emissions” SAE 970266 1997
- Bonadies J. V. “Analysis of the FTP Performance of Metal Foil and Ceramic Substrate Catalytic Converters Using Statistical Methods” SAE 940742 1994
- Ballinger Todd H. Manning Wedny A. Lafyatis David S. “Hydrocarbon Trap Technology for the Reduction of Cold-Start Hydrocarbon Emissions” SAE 970741 1997