Metals and Ceramics Division - Oak Ridge National Laboratory

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Future Plans 1. Capture intellectual properties and document technical reports (Lean- NOx project). 2. Study catalyst durability (P, S and thermal sintering) of various de NOx catalyst technologies. 3. Continue searching for and testing new materials for DPF filters. 4. Conduct an accelerated sulfur aging test to identify a degradation mechanism of a NOx sensor. Travel None Status of FY 2005 Milestones 1. Lean- NOx project has been completed. The durability study of various catalyst technologies begins. 2. Finalizing non-disclosure agreement with a supplier to obtain samples of its new DPF material. 3. The computational molecular modeling concept has been developed to evaluate NOx selectivity of a sensor material in the presence of CO and O2.
Development of NOx Sensors for Heavy Vehicle Applications Timothy R. Armstrong, David L. West, Fred C. Montgomery Oak Ridge National Laboratory CRADA No. ORNL 01-0627 with Ford Motor Company Objective The proposed project seeks to develop technologies and materials that will facilitate the development of NOx and ammonia sensors. The development of low-cost, simple NOx will facilitate the development of ultra-low NOx emission engines, directly supporting the OHVT goals. Technical Highlights • Initiated round robin testing with collaborators by fabricating a large lot (15) of prototype sensing elements. • Initiated collaboration with 2 universities to study surface of electrode materials with XPS and Raman scattering. Data should shed light on sensing mechanism. • Modified test equipment and procedures to study effect of H2O on sensing element performance and stability. • Demonstrated that one candidate electrode material was unstable under DC electrical bias in the presence of H2O. • Discovery points out need for multiple test stands, as degradation occurs slowly over time spans of a week or more. Future Plans • Initiate and complete Raman investigation of reaction mechanisms. • Determine roles of electrode composition and processing in observed H2O vapor instability. • Construct 2 nd test stand dedicated to long-duration testing. • Develop rapid screening test for electrode sensitivity to H2O vapor. • Investigate use of low-frequency AC bias and its potential for ameliorating electrode instability in the presence of H2O vapor. Status of FY 2005 Milestones (1) Optimize the electrode design (geometry) to maximize output signal. (03/05) (2) Optimize the electrode morphology for the current class of lanthanum chromite electrocatalysts to maximize output signal. (05/05) (3) Evaluate sensor sensitivity to steam and develop protocol to minimize. (09/05)
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TEM Study of Microstructures in a C
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Synthesis of Nanocrystalline Cerami
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31N. The elastic properties are nee
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Introduction Frictional losses are
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All of the initial coefficients of
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Metals and Ceramics Division - Oak Ridge National Laboratory

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