Catalyst and system for exhaust gas treatment

FIELD: process engineering.

SUBSTANCE: proposed catalyst allows catalytic removal of nitrogen oxides in using ammonia as reducing agent, on decomposing and removing unreacted ammonia containing porous basic catalyst material. The latter contains titanium oxide and at least one compound selected from the group consisting of vanadium oxides, tungsten oxides and molybdenum oxides, and cover layer formed on the surface of said basic catalyst material and comprising platinum applied on titanium oxide. Proposed system catalytically removes nitrogen oxides from exhaust gas by using ammonia as reducing agent with simultaneous decomposition and removal of unreacted ammonia wherein denitrating catalyst DeNOx is located uprteam of gas flow, while above described exhaust gas catalyst is located downstream of catalyst DeNOx.

EFFECT: reduced leaks of ammonia, efficient removal of nitrogen oxides and reduced cover layer thickness.

5 cl, 1 tbl, 4 ex

 

The technical field

The present invention relates to a catalyst for treatment of exhaust gas and to the system for processing exhaust gas.

The level of technology

The purpose of generirovaniya exhaust gas as a reducing agent for the decomposition of nitrogen oxides (NOx) to nitrogen (N2) and water vapor (H2O) using ammonia (NH3). In this reaction generirovaniya to improve the responsiveness and efficiency of the reaction using the catalyst DeNOx(generirovaniya). To increase the speed of decomposition of NOxit is only necessary when adding NH3to increase the molar ratio of NH3/NOx. However, if the molar ratio of NH3/NOxexcessively increased, unreacted ammonia can be admixed to the exhaust gas. Once in the atmosphere, forming thus the exhaust gas due to a leak of ammonia to create secondary pollution, etc.

For this purpose, known for purifying exhaust gas, the catalyst having a catalytic layer for oxidation of unreacted ammonia, of the type which is disclosed in JP 3436567 Century

This purifying exhaust gas, the catalyst layer contains catalyst DeNOxa thickness of approximately 0.5 mm formed using emulsion catalyst DeNOx. This layer is essential to ensuring that the PE the work of generirovaniya. However, the thickening layer of the catalyst DeNOxincreases the pressure drop, which impairs the efficiency of the installation. Another reason for the thickening of the layer of catalyst DeNOxis that the layer of the catalyst carrier can not be used as a purifying exhaust gas catalyst.

Disclosure of inventions

The problem that should be solved by the invention

The present invention is made taking into account the situation described above. The aim of the present invention is to provide a catalyst for treatment of exhaust gas and system for processing an exhaust gas, can reduce the degree of leakage of ammonia, while maintaining sufficient removal efficiency of NOxincluding basic catalyst material and the covering layer, where the specified coating layer has a reduced thickness compared to the thickness of the base catalyst material.

Part of the solution

To achieve this goal a distinctive feature of the present invention may be a catalyst for treatment of exhaust gas, capable of catalytically removed from the exhaust gas nitrogen oxides using ammonia as a reducing agent, decomposing and removing the unreacted ammonia and the catalyst includes a porous base catalyst material containing titanium oxide and Myung is our least one connection selected from the group consisting of oxides of vanadium (V), tungsten (W) and oxides of molybdenum (Mo); and a coating layer formed on the surface of the porous base catalyst material, and the specified coating layer contains platinum dioxide based on the media.

In one of its aspects the present invention may be a catalyst for treatment of exhaust gas, capable of catalytically removed from the exhaust gas nitrogen oxides using ammonia as a reducing agent, decomposing and removing the unreacted ammonia, which (catalyst) prepared by mixing a first catalyst slurry mixture containing platinum deposited on the titanium oxide, the second catalyst slurry mixture, prepared from titanium oxide and at least one compound selected from the group consisting of oxides of vanadium (V), tungsten (W) and oxides of molybdenum (Mo)to form a slurry mixture, and subsequent application of the suspension of the mixture on the surface of the porous base catalyst material.

Preferably, the covering layer contains platinum in an amount of from 0.05 to 0.1 wt.% in the calculation of the total amount of titanium oxide and platinum (Pt)contained in the coating layer.

The catalyst for the creation is otci exhaust gas according to the present invention, the thickness of the coating layer can mainly be from 100 to 300 μm.

In one of the preferred embodiments of the catalyst for treatment of exhaust gas according to the present invention platinum in the coating layer can be isolated from the oxides of vanadium.

In another of its aspects, the present invention may provide a system for processing an exhaust gas, capable of catalytically removed from the exhaust gas nitrogen oxides using ammonia as a reducing agent, decomposing and removing the unreacted ammonia, which (system) catalyst DeNOxposted by-side above the gas stream and the catalyst for treatment of exhaust gas of the present invention is placed downstream from the catalyst DeNOx.

The effect of the invention

The present invention provides a catalyst for treatment of exhaust gas and system for processing exhaust gas having a coating layer with a reduced thickness compared to the thickness of the base catalyst material and a reduced degree of leakage of ammonia while maintaining adequate effectiveness of the removal of NOx.

The best way of carrying out the invention

The catalyst for treatment of exhaust gas and system for processing an exhaust gas according to the present invention will hereinafter be described in more detail with reference to variants of their Khujand is the implementation.

Porous base catalyst material

In the catalyst for treatment of exhaust gas according to the present invention as a base material is porous base catalyst material. Porous base catalyst material is mostly porous cellular base catalyst material.

More specifically, the porous base catalyst material is obtained using as starting materials of titanium oxide and at least one compound selected from oxides of vanadium (V), tungsten (W) and oxides of molybdenum (Mo).

Typically, the raw materials mixed mainly in the atomic ratio V/W/Ti, component (0.1-0.6)/(3 to 9)/(70 to 80), or when the atomic ratio V/Mo/Ti, component (0.1-0.6)/(3 to 9)/(70 to 80).

Base material containing component of the catalyst DeNOxprepare, for example, using the following operations: adding aqueous ammonia to the suspension metatitanate acid; adding a given quantity of powder parabolicamara ammonium; kneading the resulting mixture; drying and calcination kneaded mass with the formation of the catalyst powder; applying the obtained catalyst powder and, if necessary, additional pressing in a kneading machine, kneading is received from the mixture together with an adequate amount of water; the extrusion of the mass; drying and subsequent calcination of the extrudate. Thus obtained base material preferably modify so that it had a pore volume of from 0.25 to 0.40 g/cm3.

Porous base catalyst material serves as a catalyst DeNOxfor decomposition as oxides of nitrogen (NOx)originating from the exhaust gas, and oxides of nitrogen formed during the decomposition of ammonia.

In the catalyst for treatment of exhaust gas according to the present invention the porous base catalyst material serves as a catalyst DeNOx. As it decomposes unreacted ammonia decomposing at the same time, formed during the decomposition of ammonia oxides of nitrogen (NOx), he does not lose denariusa efficiency.

The covering layer containing the titanium oxide coated with a platinum

In the catalyst for treatment of exhaust gas according to the present invention, the covering layer is formed on a prepared as described above porous base catalyst material. This coating layer contains titanium oxide coated with a platinum.

The covering layer can be formed as a single layer containing titanium oxide coated with a platinum as oxidizing ammonia catalyst, and the catalyst DNO x.

The method of preparation of the catalyst having a coating layer, for processing exhaust gas

The covering layer is produced by preparing catalyst slurry, applying it to a porous base catalyst material and the calcination of the obtained material. Below is one example of this method.

In one embodiment, the implementation of this method, spherical titanium oxide (having a diameter of from 2 to 4 mm) impregnated in an aqueous solution containing platinum, such as an aqueous solution of platinum chloride (H2PtCl6), to form a coating layer is from 0.05 to 0.1 weight % Pt on spherical titanium oxide. Obtained after drying the titanium oxide calcined at 3-5 hours at a temperature of from 450 to 500°C, resulting in a gain powder catalyst 1. To the obtained powder catalyst 1 add water and subjected to grinding in a wet ball mill, obtaining a catalyst slurry 1 (catalyst suspension to oxidize ammonia).

Similarly, water is added to powdered catalyst 2 obtained by mixing at least one compound selected from the oxides of vanadium, tungsten and oxides of molybdenum, titanium oxide, and grinding the mixture on a wet ball mill, resulting in a gain of a catalyst suspension of 2 (is Uspenskiy catalyst DeNO x). In this case, it is preferable to mix the oxides at the atomic ratio V/W/Ti equal to (0.1-0.6)/(3 to 9)/(70 to 80), or when the atomic ratio V/Mo/Ti equal to (0.1-0.6)/(3 to 9)/(70 to 80).

The catalyst suspension 3 is prepared by mixing from 30 to 40 weight. parts of the catalyst slurry 1 and from 60 to 70 weight. parts of the catalyst suspension 2, each of which is brought to the same concentration of the suspension.

Porous base catalyst material, for example porous cellular base catalyst material impregnated in the catalyst suspension 3. Obtained after drying, the catalyst was calcined in air for 3-5 hours at a temperature of from 450 to 500°C. the Catalyst suspension 3 is applied to the surface of the base material in an amount of from 85 to 115 g (the thickness of a coating layer from 85 to 115 µm) for 1 m2the surface area of the base material. Thus obtained bifunctional catalyst is a catalyst for treatment of exhaust gas, having a porous base catalyst material coating layer consisting of a single layer containing titanium oxide coated with a platinum, i.e. a catalyst for the oxidation of ammonia and the catalyst DeNOx.

If the covering layer is performed as described above, from a single layer, to enhance the catalytic activity of platinum against oxidation and Miaka, it is preferable to isolate platinum oxides of vanadium.

The catalyst for treatment of exhaust gas according to the present invention acts as a catalyst for the catalytic removal from exhaust gas of nitrogen oxides using ammonia as a reducing agent in the process of which the catalyst also decomposes and removes unreacted ammonia. In short, the catalyst performs the reaction generirovaniya and oxidative decomposition of ammonia, as described below.

The reaction generirovaniya

The reaction of the oxidative decomposition of ammonia

The catalyst for treatment of exhaust gas according to the present invention can be used in the treatment system exhaust gas. Such a system for exhaust gas processing is a processing system for catalytic exhaust gas removal from exhaust gas of nitrogen oxides using ammonia as a reducing agent while decomposition and removal of unreacted ammonia. In one of its specific variants of the system for processing exhaust gas can be performed by placing the catalyst DeNOxon the side above the gas stream and the subsequent size is a communication catalyst for treatment of exhaust gas according to the present invention downstream of the catalyst DeNO x.

Such a system for handling exhaust gas has the advantage that reduce leakage NH3compared with what takes place when using only one catalyst DeNOx.

Example 1

Spherical titanium oxide (having a diameter of from 2 to 4 mm) impregnated in an aqueous solution of platinum chloride (H2PtCl6with the aim of application of 0.05 wt.% platinum (Pt) on the spherical titanium oxide. Obtained after drying the titanium oxide calcined for 5 hours at 500°C, resulting in a gain powder catalyst 1. To the obtained powder catalyst 1 (the catalyst for the oxidation of ammonia) add water, then grind in a wet ball mill, obtaining a catalyst slurry 1. Similarly, water is added to powdered catalyst 2 (catalyst DeNOx), consisting of 0.6 wt.% oxides of vanadium, 9 wt.% tungsten and 80 wt.% titanium oxide, after which the resulting mixture is ground in a wet ball mill, obtaining a catalyst slurry 2.

The catalyst suspension 3 is prepared by mixing 35 weight. parts of the catalyst slurry 1 and 65 weight. parts of the catalyst suspension 2, each of which is brought to the same concentration of the suspension. Porous cellular base catalyst material (acting as the catalyst DeNOx), Slu is ASI as a porous base catalyst material and comprising 0.6 weight. parts of the oxides of vanadium, 9 wt.% tungsten and 80 wt.% titanium oxide, impregnated in the catalyst suspension 3. The resulting catalyst is dried and then calcined for 5 hours at 500°C.

The catalyst suspension 3 is applied on the base material in the amount of 100 g (the thickness of a cover layer about 100 μm) for 1 m2the surface area of the base material and the resulting cell catalyst for treatment of exhaust gas is designated as a bifunctional catalyst 1.

Example 2

Bifunctional catalyst 2 obtained just as the obtained bifunctional catalyst 1, except that the amount of deposited platinum (Pt) changed to 0.1 wt.%.

Comparative example 1

The catalyst DeNOxwith TiO2-V2O5-WO3(the mass ratio of TiO2/V2About5/WO3=80:0,6:9) was prepared as follows.

To 3600 g of the suspension metatitanate acid (with a content of Tio230 wt.%) add aqueous ammonia content of NH325% to adjust the pH to 6.5. To the obtained mixture powder parabolicamara ammonium to bring content WO39 wt.% and thus obtained mixture is subjected to wet mixing for 2 hours. The resulting mass is dried and then calcined for 5 hours at 550°C, obtaining a powder composed of titanium oxide and tungsten oxide is. To the obtained powder add an aqueous solution of metavanadate ammonium content V2O50.6 wt.%. The resulting mixture was thoroughly mixed, dried and calcined for 4 hours at 450°C, receiving the powder (A)consisting of a titanium oxide (TiO2), vanadium oxide (V2O5) and tungsten oxide (WO3). In the kneading machine load 1000 g of the powder (A), 25 g of carboxymethyl cellulose and 12.5 g of polyethylene oxide. Add to the mixture the right amount of water and knead for 30 min Obtained kneaded mass ekstragiruyut with the formation of the sheet size of 50 mm2that is dried and then calcined for 5 hours at 500°C.

Comparative example 2

Prepare the catalyst as example 1, except for using instead of the aqueous solution of chloride of platinum (H2PtCl6) an aqueous solution of palladium chloride.

Made on the test performance of bifunctional catalysts 1, 2 and 5 and catalyst DeNOx.

Test performance was produced under the following conditions:

Exhaust gas temperature: 380°C

The flow rate of the exhaust gas is 2.3 nm/s

The concentration of NOx: 500 ppm

The results are shown in table 1

Table 1
CatalystTemperature (°C)Performance of catalyst
The effectiveness of generirovaniya, %The concentration of leakage NH3(h/m)
Example 1Bifunctional catalyst 1380952
Example 2Bifunctional catalyst 2380953
Comparative example 1The catalyst DeNOx380958
Comparative example 2Bifunctional catalyst 5380958

A catalyst for treatment of exhaust gas according to the present invention allows to reduce the concentration of leakage of ammonia while efficiency generirovaniya 95%, and can reduce the thickness p of the blood layer.

1. The catalyst for treatment of exhaust gas, capable of catalytically removed from the exhaust gas nitrogen oxides using ammonia as a reducing agent, decomposing and removing the unreacted ammonia, which contains
porous base catalyst material containing titanium oxide and at least one compound selected from the group consisting of oxides of vanadium (V), tungsten (W) and oxides of molybdenum (Mo); and a coating layer formed on the surface of the porous base catalyst material, and the specified coating layer contains platinum coated on the titanium oxide.

2. The catalyst for treatment of exhaust gas according to claim 1, obtained by mixing a first catalyst slurry containing platinum deposited on the titanium oxide, the second catalyst suspension prepared from titanium oxide and at least one compound selected from the group consisting of oxides of vanadium (V), tungsten (W) and oxides of molybdenum (Mo)to form a slurry mixture, and then applying this suspension of the mixture on the surface of the porous base catalyst material.

3. The catalyst for treatment of exhaust gas according to claim 1 or 2, wherein the covering layer contains platinum in an amount of from 0.05 to 0.1 wt.% in calculating the total number is xida titanium and platinum (Pt), contained in the coating layer.

4. The catalyst for treatment of exhaust gas of claim 1, wherein the covering layer has a thickness of from 100 to 300 mm.

5. System for treatment of exhaust gas, capable of catalytically removed from the exhaust gas nitrogen oxides using ammonia as a reducing agent, decomposing and removing the unreacted ammonia, in which the catalyst DeNOx(denitration) is located upstream of the gas, and the catalyst for treatment of exhaust gas according to any one of claims 1 to 4 is located downstream from the catalyst DeNOx.



 

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25 cl, 3 ex, 8 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to catalysts for preparing petroleum fractions with low content of sulphur and nitrogen, methods of preparing such catalysts and processes for hydrofining hydrocarbon material. The invention describes a catalyst for hydrofining hydrocarbon material, having pore volume of 0.3-0.7 ml/g, specific surface area of 200-350 m2/g and average pore diametre of 9-13 nm, and containing a boron compound and a bimetallic complex compound [M(H2O)x(L)y]2[Mo4O11(C6H5O7)2], where: M=Co2+ and/or Ni2+; L is a partially deprotonated form of citric acid C6H8O7; x=0 or 2; y=0 or 1; - 30-45 wt %, a boron compound in amount of 1.06-3.95 wt %, Al2O3 -51.05-68.94 wt %, which corresponds to the following content in a catalyst annealed at 550°C, wt %: MoO3 - 14.0-23.0; CoO and/or NiO - 3.6-6.0; B2O3 -0.6-2.6 Al2O3 - the rest. The catalyst is prepared through saturation of aluminium oxide with a pre-synthesised solution of a bimetallic complex compound [M(H2O)x(L)y]2[Mo4O11(C6H5O7)2] and a boron compound, wherein concentration of the bimetallic compound in the solution provides 40-45 wt % bimetallic complex compound in the ready catalyst. The process of hydrofining hydrocarbon material is carried out at temperature 320-400°C, pressure 0.5-10 MPa, weight flow rate of material of 0.5-5 h-1, volume ratio hydrogen/material equal to 100-1000 m3/m3 in the presence of the catalyst described above.

EFFECT: maximum catalyst activity in target reactions taking place when hydrofining hydrocarbon material, which ensures obtaining petroleum products with low residual content of sulphur.

8 cl, 8 ex, 2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to catalytic chemistry, specifically to catalysts for oxidation of hydrocarbons in an oxygen-containing gas and methods of preparing said catalysts. The invention describes a catalyst for oxidising hydrocarbons, which contains an active component - manganese oxide and a support in form of granular zirconium oxide with the following content of components, wt %: manganese oxide (MnO2) 5.0-20.0; zirconium oxide (ZrO2) 80.0-95.0. Described also is a catalyst which contains manganese oxide and a granular support made from powdered aluminium oxide in a mixture with crystalline mesoporous aluminium silicate with molar ratio Si/Al equal to 10-60:1, with the following ratio of components, wt %: manganese oxide (MnO2) 5.0-20.0; aluminium oxide (Al2O3) 40.0-85.0; crystalline mesoporous aluminium silicate (AlxSiyOz, where x=0.017-0.1, y=1, z=2.026-2.15) 10.0-40.0. The invention describes a method of preparing catalysts (versions) described above, involving preparation of a support - zirconium oxide or granular mixture of powdered aluminium oxide and crystalline mesoporous aluminium silicate and depositing onto the support manganese oxide, obtained through calcination at 500-600°C of the support saturated with aqueous manganese hydroxide solution after drying in an a temperature interval from 60 to 110°C.

EFFECT: higher catalytic activity and life of the catalyst.

6 cl, 1 tbl, 6 ex

FIELD: chemistry.

SUBSTANCE: invention relates to catalysed production in oil-refining and petrochemical industry and can be used to prepare a catalyst for isomerisation of light gasoline fractions. The invention describes a method of preparing an oxide catalyst for isomerisation of light gasoline fractions which contains a hydrogenating-dehydrogenating component and a support made through treatment in an alkaline medium of a mixture of hydroxides of zirconium, tungsten, aluminium, titanium and manganese at pH 9-11, temperature of 60-100°C for 10-24 hours, washing with water in ratio of water: hydroxides equal to 100-300, filtration, drying the support at 100-150°C for 10-20 hours and calcination in a current of dry air at 650-850°C for 3-5 hours and then deposition of the hydrogenating-dehydrogenating component and thermal treatment of the catalyst.

EFFECT: higher specific surface area of the catalyst, total pore volume and activity during isomerisation of C7-C8 paraffin hydrocarbons.

1 cl, 1 tbl, 12 ex

FIELD: chemistry.

SUBSTANCE: invention relates to sorption techniques, particularly for preparing sorbent-catalysts used as organic synthesis catalysts when treating vodka in order to convert organic impurities in the vodka to high-molecular weight compounds which give the beverage good taste. The invention describes a method of preparing the sorbent-catalyst, involving saturation of active carbon, having ratio of volume of sorption space to total pore volume equal to 0.45-0.55 with 0.01-0.20 wt % palladium (II) chloride, maturation of the saturated carbon for 6-10 hours, reduction of palladium (II) to palladium metal with a sodium formate solution heated to 80-90°C and taken in ratio carbon: solution equal to 1: (4-5).

EFFECT: method of preparing sorbent-catalysts increases content of acetyl acetate in vodka classifications to 0,67 mg/dm3, which improves quality of the vodka and enables to attain a taste mark of 9,50.

3 cl, 3 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of preparing a catalyst or procatalyst suitable for use in production of alkenylalkanoates, to a catalyst composition for production of alkenylalkanoates and to a method of producing alkenylalkanoates. The invention describes a method of preparing a catalyst or procatalyst which involves bringing at least one solution of a catalyst component precursor which contains palladium or gold into contact with support material, where at least one solution of the catalyst component precursor is an aqueous solution which contains one or more of Pd(NH3)2(NO2)3, Pd(NH3)4(OH)2, Pd(NH3)4(NO3)2, Pd(NH3)4(OAc)2, Pd(NH3)2(OAc)2, Pd(NH3)4(HCO3)2) and of NaAuO2, KAuO2, NMe4AuO2 and HAu(NO3)4 in nitric acid or their combinations and reduction of palladiuim or gold when the reducing medium is brought into contact with the support material. The invention describes a catalyst composition which contains support material containing at least palladium and gold which is brought into contact with the support material to obtain a catalyst or procatalyst using the method described above. Described also is a method of producing alkenylalkanoates which involves bringing starting material which contains alkene, alkanoic acid and oxidising agent into contact with a catalyst or procatalyst described above.

EFFECT: reduced amount of by-products and more efficient production of alkenylalkanoates.

32 cl, 6 tbl, 15 ex

FIELD: chemistry.

SUBSTANCE: invention concerns application of chrome source as catalyst activator in combination with precipitated iron catalyst in high-temperature Fischer-Tropsch process for transformation of CO and H2 reagents into reaction products in the form of hydrocarbons and possible hydrocarbon oxygenates by contacting CO and H2 with chrome source combined with precipitated iron catalyst in the course of two-phase high-temperature Fischer-Tropsch reaction. Reaction is performed in reactor with fluidised layer, reactants and reaction products are in gas phase, and catalyst is in solid phase. Chrome source concentration in precipitated iron catalyst comprises 0.3-1 g of chrome per 100 g of iron. Beside chrome source, precipitated iron catalyst includes at least one additional catalyst activator. Also invention claims two-phase high-temperature Fischer-Tropsch process.

EFFECT: enhanced catalyst activity, reduced organic acid formation and methane concentration.

12 cl, 1 tbl

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