A method for production of nickel-alumina-chrome catalyst for redox processes, in particular for mahanirvana carbon oxides

 

(57) Abstract:

The invention relates to methods for Nickel-alumina-chromium catalysts used for hydrogenation processes, gas purification, for processes mahanirvana oxides of carbon. Describes a method for Nickel-alumina-chromium catalyst by treating the dry mixture of the basic Nickel carbonate with aluminum oxide with a solution of chromic anhydride, used in the amount of 93-98 wt.% from design, add to the resulting mass of ammonia water containing NH322-30 wt.% 1:0,30,8 wt.h. accordingly, drying, calcination, plasticization, drying, calcination, additional processing calcined weight solution of chromium trioxide, taken in an amount from 2 to 7 wt.% from the estimates, tabletting and recovery. The technical result is an increase in the activity and mechanical strength of the catalyst. 1 C.p. f-crystals.

The invention relates to methods for Nickel-alumina-chrome catalyst, which is widely used in industry for hydrogenation, for example, organic compounds, purification of process gases from oxygen and oxygen-containing impurities, as well as for processes mahanirvana xiaowei organic compounds by co-deposition soda solution of basic Nickel carbonate and hydroxides of chromium and aluminum from their nitrogen salts at a temperature of 50-90oC and a constant pH, followed by filtration of the mixture, rinsing until the end of the absence of nitrate ion, drying, calcination, pelletizing, the restoration of [RU 229467 AND 19.11.1969].

The disadvantage of this method is the existence of stages of filtration, washing the mixture to the complete lack of nitrate-ion battery, which greatly complicates its implementation.

Also known is a method of obtaining a Nickel-alumina-chrome catalyst, optionally containing calcium aluminate, for the purification of hydrogen and hydrogen-containing gases from carbon oxides by mixing powdered alumina, calcium aluminate and basic Nickel carbonate by adding ammonia water, followed by the introduction of a solution of chromic anhydride, and then, while continuing the stirring, the mass is dried, plastificator, calcined, tabletirujut [EN 1051764 A1, 15.08.1990].

The disadvantages of this method include the need for the use of calcium aluminate content in the catalyst is up to 30 wt.%.

The closest known similar solution is a method for production of Nickel-alumina-chrome catalyst for redox processes, in particular for mahanirvana about what kalyanam, pelletizing and recovery [EN 403429 AND 28.11.1977]. Blending take pasty or dry mixture of the basic Nickel carbonate with alumina and treated with a solution of chromium trioxide.

The disadvantage of this method is to obtain a catalyst having low activity in the process of mahanirvana oxides of carbon and mechanical strength by forming. So the catalyst, obtained in a known manner, has activity in the reaction of mahanirvana oxides of carbon, determined by the temperature overshoot 100 ppm CO, 155oWith that strength by forming 35 MPa and a temperature of the recovery 275oC.

The present invention is to obtain a catalyst having high activity and mechanical strength.

The problem is solved in that the proposed method of producing a Nickel-alumina-chrome catalyst for redox processes, in particular for mahanirvana carbon oxides, includes the preparation of a catalyst mass by processing the dry mixture of the basic Nickel carbonate with aluminum oxide with a solution of chromic anhydride, used in the amount of 93-98 wt. % of RA is. the respectively, drying, calcining, followed by plasticization, drying, calcining, additional processing of the calcined weight solution of chromium trioxide, taken in an amount from 2 to 7 wt.% from the estimates, tableting, recovery. Plasticization is carried out by processing the calcined mass of water to obtain a plastic mass with a moisture content of 20-25 wt.%. The treatment of a solution of chromium trioxide in the beginning of the dry mixture of the basic Nickel carbonate with aluminum oxide, and then again at the stage of tabletting and a certain sequential order, the method allowed us to obtain a catalyst having high activity and mechanical strength, and also helped to reduce the temperature of the beginning of recovery.

The following is an example illustrating the present invention.

Example.

In the mixer asleep 67 kg basic Nickel carbonate, then shredded on a vibrating mill aluminum oxide in the amount of 48 kg stirred for 30 minutes, then fall asleep chromic anhydride in the amount of 14 kg, which is 93 wt.% from the calculation. Again stirred for 10 minutes, pour in 50 l of water, stirred for not less than the 1st fraction of ammonia 25% (1:0.5. 'clock respectively), dry mass at 80-90oWith to a moisture content of 15-25 wt.%, calcined at 380-400oC. the Calcined mass plastificator by adding 75 l of water to obtain a plastic mass with a humidity of 20 to 25 wt.% with the size of the lumps of about 10 cm, dried, and calcined at 380-400oWith up to SPT900=7-10%. Then the calcined mass is treated with 10 l of a solution of chromic anhydride concentration of not higher than 10 wt. % (1 kg chromium trioxide, which is 7 wt.% from the settlement), tabletirujut with graphite, restore.

The resulting catalyst contains, wt%:

NiO - 39, CR2ABOUT3- 10, Al2ABOUT3- 51.

Activity when mahanirvana of carbon monoxide were checked by hydrogenation at 125oWith 0.3 wt.% WITH the hydrogen to a residual CO content of less than 20 cm3/m3at a pressure of 5 ATM and a flow rate of 10000 h-1.

The catalyst showed activity in mahanirvana WITH defined leakage 100 ppm 145oWith that strength by forming 65 MPa and temperature recovery 255oC.

1. A method for production of Nickel-alumina-chrome catalyst for redox processes, in particular for mahanirvana carbon oxides, including cooked the chromic anhydride, drying, calcining, tableting, restoration, characterized in that the treatment of the dry mixture of chromic anhydride is used in the amount of 93-98 wt. % of estimated, to the resulting mass is added ammonia water containing NH322-30 wt. % in the amount of 1: 0.3 to 0.8 wt. 'clock respectively, dried, calcined, and then plastificator, dried, calcined, the calcined mass is further treated with a solution of chromic anhydride, taken in an amount from 2 to 7 wt. % of the calculated and subjected to pelletizing and recovery.

2. The method according to p. 1, characterized in that plasticization is carried out by processing the calcined mass of water to obtain a plastic mass with a moisture content of 20-25 wt. %.

 

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FIELD: hydrogenation-dehydrogenation catalysts.

SUBSTANCE: invention relates to catalysts used in isoamylenes-into-isoprene dehydrogenation process and contains, wt %: iron oxide 62-75.4, potassium carbonate 12-21.5, chromium oxide 1-3, potassium hydroxide 0.5-2.5, sulfur 0.1-2.0, ammonium nitrate 0.1-2.0, silicon dioxide 1-5, calcium carbonate 1-5, and cerium nitrate 1-3.

EFFECT: increased mechanical strength, resistance to saturated steam and moisture, and stability during long-time operation.

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