Method of preparing catalyst for treating gas to remove organics and carbon monoxide

FIELD: gas treatment catalysts.

SUBSTANCE: catalyst preparation method comprises depositing initially liquid soda glass onto metallic or glass-cloth surface, after which transition metal oxide mixture is sputtered onto wet surface, said transition metal oxide mixture containing, wt %: chromium (III) oxide 18-35, manganese (IV) oxide 18-35, alumina - the rest; or cupric oxide 5-15, chromium (III) oxide 10-15, alumina - the rest; or cupric oxide 12-35 and alumina - the rest. Resulting coating is dried in air during 1 day and then molded through stepwise heat treatment to temperature 400°C, which temperature is maintained for 2-2.5 h.

EFFECT: prolonged lifetime at the same catalytic efficiency.

3 tbl

 

The present invention relates to the production of catalysts that can be used for purification of exhaust gases from road transport exhaust gases from the spray chambers and other industrial installations, where gases emitted into the atmosphere contain harmful organic substances and carbon monoxide.

Known catalyst for purification of gas emissions from harmful impurities (RF Patent 2062144, bull. No. 18, 1994), consisting of nickelcobalt spinel, Nickel oxide and aluminum oxide. Known catalyst for deep oxidation of organic compounds and carbon monoxide (RF Patent 2063803, bull. No. 20, 1996), consisting of the oxides of manganese and aluminum.

The method of obtaining data of catalysts is time-consuming and complicated technology, so the cost of such catalysts is quite high.

A known method of producing a catalyst for purification of gas from organic substances and carbon monoxide (RF Patent 2068298, bull. No. 30, 1996). The catalyst was prepared as follows: first, prepare a binder solution consisting of oxides of aluminum, chromium (III) and the anhydride of phosphoric acid, then prepare the catalytically active mixture consisting of oxides of chromium (III), copper (II) and barium. Next, prepare a water suspension comprising a binder material and a charge, which covers the metal surface of the ü. After drying the coating in air on her wet surface a thin layer of fine, highly active aluminium oxide-platinum catalyst.

The disadvantage of this method of preparation of the catalyst are:

- the complexity of the technological process;

the high cost of aluminium oxide-platinum catalyst;

- the high cost of the resulting catalyst.

A known method of producing a catalyst for purification from organic compounds and carbon monoxide, is chosen for the prototype (Patent RF 2131772, bull. No. 17, 1999). The catalyst was prepared by coating on the surface of the metal, or fiberglass, or ceramic, and a method of dipping in a suspension containing the oxides of chromium (VI)chromium (III) and manganese (IV) in the following ratio, wt.%:

oxide chromium (VI)18-20
oxide chromium (III)18-20
manganese oxide (IV)30-32
water demineralizedthe rest,

followed by drying at a temperature of more than 80°C for at least 4 h and calcining at a temperature of 300 to 400°C for 1 h

The disadvantage of this method of preparation of the catalyst are:

- the use of the technology for production of the catalyst is very corroded and toxic substances - is midride chromic acid;

- low hardness, flexibility and adhesion of the catalytic coating.

Objectives method of producing a catalyst for purification of gas from organic matter and carbon monoxide are the creation of safe and healthy conditions of preparation of the catalyst, increasing the hardness, ductility and adhesion of the catalytic coating to the substrate, increasing the life of the catalyst while maintaining its catalytic efficiency, cost reduction catalyst.

These objectives are achieved by the fact that beforehand on the surface of the metal or metal and fiberglass put a layer of liquid sodium silicate glass with a modulus of 2.6-3.0, then to wet the surface of the sprayed coating a mixture of oxides of transition metals of the following composition, wt.%:

oxide chromium (III)18-35
manganese oxide (IV)18-35
aluminium oxiderest

or composition, wt.%:

the copper oxide (II)5-15
oxide chromium (III)10-15
aluminium oxiderest

or composition, wt.%:

the copper oxide (II) 12-35
aluminium oxiderest

moreover, the dispersion of the particles is not more than cm, then form a catalytic coating smooth step heat treatment with the extract every 50°ranging from 50°With up to 400°With, within 0.3-0.4 hour at each stage, and at 400°incubated for 2-2,5 hours.

Before applying a layer of liquid sodium glass on a metal surface to produce cleaned mechanically and shirring on the press.

Corrugated metal ribbon and the ribbon of glass after applying a layer of liquid sodium glass and spraying a mixture of oxides of transition metals air-dried during the day, then wound into a roll so that the fiberglass with a catalytic coating was located between layers of corrugated metal strip with a catalytic coating.

If you want to make the catalyst entirely of metal tape, then the tape from fiberglass to replace the metal strip.

The set of features of the proposed technical solution - method of producing a catalyst for purification of gas from organic substances and carbon oxide is different from the prototype and not follow explicitly studied the prior art, therefore, the author believes that the way is what I new and involves an inventive step.

A method of producing a catalyst for purification of gas from organic substances and carbon monoxide allows to produce at a low cost catalytic filters for purification of exhaust gases of motor transport of hazardous substances or catalytic filters for purification of exhaust gases into the atmosphere from organic substances and carbon monoxide from different production facilities and efficient to operate them in a long time. A method of producing a catalyst for purification of gas from organic matter and carbon monoxide as follows.

Example.

Tape steel NT thickness of 0.15 mm and a width of 35 mm was cleaned with two sides grit sandpaper, then made shirring on the press. On corrugated steel tape and the tape from the glass, of a width of 35 mm and a thickness of 0.25 mm was applied on both sides of the layer of liquid sodium silicate glass with module 2,61-3,0 (GOST 13078 grade B), then for corrugated steel tape and the ribbon of glass having a wet coating of liquid sodium glass, napisali on both sides of the layer of a mixture of oxides of transition metals having the following compositions and ratios of components:

The first option

Oxide chromium (III)
The ratio of components, wt.%
183515402520
Manganese oxide (IV)183525251540
Aluminium oxide643060356040

The second option

The ratio of components, wt.%
The copper oxide (II)5154171010
Oxide chromium (III)15101515820
Aluminium oxide807581688270

A third option

The ratio of components, wt.%
The copper oxide (II)12351040
Aluminium oxide82659060

In all experiments, the dispersion of oxides of transition metal is low was 20-80 microns.

Tape coated kept indoors during the day, then made a winding corrugated steel tape and ribbon of glass into a roll so that the ribbon of glass is positioned between the layers of corrugated steel strip.

Samples of catalysts were tied nichrome wire. The catalyst samples had the dimensions: diameter 30 mm, height - 35 mm Samples of the catalysts were subjected to heat treatment in a muffle furnace with stops for 25 minutes every 50°starting with 50°and up to 400°and at 400°With the samples stood for 2 hours. After heat treatment the samples were cooled in the indoor environment. The catalyst samples were tested for cleaning gas from xylene and carbon monoxide. The concentration of xylene in Gaza amounted to 0.25%, carbon monoxide is 0.15%. The gas temperature and the catalyst was 360-380°C. Specific volumetric rate of gas flow through the sample catalyst was 1.8·104h-1.

Experiments to test samples of the catalysts were carried out to determine the influence of the boundary of the technological parameters of the method of preparation of the catalyst on its catalytic efficiency. The results obtained in the first embodiment are summarized in table 1, according to the second variant, in table 2, in the third variant in table 3.

During the test of the treatment the samples of catalysts, made entirely of metal ribbon, and the ribbon of glass was replaced by a metal strip of a thickness of 0.25 mm, the results for the catalytic activity, is practically identical with the results obtained in example 1.

Table 1

The influence of the ratio of components in the mixture of oxides of transition metals, intended for surface coating of metal and fiberglass, the catalytic efficiency filter
No. of experimentsThe ratio of chromium (III), manganese (IV) and aluminium, wt.%The dispersion of the oxides of chromium (III), manganese (IV) and aluminium, mcmCatalytic filter efficiency, %
Cr2O3MnO2Al2O3The xyleneFor carbon monoxide
118186420-8092,690,1
235353020-8094,8of 92.7
315256020-8090,8to 89.9
4 40253520-80to 92.191,0
525156020-8089,388,2
620404020-8093,591,8

Table 2

The influence of the ratio of components in the mixture of oxides of transition metals, intended for surface coating of metal and fiberglass, the catalytic efficiency filter
No. of experimentsThe ratio of copper oxide (II), chromium (III), aluminum, wt.%The dispersion of copper oxide (II), chromium (III) and aluminium, mcmCatalytic filter efficiency, %
CuOCr2O3Al2O3the xylenefor carbon monoxide
15158020-8093,791,9
215107520-80943 of 92.7
34158120-8090,189,3
417156820-80to 92.190,8
51088220-8090,2to 89.5
610207020-80for 91.389,2

Table 3

The influence of the ratio of components in the mixture of oxides of transition metals, intended for surface coating of metal and fiberglass, the catalytic efficiency filter
No. of experimentsThe ratio of copper oxide (II) and aluminum, wt.%The dispersion of copper oxide (II) and aluminium, mcmCatalytic filter efficiency, %
CuOAl2O3the xylenefor carbon monoxide
1128820-80 91,788,9
2356520-8093,389,7
3109020-8088,487,6
4406020-8090,3at 88.1

The catalytic efficiency of the filters is 90-94%. The technical result - the simplification of the technological process of preparation of the catalyst and reduce its cost.

1. A method of producing a catalyst for purification of gas from organic matter and carbon monoxide, comprising coating the surface of metal, fiberglass coatings containing metal oxides, drying and subsequent heat treatment of the coating, wherein the pre on the surface of the metal and fiberglass put a layer of liquid sodium silicate glass with a modulus of 2.6-3.0, then to wet the surface of the sprayed coating a mixture of oxides of transition metals of the following composition, wt.%:

Oxide chromium (III)18-35
Manganese oxide (IV)18-35
Aluminium oxideRest
or composition, wt.%:
The copper oxide (II)5-1
Oxide chromium (III)10-15
Aluminium oxideRest
or composition, wt.%:
The copper oxide (II)12-35
Aluminium oxideRest

moreover, the dispersion of the particles is not more than 80 μm, to form a catalytic coating smooth step heat treatment with the extract every 50°With a starting temperature of 50 to 400°within 0,3-0,4 h and at a temperature of 400°incubated for 2-2,5 hours

2. The method according to claim 1, characterized in that before applying a layer of liquid sodium glass on a metal surface to produce cleaned mechanically and shirring on the press.

3. The method according to claim 1, characterized in that in the manufacture of catalysts based on metal and glass cloth surfaces corrugated metal ribbon and the ribbon of glass after applying a layer of liquid sodium glass and spraying a layer of metal oxide is dried in the air for days, and then wound into a roll so that the fiberglass with a catalytic coating was located between layers of corrugated metal strip with a catalytic coating.



 

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