The preparation method of catalyst for medium-temperature conversion of carbon monoxide with water vapor

 

(57) Abstract:

Scope: the methods of preparation of catalysts for medium-temperature conversion of carbon monoxide containing oxides of iron, copper, chromium, which is used in industry for preparation of nitric mixture for the synthesis of ammonia. The method of preparation of the catalyst involves the precipitation of iron hydroxide from a solution of iron nitrate urea precipitator then receiving iron-containing component, the preparation of bichromate of copper, the mixture of its iron component, annealing, forming the catalyst mass as a precipitator use of ammonium-carbonate solution, the precipitate of iron hydroxide is separated and washed, dried, calcined at a temperature of 380 - 420oC, the catalyst mass is calcined at a gradual rise of temperature at a speed of 30 - 50oC/min at 400 - 450oC. Technical result - obtaining a catalyst with increased activity.

The invention relates to a method for preparing catalysts for medium-temperature conversion of carbon monoxide containing oxides of iron, copper, chromium, which is used in industry for obtaining attivazione the conversion of carbon monoxide with water vapor by co-precipitation of iron compounds and chromium, forming, drying, recovery of the catalyst mass, followed by impregnation of the recovered catalyst in an aqueous solution of ammonium carbonate complex of copper, drying and restoration [SU 303986 A, 07.10.1971].

A known method of obtaining a preformed catalyst for the conversion of carbon monoxide with water vapor by coprecipitation of iron salts, chromium and copper with sodium carbonate in the presence of needle-shaped particles ranging in length from 500 to 1500 nm, selected from oxides of aluminum, zinc, iron, washing the precipitate from the sodium oxide, drying, calcination, forming [DE 19513929 A1, 19.10.1995].

The closest known solution of similar tasks is the preparation method of catalyst for medium-temperature conversion of carbon monoxide with water vapor by precipitation of iron hydroxide from a solution of iron nitrate urea precipitator, which use ammonia water, followed by receiving iron-containing component, representing a suspension of iron hydroxide in the solution of ammonium nitrate, simultaneously prepare the bichromate of copper dissolution basic carbonate salt of copper chromic acid, then mixed suspension of iron hydroxide with copper bichromate and poroshkoobraz the logic of catalysts. Ed. by I. I. of Muglinova. L.: Chemistry, 1979, S. 133].

The present invention is to obtain a catalyst with increased activity.

To solve the problem proposed by the present method of preparation of the catalyst for medium-temperature conversion of carbon monoxide with water vapor by precipitation of iron hydroxide urea precipitator, which is used as an ammonium carbonate solution, the precipitate of iron hydroxide, washing, drying, calcination at a temperature of 380-420oC, resulting in a gain of iron-containing component, representing the iron oxide which is mixed with bichromate of copper obtained catalyst mass humidified by water, mold, provalivajut in air, dried and calcined at a gradual rise of temperature at a speed of 30 - 50oC/min at 400-450oC.

Due to the sequential stages of preparation and their mode of implementation get the catalyst with increased activity.

The following examples illustrates the present invention.

Example 1.

For the preparation of the catalyst according to the proposed method using iron oxide Fe2O3, recip is B>3)3= 360 g/l at a temperature of 65oC, pH 7.5; with constant stirring, ammonium carbonate solution containing ammonia 140 g/l and carbon dioxide (CO2) 90 g/l In the result of the interaction of a precipitate of Fe(OH)3in the solution of ammonium nitrate. The precipitate was separated from the mother liquor, washed from ions of NO3-, dried and calcined at 400oC.

To obtain 400 g of catalyst 325 g of the prepared iron oxide are thoroughly mixed in a z-shaped mixer at room temperature with bichromate of copper obtained by dissolving 28.1 g basic carbonate salt of copper (ACM) in chromic acid (48.2 g of chromic anhydride in 46 ml of water). After processing the mixture with bichromate of mass additionally moisturize with water and mix to a residual moisture content of 28%, after which it is discharged, is formed in the form of cylindrical pellets, provalivajut in air, dried at 100oC, stepwise heated to 400oC (50oC/h) and calcined for 4 hours.

The prepared catalyst has the following quantitative composition, wt.%:

Fe2O3- 87.0

Cr2O3- 8.0

CuO - 5.0

The resulting sample activity is determined by the degree of transformation () of carbon monoxide.

oC dissolved in water 57.9 g of chromic anhydride, and then download 16.7 g of the ACM. In parallel in the second reactor prepare a solution of nitrate of iron. For this purpose water reactor with constant stirring download 1515 g crystallohydrates nitrate of iron. The dissolution is carried out at 60oC. Precipitation of iron hydroxide is carried out at a temperature of 60oC 25% ammonia water. The resulting suspension is decanted from the solution of ammonium nitrate. The thickened suspension of Fe(OH)3washed twice with water and mixed with powdered 30.8 g of Al(OH)3; 42.4 g MgCO3Mg(OH)2and a solution of ACM in chromic acid. Next, the resulting suspension is stirred for half an hour, dried at 100oC and calcined at 400oC, is mixed with graphite and tabletirujut.

The prepared catalyst has the following chemical composition, wt.%:

Fe2O3- 75.0

Cr2O3- 11.0

Al2O3- 5.0

MgO - 6.0

CuO - 3.0

Activity (2such sample equal to 0.64.

As shown, the catalyst obtained by the proposed method has a high activity in comparable circumstances, the conduct is of erode with water vapor, including deposition of iron hydroxide from a solution of iron nitrate urea precipitator then receiving iron-containing component, the preparation of copper bichromate, mixing it with a ferrous component, drying, calcination, forming the catalyst mass, characterized in that as a precipitator use of ammonium-carbonate solution, the precipitate of iron hydroxide is separated and washed, dried, calcined at a temperature of 380 - 420oWith the obtained iron-containing component, representing the iron oxide, mixed with bichromate of copper, the catalyst mass is humidified by water, mold, provalivajut in air, dried and calcined at a gradual rise of temperature at a speed of 30 - 50oC/min at 400 - 450oC.

 

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