Selective reduction of nitrogen monoxide by catalysts based on composites between solid acid and perovskite in the presence of excess oxygen
- Univ. Tuebingen (Germany)
The influence of the acid property of solid acids on the selective reduction of nitrogen monoxide by catalyst composites from perovskite and solid acid materials was examined for the case of excess of oxygen by using the perovskite YFeO{sub 3} and the solid acids TiO{sub 2} and ZrO{sub 2}. For comparison cordierite was likewise employed as support material. It is shown that the catalytic activity of the composite strongly depends on the acid properties of the solid acid: the activity is higher for materials with stronger acidity. For composites YFeO{sub 3}/ZrO{sub 2} the SCR activity starts around 250 C. Remarkably, the conversion of NO is completely selective to N{sub 2} and no dinitrogen monoxide is produced. Impregnation by the noble metals Pt and Ag is without influence on the SCR activity. A pronounced improvement of the lean-NO{sub x} activity is obtained for mixtures with the Cu exchanged zeolite Cu/ZSM-5.
- OSTI ID:
- 415486
- Journal Information:
- Materials Research Bulletin, Vol. 31, Issue 10; Other Information: PBD: Oct 1996
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
40 CHEMISTRY
33 ADVANCED PROPULSION SYSTEMS
COMPOSITE MATERIALS
CHEMICAL PREPARATION
YTTRIUM OXIDES
IRON OXIDES
TITANIUM OXIDES
ZIRCONIUM OXIDES
NITRIC OXIDE
REDUCTION
INTERNAL COMBUSTION ENGINES
CATALYTIC CONVERTERS
EXHAUST GASES
OXYGEN
CHEMICAL REACTIONS
SURFACES
ELECTRON MICROSCOPY