Method of preparation of oxide catalysts

 

(57) Abstract:

The invention relates to catalytic chemistry, in particular to methods of preparation of oxide catalysts, and may find application in the chemical industry. The aim of the invention is the production of more active and selective oxide catalysts. The described method of preparation of oxide catalysts, including thermal effects on easily decomposing a salt of a catalytically active metal, this impact is realized by the continuous scanning of the laser radiation of a wavelength of 10.6 μm and/or of 1.06 μm with a capacity from 10 to 100 watts on a layer of easily decomposing the salt of the catalytically active metal with a thickness of 1-5 mm Laser treatment is carried out in multiple passes through a variety of temperature regimes at different passages. Laser thermal effect is carried out in a constant magnetic field. The resulting catalyst has a higher activity and selectivity. 2 C.p. f-crystals, 1 table.

The invention relates to catalytic chemistry, in particular to methods of preparation of oxide catalysts, and may find application in the chemical industry.

Obtaining oxide catalysts widely the CLASS="ptx2">

There is a method of cooking nickelchromium hydrogenation catalyst by deposition of nitrate salts of Ni and CR soda solution at room temperature followed by filtration, washing the precipitate from the nitrate ion, drying, calcination, pelletizing and activation in a stream of hydrogen, and its improvement (Catalyst a Nickel-chromium, OST 6-03-314-71).

This method of preparation of the catalysts has a number of disadvantages: cumbersome filtration equipment, the presence of large volumes of wastewater at the stage of washing and filtering, the need for stage calcination in a stream of nitrogen.

Closest to the claimed invention is the following method: prepared media (e.g., foam ceramics) incubated in an aqueous solution of salts (nitrates, bichromates) metals having an insoluble hydroxide, and containing urea in a molar ratio to the metal salts of 1:(5-14) at 70-95oWith, then it is dried in air and heated to a temperature at which the decomposition of the hydroxide and the formation of a catalytically active oxide (RF Patent 2055638, CL 01 J 23/74, 23/34).

The above work can be considered the prototype of the proposed out what she metals under the influence of laser radiation.

The aim of the invention is the production of more active and selective oxide catalysts.

This is achieved in that in the method of preparation of oxide catalysts, including thermal effects on easily decomposing a salt of a catalytically active metal, this impact is realized by the continuous scanning of the laser radiation of a wavelength of 10.6 μm and/or of 1.06 microns, with a capacity from 10 to 100 watts on a layer of easily decomposing the salt of the catalytically active metal with a thickness of 2-5 mm

In addition, in the case of preparing an oxide catalyst on a porous inorganic carrier easily decomposing the salt of the catalytically active metal is pre-applied to the media, and then carry out laser thermal effect.

To ensure complete decomposition of laser processing is performed in multiple passes through a variety of temperature regimes at different passages.

Introduction in the area of laser processing of a constant magnetic field can improve the catalytic activity and selectivity of the catalyst.

Example 1. As a material for the production of Nickel catalyst COI is and, working in continuous mode (lines 2-3 table 1).

The sequence of operations in the manufacture of oxide catalysts is as follows. The control device 1, paired with the personal computer 2, provides movement of the coordinate table 3 in the horizontal plane by the given contour of the hatch, and also controls the opening and closing of the valve on the laser 5 blocking or transmitting laser radiation Salt of the metal 4 is placed in the area of laser irradiation and treated with a scanning laser radiation. The processing mode is selected to ensure complete decomposition of salt

Example 2. As a material for the production of Nickel catalyst was used Nickel nitrate Ni(NO3)26N2Oh, pre-dried in a muffle furnace at a temperature of 60oC for 2 hours. The decomposition was carried out in multiple passes on a continuous Nd-YAG laser and in a constant magnetic field (line 4 of table 1) the Order of processing is the same as in example 1.

Example 3 (comparative). The Nickel nitrate was dried in a muffle furnace at 60oAnd then decomposed according to the following temperature scheme: heating to 110oWith in 24 hours, podon weight (row 1 of table 1).

The oxides obtained in various ways, was activated in a stream of hydrogen and then tested in hydrogenation reactions of benzylcyanide to-phenethylamine. The activity of the catalyst (K) was estimated by the degree of conversion of benzylcyanide, selectivity (S) for the content catalyzate-phenethylamine.

The results are given in table 1.

1. Method of preparation of oxide catalysts, including thermal effects on easily decomposing a salt of a catalytically active metal, wherein thermal effect is realized by the continuous scanning of the laser radiation with a wavelength of 10.6 and/or 1.06 µm with a capacity from 10 to 100 watts on a layer of easily decomposing to the oxide salt of the catalytically active metal thickness from 2 to 5 mm.

2. The method of preparation under item 1, characterized in that thermal effect on the easily degradable salt of the catalytically active metal is carried out in multiple passes through a variety of thermal regimes on individual passages.

3. The method of preparation by PP. 1 and 2, characterized in that the laser thermal effect is carried out in a constant magnetic field.

 

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