Method of preparing catalyst-containing solid product and device for applying supporting porous material onto inside or outside metallic surface of a hollow body

FIELD: catalyst preparation.

SUBSTANCE: invention relates to supported catalysts and provides a method for preparing catalyst-containing solid product comprising step, wherein ceramic carrier is applied onto metallic surface, and depositing catalytically active material onto ceramic carrier, which was preliminarily coated with supporting porous metallic material, ceramic carrier being applied onto and/or into supporting porous metallic material. Invention also describes device used in preparation of catalyst-containing solid product for applying supporting porous material onto inside or outside metallic surfaces of the hollow body.

EFFECT: increased stability of catalyst.

7 cl, 2 dwg

 

The present invention relates to catalysts on a carrier, in particular to a method for having the catalyst solid product and device for applying a supporting porous metal material on the inner or outer metal surface of the hollow body.

The term with the catalyst solid product, as used within this application, refers to a catalytically active product, having a catalyst deposited on a metal surface. The catalysts deposited on a metal surface, useful in some applications.

The coating of catalytically active material on a metal surface is a well-known process, commonly referred to as the wet method, disclosed, for example, in the publication "Structured catalysts and reactors ("Structured catalysts and reactors" "), authors: Cybulski, A, and Moulijn, J.A., publisher Marcel Dekker, Inc., New York, 1998, Chapter 3 and references therein.

According to the known methods suitable metallic material, preferably ferrite steel containing chromium and/or aluminum, is heated to a temperature usually above 800°to get the surface layer of chromium oxide and/or aluminum. This layer promotes good adhesion of the ceramic material to the surface of the steel. A thin layer of a suspension containing precursor is eroticheskoe material, applied to this surface by known techniques, for example by spraying, smearing, or dipping. After coating the slurry is dried and calcined at a temperature usually between 350 and 700°C. Finally, the ceramic layer is impregnated with a catalytically active material. There is another way, when the catalytically active material is applied simultaneously with the ceramic precursor.

With the application of the catalyst on the metal surface by known methods involve certain disadvantages. Can only be used a certain combination of catalyst and metal, as must be received by the adhesion of the ceramic material to the metal surface. Moreover, even if the adhesion is obtained, the catalyst coating can be damaged, if the adhesion force is reduced due to conditions, subjected to the catalyst. Destruction of the catalytic coating may be caused by thermal stress, dust and other factors.

The present of the invention is to provide a method of obtaining having the catalyst solid product that does not evince the above disadvantages.

The problem is solved by the proposed method of obtaining having solid catalyst products, which includes stages of deposition of ceramic but is of Italia on the metal surface and the coating of catalytically active material on a ceramic carrier, which is that before applying the ceramic material to the metal surface cause supporting porous metal material, and the application of ceramic media carry on and/or in support of a porous metal material.

Supporting porous metal material having a higher strength as compared with a ceramic material, preferably applied to the metal surface. Supporting porous metal material preferably is a metal foam, a metal mesh, expanded metal, sintered metal, metal mesh fabric, etc. Supporting porous metal material is applied on a metal surface, for example, by a method of brazing or diffusion bonding. After that, the ceramic precursor in the form of a suspension contribute into the porous structure of the porous metal support material in a known manner, for example by spraying, smearing, or dipping. The suspension is then dried and calcined. And finally, the ceramic layer is impregnated with a catalytically active material in accordance with known methods. There is another way, when the catalytically active material is precipitated simultaneously with the ceramic precursor. Application support is the future of the porous metal material on the metal surface can also be implemented in the mobile area, heating, where it is possible to apply mechanical pressure.

The present invention also relates to a device for applying a supporting porous metal material on the inner or outer metal surface of the hollow body, for example, a tube containing induction furnace with zone heating, which is adapted for partial heating of the metal surface, and a piston located within the zone of heating and holding the supporting porous metal material to the metal surface.

Supporting porous metal material, after suitable pre-processing of this material and the tube is installed in the tube by solder. The tube is placed in the induction furnace so that part of the tube was heated above the temperature of the soldering. Use the piston in the form of a mandrel or a sphere (ball)to pin supporting porous metal material to the tube wall in the area of soldering to ensure contact between the supporting porous metal material and the wall of the tube.

A variant embodiment of the proposed device createcase shown in figure 1.

Zone heating 1 and the mandrel 2 advancing along the tube 3 to provide a solder-supporting porous metal material 4 along the entire length of the tube. In addition, sabreena applicable to other geometry, different from the geometry of the round tubes, when using a mandrel of appropriate shape. Induction furnace can also be used for drying and calcination of the catalyst.

Figure 2 shows another variant embodiment of the invention for applying a supporting porous metal material to the outer wall of the tube. As can be seen in figure 2, the annular frame 5 serves to clamp the supporting porous metal material 4 to the outer wall of the tube in a manner similar to the already described manner.

The invention is illustrated by the following example.

Example

A rectangular piece of Nickel foam roll with the formation of the cylinder and on the outer surface of the Nickel foam rolled plate-solder type MBF 51 (foil Nickel-based). The obtained compound is injected into the tube with an inner diameter of 45 mm, made of alloy 800, representing an alloy based on iron, Nickel and chromium. The width of the compound chosen, taking into account the internal perimeter of the tube. Open ends of the tube is closed by a loose placement of the shutter in which the hole.

Through the opening of one gate (end 1) pass containing hydrogen and argon gas, which comes out at the other end (end 2). Through the hole on the other shutter (end 2) place the piston is placed at the end of ODA is vcoi. The induction coil is placed around the tube in the same place inside the tube is mandrel. Induction coil gives off heat, and the receiver moves along the coil while maintaining the position of the fixed mandrel. The mandrel is slightly greater than the area subjected to heat. In this zone, the solder is melted by pressing the Nickel foam to the wall of the tube. Outside exposed to the heating zone of the mandrel still extrude Nickel foam to the wall of the tube as long as the temperature is not low enough to ensure solidification of the solder. When moving the tube through the induction coil layer of Nickel foam firmly associated with the inner wall of the tube along its entire length except for the end of 1, corresponding to the width of the induction coil. Therefore, the induction coil cannot pass the gate at the end of the 1st. After application of the specified compound consistently applied ceramic carrier and a catalytically active material by known methods.

1. The method of obtaining having solid catalyst products, which includes stages of deposition of ceramic media on the metal surface and the coating of catalytically active material on the ceramic carrier, wherein before applying the ceramic material to the metal surface cause supporting porous IU allicance material, and the application of ceramic media carry on and/or in support of a porous metal material.

2. The method according to claim 1, characterized in that the supporting porous metal material is applied on a metal surface by prepaymania or diffusion bonding.

3. The method according to claim 1, characterized in that the supporting porous metal material is applied on a metal surface by applying mechanical pressure.

4. The method according to claim 1, characterized in that the supporting porous metal material is applied on the metal surface in the mobile zone heating.

5. The method according to claim 1, characterized in that the supporting porous metal material is applied on a metal surface by placing a metal surface in the mobile zone heating and applying it in the area of heating mechanical pressure.

6. The method according to any one of claims 1 to 5, characterized in that the supporting porous metal material applied to the surface of the tube.

7. The device used in the method of obtaining having solid catalyst product according to claims 1-6, for applying supporting porous metal material on the inner or outer metal surface of the hollow body, characterized in that it contains induction the Yu furnace with zone heating adapted for partial heating of the metal surface, and a piston located within the heating zone, for clamping the supporting porous metal material to the metal surface.



 

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