Catalysts for controlling auto exhaust emissions including hydrocarbon, carbon monoxide, nitrogen oxides and hydrogen sulfide and method of making the catalysts
This patent describes a catalyst suitable for use as a catalyst for auto emission control characterized by an alumina support with components deposited thereon consisting essentially of lanthana as a stabilizer in an amount of about 1 to 10% by weight expressed as La/sub 2/O/sub 3/ which is either in the form of lanthana only or in the form of lanthana-rich rare earth oxides where the La/sub 2/O/sub 3/ is at least 50% by weight of the total rare earth oxides, 1-20% by weight of ceria as a promoter, at least 0.5 to about 5% by weight of an alkali metal oxide as a promoter, and a catalytically-effective amount of one or more platinum group metals, the improvement comprising adding H/sub 2/S gettering capability by having the catalyst further comprise: (a) an H/sub 2/S gettering metal oxide selected from the group consisting of oxides of Ni, Fe and mixtures thereof in an amount from an H/sub 2/S gettering effective amount up to 10 weight %, provided that when the H/sub 2/S gettering metal oxide is just NiO, the maximum concentration of the NiO in the first 300 micron layer is at least about twice its average concentration throughout the support; and (b) wherein the alumina support can have additionally from 0 to 20% SiO/sub 2/ present.
- Assignee:
- W.R. Grace and Co., Conn., New York, NY
- Patent Number(s):
- US 4780447
- OSTI ID:
- 6760573
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020900 -- Petroleum-- Environmental Aspects
33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AUTOMOBILES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC CONVERTERS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
CONTROL
ELEMENTS
EMISSION
ENGINES
EQUIPMENT
GETTERING
HEAT ENGINES
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INTERNAL COMBUSTION ENGINES
IRON COMPOUNDS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
METALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
QUANTITY RATIO
RARE EARTH COMPOUNDS
RARE EARTHS
SILICON COMPOUNDS
SILICON OXIDES
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
VEHICLES