Catalyst for reducing nitrogen oxides in a waste gas and a process for catalytically reducing nitrogen oxides contained in a waste gas
Patent
·
OSTI ID:5563181
The present invention relates to a catalyst comprising at least a metal salt of heteropoly-acid, which is composed of a sort of heteropoly-acid and one or more metals selected from a group of the first transition metals of the periodic table. The catalyst of the present invention exhibits high activity and selectivity in the catalytic reduction of nitrogen oxides with ammonia at a temperature of from 250* to 550* C. And offers high resistivity to the poisonous effect of sulfur oxides. It does not entail a wasteful use of the reducing agent, because the catalyst of the present invention does not accelerate the reaction of the reducing agent such as ammonia with oxygen coexisting in the waste gas to be treated, which results in the elimination of the undesired excessive consumption of the reducing agent. Therefore, this invented catalyst may provide a commercially advantageous process for removing harmful constituents, nitrogen oxides from a waste gas which contains the same and additionally, in some cases, sulfur dioxides.
- Assignee:
- JGC Corp (Japan)
- Patent Number(s):
- US 4182745
- OSTI ID:
- 5563181
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
20 FOSSIL-FUELED POWER PLANTS
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
42 ENGINEERING
424000 -- Engineering-- Pollution Control Equipment-- (1980-1989)
AIR POLLUTION CONTROL
AMMONIA
CATALYST SUPPORTS
CATALYSTS
CATALYTIC CONVERTERS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CONTROL
ELEMENTS
EQUIPMENT
GASEOUS WASTES
HYDRIDES
HYDROGEN COMPOUNDS
INORGANIC ACIDS
METALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
REDUCTION
SYNTHESIS
TRANSITION ELEMENTS
WASTES
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
42 ENGINEERING
424000 -- Engineering-- Pollution Control Equipment-- (1980-1989)
AIR POLLUTION CONTROL
AMMONIA
CATALYST SUPPORTS
CATALYSTS
CATALYTIC CONVERTERS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CONTROL
ELEMENTS
EQUIPMENT
GASEOUS WASTES
HYDRIDES
HYDROGEN COMPOUNDS
INORGANIC ACIDS
METALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
REDUCTION
SYNTHESIS
TRANSITION ELEMENTS
WASTES