Catalysts are disclosed which have good activity and life when used to promote the conversion of hydrocarbons, carbon monoxide and nitrogen oxides contained in small concentrations in gaseous streams, to obtain the less noxious materials, carbon dioxide, water and nitrogen. The catalysts contain a c
Catalysts are disclosed which have good activity and life when used to promote the conversion of hydrocarbons, carbon monoxide and nitrogen oxides contained in small concentrations in gaseous streams, to obtain the less noxious materials, carbon dioxide, water and nitrogen. The catalysts contain a catalytically-promoting, platinum group metal component, a catalytically-promoting, base metal component added as a solid material, and an alumina support component, deposited on a macrosize carrier. The base metal component contains a metal selected from the group consisting of metals having an atomic number from 25 to 28 and rhenium. The base metal and alumina components are preferably composited before deposition on the macrosize carrier, and the composite may also contain the platinum group metal component before such deposition. The catalytically-promoting metal components and alumina support can be comminuted as a slurry, and the liquid medium of the slurry is preferably acidic. The macrosize carrier, bearing the catalytic components may be dried and, if desired, calcined. The catalysts contain platinum or palladium, especially platinum, and preferably, one or more of rhodium, ruthenium and iridium, especially rhodium, in order to promote adequately the simultaneous conversion of hydrocarbons, carbon monoxide and nitrogen oxides to less noxious materials.
대표청구항▼
A method of manufacturing a catalyst composition having a catalytically-promoting material on a solid, macrosize carrier, said catalytically promoting material comprising a platinum group metal component containing one or both of platinum and palladium, and a solid, finely-divided base metal compone
A method of manufacturing a catalyst composition having a catalytically-promoting material on a solid, macrosize carrier, said catalytically promoting material comprising a platinum group metal component containing one or both of platinum and palladium, and a solid, finely-divided base metal component containing one or more base metals having an atomic number from 25 to 28 and rhenium, and a solid, finely-divided alumina support, said base metal component being present in said catalyst composition in an amount greater than said platinum group metal component, the method including the steps of combining said support with one or more compounds of a platinum group metal, including at least one of platinum and palladium, while said compounds are contained in the same or different liquids, heating said alumina support after the aforesaid combining at a temperature sufficiently high to provide thereon said platinum group metal component maintaining at least a major amount of said base metal component in solid form throughout the manufacture of said catalyst composition, depositing said solid, finely-divided base metal component and said solid, finely-divided support on said carrier by forming a slurry or slurries of said support and of said base metal component in a liquid and contacting said carrier with a slurry or slurries of said solids in liquid, said solids being in either the same or different slurries, and drying said support after said contacting of said support with said slurry or slurries.
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이 특허에 인용된 특허 (3)
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