[CCoE Notice] SABIC ChBE Seminar Series Presents: Using Transient Response to Study Half-Cycle Rates of the NO SCR Redox Cycle

[Grayson, Audrey A]

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[Using Transient Response to Study Half-Cycle Rates  of the NO SCR Redox Cycle]

[William P. Partridge, Ph.D.  Oak Ridge National Laboratory Oak Ridge, TN  Friday, October 19, 2018, 10:30 am Room L2, Building D2]

[Selective-catalytic-reduction (SCR) is a leading technology for automotive exhaust emissions control.  The need to improve catalyst efficiency, durability, cost and control, correspondingly drives research to advance detailed catalyst understanding.  Oak Ridge National Laboratory and Cummins have an ongoing twenty one year partnership with this same motivation, which has contributed to many products now in the on-road market; the partnership currently focuses on SCR, and the presentation shares some of the latest research results.     An operando experimental method for monitoring relative variations in half-cycle rates of the Cu redox-cycle model of SCR will be demonstrated, along with a kinetic model for predicting the same.  Conversion inflections (CI) can occur at SCR onset within Cu/SCR catalysts; transient CI involves initial conversion growth to an intermediate value greater than exists at steady state (SS) before degrading to the SS value.  While similar CI has been reported for Fe/SCR catalysts as being due to NH3 inhibition, Cu/SCR CI is inconsistent with a similar origin. Rather, Cu/SCR CI is due to imbalances in the redox-half-cycle rates, and will occur when reduction is faster than oxidation. The temporal CI shape varies with the redox-cycle kinetic parameters and model formulation, and can be used to study the same. The presentation will demonstrate the first measurements of dynamic half-cycle rate balancing at SCR onset, how we use CI and onset transients to study variations in half-cycle rates under Standard, Fast and NO2 SCR, and present the first redox-cycle model showing CI. The new operando method and model provides a basis for better understanding the SCR redox process, and determining the individual half-cycles kinetic model formulation and parameters.      Bill Partridge (William Powell Partridge, Jr.) is Distinguished Research Staff at Oak Ridge National Laboratory in the Fuels Engines and Emissions Research Center, and a graduate of the University of Tennessee (BSME 1988, MSME 1990) and Purdue University (PhD 1995). He has over thirty years of experience developing and applying advance diagnostics based on a wide range of technologies including laser-induced fluorescence (LIF) and planar LIF, absorption, Raman, multi-photon spectroscopy, holographic interferometry, mass spectrometry, phosphor and organic-sensor fiber-optic probes and pyrometry.]

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