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Hurley, Ronald G.
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The Desulfation Characteristics of Lean NOx Traps

Ford Motor Co.-Joseph R. Theis, John J. Li, Justin A. Ura, Ronald G. Hurley
Published 2002-03-04 by SAE International in United States
This paper summarizes results from a large study on the desulfation characteristics of lean NOx traps. Degreened and thermally aged NOx trap formulations were poisoned with SO2 multiple times in a flow reactor. The effect of desulfation time and temperature on the recovery of NOx trapping efficiency was evaluated after the poisonings. The relative effectiveness of the reducing agents (CO and H2) used during the desulfation was evaluated for one of the formulations.The results indicate that the high temperatures required for desulfation (e.g., 700°C and above) result in thermal degradation of NOx traps that had been degreened at a lower temperature (e.g., 600°C), and therefore desulfation studies should be performed with traps that have already been exposed to the desulfation temperatures or higher prior to the poisoning. NOx trap formulations can differ in their desulfation characteristics, as two of the formulations studied could be desulfated effectively at 725°C, whereas the third formulation was more difficult to desulfate and required a desulfation temperature near 750°C. The results indicate that hydrogen is the more effective desulfation agent,…
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General Emissions Research and Development

Ronald G. Hurley, Jerry Summers
  • Special Publication (SP)
  • SP-1631
Published 2001-05-07 by SAE International in United States

Eight papers from the SAE International Spring Fuels & Lubricants Meeting & Exhibition. Topics covered range from research on particulate erosion of substrates to the influence of cycle characteristics on city buses. The information pertained in this collection provides the reader with an understanding of the effect on emissions on a global basis. This includes papers from India, Argentina, Finland, Italy, UK, and the United States. The information is useful in understanding the performance of emissions systems on a global basis. With papers authored by researchers at Corning Incorporated; Southwest Research Institute; FIAT Automobile, Ford Motor Company, Cummins Engine Company, and others. Subjects include: Particulate Erosion of Automotive Catalyst Supports; A Study of the Effect of Flow Pulsations on the Flow Distribution within Ceramic Contoured Catalyst Substrates; Fuel Permeation Performance of Polymeric Materials; Sulfur Control for NOx Sorbate Catalysts; Sulfur Sorbate Catalysts and Desulfation; Influence of Vehicle Test Cycle Characteristics on Fuel Consumption and Emissions of City Buses, and more.

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The Development of Low Precious-Metal, Rare-Earth Oxide (REO) Catalysts for Vehicle Emission Control in Emerging Markets

Ford Asia Pacific, Ford Motor Co.-Reggie Zhan, Weijian Han, Lifeng Xu, Dennis Schuetzle
Ford Research Laboratory, Ford Motor Co.-Ronald G. Hurley, Jackie A. Lymburner, John Li, George Wu, Haren Gandhi
Published 2001-03-05 by SAE International in United States
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…
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U.S. and European Automotive Emissions Technology

Donald D. Beck, Colin Jeffray, Ronald G. Hurley
  • Special Publication (SP)
  • SP-0957
Published 1993-03-01 by SAE International in United States
In recent years, research on emissions measurement and control technology has gained renewed and intense interest in the U.S. due to aggressive regulations proposed by the Federal Government and the state of California. Europe has also experienced increased activity in emissions research due to EEC-wide legislation that confirms the requirement for stringent automotive emission control. This publication details what is being done to meet the challenges automakers worldwide are facing. Partial contents include: sampling conditions for measurement of formaldehyde from methanol-fueled vehicle; fast multicomponent exhaust gas analyzer for motor development workplaces; the performance of Pd, Pt, and Pd-Pt catalysts in lean exhaust; a comparative study of gasoline and diesel passenger car emissions under similar conditions of use; and development of a high performance catalytic converter for a turbocharged gasoline engine using thin wall ceramic technology.