A method of obtaining a low-temperature catalyst for the oxidation of carbon monoxide

 

(57) Abstract:

The invention relates to gas cleaning from impurities and can be used in particular for the purification of gas mixtures of carbon monoxide in the systems of collective and individual protection of respiratory organs, as well as for other industrial and environmental purposes. Low-temperature catalyst for the oxidation of carbon monoxide is produced by mixing manganese dioxide and copper oxide with a binder is bentonite clay. Formed into pellets, dried, crushed and subjected to heat treatment in two stages: first, ordinary air, then air dried at 250 - 290oC. the resulting catalyst is much superior known in the oxidation of carbon monoxide at temperatures below 0oC while maintaining a high level of activity at 20oC. 1 table.

The invention relates to gas cleaning from impurities and can be used in particular for the purification of gas mixtures of carbon monoxide in the systems of collective and individual protection of respiratory organs and the emissions of industrial enterprises, for purification of exhaust gases of internal combustion engines, as well as for other industrial and environmental Calida manganese and copper oxide with a binder - 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 to the volume of gas 1:(3000 - 15000) [1].

The disadvantage of this method is the low catalytic activity of the resulting catalyst in the oxidation of carbon monoxide at temperatures below 0oC.

Closest to the proposed technical substance and the number of matching characteristics is a method for low-temperature 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, which is carried out in a fluidized bed in two stages: first, ordinary air, then air dried to 10 - 100 PP [2].

The disadvantage of this method is the low catalytic activity of the resulting catalyst in the oxidation of carbon monoxide at temperatures above 0oC.

The aim of the invention is to increase the catalytic activity of the catalyst in the oxidation of carbon monoxide at temperatures above 0oC.

The goal is reached the clay, forming granules, drying, grinding and heat treatment carried out in two stages: first, ordinary air, then air dried at 250 - 290oC.

The difference of the proposed method against known is that the heat treatment of the dried air is carried out at 250 to 290oC.

The method is as follows.

Mix of manganese dioxide and copper oxide with a binder is bentonite clay. The resulting paste is formed on the screw granulator. These granules are dried, crushed, sieved fraction 1 - 3 mm, and conducting heat treatment in two stages: first, ordinary air, then air dried at 250 - 290oC.

Example 1. Take 1.5 kg of a paste of manganese dioxide with a humidity of 50% and 0.4 kg of a paste of copper oxide with a humidity of 60%, is loaded into the mixer, add 3 l of water and stirred for 1 h At the beginning of the mixing, add 0.1 kg of the binder is bentonite clay. After mixing, the suspension was filtered and discharged in a paddle mixer with steam jacket and lead the process of plasticization pasta for 10 minutes to a moisture content of 30%. On screw granulator is formed into pellets, dried at 70oC for 6 hours the Dried granules are crushed, sieved fraction 1 - 3 250 mmoC. the resulting catalyst has the following composition, wt.: manganese dioxide 68%; copper oxide 15%, the binder is bentonite clay, impurities else. Catalytic activity in the oxidation of carbon monoxide was 4.07 mmol/g at -10oC and 1041 mmol/g at 20oC.

Example 2. A process as in example 1 except that heat treatment temperature, which amounted to 270oC. Catalytic activity in the oxidation of carbon monoxide amounted to 4.01 mmol/g at -10oC and of 1.33 mmol/g at 20oC.

Example 3. A process as in example 1 except that heat treatment temperature, which amounted to 290oC. Catalytic activity in the oxidation of carbon monoxide was 4,12 mmol/g at -10oC and 1.29 mmol at 20oC.

The results of research of influence of heat treatment temperature on the catalytic activity in the oxidation of carbon monoxide in the table.

Catalytic activity (A) was calculated by the formula

< / BR>
where

v is the specific speed gas flow, 0,32 l/min cm2;

the time of occurrence for the catalyst layer of oxide of carbon with a concentration of 0.1 Cabout;

Cabout- initial concentration of carbon monoxide, 6,2 what I mass of carbon monoxide, 28 g/mol.

As follows from the data shown in the table, the highest catalytic activity of the catalyst in the oxidation of carbon monoxide at temperatures above 0oC is observed in the case of carrying out heat treatment at 250 to 290oC. lowering the temperature of the heat treatment is less than 250oC or an increase of more than 290oC leads to a noticeable decrease in catalytic activity at temperatures above 0oC. When the temperature of heat treatment is less than 250oC catalytic activity at temperatures below 0oC also decreases, however, with increasing heat treatment temperature of more than 290oC a pronounced trend towards the reduction of catalytic activity at temperatures below 0oC is not observed.

The essence of the proposed method is as follows.

The increase of catalytic activity of the catalyst in the oxidation of carbon monoxide at temperatures above 0oC when carrying out the heat treatment at 250 to 290oC is likely to be due to the following reasons. It is known that water is a catalytic poison for oxide-manganese systems in the oxidation of carbon monoxide, and therefore, when performing heat treatment at a temperature of no what about the potential of the catalyst and reduction of catalytic activity in the oxidation of carbon monoxide. On the other hand, when performing heat treatment at temperatures above 290oC may begin the process of restructuring the active centers of the catalyst, resulting in their partial decontamination and as a consequence the decrease of catalytic activity in the oxidation of carbon monoxide.

Thus, the proposed method allows to obtain the catalyst, far beyond the known oxidation of carbon monoxide at temperatures above 0oC.

From the above it follows that each of the signs proposed aggregate to a greater or lesser extent affect the achievement of the goal; to increase the catalytic activity of the catalyst in the oxidation of carbon monoxide at temperatures above 0oC, and the entirety is sufficient to characterize the proposed technical solutions.

A method of obtaining a low-temperature 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 carried out in two stages - first ordinary air, then dried air, characterized in that the Ter is

 

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FIELD: oxidation catalysts.

SUBSTANCE: invention relates to oxidation catalysts that can be, in particular, used for complete oxidation of volatile organic compounds into CO2 and H2O. Catalyst according to invention contains mixed copper, manganese, and lanthanum oxides, wherein metals can assume multiple oxidation states and whose chemical analysis expressed for metals in lowest oxidation states is the following: 35-40% CuO, 50-60% MnO, and 2-15% La2O3.

EFFECT: enhanced stable catalytic activity and resistance to caking.

11 cl, 2 tbl, 2 ex

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