The catalyst carrier of honeycomb structure

 

(57) Abstract:

The invention relates to gas purification and can be used to produce catalysts for purification of industrial premises from harmful gases, afterburning of exhaust gases, oxidation of hydrocarbons, etc., the invention consists in the catalyst carrier of the cellular structure comprising a monolithic body with a multitude of through channels for the passage of the environment in which installed with a gap insertion cylindrical, or snakeblenny, or a star shape, made of the same material as the housing, and the insert and the body is made of red clay with the addition of the plasticizer, for example carboxymethylcellulose, in the amount of 10-12%. Due to the increased surface area of contact increases the degree of gas purification. 1 C.p. f-crystals, 1 tab., 3 Il.

The invention relates to the field of gas purification and can be used in the production of media catalysts of honeycomb structure used to obtain the catalysts for purification of industrial premises from harmful gases, afterburning of exhaust gases, oxidation of hydrocarbons, etc.

A well-known carrier, made in the form of cell block made from pastoe the eye are rectangular in shape (see A. with. N 1595558, IPC B 01 J 37/04, 35/04).

The disadvantage of analog is limited active surface of the channels for the application of the catalyst.

Known, the closest to the technical essence and the achieved result to declare catalyst carrier of honeycomb structure made in the form of a monolithic block having a multitude of through channels with improved geometry (roundness of channels for the passage of the medium ( U.S. Pat. USA N 4335023, IPC B 01 J 21/04).

The disadvantage of the carrier of the prototype is limited to the active surface of the channels for the application of the catalyst.

The objective of the invention is to design catalyst carrier with a larger specific surface area of contact to increase the level of treatment.

The problem is solved by the characteristics specified in paragraph 1 of the claims, in common with the prototype, such as, catalyst carrier cellular structures containing monolithic body with a multitude of through channels for the passage of the medium, as well as distinctive essential features, such as channels installed with a gap insertion cylindrical or snakeblenny or star-shaped, made of the same material is of karboksimetilcelljulozy (CMC) in the amount of 10 - 12 wt.%.

Supply device inserts in the form of a cylinder or screw or stars can significantly increase the specific surface area of contact.

The execution of inserts and housings media from the same material enables you to evenly distribute the catalyst layer on the active surface of the channels and inserts media that allows for simplified manufacturing techniques and to optimize the cleaning process.

In paragraph 2 the formula of the invention is characterized by the material from which the carrier of the catalyst, namely the enclosure and insert made of red clay with the addition of the plasticizer, for example, the CMC of 10 - 12%.

For production of carrier is used the most available and cheap material - red clay, which increases the economic efficiency of the proposed design.

Preferably as a plasticizer take CMC, because weight based on red clay this plasticizer has better formability.

If plasticizer take less than 10 wt.% the mass does not have sufficient plastic properties for molding media.

If the plasticizer take more than 12 wt.%, the reduced strength is provided to the carrier with inserts cylindrical shape.

In Fig. 2 - carrier with inserts in the form of a screw.

In Fig. 3 - carrier with inserts in the form of stars.

The carrier 1 includes a monolithic body 2 with a multitude of through channels 3 having a rectangular shape. Channels 3 installed insert 4 with a gap 5.

Insert 4 can be made of cylindrical shape (Fig. 1) or snakeblenny form (Fig. 2) or star-shaped (Fig. 3).

The body 2 and the insert 4 is made of red clay.

Preparation of material for production of catalyst carrier is as follows : mix a paste with a plasticizer and water in the kneading machine. A special extruder obtained mass is attached to the cellular form. Then "grid" undergo multi-stage drying and firing. In conclusion, is cutting elements along the length.

The device operates as follows.

The carrier 1 is placed in the device for purification of air (not shown) that drive the flow through the channels 3, and the stream comes into contact with the surface of the inserts 4, located in the channels 3, thereby increasing the area of contact of the catalyst with a gas and as a result increasing the degree to clean the PTO through-channels for the passage of the environment, characterized in that the channels are mounted with a gap insertion cylindrical, or snakeblenny, or a star shape, made of the same material as the body.

2. Media under item 1, characterized in that the enclosure and insert made of red clay with the addition of the plasticizer, for example carboxymethylcellulose, in the amount of 10-12%.

 

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FIELD: gas treatment catalysts.

SUBSTANCE: invention, in particular, relates to internal combustion engine exhaust gas neutralizers. Method of invention comprises rolling refractory metallic tape into block by way of overlapping its smooth and corrugated sides to form channels, performing ultrasound-assisted chemical cleaning of thus rolled tape in alkali solution followed by joining alternate layers of metallic tape with each other by diffusion welding in vacuo within a range of 5·10-5-1·10-5 mm Hg using stepwise heating to 1250 ± 10°С and isothermal exposure to this temperature for 12-17 min to form monolithic structure consisting of triangular and trapezoidal channel at density up to 600 channels per 1 inch2. Invention further describes carrier for catalytic exhaust gas neutralizers representing monolithic metallic structure in the form of cylindrical block or block with oval cross-section, which block consists of parallel channels, 200-600 per 1 inch2, density of channels varying along the cross-section of carrier: from center and extending to 0.55 0,7 diameter if cylindrical block or large axis of oval cross-section, density of channels is 400-600 per 1 inch2 and farther it decreases to 200 or 400 channel/inch2, respectively.

EFFECT: simplified manufacture technology and increased strength of monolithic cellular structure.

4 cl, 4 dwg, 1 tbl

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