Catalyst, catalyst carrier, methods for their production (options) and the method of purification of waste gases from nitrogen oxides

 

(57) Abstract:

The invention relates to catalysts, catalyst carrier, process for their preparation and methods of purification of exhaust gases from the NOxincluding flue gases of thermal power plants, exhaust gases of cars, as well as in the production of nitric acid. Describes the composition of the catalyst for purification of exhaust gases from nitrogen oxides by the catalytic recovery of hydrocarbons in an oxidizing atmosphere containing in its composition modified zirconium dioxide, which is the composition of the composition, wt.%: n IU1m IU2About/the media, where IU1- noble metal; IU2- oxide of the transition metal; n = 0-2,0, m = 0-6,0, if n and m are not simultaneously equal to 0, and the media, which is a low-temperature cubic modification of zirconium dioxide stabilized with oxides of calcium, strontium, barium or mixtures thereof, in an amount not less than 1.0 wt.%, with a specific surface area of not less than 160 m2/, as the noble metal used silver, platinum or a mixture, as an oxide of the transition metal is used, copper oxide, cobalt, Nickel or their mixture. Also describes the methods for their preparation and method of cleaning exhaust when using hydrocarbons as reducing agents2-C16. 7 C. and 4 h.p. f-crystals, 3 tab., 1 Il.

The invention relates to a catalyst, catalyst carrier and method for cleaning exhaust gases from the NOxin oxidizing conditions in the presence of various C2-C16hydrocarbons for cleaning gases, including flue gases of thermal power plants, exhaust gases of cars, as well as in the production of nitric acid.

The process of catalytic purification of exhaust gases from the NOxis the catalytic reduction of nitrous oxide to molecular nitrogen in excess oxygen in the presence of hydrocarbon. Thus, the hydrocarbon must react selectively with nitric oxide, but not with adsorbed oxygen or oxygen catalyst. The effectiveness of the cleaning process is also determined by the nature of the restorative components in the exhaust gas.

For catalytic purification of exhaust gases from the NOxin the presence of reducing agents (hydrocarbon) with excess oxygen available catalytic systems containing, as a rule, oxides of transition metals: copper, cobalt, Nickel, iron, gallium, tin or metals: platinum, palladium, silver, gold, deposited either on the oxide system: aluminum oxide, Al-Si-O, ZrO2whether the LASS="ptx2">

The most active catalyst in the temperature region close to the real temperature of automobile motors, is Cu-ZSM-5 (A. Shichi, K. Katagi, A. Satsuma, T. Hattori. Influence of intracrystalline diffusion on the selective catalytic reduction of NO by hydrocarbon over Cu-MFI zeolite. Applied Catalysis B: Ennvironmental. 24 (2000) 97-105). However, such systems have several significant disadvantages, leading to restrictions on the use of data systems, including for a wide range of hydrocarbons:

1. The presence of CO in the reaction products for a number of catalysts due to incomplete oxidation of hydrocarbons during tests in the field of low temperatures.

2. The presence of diffusion limitations when used as a reductant WITH2-C3of hydrocarbons.

3. Irreversible deactivation of the catalyst caused by the interaction of aluminum from the zeolite framework with the active component, leading to the formation of surface compounds, significantly less active in the field of low temperatures.

According to literature data, in the reaction of selective reduction of nitrogen oxides by hydrocarbons in oxygen excess visible activity in the area of low temperatures show circumistances system containing oxides lean NOx reduction. Catalysis Today. 26 (1995) 169-183).

Known catalyst and method for the recovery of nitric oxide in the presence of propane in the copper-zirconium bearing catalyst (J. Pasel, V. Speer, C. Albrecht, F. Richter, H. Papp. Metal doped sulfated ZrO2as catalyst for the selective catalytic reduction (SCR) of NO with propane. Applied Catalysis. B: Environmental. 25 (2000) 105-113). The catalyst was prepared by impregnation on capacity solution of copper nitrate ZrO2representing a mixture of monoclinic and tetragonal phases of modifications with the surface 58 m2/,

So, for a catalyst containing 1.3 wt.% CiO on ZrO2when used as a reductant propane and a mixture of 0.1% NO,0,0827%3H6, 10,0% O2the rest helium, the maximum conversion of nitric oxide to nitrogen is 19% at 450oWith the bulk velocity 7600 h-1. By reducing the reaction temperature to 300-350oWith the conversion of nitric oxide is reduced to 4%.

When replacing the reductant in the process of recovery of nitric oxide with propane to propylene due to the higher reactivity of the latter (compared to propane), as a rule, there are different patterns for the reduction of nitrogen oxides, which will be determined by the chemical composition kataliza propylene oxide on Nickel-zirconium bearing catalyst (K. A. Bethke, D. Alt, M. C. Kung. NO reduction by hydrocarbones in an oxidizing atmospere over transition metal-zirconium mixed oxides. Catalysis Letters. 25 (1994) 37 to 48). The catalyst is prepared by coprecipitation method of joint nitrate salts of Nickel and zirconium. The precipitate is filtered off and dried at 100oC, and then calcined at 350oC for 3 hours So that the catalyst containing 7.7 wt.% NiO on ZrO2when the composition of the purified gas is 0.1% NO, 0.1% OF C3H6, 1% O2the rest is helium and the flow rate 13300 h-1conversion of nitric oxide to nitrogen is 61,9% and propylene to carbon dioxide and water - 84,1% at 328oC.

When cleaning waste gases from nitrogen oxides using as the reducing saturated hydrocarbon with a large carbon chain length, such as the Dean, the regularities of the process for C3hydrocarbons cannot be transferred clearly to10-hydrocarbons.

It is known that for the reaction of catalytic reduction of nitrogen oxide in the presence of a reducing agent Dean appreciable formation of molecular nitrogen is observed for copper - and tin-cobalt containing systems (G. Delahay, E. Ensuque, B. Coq, F. Figueras. Selective catalytic reduction of nitric oxide by n-decane on Cu/sulfated-zirconia catalysts in oxygen rich atmosphere. Effect of sulfur and copper content. J. Catalysis. 175 (1998) 7-15), (C. C. C is the congestion of 6.3 wt.% SnO2, 6.3 wt.% Soo/Al2ABOUT3the maximum conversion of nitrogen oxide to nitrogen, 37% is achieved at a temperature of 525oWhen the composition of the purified gas: 0,104% NO, 0,03%10H22, 11% O2, 7% H2O and flow rate 57900 h-1(C. C. Cheung, M. C. Kung. Influence of homogeneous decane oxidation on the catalytic performance of lean NOx catalysts. Catalysis Letters. 61. (1999) 131-138). The catalyst was prepared the five-impregnation on FC-Al2ABOUT3nitrate of cobalt with an intermediate stage of annealing at 500 and 800oAfter each impregnation. Prepared in this way, the catalyst is impregnated with an ethanol solution of tin dichloride. The sample is dried and calcined at 500oC.

Known catalyst containing 4.6 wt.% CuO on ZrO2. The catalyst was prepared by deposition of copper acetylacetonate onto the Zirconia surface 1342/g, representing a mixture of monoclinic and tetragonal phases of modification. The catalyst was dried at 120oC and calcined at 500oWith 3 hours Specific surface area of Zirconia when applying copper oxide does not change. For this catalyst the maximum conversion of nitric oxide to nitrogen 22% is observed when 300oWhen flow rate 70000 h-1and the following mixture: 0,1 decane on Cu/sulfated-zirconia catalysts in oxygen rich atmosphere. Effect of sulfur and copper content J. Catalysis. 175 (1998) 7-15).

When cleaning the exhaust gases of automotive engines in the process in a wide range range temperature, flow rate, oxygen concentration and the ratio of hydrocarbon/nitric oxide. This creates additional demands on the quality of the catalyst:

1. The stability of the active component of the catalyst and carrier when changing the process temperature in the range of 300-800oC.

2. The absence of diffusion braking when working with hydrocarbons, especially those with large chain length, type of the Dean, a component of diesel engines.

In this regard, the media for this kind of processes should not only be thermally stable, but to have a well-developed porous structure with transport pores (meso - and macropores). In this respect it is of interest to use as a media ZrO2. The Zirconia can be obtained in the form of various polymorphic modifications, of which the most thermodynamically stable phase is monoclinic structure. However, this phase is characterized by a low specific surface (10-30 m2/g), which requires a larger amount of catalyst to obtain a high q is thiones alkaline earth metal, cubic modification of ZrO2[A. S. Ivanova, G. M. Alikina, L. P. Soloviyova, V. P. Ivanov, S. N. Trukhan, V. A. Sadykov. MO-ZrO2catalysts for nitrogen oxides reduction by hydrocarbons in oxygen excess. Preparation and properties. React. Kinet. Catal. Lett. 59. (1996) 125-133]. Zirconium dioxide are produced either by the method of coprecipitation at constant pH and temperature of aqueous solutions of salts of adding base or of a mixture of the corresponding hydroxides followed by calcining at a temperature of 700-900oC. single-Phase samples representing the cubic phase of Zirconia with lattice parameter a= formed after annealing at 700oWith compositions containing at least 10 mol.% CaO and 25 mol.% SrO. Single-phase sample containing 5 mol.% SrO can be prepared only at 900oC. the Specific surface of the carrier with such a structure can reach 80-100 m2/, With less content promoting additives or the use of barium oxide, the main phases are Zirconia monoclinic or tetragonal modifications. These systems can selectively restore NOxbut at high temperatures (above 550oC).

Closest to the claimed technical substance is a catalyst and method for the recovery of nitric oxide in the presence of propane on zirconium bearing systems (Palestine converts nitrogen oxides into molecular nitrogen at high temperatures when used as a reductant propane. The catalysts are produced either by precipitation of the components, or their mixture with the subsequent stages of forming, drying and calcination at appropriate temperatures. The best performance is achieved when used as a modifying additive oxide of strontium. So when the composition of the purified gas is 0.1% NO, 0,13%3H8, 1% O2(vol.%), the rest is helium and the flow rate of the feed mixture 4000 h-1for the sample containing 1.7 wt.% SrO at 500oWith the conversion of nitric oxide to nitrogen is 49,0%, and at 590oWith - 95,0%. With the introduction of 4.2 wt. % SrO at 500 and 550oWith the conversion of nitric oxide to nitrogen is 73.4 and 93.0%, respectively.

In the present invention is an improved catalyst for use as a carrier.

The invention solves the problem of efficient removal of nitrogen oxides at low temperatures when used as a reductant hydrocarbon, C2-C16.

The problem is solved, we offer a catalyst for purification of exhaust gases from nitrogen oxides by the catalytic recovery of hydrocarbons in an oxidizing atmosphere containing as the carrier stable oxides of the alkaline earth metals zirconium dioxide in Viator further comprises an oxide of the transition metal and/or noble metal and is a composition of composition. wt.%: nMe1m IU2About/the media, where Me1- noble metal; Me2- transition metal; n is 0-2,0, m is 0-6,0; medium - else, if n and m are not simultaneously equal to 0.

The media is a low-temperature cubic modification of zirconium dioxide stabilized with oxides of calcium, strontium, barium or mixtures thereof, in amounts of 1.0 to 3.5 wt.%, with a specific surface area of not less than 160 m2/, as the noble metal used silver, platinum or a mixture, as an oxide of the transition metal is used, copper oxide, cobalt, Nickel or a mixture thereof.

The task is also solved by a method of preparation of the catalyst carrier for purification of exhaust gases from nitrogen oxides by the catalytic recovery of hydrocarbons in an oxidizing atmosphere. The media is prepared by adding an aqueous solution of ammonia to a mixed solution of nitrate salts Zirconia and alkaline earth metal containing a certain amount of surface-active substances (surfactants), followed by maintaining the suspension at an elevated temperature within 72-120 hours as surfactants using 1% solution of polyvinyl alcohol (PVA) or polyethylene oxide (PEO). Received WM is arshusha stage precipitation was washed with ethyl alcohol. The synthesized precipitation is dried first in air, then in a drying Cabinet at 110oC for 12-14 h, and then calcined in a stream of dry air in the temperature range 600-700oC for 4 h While getting low-temperature cubic modification of zirconium dioxide stabilized with oxides of alkaline earth metals, in an amount of 1.0 to 3.5 wt.% with the value of specific surface area of not less than 160 m2/,

The task is also solved by a method of preparation of the catalyst for purification of exhaust gases from nitrogen oxides by the catalytic recovery of hydrocarbons in an oxidizing atmosphere or by fotogaleria to the media, representing the low-temperature modification of zirconium dioxide stabilized with oxides of alkaline earth metals, transition metal oxide and a noble metal, thus obtain a catalyst of the above composition.

Either the catalyst is prepared by autoclaving the solution of salt of the transition metal compound of the noble metal and the carrier constituting the low-temperature modification of zirconium dioxide stabilized with oxides of alkaline earth metals, in an alkaline medium at a temperature not menei on capacity salts of transition metals, compounds of the noble metal and the carrier constituting the low-temperature modification of zirconium dioxide stabilized with oxides of alkaline earth metals, you get a catalyst of the above composition.

The task is also solved by a method of purification of waste gases from nitrogen oxides by the catalytic recovery of hydrocarbons in an oxidizing atmosphere in the presence of the above-mentioned zirconium bearing catalysts at temperatures 240-525oC. In a hydrocarbon use C2-C16the hydrocarbons.

The proposed catalysts are experiencing in the process of recovery NOxin the presence of propane, propylene or Dean in an oxidizing atmosphere. Testing is carried out in a flow reactor, in which load the required amount of catalyst and with a certain volumetric rate serves the gas to be cleaned. The reaction products analyzed by gas chromatography or by using IR and chemiluminescent analyzers. The efficiency of the process is characterized by the degree of conversion of NOxin N2. For catalysts for the selective conversion of nitric oxide in the presence of propane and propylene also determine the transformation of carbohydrate which oxygen is carried out at the composition of the purified gas: 0,1% vol. NO, 0,13% WITH3H8, 1,0 about. % O2the rest up to 100% helium at flow rate 4000 12500 h-1.

Tested in the catalytic reduction of NO by propylene in the excess of oxygen is carried out at the following composition of the purified gas: 0.2 vol% NO, 0,2 vol.% WITH3H8, 2,5 vol.% ABOUT2the rest up to 100% nitrogen at flow rate 18000 h-1.

Testing process of removal of nitrogen oxides by the Dean in excess of oxygen is carried out at the composition of the purified gas: 0,15% NO, 0,05% vol. WITH10H22, 7% vol. ABOUT2the rest up to 100% nitrogen at flow rate 11250 h-1.

Below are examples illustrating the change in performance of the cleaning process from the NOxdepending on the process conditions (reaction temperature and the type of hydrocarbon), the nature of the catalysts and methods for their preparation. The main characteristics of the process and used catalysts are presented in tables 1-3.

Examples 1-3 illustrate the preparation of a carrier.

The drawing illustrates radiographs media 1-3. Taking radiographs performed on the diffractometer HZG-4C using Cu K-radiation.

Example 1. Salt solution obtained by mixing 15 ml rustoleum maintaining the suspension at an elevated temperature within 72-120 hours The suspension is filtered, the precipitate washed with distilled water until no nitrate in the filtrate, then the precipitate is washed with ethyl alcohol. The precipitate is dried in air and then in an oven at 110oC for 12-14 h, and then calcined in a stream of dry air at 600-700oC for 4 h the resulting carrier has a composition, wt.%: 1.5 km North - 98,5 ZrO2(media 1).

Radiograph of the carrier 1 (drawing) corresponds to the cubic modification of zirconium dioxide with lattice parameter a= Twice the lattice parameter in this case is caused by distortions in the lattice of the zirconium dioxide due to the presence of Me2+cations, which is reflected in the appearance of the reflections in the diffraction peak (111). The specific surface of the carrier 1 is equal to 180 m2/,

Example 2. Similar to example 1. The difference is that the deposition serves a mixture of salt solutions, in which instead of salt nitrate calcium taken the solution of nitrates of strontium. The resulting carrier has a composition, by weight. %: 2,6 SrO - 97,4 ZrO2(media 2).

Radiograph of the carrier 2 (Fig.1) corresponds to the cubic modification of zirconium dioxide with lattice parameter a= Twice the lattice parameter is cations, this is reflected in the appearance of the reflections in the diffraction peak (111). In addition, for the media there are trace amounts of monoclinic modification of zirconium dioxide. The specific surface of the carrier 2 is equal to 170 m2/,

Example 3. Similar to example 1. The difference is that the deposition serves a mixture of salt solutions, in which instead of salt nitrate calcium taken a solution of nitrate of barium. The resulting carrier has a composition, wt.%: 3,3 HLW - 96,7 ZrO2(media 3).

Radiograph of the carrier 3 (drawing) corresponds to the cubic modification of zirconium dioxide with lattice parameter a= Twice the lattice parameter in this case is caused by distortions in the lattice of the zirconium dioxide due to the presence of IU2+cations, which is reflected in the appearance of the reflections in the diffraction peak (111). The specific surface of the carrier 3 is 160 m2/,

Examples 4-20 illustrate the preparation of the catalyst.

Example 4. 13 g of the carrier 1 are impregnated by capacity 7 ml of an aqueous solution of Cu(NO3)2(1.75 M), then air-dried with occasional stirring for 5 h at room temperature and at 100oWith 10 hours. End those is 2">

Example 5. Preparation of catalyst according to example 4, for which use the carrier 2. The composition of the catalyst corresponds to the formula, wt.%: 6,0 CuO/media 2.

Example 6. Preparation of catalyst according to example 4, for which use the carrier 3. The composition of the catalyst corresponds to the formula, wt.%: 6,0 CuO/media 3.

Example 7. 0,877 g of copper acetate was dissolved in 80 ml of distilled water in a quartz glass. In the solution with stirring enter 3,48 g of the carrier 1. After 0.5 h include mercury vapor lamp type DRL-250, the radiation of which is directed at the glass, the distance between the lamp and the glass is 5 see the Suspension of the carrier in a solution of copper acetate is stirred under the action of UV/visible light for 1.5 hours and Then the precipitate is filtered off and washed with four volumes of water. The precipitate is dried under IR lamp for 10 h and then calcined at 400oC/2 h

0,219 g of silver nitrate dissolved in 80 ml of water in a quartz beaker with stirring, to this solution was added 3.5 g of powder coated with copper oxide, calcined at 400oWith/2 hours After 0.5 h include mercury vapor lamp DRL-250 and the contents of the glass are mixed under the action of UV/visible light for 10 minutes Then the wasp is an increase of 10 hours, and then calcined at 400oWith/2 hours the catalyst Composition corresponds to the formula, wt.%: 0,2 Ag, 3,9 CuO/media 1.

Example 8. Sample get analogously to example 7 with the difference that 1,706 g of copper acetate dissolved in 150 ml of water and add a 8.9 g of the carrier 2. For the deposition of silver 0,562 g of silver nitrate dissolved in 200 ml of water and added 9.0 g of powder coated with copper oxide. The composition of the catalyst corresponds to the formula, wt.%: 0,2 Ag, 3,1 CuO/media 2.

Example 9. Sample get analogously to example 7 with the difference that 2,244 g of copper acetate was dissolved in 200 ml of water and add a 8.9 g of the carrier 3. For the deposition of silver 0,561 g of silver nitrate dissolved in 200 ml of water and added 9.0 g of powder coated with copper oxide. The composition of the catalyst corresponds to the formula, wt.%: 0,8 Ag, 3,8 CuO/media 3.

Example 10. 3,24 g of the carrier 1 and 130 ml nickelodeo solution containing 33 ml of water and 65 ml of 24% aqueous ammonia solution, 30,94 g NiCl26 H2Oh, is placed in the autoclave. The autoclave is heated to 100oC and maintained at this temperature for 48 hours the sample was Then washed with 0.1 M ammonia solution, dried at 110oC and calcined at 500oC/5 hours the Catalyst has a composition, wt.%: 1,3 NiO/media 1.

Example 11. Get sample by the use of the s sample according to example 10, for a carrier 3. The catalyst has a composition, wt.%: 1,3 NiO/media 3.

Example 13. Preparation of catalyst according to example 5. 10 g of powdered sample impregnated with 5 ml of a solution of silver nitrate (0,37 M), then dried at room temperature for 5 h at 100oC - 10 h and calcined at 400oWith/2 hours Calcined catalyst is additionally impregnated with 6 ml of nitric acid with a concentration of 23 wt.%. Then the catalyst was dried at 100oC/5 h and calcined at 400oWith/2 hours the catalyst Composition corresponds to the formula, wt.%: 2,0 Ag, 6,0 CuO/media 1.

Example 14. For cooking we sample from example 6 preparation of catalyst according to example 13. The composition of the catalyst corresponds to the formula wt. %: 2,0 Ag, 6,0 CuO/media 2.

Example 15. Preparation of catalyst according to example 7 with the difference that 10 g of the carrier 1 under stirring injected into 200 ml of an aqueous solution of copper acetate (0,06 M). The difference from example 7 in that instead of a salt of silver nitrate take 0,38 ml H2PtCl6(0.035 g Pt/ml). In 100 ml of water is introduced a solution of hexachloroplatinic acid and add 5 g of powder coated with copper oxide. Before exposure to UV/visible light in the solution is injected 1.2 ml methanol is p 16. For the preparation of the catalyst 10 g of powder of the carrier 3 are impregnated by capacity 5 ml of a solution of cobalt nitrate (0.20 M). The powder is dried at 100oC/10 h and calcined at 400oWith/2 hours the catalyst Composition corresponds to the formula, wt.%: 0,76 Soo/media 3.

Example 17. Preparation as in example 16, with the only difference that for the preparation of the catalyst used solution of cobalt nitrate with a concentration of 0.44 M the Composition of the catalyst corresponds to the formula wt. %: 1.65 COO/media 3.

Example 18. Preparation of catalyst according to example 15, for which use 15 g of the sample of example 2. Instead of the salt solution of copper acetate using 250 ml of a solution of cobalt nitrate with a concentration of 0.06 M For the deposition of platinum use of 0.43 ml of a solution of N2tl6(0.035 g Pt/ml). The composition of the catalyst corresponds to the formula, wt.%: 0,3 Pt, 0.2 COO/media 2.

Example 19. Preparation as in example 16, with the only difference that for the preparation of a catalyst using a silver nitrate solution with a concentration of 0.37 M the Composition of the catalyst corresponds to the formula, wt.%: 2,0 Ag/media 3.

Example 20. Preparation as in example 16, with the only difference that for the preparation of the catalyst used wear

As seen from the above examples and tables, the proposed catalysts allow to solve the problem of efficient removal of nitrogen oxides at low temperatures when used as a reductant hydrocarbon, C2WITH16.

1. The catalyst for purification of exhaust gases from nitrogen oxides catalytic recovery of hydrocarbons in an oxidizing atmosphere containing zirconium dioxide stabilized with oxides of alkaline earth metals, characterized in that the zirconium dioxide stabilized with oxides of alkaline earth metals, the catalyst contains as a carrier in the form of low-temperature cubic modification with a specific surface area of not less than 160 m2/g and further comprises an oxide of the transition metal and/or noble metal and is a composition of composition, wt. %:

n IU1m IU2About/media

where IU1- noble metal;

IU2there is a transition metal;

n = 0-2,0, m = 0-6,0;

media - else, if n and m are not simultaneously equal to 0.

2. The catalyst p. 1, characterized in that the noble metal is used as silver, platinum or a mixture thereof.

3. The catalyst p. MESI.

4. The catalyst p. 1, characterized in that as the carrier for the catalyst used low-temperature cubic modification of zirconium dioxide stabilized with calcium oxide, strontium, barium or mixtures thereof in the amount of 1.0 to 3.5 wt. %.

5. The carrier of the catalyst for purification of exhaust gases from nitrogen oxides catalytic recovery of hydrocarbons in an oxidizing atmosphere containing in its composition modified zirconium dioxide, characterized in that it is a low-temperature cubic modification of zirconium dioxide stabilized with oxides of alkaline earth metals, and oxides of calcium, strontium, barium or mixtures thereof in the amount of 1.0 to 3.5 wt. % with a specific surface area of not less than 160 m2/,

6. The method of preparation of the catalyst carrier for purification of exhaust gases from nitrogen oxides by the catalytic recovery of hydrocarbons in an oxidizing atmosphere by the interaction of the starting components containing zirconium compounds and alkaline earth metals, followed by drying and calcination, wherein it is prepared by adding an aqueous solution of ammonia to a mixed solution of salts of nitric acid circus the gain medium, representing low-temperature cubic modification of zirconium dioxide stabilized with oxides of alkaline earth metals, in an amount of 1.0 to 3.5 wt. % with a value of specific surface area not less than 160 m2/,

7. The method of preparation of the catalyst for purification of exhaust gases from nitrogen oxides by the catalytic recovery of hydrocarbons in an oxidizing atmosphere, characterized in that the catalyst is prepared by fotogaleria to the media, representing the low-temperature modification of zirconium dioxide stabilized with oxides of the transition metal and the noble metal, thus receive the catalyst according to any one of paragraphs. 1-4.

8. The method of preparation of the catalyst for purification of exhaust gases from nitrogen oxides by the catalytic recovery of hydrocarbons in an oxidizing atmosphere, characterized in that the catalyst is prepared by autoclaving salt of the transition metal compound of the noble metal and the carrier constituting the low-temperature cubic modification of zirconium dioxide stabilized with oxides of alkaline earth metals, in an alkaline medium at a temperature of not less than 100oWith get the catalyst subtleties recovery of hydrocarbons in an oxidizing atmosphere, characterized in that the catalyst is prepared by impregnation on capacity salts of transition metals, compounds of the noble metal and the carrier constituting the low-temperature cubic modification of zirconium dioxide stabilized with oxides of alkaline earth metals, you get a catalyst according to any one of paragraphs. 1-4.

10. The method of purification of waste gases from nitrogen oxides by the catalytic recovery of hydrocarbons in an oxidizing atmosphere in the presence of zirconium bearing catalyst at a temperature 240-525o, Characterized in that the use of the catalyst according to any one of paragraphs. 1-9.

11. The method according to p. 10, characterized in that a hydrocarbon is used WITH2-C16the hydrocarbons.

 

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