Neutron studies of nanostructured CuO-Al{sub 2}O{sub 3} NOx removal catalysts

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Nanostructured powders of automotive catalytic system CuO0Al{sub 2}O{sub 3}, targeted for nitrogen oxides (NOx) removal under lean-burn engine conditions, were investigated using neutron diffraction and small-angle neutron scattering. The crystal phases, structural transformations and microstructure of 10 mol% Cu-Al{sub 2}O{sub 3} powders are characterized according to the heat-treatment conditions. These properties are correlated with the pore structure and NOx removal efficiency determined by nitrogen adsorption isotherm, electron spin resonance, and temperature programmed reaction measurements. The {gamma}-(Cu, Al){sub 2}O{sub 3} phase and the mass-fractal-like aggregate of particles (size {approx} 26 nm) at annealing temperatures below 900{degrees}C were found to be crucial ... continued below

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18 p.

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Ozawa, Masakuni & Loong Chun-Keung July 14, 1997.

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Nanostructured powders of automotive catalytic system CuO0Al{sub 2}O{sub 3}, targeted for nitrogen oxides (NOx) removal under lean-burn engine conditions, were investigated using neutron diffraction and small-angle neutron scattering. The crystal phases, structural transformations and microstructure of 10 mol% Cu-Al{sub 2}O{sub 3} powders are characterized according to the heat-treatment conditions. These properties are correlated with the pore structure and NOx removal efficiency determined by nitrogen adsorption isotherm, electron spin resonance, and temperature programmed reaction measurements. The {gamma}-(Cu, Al){sub 2}O{sub 3} phase and the mass-fractal-like aggregate of particles (size {approx} 26 nm) at annealing temperatures below 900{degrees}C were found to be crucial to the high NOx removal performance. The transformation to bulk crystalline phases of {alpha}-Al{sub 2}O{sub 3} + CuAl{sub 2}O{sub 4} spinel above {approximately}1050{degrees}C corresponds to a drastic drop of Nox removal efficiency. The usefulness of neutron-scattering techniques as well as their complementarity with other traditional methods of catalytic research are discussed.

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18 p.

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INIS; OSTI as DE97054136

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  • International conference on neutron scattering (ICNS), Toronto (Canada), 17-21 Aug 1997

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  • Other: DE97054136
  • Report No.: ANL/IPNS/CP--94279
  • Report No.: CONF-970814--
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 561224
  • Archival Resource Key: ark:/67531/metadc693661

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  • July 14, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 16, 2015, 5:13 p.m.

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Ozawa, Masakuni & Loong Chun-Keung. Neutron studies of nanostructured CuO-Al{sub 2}O{sub 3} NOx removal catalysts, article, July 14, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc693661/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.