Neutron studies of nanostructured CuO-Al2O3 NOx removal catalysts
Creators
- 1. Nagoya Institute of Technology, Tajimi (Japan)
- 2. Argonne National Lab., IL (United States)
Description
Nanostructured powders of automotive catalytic system CuO0Al2O3, 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-Al2O3 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 γ-(Cu, Al)2O3 phase and the mass-fractal-like aggregate of particles (size ∼ 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 α-Al2O3 + CuAl2O4 spinel above ∼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
Availability note (English)
Available from INIS in electronic form; ALSO AVAILABLE FROM OSTI AS DE97054136; NTIS; INIS; US GOVT. PRINTING OFFICE DEP.Additional details
Publishing Information
- Imprint Pagination
- 20 p.
- Report number
- ANL/IPNS/CP--94279
Conference
- Title
- International conference on neutron scattering (ICNS)
- Dates
- 17-21 Aug 1997
- Place
- Toronto (Canada)
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 30022471
- Subject category
- S36: MATERIALS SCIENCE;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- AIR POLLUTION CONTROL; ALUMINIUM OXIDES; ANNEALING; CATALYSTS; COPPER OXIDES; ELECTRON SPIN RESONANCE; EXHAUST GASES; MICROSTRUCTURE; NEUTRON DIFFRACTION; NITROGEN OXIDES; PHASE TRANSFORMATIONS; PORE STRUCTURE; POWDERS
- Descriptors DEC
- ALUMINIUM COMPOUNDS; CHALCOGENIDES; COHERENT SCATTERING; CONTROL; COPPER COMPOUNDS; DIFFRACTION; FLUIDS; GASEOUS WASTES; GASES; HEAT TREATMENTS; MAGNETIC RESONANCE; MICROSTRUCTURE; NITROGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; POLLUTION CONTROL; RESONANCE; SCATTERING; TRANSITION ELEMENT COMPOUNDS; WASTES
Optional Information
- Contract/Grant/Project number
- Contract W-31-109-ENG-38
- Funding organization
- USDOE Office of Energy Research, Washington, DC (United States)
- Secondary number(s)
- CONF-970814--