Preparation of high surface area substituted LaMnO/sub 3/ catalysts
Perovskite catalysts in the LaMnO/sub 3/ family have been produced with A site substitutions of Sr, Pb, K and Ce, and with B site substitutions of Ni, Co, Li and Mg from nitrate solutions by freeze drying, spray drying and precipitation. Freeze drying in some cases gave a single phase perovskite at a lower temperature than the other techniques. Substitution of the cations Sr or K for La in LaMnO/sub 3/ produced catalysts with the highest conversion rates. Freeze dried La/sub 0.5/ Sr/sub 0.5/MnO/sub 3/ had the highest surface area (due, in part, to lower temperature heat treatments) and the highest device activity of the group. B site modifiers (Li and Mg) produced active catalysts but also diluted available active sites. Substitution of Ni for Mn gives highly active catalysts while similar substitutions of Co for Mn show less activity.
- Research Organization:
- Bell Labs., Murray Hill, NJ
- OSTI ID:
- 7361649
- Journal Information:
- Am. Ceram. Soc. Bull.; (United States), Journal Name: Am. Ceram. Soc. Bull.; (United States) Vol. 55:5; ISSN ACSBA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALLOYS
CERIUM ADDITIONS
CERIUM ALLOYS
CHEMICAL PREPARATION
COBALT ADDITIONS
COBALT ALLOYS
LANTHANUM COMPOUNDS
LEAD ADDITIONS
LEAD ALLOYS
LITHIUM ADDITIONS
LITHIUM ALLOYS
MAGNESIUM ADDITIONS
MAGNESIUM ALLOYS
MANGANATES
MANGANESE COMPOUNDS
NICKEL ADDITIONS
NICKEL ALLOYS
OXYGEN COMPOUNDS
POTASSIUM ADDITIONS
POTASSIUM ALLOYS
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
RARE EARTH COMPOUNDS
STRONTIUM ADDITIONS
STRONTIUM ALLOYS
SURFACE PROPERTIES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS