The method of producing catalyst for the oxidation of carbon monoxide

 

(57) Abstract:

The inventive method of producing catalyst for the oxidation of carbon monoxide comprises a mixture of manganese dioxide and copper oxide with bentonite clay in an amount of 5 to 20 wt.% in the form of an aqueous slurry, molding granules, drying, grinding and heat treatment in fluidized bed when the ratio of the volume of the granules of the catalyst and the volume of gas 1: (3000 - 15000). table 1.

The invention relates to the field of gas purification from impurities and can be used for purification of gas mixtures of carbon monoxide in the systems of collective and individual protection of respiratory organs.

A known method of producing a catalyst for purification of gas mixtures from toxic impurities, in particular carbon monoxide, comprising adding to vibroisolation powder active alumina grade a-1 of a solution of nitrate of copper, a small amount of water to make the mass of plasticity, forming in the auger-the pellet with a diameter of the nozzle 2.0-2.5 mm, the heat treatment of the obtained granules at 280-300aboutC for 3-4 h with subsequent impregnation with a solution of manganese nitrate and re-heat treatment [1]

The disadvantage of this method is difficult and heat-treated granules of the catalyst with a solution of manganese nitrate and subsequent heat treatment.

There is also known a method of producing catalyst for the oxidation of carbon monoxide from the exhaust or flue gases, comprising mixing oxides of manganese, copper and aluminum at a ratio of 7:3:10 dry, then add water for the formation of a pasty mass and its subsidence for a long time with the formation of uniform weight, subsidence last dry, molding, drying the obtained pellets and pyrolysis at a temperature of 500-600aboutC for 1-2 h with complete removal of the water [2]

The disadvantages of this method are the duration of the process of obtaining a uniform mixture of oxides of manganese, copper and aluminum and not enough high catalytic activity of the resulting catalyst in the oxidation of carbon monoxide.

Closest to the proposed technical substance and the number of matching characteristics is the catalyst for oxidation of carbon monoxide, which is produced by mixing manganese dioxide and copper oxide with a binder, which is used as bentonite clay, molding, drying, grinding and heat treatment of the obtained granules [3]

The disadvantage of this catalyst is the low catalytic activity in the oxidation of carbon monoxide.

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This goal is achieved by the proposed method comprising mixing the aqueous suspension of manganese dioxide and copper oxide with a binder, molding granules, drying, grinding and heat treatment.

The difference of the proposed method against known is that the binder bentonite clay in an amount of 5-20 wt. mixed with manganese dioxide and copper oxide in the form of an aqueous suspension, and heat treatment is carried out in a fluidized bed with respect to the volume of granules of the catalyst to the volume of supplied air 1:(3000-15000).

The method is as follows. Mix of manganese dioxide and copper oxide in the form of an aqueous slurry with a binder bentonite clay. The amount of binder (5-20 wt.) is optimal from the point of view of obtaining a mechanically stable pellets of catalyst with high catalytic activity. The resulting paste is formed on the screw granulator at a pressure of 35-45 ATM and a temperature of 100-120aboutC. These granules are dried at a temperature of 60-90aboutC for 10-15 hours, crushed, sieved fraction of 1-3 mm, and conducting heat treatment at 250-370aboutWith respect to the volume of granules of the catalyst to the volume of supplied air 1:(3000-15000). The catalyst composition: manganese dioxide 50-70 wt. the manganese with a humidity of 50% and 40 kg of paste of copper oxide with a humidity of 60% is loaded into the mixer, add 150 l of water, stirred for 1.5 hours From the beginning of stirring 4.8 kg binder (bentonite clay), and the binder content is 5 wt. The resulting suspension was filtered and discharged in a paddle mixer with steam jacket and lead the process of plasticization during 1 h to a moisture content of 30% On the screw granulator is formed into pellets, dried at a temperature of 85aboutC for 12 hours the Dried granules are crushed, sieved fraction of 1-3 mm, and conducting heat treatment in a fluidized bed with air at a temperature of 330aboutAnd the ratio of the volume of catalyst granules and volume of air to 1:10000. The resulting catalyst has the following composition: manganese dioxide 59 wt. the copper oxide 15 wt. binder (bentonite clay) 5 wt. impurities else. Catalytic activity in the oxidation of carbon monoxide was 1,3610-3mol/g

P R I m m e R 2. The process of example 1, except the content of the binder is equal to 20 wt. The resulting catalyst has the following composition: manganese dioxide 50 wt. the copper oxide 13 wt. binder (bentonite clay) 20 wt. impurities else. Catalytic activity in the oxidation of carbon monoxide was 1,2810-3mol/g

P R I m e R 3. The process according to the volume of the supplied air, equal to 1:3000. Obtained catalyst has the following composition: manganese dioxide 55 wt. the copper oxide 14 wt. binder (bentonite clay) 10 wt. impurities else. Catalytic activity in the oxidation of carbon monoxide was 1,3510-3mol/g

P R I m e R 4. The process of example 1, except the content of the binder is equal to 10 wt. The resulting catalyst has a composition, as in example 3. Catalytic activity in the oxidation of carbon monoxide was 1,4210-3mol/g

The results of research of influence of binder content and the ratio of the volume of catalyst granules and volume of air supplied to the catalytic activity shown in the table.

As follows from the data shown in the table, the highest catalytic activity is observed when the binder content of 10 wt. and the ratio of the volume of the granules of the catalyst to the volume of air is 1:10000. When the binder content is less than 5 wt. granules of the catalyst does not have sufficient mechanical strength, when the binder content is higher than 20 wt. there is a decrease of catalytic activity. On the other hand, the catalytic activity decreases when the ratio of the volume of the granules of the catalyst and the volume of powayshenie catalytic activity in the oxidation of carbon monoxide during the process of mixing of manganese dioxide and copper oxide with a binder (bentonite clay) in a water suspension and carrying out heat treatment in a fluidized bed, obviously, due to the fact that, firstly, a mixture of manganese dioxide and copper oxide with a binder (bentonite clay) in aqueous suspension in the amount of 5-20 wt. allows to obtain mechanically strong catalyst pellet at a lower relative content in the binder composition, which is not a carrier of catalytic properties. That is, a reduction in the content of the binder in the composition of the catalyst, due to better binding properties of the binder due to the process of mixing in a water suspension, gives the opportunity to prepare a catalyst containing in its structure a large proportion of the catalytically active components, which are manganese dioxide and copper oxide. Secondly, in the process of conducting heat treatment in fluidized bed fighting granules of the catalyst with each other and, consequently, the formation on their surface characteristic of the microrelief and the development of the external surface of the granules, which largely determines the activity of the catalyst. With a small ratio of the volume of the granules of the catalyst and the amount of supplied air collision granules are rare. With the increase in the ratio of the volume of granules and volume of the STI granules and, as a consequence, to increase catalytic activity. However, with further increase of the ratio of the volume of the granules of the catalyst and the amount of supplied air quantity and the kinetic energy of mutual collisions decreases, this leads to a reduction of the external surface of the granules and to a decrease of catalytic activity. In turn, a mixture of manganese dioxide and copper oxide with a binder in the form of an aqueous suspension allows to achieve a better distribution of the components and contributes to the formation of the maximum number of catalytically active centers. The combination of these features allows to achieve high activity of the catalyst in the oxidation of carbon monoxide.

Thus, the proposed method allows to obtain the catalyst, significantly exceeding known in the oxidation of carbon monoxide.

The METHOD of producing CATALYST for the OXIDATION of CARBON MONOXIDE, comprising a mixture of manganese dioxide and copper oxide with a binder is bentonite clay, molding granules, drying, grinding and heat treatment, characterized in that the manganese dioxide and copper oxide mixed with a binder in an amount of 5 to 20 wt. % in the form of an aqueous suspension and heat treatment are in the fluidized bed when the ratio

 

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