A method of producing a catalyst for purification of gas from organic substances and carbon monoxide

 

(57) Abstract:

The invention relates to the refining, chemical, thermal power and other industries and can be used for sanitary thermal purification of low-pressure oxygen-containing gases from harmful impurities, for example, exhaust gases oxidative regeneration of catalysts and adsorbents. The invention solves the problem of increasing the service life of the catalyst by increasing the mechanical strength, thermal stability and catalytic activity in the absence of environmental pollution in the process of preparation of the catalyst. The invention consists in the fact that to obtain a catalyst for gas purification from organic compounds and carbon monoxide by coating porous media catalytically active suspension, comprising a catalytically active component and the binder component in the form of a solution of the adhesive, followed by drying and calcining the catalyst coating as a binder component using a saturated aqueous solution alumacraft ligament when the mass ratio of the catalytically active component and the aqueous binder solution bundles(3:1) - (5:1) and the ratio compl.

The invention relates to the refining, chemical, thermal power and other industries and can be used for sanitary thermo catalytic purification of exhaust low-pressure oxygen-containing gases from harmful impurities, for example, exhaust gases oxidative regeneration of catalysts and adsorbents.

A known method of producing the catalyst applied to the surface of the carrier catalytically active particles by pushing the catalytically active particles with hardness lower the hardness of the media using rolls [1] However, the known method is characterized by a significant waste of catalytically active substances in the process of their application and the need for additional costly inert hard and soft particles, in particular silver, gold, platinum or their alloys.

A known method of producing catalyst on porous metal media by bombarding it with a stream of ions of Cu+, Cr+and others with sufficient energy for the introduction of ions into the surface of the medium and formation of active centers [2] the Known method is technically complicated in its implementation to obtain industrial parties catalizadores carrier solution of nitrate and aluminum nitrate beryllium [3] the Disadvantage of low mechanical strength of the coating media catalytically active substances because of their weak adhesion.

The closest in technical essence to the invention is a method of producing the catalyst by coating non-porous metal media catalytically active suspension, comprising a catalytically active component (oxide managability catalyst) and the binder component in the form of a solution of an adhesive (a mixture of calcium aluminate and 28 of 40% solution of polymethylphenyl siloxane resin in toluene), followed by drying and calcining the catalyst coating [4] However, having a high mechanical strength at 200 400oC, the catalyst obtained according to the method quickly loses strength properties and is destroyed by breaking bonds in polymethylphenylsiloxane resin at 400 800oC, observed in particular when cleaning volley emissions of harmful impurities due to overheating of the catalyst in the selection of the heat of combustion of a large mass of organic substances in waste: shattered catalyst coating is carried away by the flow of the purified gas from the surface of the metal carrier, which leads to a sharp decrease in the efficiency of operation of the reactor, in addition due to significant diffusion resistance of the catalyst layer, the catalyst has a low ka is the mass of the suspension leads to environmental pollution pairs of toluene in the process of drying and calcining the catalyst coating, in addition, due to the chemical interaction of polymethylphenyl siloxane resin with oxide catalysts during calcination and at the initial stage of operation of the catalyst may be a selection of benzene, also pollute the environment.

The invention solves the problem of increasing the service life of the catalyst by increasing the mechanical strength, thermal stability and catalytic activity without environmental pollution in the process of obtaining by coating non-porous metal media catalytically active suspension, comprising a catalytically active component and the binder component in the form of a solution of the adhesive, followed by drying and calcining the catalyst coating, using as a binder component of a saturated aqueous solution alumacraft ligament when the mass ratio of the catalytically active component and the aqueous binder solution(3:1) (5:1) and the mixing ratio of binder solution of Al2O3Cr2O3P2O51 (1 0,5) (2 4). Use as components of the catalyst coating of non-volatile inorganic components and excludes water pollution and makes the process of polychemistry, due to the effective adhesion alumacraft ligaments, increases the catalytic activity of the catalyst coating, in addition, Cr2O3that is part of the binder solution, is also a catalyst for the oxidation of organic compounds to CO2and H2ABOUT:

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what further enhances the catalytic activity of the coating. The recommended mixing ratio of binder solution eliminates the allocation of the crystalline phase of the binder solution at the stage of formation of the catalyst coating, which increases the uniformity and mechanical strength. To improve the mechanical strength and thermal stability of the catalyst coating also contributes to the lack of thermodestruction components included in the composition of the catalyst. Use as a catalytically active component mixture comprising oxides of chromium, copper and barium with a particle size less than 0.1 mm allows you to get cheap and homogeneous catalyst coating in the form of a thin mechanically strong film on the surface of the metal carrier with simultaneous intensifitsirovany process of oxidation of organic compounds and carbon monoxide.

It is also a thin layer of fine high-performance aluminium oxide-platinum catalyst with a particle size less than 0.01 mm to wet the surface of the catalyst coating during drying, which allows to minimize the consumption of expensive aluminium oxide-platinum catalyst to significantly improve the catalytic activity of the catalyst coating.

Performing calcining a metal carrier coated with a catalyst coating in the heating mode up to 300 400oC with a heating rate of 3 to 5oC/min to 150oC with heating rate 5 10oC/min to 150 (300 400)oC, followed by curing at 300 400oC for at least 3 h allows you to delete the crystallographic analysis-hydrated water from the catalyst without blistering of the coating and to maintain its homogeneity, which increases the mechanical strength of the catalyst and the life.

A method of producing a catalyst for purification of gas from organic and carbon monoxide Ossetia in the ratio(3:1) (5;1) the catalytically active component (the mixture of catalyst, containing the oxides of chromium, copper, barium, less than 0.1 mm after sieving through a sieve with openings of 0.1 mm) and a binder component, a saturated aqueous solution alumacraft bundles with mixing ratio of binder solution of Al2O3Cr2O3P2O5equal 1: (1 0,5) (2 4). Catalytically active suspension is applied on a previously fat-free non-porous metal media, such as a steel plate, by means of a brush or spray a layer thickness of 0.2 to 0.3 mm. Media catalyst coating being dried for 24 h at 20 25oC in an atmosphere of moist air with a relative humidity of 80 to 90% in the drying chamber, then calcining in a muffle furnace at 400oC for 4 h Cooling thermostable carrier to the temperature of the environment jointly with muffle oven in the free cooling mode is disabled furnace.

Examples 1 to 9. To assess the mechanical strength of the catalyst is carried out applying the catalytically active suspension consisting of a mixture comprising oxides of chromium, copper and barium, and the binder component in the ratios shown in table.1, on a steel plate with a length of 140 mm, a width of 10 mm and a thickness of 0.5 mm Thickness and calcination at 400oC in a muffle furnace for 4 h, cooled plate coated with a catalyst coating experience on the mechanical strength of the catalyst under the influence of the mechanical deformation in bending of plates. During testing were recorded minimum radius of bending of plates with their deformation, which maintains the integrity of the catalyst coating the absence of cracks in the catalytic film, peeling or shedding catalytic film on the surface of the metal carrier. The smaller value the allowable minimum bend radius of the plate, the higher the mechanical strength of the catalyst, because it increases the strength of its connection with the surface of the carrier and the higher the lifetime of the catalyst in real terms (table.1).

Examples 10-21. To assess thermal stability of the catalyst experiments were conducted similarly to examples 1 to 9 by calcining in a muffle furnace plates with a catalyst coating for 4 h at 600 800oC simulating thermal shock when the catalyst by determining the minimum bend radius of the plate during deformation, which maintains the integrity of the catalyst. In table.2 shows the results of the experiments.

Examples 22 to 25. Visual oceancity are given in table. 3.

Tested catalysts deposited on plate module height 120 mm with the distance between the plates of the module stainless steel 10 mm in the oxidation process vapor paraffin solvent-BR-2 in steam-air environment in a laboratory reactor heated to assess the catalytic activity of the catalyst. The flow rate of the vapor mixture in the reactor is 0.6 m3/h, the vapor concentration of BR-2 in steam-air mixture 200 500 mg/m3. The catalyst activity was evaluated according to the degree of purification of steam-air mixture in the temperature range 200 600oC. Catalytically active suspension is deposited on the plate module with a total surface 660 cm2analogously to examples 1 to 9. The duration of the catalyst 15 20 o'clock

Examples 26 to 30. Evaluation of the activity of the catalysts was carried out for three variants of catalysts of different compositions catalytically active suspension. The results are given in table.4.

The catalyst for the purification of gas from harmful impurities organic substances and carbon monoxide obtained by the proposed method can be used in the catalytic cracking when the exhaust gas cleaning catalyst regeneration, dimauro high-temperature combustion of fuel.

Industrial application of catalyst will clean low-pressure oxygen-containing gases from the impurities of organic substances and carbon dioxide to the level of treatment 100% without the use of additional devices such as energy-intensive blowers. In addition, in the process of preparation of the catalyst in the absence of toxic substances there is no pollution of the environment while improving the mechanical strength, thermal stability and catalytic activity.

Sources of information

1. Auth.St. USSR N 585801, CL 01 J 37/02, BI N 47, 1977.

2. The UK patent N 1436558, CL 01 J 37/34, IL N 12, 1976.

3. Auth.St. USSR N 164582, CL 01 J, BI N 16, 1964.

4. Auth.St. USSR N 1181704, CL 01 J 37/02, BI N 36, 1985 (prototype).

1. A method of producing a catalyst for purification of gas from organic substances and carbon oxide by coating non-porous metal media catalytically active suspension, comprising a catalytically active component and the binder component in the form of a solution of the adhesive, followed by drying and calcining the catalyst coating, characterized in that, as a binder component using a saturated aqueous solution alumacraft link NII component binder solution of Al2O3Cr2O3P2O51:1-0,5:2-4.

2. The method according to p. 1, characterized in that the catalytically active component uses a mixture comprising oxides of chromium, copper and barium, with a particle size of not less than 0.1 mm

3. The method according to PP. 1 and 2, characterized in that the drying of the catalyst coating is carried out at 20 25oC and a relative humidity of 80 - 90% within 24 hours

4. The method according to PP. 1 to 3, characterized in that the drying of the catalyst coating on its wet surface a thin layer of fine, highly active aluminium oxide-platinum catalyst with a particle size less than 0.01 mm

5. The method according to PP.1 to 4, characterized in that the calcining a metal carrier coated with a catalyst coating is performed in the heating mode up to 300-400oWith speeds of 3 to 5 deg/min to 150oC with heating rate 5 10 deg/min at 150 (300 400)oC, followed by curing at 300 400oWith at least 3 h, followed by natural cooling in conjunction with the device calcination.

 

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4 dwg, 1 tbl, 2 ex

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