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A catalyst for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from exhaust gas comprising a zeolite having a silica/alumina molar ratio of greater than 55, and at least 1.5%, by weight, each of nickel and cobalt incorporated therein. A second embodiment of the i

A catalyst for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from exhaust gas comprising a zeolite having a silica/alumina molar ratio of greater than 55, and at least 1.5%, by weight, each of nickel and cobalt incorporated therein. A second embodiment of the is an adsorber catalyst system for use in the removal of the oxides of nitrogen from waste gas, the adsorber/catalyst system comprising the following components: (1) a zeolite having a silica/alumina ratio of greater than 55; (2) at least 1.5%, by weight, each of nickel and cobalt incorporated therein; and, (3) an adsorber component comprising a mixture of gamma alumina support and a adsorber material selected from the group consisting of metal oxides, metal hydroxides, metal carbonates and mixed metal oxides.

대표청구항 ▼

1. A catalyst for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from exhaust gas consisting of an extruded zeolite-based composite honeycomb structure having a composition comprising: (i) a zeolite having a silica/alumina ratio of greater than 55 and constit

1. A catalyst for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from exhaust gas consisting of an extruded zeolite-based composite honeycomb structure having a composition comprising: (i) a zeolite having a silica/alumina ratio of greater than 55 and constituting at least 30% by weight of the structure; (ii) at least 1.5%, by weight, each of nickel and cobalt incorporated therein, and (iii) an adsorber component comprising a mixture of gamma alumina support and an adsorber material selected from the group consisting of strontium oxide (SrO), barium oxide (BaC), calcium oxide (GaO), cesium oxide (Cs2O), lithium oxide (Li2O), lanthanum oxide (La2O3), potassium oxide (K2O), magnesium oxide (MgO), manganese oxide (MnO2), sodium oxide (Na2O), mixtures of La2O3and CeO with TiO2and ZrO2,BaTiO3,BaZrO3,LaMnOx(x ranging from 2 to 4), BaMgCu2O6and LaBaSrFe2O6. 2. The catalyst of claim 1, wherein the adsorber material is BaO or K2O or mixtures thereof. 3. The catalyst of claim 1 wherein the adsorber material is mixed metal oxide perovskite material of either BaMgCu2O6or LaBaSrFe2O6. 4. The catalyst of claim 1 wherein the gamma alumina support includes a stabilizing agent selected from the group consisting of lanthanum oxide, barium oxide, strontium oxide and yttrium oxide. 5. The catalyst of claim 1 wherein the catalyst exhibits a surface area of at least 200 m2/g. 6. The catalyst of claim 1 wherein the catalyst exhibits a surface area of at least 300 m2/g. 7. The catalyst of claim 1 wherein the extruded honeycomb structure comprises at least 400 cells/in2,exhibits a modulus of rupture strength of at least 1500 psi, and contains 50-60% zeolite by weight. 8. An adsorbent/catalyst system for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from exhaust gas comprising (i) a zeolite having a silica/alumina ratio of greater than 55; (ii) at least 1.5%, by weight, each of nickel and cobalt incorporated in the zeolite; and (iii) an adsorber component comprising a mixture of gamma alumina support material and an adsorber material consisting of a mixed metal oxide perovskite material of either BaMgCu2O6or LaBaSrFe2O6.