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AssigneeEngelhard Corporation
InventorsGerald S. Koermer, Ahmad Moini
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A selective catalytic material is used to catalyze selective oxidation of unsaturated hydrocarbons, e.g., olefins, in the presence of carbon monoxide. The catalytic material comprises phosphated ceria containing from 0.1 to 20, preferably from 1 to 5, percent by weight phosphate component (calculated as elemental phosphorus). The phosphated ceria may be made by mixing particles of ceria and a solution containing phosphates to disperse the desired amount of phosphate component on the ceria and calcining the particles after separation of them from the solution. The resulting selective catalytic material is contacted under oxidizing conditions with a gas stream containing an oxidant, e.g., air, carbon monoxide and one or more unsaturated hydrocarbons. The selective catalytic material (24a) may be disposed on a sensor (24) disposed within a conduit (18) downstream of a conventional treatment catalyst (16) to evaluate the performance of the latter by measuring the extent of unsaturated hydrocarbon oxidation catalyzed by the selective catalytic material (24a) in the treated gas.
A catalytic material effective for catalyzing selective oxidation of a gaseous unsaturated hydrocarbon component in the presence of a gaseous oxidant and carbon monoxide, the catalytic material comprising a phosphated ceria comprised of ceria particles having a phosphate component dispersed thereon in an amount such that the phosphate component, calculated as elemental phosphorus, comprises from about 0.1 to 20 percent by weight of the phosphated ceria, the weight of the ceria being calculated as CeO.sub.2.
A catalytic material effective for catalyzing selective oxidation of a gaseous unsaturated hydrocarbon component in the presence of a gaseous oxidant and carbon monoxide, the catalytic material comprising a phosphated ceria comprised of ceria particles having a phosphate component dispersed thereon in an amount such that the phosphate component, calculated as elemental phosphorus, comprises from about 1 to 5 percent by weight of the phosphated ceria, the weight of the ceria being calculated as CeO.sub.2, and the ceria particles after being phosphated having a surface area of from about 10 to 100 m.sup.2 /g.
A method of making a phosphated ceria catalytic material effective for catalyzing selective oxidation of a gaseous unsaturated hydrocarbon component in the presence of a gaseous oxidant and carbon monoxide, the method comprising:
A method for determining the content of gaseous unsaturated hydrocarbon in a gas also containing a gaseous oxidant and carbon monoxide comprises:
Dependencies are inferred from the claim text.