The preparation method of catalyst for redox processes

 

(57) Abstract:

The invention relates to a process for the preparation of catalysts based on Nickel, stabilized active alumina, for redox processes and can be used in the fine purification of process gases from oxides of carbon, oxygen, and to obtain protective atmospheres by dissociation of ammonia. The catalyst has high activity, stability and heat resistance. The inventive method for preparation of the catalyst for oxidation-reduction process includes mixing the basic Nickel carbonate with active alumina or aluminates of calcium, or high-alumina cement, and/or a mixture of aluminum oxide and calcium aluminate, adding to the mixture an aqueous solution of ammonia, drying, calcining, the catalyst mass, mixture with graphite, molding, drying the catalyst mass should be performed within 6-8 h in the presence of water vapor pressure of 0.5 MPa at 90-100oC, which regulate the flow of steam, and the calcination is carried out at the following mode: the temperature in the calcining furnaces were raised with a speed of 80-100 deg/h to 380-450oC and kept at this party different raw aluminium-containing substances.

The invention relates to a process for the preparation of catalysts based on Nickel, stabilized active alumina, for redox processes and can be used in the fine purification of process gases from oxides of carbon, oxygen, and to obtain protective atmospheres by dissociation of ammonia.

There is a method of preparation of the catalyst for redox processes, in particular for the hydrogenation of oxygen-containing compounds by mixing carrier selected from the group comprising aluminum oxide, magnesium oxide, zirconium dioxide, kaolin diatomite with hydraulic cement, Portland cement or calcium aluminate, followed by the introduction of basic Nickel carbonate, demineralized water, graphite, forming, annealing the catalyst mass, molding (US 4253991 A, class B 01 J 21/04, 03.03.81).

There is a method of preparation of the catalyst for redox processes, such as dissociation of ammonia, by mixing the oxides of the metal of group VIII with oxides of aluminum, calcium, silicon, followed by melting the mixture at a temperature of 1600 - 1700oC, cooling the melt and the preparation of the catalyst for redox processes, comprising a mixture of calcium aluminates, basic Nickel carbonate, graphite, followed by the addition with stirring of the water or aqueous solution of ammonia water, forming, annealing (SU 1264976 A1, class B 01 J 37/04, B 01 J 23/78, publ. 23.10.86).

The closest known solution of an analogous problem to the technical essence and the achieved effect is a method for preparing a catalyst for redox processes involving the mixing of basic Nickel carbonate with calcium aluminate, or active aluminum oxide, or high-alumina cement, and/or a mixture of aluminum oxide and calcium aluminate, adding to the resulting mixture of water or an aqueous solution of ammonia, drying, mixing with graphite, calcining the catalyst mass, molding (SU 428773, class B 01 J 23/74, publ. 25.05.74).

The catalysts obtained in a known manner, is used in the processes of mahanirvana, scavenging of nitric mixture of oxygen and dissociation of ammonia.

The disadvantages of this method include the lack of activity and heat resistance of the obtained catalyst. In addition, the catalyst, obtained in a known manner, partially cracks, which leads to an increase okogie and obtaining a catalyst with high activity, stability and heat resistance and preservation of these characteristics during long-term operation of the catalyst.

To solve the problem proposed by the present method of preparation of the catalyst for redox processes involving the mixing of basic Nickel carbonate with active alumina or aluminates of calcium, or high-alumina cement, and/or a mixture of aluminum oxide and calcium aluminate, adding to the mixture an aqueous solution of ammonia, drying, calcining, the catalyst mass, mixture with graphite, molding, drying the catalyst mass should be performed within 6 to 8 hours in the presence of water vapor pressure of 0.5 MPa at a temperature of 90-100oC, which regulate the flow of steam, and the calcination is carried out at the following mode: the temperature in the calcining furnaces were raised with a speed of 80-100oC per hour up to 380 - 450oC and kept at this temperature for 8-9 hours.

According to the invention is the simplification of the technology is achieved by carrying out drying in the presence of water vapor in the above mode, and calcining at a smooth rise in temperature, which virtually eliminates cracking tablets catalyst improves as theability catalyst for long term use.

The following example illustrates the present invention.

Example.

In the dryer load 300 kg of active milled aluminum oxide and 355 kg of basic Nickel carbonate, the dry ingredients stirred for 30 minutes and add 800 liters of ammonia water with a mass fraction of ammonia is not less 22-25%. The mass is stirred for 30 minutes, after which the jacket and the Central shaft of the dryer serves water vapor in the amount of 160 kg/h pressure of 0.5 MPa for 6,0-8,0 including steam regulate the temperature in the dryer 90-100oC. the Dried catalyst mass is served in the drum calcining furnaces were in the process of calcination, which is carried out in the following mode: the temperature in the calcining furnaces were raised with a speed of 80-100oC per hour up to 380 - 450oand kept at this temperature for 8-9 hours.

After calcination unloaded from the furnace, the mixture is fed to plow mixer, add the graphite in the amount of 18 kg/h and stirred for one hour, then using a condensate plastificator mass 30 minutes, unload the mixture from the mixer, compacted and tabletirujut. The weight of the finished catalyst is 606 kg

Use the source instead of the active substances aluminum oxide, laprimavera process of preparation of the catalyst in terms of the proposed technology also leads to a final product with improved catalytic performance and allows the catalyst using a variety of original aluminium-containing substances.

According to the invention the catalyst activity is increased by 7-9%, with the highest activity is obtained when using the original substances aluminum oxide, while providing stability during long-term operation.

The preparation method of catalyst for redox processes involving the mixing of basic Nickel carbonate with active alumina or aluminates of calcium, or high-alumina cement, and/or a mixture of aluminum oxide and calcium aluminate, adding to the mixture an aqueous solution of ammonia, drying, calcining, the catalyst mass, mixture with graphite, molding, characterized in that the dried catalyst mass should be performed within 6 to 8 h in the presence of water vapor pressure of 0.5 MPa at 90 - 100oC, which regulate the flow of steam, and the calcination is carried out at the following mode: the temperature in the calcining furnaces were raised with a speed of 80 - 100 deg/h up to 380 - 450oC and kept at this temperature for 8 - 9 hours

 

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