초록 ▼

A catalyst which, by means of a reduction reaction at ambient temperature, permits the elimination of nitrates and nitrites in waters. The catalyst comprises a combination of a noble metal and a non-noble metal supported on or incorporated into the structure of a support which, in elemental and anhy

A catalyst which, by means of a reduction reaction at ambient temperature, permits the elimination of nitrates and nitrites in waters. The catalyst comprises a combination of a noble metal and a non-noble metal supported on or incorporated into the structure of a support which, in elemental and anhydrous form, has the formula XYMgAl, in which X is at least one noble metal, Y is at least one non-noble metal, Mg is magnesium and Al is aluminum, the Mg and Al preferably forming the structure of a hydrotalcite or a mixed oxide deriving from a hydrotalcite.

대표청구항 ▼

The invention claimed is: 1. A process for treating waters to eliminate nitrates present in liquid phase therein, said process comprising (a) treating said waters with a bimetallic catalyst said bimetallic catalyst in elemental and anhydrous form, having a composition corresponding to the formula X

The invention claimed is: 1. A process for treating waters to eliminate nitrates present in liquid phase therein, said process comprising (a) treating said waters with a bimetallic catalyst said bimetallic catalyst in elemental and anhydrous form, having a composition corresponding to the formula XYMgAl wherein: X is at least one noble metal; Y is at least one non-noble metal; Mg is magnesium; and Al is aluminum, and (b) reducing the nitrates to nitrogen by adding a reducing agent. 2. A process in accordance with claim 1, wherein the reducing agent is selected from the group consisting of hydrogen, formic acid, hydrocarbons and combinations thereof. 3. A process in accordance with claim 1, wherein Mg and Al form a hydrotalcite structure. 4. A process in accordance with claim 1, wherein the noble metal is selected from the group consisting of Pd, Pt, Ru, Ir and Rh. 5. A process in accordance with claim 1, wherein the noble metal is present in a proportion of 0.1 to 30% by weight, preferably from 0.5 to 15% by weight, based on the total weight of the catalyst. 6. A process in accordance with claim 1, wherein the noble metal is Pd. 7. A process in accordance with claim 1, wherein the non-noble metal is selected from the group consisting of Cu, Sn, Zn, In, Ni, Ag, Fe and Co. 8. A process in accordance with claim 1, wherein the non-noble metal is present in a proportion 0.5 to 10% by weight, based on the total weight of the catalyst. 9. A process in accordance with claim 1, wherein the non-noble metal is Cu.