Catalyst for purification of diesel engine exhaust gas
AssigneeKH Chemicals Co., Ltd.
InventorYoung-Nam Kim
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Abstract
This invention provides a new catalyst for purification of diesel engine exhaust gas comprising a carrier of at least one sulfur-resistant refractory oxide and at least one catalytic metal, wherein at least one solid acid and/or sulfuric acid is carried on the carrier by adding at least one precursor of said solid acid and/or sulfuric acid during the preparation of the carrier, and preparation thereof. The catalyst of this invention is thermally and chemically durable and can effectively remove particulate matters, hydrocarbons and nitrogen oxides contained in the diesel engine exhaust gas at low temperatures.
Claims10
A catalyst for the purification of diesel engine exhaust gas comprising at least a catalytic metal and a carrier, wherein said catalytic metal is selected from a group consisting of platinum, palladium, rhodium, ruthenium, rhenium, and their mixtures, wherein said carrier is a zirconia-titania composite oxide which comprises sulfuric acid and at least one additional solid acid selected from a group consisting of oxides of tungsten and oxides of molybdenum, and said zirconia-titania composite oxide has a ratio of zirconia to titania between 10:90 and 90:10.
The process according to clam 6, wherein at least one precursor of oxides of silicon, aluminum, iron, tin and/or cerium is added to the solution of precursors of a zirconia-titania composite oxide before the co-precipitation of step (2).
Dependencies are inferred from the claim text.