Catalyzed decomposition of nitrogen oxides on metal oxide supports
AssigneeUniversity of Florida Research Foundation, Inc.
InventorsRussell S. Drago, Krzysztof Jurczyk
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Abstract
This invention is a nitrogen oxide decomposition process and catalyst employed therein. The catalyst is a metal oxide, such as CoO, on a basic metal oxide-containing support, such as a MgO support.
Claims26
A process for the decomposition of nitrogen oxides, comprising contacting a nitrogen oxide with a mixed oxide catalyst under conditions effective to decompose the nitrogen oxide to nitrogen and oxygen, wherein the catalyst comprises a first metal oxide selected from the oxide of Mn, Fe, Co, Ni, Cu, Zn, or mixtures thereof on a metal oxide support consisting essentially Of MgO, CaO, ZnO, TiO.sub.2, MoO.sub.3 --CoO--Al.sub.2 O.sub.3, ZnO--Al.sub.2 O.sub.3, TiO.sub.2 --MgO, Al.sub.2 O.sub.3 --ZnO, TiO.sub.2 --Al.sub.2 O.sub.3, TiO.sub.2 --ZnO, MgO--CuO and MgO--NiO or mixtures thereof, and wherein the catalyst is prepared by contacting the support with the nitrate salt of said first metal oxide, and wherein the catalyst is calcined prior to use under conditions effective to decompose to metal oxide said nitrate salt of said first metal oxide without sintering or intercalation of the catalyst.
A mixed oxide catalyst composition useful in a process for the decomposition of nitrogen oxides, wherein the composition comprises a first metal oxide selected from the oxide of Mn, Fe, Co, Ni, Cu, Zn, or mixtures thereof on a metal oxide support consisting essentially of MgO, CaO, ZnO, TiO.sub.2, MoO.sub.3 --CoO--Al.sub.2 O.sub.3, ZnO--Al.sub.2 O.sub.3, TiO.sub.2 -MgO, Al.sub.2 O.sub.3 --ZnO, TiO.sub.2 --Al.sub.2 O.sub.3, TiO.sub.2 --ZnO, MgO--CuO and MgO--NiO or mixtures thereof, and wherein the catalyst is prepared by contacting the support with the nitrate salt of said first metal oxide, and wherein the catalyst is calcined prior to use under conditions effective to decompose to metal oxide said nitrate salt of said first metal oxide without sintering or intercalation of the catalyst.
A process for the decomposition of nitrogen oxides, comprising contacting a gaseous feed containing one or more nitrogen oxides with a mixed oxide catalyst under conditions effective to decompose nitrogen oxide components to nitrogen and oxygen, wherein the catalyst is selected from the group consisting of Cu.sub.3 Mg.sub.5 Al.sub.2 (OH).sub.20 CO.sub.3.yH.sub.2 O;
- Ni.sub.3 Mg.sub.5 Al.sub.2 (OH).sub.20 CO.sub.3.yH2O;
- Mn.sub.3 Mg.sub.5 Al.sub.2 (OH).sub.20 CO.sub.3.yH.sub.2 O or Co.sub.3 Ca.sub.5 Al.sub.2 (OH).sub.20 CO.sub.3.yH.sub.2 O and is prepared by adding a base to an aqueous composition containing cobalt nitrate, calcium nitrate, and aluminum nitrate such that a gel forms;
- drying the gel;
- and calcining the dry gel to form the mixed metal oxide.
Dependencies are inferred from the claim text.