Ce containing, V-free mobile denox catalyst
AssigneeCristal USA Inc.
InventorsSteven Mark Augustine, David Monroe Chapman, Mark Barrett Watson
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Abstract
A catalyst for removal of NOx from exhaust gas, containing cerium oxide and titanium dioxide, wherein a first portion of the cerium oxide forms at least one agglomerate of cerium oxide crystallites interdispersed in the titanium dioxide, and a second portion of the cerium oxide forms at least one island on a surface of the titanium dioxide, a method for producing the catalyst, a process for selectively reducing NOx levels in an exhaust gas using the catalyst, and an SCR canister containing the catalyst therein.
Claims39
A catalyst comprising at least one agglomerate of crystallites comprising cerium oxide interdispersed in titanium dioxide, and at least one island comprising cerium oxide on a surface of the titanium dioxide.
A promoted TiO2 support comprising
- titanium dioxide;
- at least one agglomerate of crystallites comprising cerium oxide interdispersed in the titanium dioxide;
- at least one island comprising cerium oxide on a surface of the titanium dioxide;
- and at least one promoter selected from the group consisting of aluminum, phosphorus, lanthanum, zirconium, silicon, niobium, strontium, boron, tungsten, molybdenum, manganese, cobalt, chromium, silver, bismuth, copper, europium, tin, zinc, praseodymium, antimony, iron, and oxides thereof.
Dependencies are inferred from the claim text.