Structural phase transitions and lean NO removal activity of copper-modified alumina

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Copper-modified alumina catalysts, designed for NO removal under lean-burn engine conditions, have been investigated from the viewpoint of the structural phase transition and thermal stability. The structural changes of crystalline components heat-treated at temperatures from 500{degrees}C to 1100{degrees}C were characterized by neutron diffraction (ND) method. In the as-prepared materials, powder-diffraction patterns revealed a mixture of crystalline {gamma}-Al{sub 2}O{sub 3} and CuO, and electron spin resonance (ESR) data showed well-dispersed Cu{sup 2+} cations coordinated by O atoms in an open-octahedron geometry. ND measurements confirmed the elimination of the CuO phase above 800{degrees}C, and suggested the stabilization of a {delta}-phase of alumina ... continued below

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14 p.

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Ozawa, Masakuni; Suzuki, Suguru; Loong, C.K.; Richardson, J.W. Jr. & Thomas, R.R. December 31, 1996.

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Copper-modified alumina catalysts, designed for NO removal under lean-burn engine conditions, have been investigated from the viewpoint of the structural phase transition and thermal stability. The structural changes of crystalline components heat-treated at temperatures from 500{degrees}C to 1100{degrees}C were characterized by neutron diffraction (ND) method. In the as-prepared materials, powder-diffraction patterns revealed a mixture of crystalline {gamma}-Al{sub 2}O{sub 3} and CuO, and electron spin resonance (ESR) data showed well-dispersed Cu{sup 2+} cations coordinated by O atoms in an open-octahedron geometry. ND measurements confirmed the elimination of the CuO phase above 800{degrees}C, and suggested the stabilization of a {delta}-phase of alumina by 10 mol% CuO-doping at 900-1000{degrees}C. This Cu-alumina catalyst which was subjected to heat treatment at 900{degrees}C in air showed a 20% lean de-NOx removal efficiency in a test using a model exhaust gas mixture of space velocity =00, 000 h{sup -1}.

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14 p.

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OSTI as DE97001997

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  • International symposium on surface nano-control of environmental catalysts and related materials, Tokyo (Japan), 25-27 Nov 1996

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  • Other: DE97001997
  • Report No.: ANL/IPNS/CP--90668
  • Report No.: CONF-9611133--3
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 442176
  • Archival Resource Key: ark:/67531/metadc675691

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Office of Scientific & Technical Information Technical Reports

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  • December 31, 1996

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  • July 25, 2015, 2:21 a.m.

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  • Aug. 4, 2016, 7:13 p.m.

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Ozawa, Masakuni; Suzuki, Suguru; Loong, C.K.; Richardson, J.W. Jr. & Thomas, R.R. Structural phase transitions and lean NO removal activity of copper-modified alumina, article, December 31, 1996; Illinois. (digital.library.unt.edu/ark:/67531/metadc675691/: accessed May 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.