Nitric oxide reduction with hydrogen on mixed metal oxide catalysts
Catalytic reduction of nitric oxide with hydrogen was investigated on a number of mixed oxide and oxide mixtures in a laboratory integral reactor using a feed gas containing 520 ppm of NO and 3000 ppm of H/sub 2/ in a nitrogen carrier gas to determine catalytic activity and ammonia formation. Then some of the more promising catalysts were tested in actual automobile exhaust to determine their feasibility in catalytic reactors for NO reduction. Highest yields of NH/sub 3/ at 90 percent conversion of NO or higher in the first test were observed with rare earth nickel iron oxide and copper-vanadium oxide, copper-nickel oxides, monel, platinum, palladium, and rhodium. Each of these catalysts showed stoichiometric conversion to NH/sub 3/ at a specific temperature. Platinum and palladium maintained this stoichiometric conversion up to 500 C; monel showed a sharp drop in NH/sub 3/ yield above the temperature of stoichiometric conversion (450 C). Lowest NH/sub 3/ maxima for NO conversion levels above 90 percent were observed with ruthenium, mixed ruthenium oxides, and a series of nickel- containing catalysts. When tested in auto exhaust, ruthenium and mixed ruthenium oxides were particularly active and appeared to exhibit true selectivity for reduction of NO to N/sub 2/. (Air Pollut. Abstr.)
- OSTI ID:
- 7341242
- Journal Information:
- Ind. Eng. Chem., Prod. Res. Dev.; (United States), Vol. 13:3; Conference: 165. American Chemical Society national meeting, Dallas, TX, USA, Apr 1973
- Country of Publication:
- United States
- Language:
- English
Similar Records
Reduction of nitric oxide with ammonia on noble metal catalysts
Auto exhaust control catalyst on silica cloth support
Related Subjects
AUTOMOBILES
EXHAUST GASES
NITROGEN OXIDES
REDUCTION
AIR POLLUTION
AMMONIA
CATALYSIS
CATALYSTS
HYDROGEN
METALS
PALLADIUM
PLATINUM
RUTHENIUM
CHALCOGENIDES
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
GASEOUS WASTES
HYDRIDES
HYDROGEN COMPOUNDS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
POLLUTION
REFRACTORY METALS
TRANSITION ELEMENTS
VEHICLES
WASTES
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)