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The Development of Low Precious-Metal, Rare-Earth Oxide (REO) Catalysts for Vehicle Emission Control in Emerging Markets
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 05, 2001 by SAE International in United States
Annotation ability available
Event: SAE 2001 World Congress
Low-cost automotive catalysts have been developed that contain 20-30% of the precious metals (7-15 g/ft3) commonly used in conventional catalysts, while providing a high efficiency of emissions control and durability for vehicles operating in emerging market countries. These catalysts were reformulated by replacing the Pd, Pt and Rh mixtures with optimized mixtures of rare-earth oxides (REOs). Laboratory studies demonstrated that these aged REO catalysts (80,000 km) with unleaded Chinese fuels reduce vehicle emissions by an average of 99%, 80% and 92% for CO, HC and NOx, respectively, when operating as a three-way catalyst in a closed-loop control mode at a stoichiometric air-to-fuel ratio. REO catalysts with 7.6g/ft3 of precious metals were tested on in-use Chinese Volkswagen Santanas with carbureted engine. Several strategies for air injection were tested on these vehicles. Emissions were reduced by an average of 70% for CO, 55% for HC and 30% for NOx using the ECE 15.04 drive cycle. The retrofit of in-use vehicles with REO catalysts can be effective when a system approach that includes a vigorous I/M program, the right catalyst for a required conversion rate, proper location to place the catalyst and fuel quality.
- Ronald G. Hurley - Ford Research Laboratory, Ford Motor Co.
- Jackie A. Lymburner - Ford Research Laboratory, Ford Motor Co.
- John Li - Ford Research Laboratory, Ford Motor Co.
- George Wu - Ford Research Laboratory, Ford Motor Co.
- Haren Gandhi - Ford Research Laboratory, Ford Motor Co.
- Reggie Zhan - Ford Asia Pacific, Ford Motor Co.
- Weijian Han - Ford Asia Pacific, Ford Motor Co.
- Lifeng Xu - Ford Asia Pacific, Ford Motor Co.
- Dennis Schuetzle - Ford Asia Pacific, Ford Motor Co.
- Huang Ronghuang - Kunming Institute of Precious Metals
- Deng Deguo - Kunming Institute of Precious Metals
CitationHurley, R., Lymburner, J., Li, J., Wu, G. et al., "The Development of Low Precious-Metal, Rare-Earth Oxide (REO) Catalysts for Vehicle Emission Control in Emerging Markets," SAE Technical Paper 2001-01-0225, 2001, https://doi.org/10.4271/2001-01-0225.
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