The method of producing catalyst

 

(57) Abstract:

The invention relates to the field of inorganic chemistry and can be used in particular for the preparation of the catalyst used for the decomposition of harmful pollutants, such as ozone, in productions with his participation, namely, water treatment, wastewater treatment, processing of semiconductors in the electronics industry, sterilization in medicine and disinfection in agriculture, as well as for other industrial and environmental purposes. The described method of producing a catalyst comprising a mixture of manganese dioxide, copper oxide and taluma with the addition of bentonite clay in the number of 7-20 wt.% when mixing, molding granules, hydrothermal treatment, drying and calcination. The proposed method can significantly reduce the wear of the nozzles when the industrial process of preparation of the catalyst while maintaining high levels of performance on the formed granules. table 1.

The invention relates to the field of inorganic chemistry and can be used in particular for the preparation of the catalyst used for the decomposition of ozone in production with his participation, namely: water treatment, wastewater treatment, quenching the ve, as well as for other industrial and environmental purposes.

A known method of producing a catalyst for decomposing harmful impurities, comprising a mixture of manganese dioxide, copper oxide and a binder (bentonite clay) in the ratio 100:(15-30):14, forming granules, drying at a temperature of 60-90oC for 9-15 hours and heat treated at a temperature of 260-350oC for 20-40 minutes (RF Patent N 1806008 from 26.11.91,, CL 01 J 37/04, 23/84).

The disadvantage of this method is the instability of the granules obtained catalyst towards the water.

There is also known a method of producing a catalyst for decomposing harmful impurities, comprising a mixture of manganese dioxide, copper oxide and a binder (taluma) in the ratio(30-40):(20-30):(30-50), forming granules by extrusion of the mixture components in the matrix with subsequent extrusion of granules, their hydrothermal treatment at a temperature of 90-100oC for 2 hours and calcination at a temperature of 300oC for 3 hours (A. C. USSR N 1768247 from 29.12.90,, CL 01 J 23/84, 53/36).

The disadvantage of this method is the low efficiency of the technological process of preparation of the catalyst due to the inability formovaniem proposed to the technical essence and the number of matching characteristics is a method of preparation of the catalyst, comprising a mixture of manganese dioxide and copper oxide with a binder (calumon), pre-treated water at a temperature of 70 - 100oC for 0.5 to 5.0 hours, and calcined at a temperature of 200 - 1000oC for 1-6 hours, molding pellets in the auger granulator, hydrothermal treatment, drying and calcination (RF Patent N 2077947 from 04.04.95,, CL 01 J 23/889, 37/04 // (01 J 23/84, 101:62)).

The disadvantage of this method is the considerable wear of the dies in forming the pellets due to strong abrasive properties of the molded catalyst mass.

The claimed invention is directed to the solution of the following problem: reduction of wear of nozzles while maintaining high level of performance molded pellets, which is achieved by the proposed method comprising a mixture of manganese dioxide, copper oxide and taluma, molding granules, hydrothermal treatment, drying and calcination.

The difference of the proposed method against known is that when mixed add the bentonite clay in the number of 7-20 wt.%.

Of scientific and technical literature authors unknown technological operation of adding bentonite clay in the number of 7-20 wt.% when mixed avannah on a single set of nozzles granules (set/kg).

The method is as follows.

Take 0,6-1,0 kg taluma, treated with water at a temperature of 70-100oC for 0.5 to 5.0 hours, and then calcined at a temperature of 200-1000oC for 1-6 hours. The thus treated Tulum load in a paddle mixer with steam jacket, which is pre-loaded 0,6-0,8 kg manganese dioxide and 0.4-0.6 kg of copper oxide (in terms of dry substance). The mixing process is carried out at a temperature of 40-70oC for 0.3 to 1.0 hours at the beginning of the process in a mixer add 0,15-0,4 kg bentonite clay. The resulting paste is unloaded and molded on to the screw granulator at a temperature of 100-110oC and a pressure of 35-45 ATM through a Spinneret hole diameter of 1.0-1.5 mm Molded pellets kept in air at room temperature within 8-36 hours, subjected to hydrothermal treatment at a temperature of 80-100oC for 2-5 hours, dried at a temperature of 80-200oC for 3-10 hours and calcined at a temperature of 300-400oC. wear of the dies upon receipt of the catalyst according to the proposed method was 0,041-0,067 set/kg, the wear of the dies upon receipt of the catalyst by a known method was 0,31-0,37 set/kg. When this piece is the ith value when using the known method is 85-114 kg/h

Example 1.

Take 0,8 kg taluma and treated with water at a temperature of 80oC for 3 hours and then calcined at a temperature of 400oC for 4 hours. The thus treated Tulum load in a paddle mixer with steam jacket, which is pre-loaded 1.4 kg of a paste of manganese dioxide with a humidity of 50% and 0.9 kg of a paste of copper oxide with a humidity of 55%. In a mixer add 0.15 kg bentonite clay and lead the process of mixing at a temperature of 50oC for 0.5 hours. The resulting paste is unloaded and molded on to the screw granulator through a Spinneret hole diameter of 1.2 mm Formed granules kept in air at room temperature for 24 hours, subjected to hydrothermal treatment at a temperature of 80oC for 5 hours, dried at a temperature of 150oC for 3 hours and calcined at a temperature of 400oC. wear of the dies upon receipt of the catalyst according to the proposed method was 0,067 set/kg, the productivity of molded pellets amounted to 105 kg/h

Example 2.

The process, as in example 1, except the amount of bentonite clay added to the mixer, which was 0.3 kg of Wear of nozzles is authorized pellets amounted to 108 kg/h

Example 3.

The process, as in example 1, except the amount of bentonite clay added to the mixer, which amounted to 0.4 kg of wear of the dies upon receipt of the catalyst according to the proposed method was 0,041 set/kg, the productivity of the molded pellet was 104 kg/h

The effect of the amount of bentonite clay added to the mixer, on the wear of nozzles and performance molded pellets are shown in table.

As follows from the data shown in the table, the largest decrease wear of nozzles while maintaining high level of performance molded granules is observed when adding bentonite clay in the number of 7-20 wt. % Adding bentonite clay in amounts of less than 7 wt.% wear of nozzles is reduced slightly, and the addition of bentonite clay in the amount of more than 20% of the mass. does not lead to any appreciable change this parameter.

The essence of the proposed method is as follows.

Reduced wear of nozzles while maintaining high level of performance molded granules adding bentonite clay in the number of 7-20 wt. % obpl is xida manganese, oxide of copper and taluma formed highly pasta catalyst components, which is easily formed on the screw granulator. This is because the interaction energy of the particles of the binder between themselves and the interaction energy of the particles of the binder between particles of manganese dioxide and copper oxide close due to the fact that the components of the catalyst are fine and have dimensions of the same order. However, the presence in the composition of a paste particles taluma having considerable strength, leads to high abrasive properties of a mixture of manganese dioxide, copper oxide and taluma. This leads to the fact that when the molding is the rapid increase in the diameter of the holes of nozzles and required replacement. On the other hand, bentonite clay has, firstly, a significantly lower hardness than any of the components of the mixture used in the implementation of the known method. And secondly, its dispersion is significantly higher than that of manganese dioxide, copper oxide and taluma. In addition, the main mineral bentonite clay is montmorillonite, which belongs to the layered minerals with expanding lattice. Mix in the aquatic environment leads to the fact that in the packet of protrans the eh plasticizer. Therefore, when adding bentonite clay particles of the latter, is uniformly distributed over the volume of the mixture, block local areas of surface high hardness, which leads to reduction of the abrasive properties of the moldable paste and thus to increase the service life of dies. Adding bentonite clay in amounts of less than 7 wt.% does not lead to any significant reduction of the wear of the nozzles, as in this case due to low concentration of plasticizer blocking local areas of surface with high hardness is low and the abrasive properties of the moldable paste mainly preserved. Adding bentonite clay in more than 20 wt.% does not result in any appreciable reduction of the abrasive properties of the moldable paste and thus reduce wear of nozzles.

Thus, the proposed method can significantly reduce the wear of nozzles while maintaining high level of performance molded granules.

Implementation of the proposed method will significantly expand the scope of the catalyst in water treatment, wastewater treatment, processing of semiconductors in the electronics industry, sterilization SS="ptx2">

From the above it follows that each of the signs stated together to a greater or lesser extent affect the solution of the problem, namely, to reduce wear of nozzles while maintaining high level of performance molded pellets, and the entirety is sufficient to characterize the claimed technical solution.

A method of producing a catalyst for decomposing harmful impurities, comprising a mixture of manganese dioxide, copper oxide and taluma, molding granules, hydrothermal treatment, drying and calcination, wherein when mixed add bentonite clay in an amount of 7 to 20 wt.%.

 

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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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