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Catalyst Characterization with the Hitachi Hd-2000 STEM

Published online by Cambridge University Press:  02 July 2020

D.A. Blom ,
L.F. Allard ,
B.C. Gates  and
P.W. Park
D.A. Blom
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831-6064
L.F. Allard
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831-6064
B.C. Gates
Affiliation:
University of California, Davis
P.W. Park
Affiliation:
Caterpillar, Inc. Peoria, IL61656-1875
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Abstract

New EPA regulations limiting the emissions of NOx from diesel engines will require a reduction by 70% in the amount of NOx leaving the tailpipe of diesel powered vehicles by the year 2004. Some form of exhaust aftertreatment will need to be applied to diesel engines to meet the new stricter requirements. One option is to develop a “lean-NOx” catalyst that uses a hydrocarbon reductant (e.g. diesel fuel) to convert NOx into N2 and O2. Two of many constraints on such a catalyst are that it achieve a high degree of conversion over a fairly broad temperature range and that the amount of reductant necessary to reach the 70% goal is sufficiently small as to be cost effective. A number of promising systems comprise either platinum group metals or base metals on oxide supports. Such catalyst systems typically involve near-atomic dispersions, or ultra-fine clusters, of the heavy metal species on the oxide support.

Type
Characterization of Catalysts (Organized by S. Bradley)
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 1066 - 1067
Copyright
Copyright © Microscopy Society of America 2001

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References

references

1.)Fiori, C. E.et al., The Theoretical Characteristic to Continuum Ratio in Energy Dispersive Analysis in the Analytical Electron Microscope. in Microbeam Analysis-1982, pages 57-71, 1982.Google Scholar
2.) Research sponsored by the U.S. Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the Heavy Vehicle Propulsion Materials Program, under contract DE-AC05-00OR22725 with UT-Batelle, LLC.Google Scholar