JPH06503744A - Improvements to the catalyst and getter system and improvements related to the catalyst and getter system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to catalysts and catalyst getter systems. The present invention particularly Catalyst and getter systems used in, but not limited to, ammonia oxidation systems It is related to. Examples include nitric acid, hydrocyanic acid and other ammonia Includes catalysts used in the production of oxides.

Industrially, ammonia (NHa) is usually oxidized using a catalyst production method, and nitric acid ( This produces useful products such as HNOI) and hydrogen cyanide (I(CN)). The process uses one or more noble metal oxidation catalysts. Most widely used as a catalyst It is made of platinum or combined with other platinum-based metals such as rhodium and palladium. It is platinum that has been combined.

Since the beginning of this century, for example, as a catalyst for reactions such as ammonia oxidation, Woven gauze of platinum metal (PGM) is used. Catalyst getter system Much depends on the woven gauze. Gauze is usually composed of wire; It may also consist of elongated elements such as a substructure. Herein, the wire is It shall be defined including other elongated elements.

When used in reactors, wire gauze is typically supported in the reaction gas or fluid path. The reactant gases and fluids pass through the gauze and contact the catalytic material under controlled conditions. do.

In general, catalytic gauze is produced using a loom in the same way as weaving cloth. Crafted from the Son of Yar. Gauze mesh made on a loom usually has a certain There is a rectangular (usually square) gap. Variations of this plain weave include herringbone, There is a twill weave. Due to the nature of the weaving process, the gauze produced on a loom is rectangular.

The main type of gauze these days is 80 mesh per square inch (1024/am2). , using wire with a diameter of 0°0034 inches (0,076 am). others Generally 0.0024 inches (0,060 on) in diameter, 0.0027 inch inch (0,085 rm), 0.0036 inch (0,090).

0.1 [l of wire is used.

The thickness of the wire and the size of the mesh are important. This is because the reactant gas is a catalyst. Wire gating is done at a fairly high speed in proportion to the effectiveness, and without creating excessive back pressure. This is because the vehicle must pass through the Wire thickness is important for the following two reasons. be. First, the thicker the wire, the larger its cross-sectional area; The longer the substance is, the longer it will last under volatile (evaporation) conditions.

Since the oxidation of ammonia is a heat-intensive manufacturing method that involves an exothermic reaction, gauze is and stresses on the reactant gas flow, resulting in excessive degradation and catalyst loss. This should not lead to an increase or a decrease in the response effectiveness.

Known woven gauzes have a number of problems.

Weaving is difficult even with relatively high-speed rapiers and projectile looms. Since this is a labor-intensive process, production may be delayed, resulting in lower production of catalytic gauze per hour. Area production costs are high. Also, the gauze is made of precious metals and costs a considerable amount of money. In some cases, due to the slow weaving speed, it is not necessary to invest in high-value fixed assets for a long period of time. I will have to hold it. This phenomenon is known as "1Iletal 1ock" It is something. This means that large amounts of precious metals are released onto the world market before being sent to weaving operations. It's sitting in a warehouse wasting away without being turned around.

Furthermore, when producing new gauze or using wire with a different composition or diameter, When using this method, it takes time to assemble the machine and the weaving speed becomes even slower. Also wire - density cannot be easily changed. However, the weaving method is not flexible. Ru.

Woven gauze itself has its own problems. For example, woven gauze usually comes in a rectangular shape. If the final desired shape is circular or non-rectangular, first use a larger piece of gauze. After finishing, it is then cut into the desired shape. The scraps that come out during this bleed is a waste that comes out even if you don't want it. And bleed adds additional production time. It will be extended.

In addition, woven gauze tends to warp due to thermal stress during exothermic reactions, causing wrinkles and ridges (r) in a tortoiseshell pattern. idge), chrysanthemum rolls (stomach wrinkles) occur. These kind of ridges are a kind of This results in undesirable side effects in the process. For example, in a hydrogen cyanide reactor, The actual layer thickness increases in the area, and the residence time of the reaction gas and side products becomes longer. Carbon precipitation increases. Next, carbon precipitates on the catalyst surface and covers the catalyst surface, causing catalytic effectiveness. It will hurt the rate. Carbon may also combine with catalyst materials, causing embrittlement and There is also a risk of machine failure due to this. In a nitric acid reactor, the ridges are local parenchymal This leads to an increase in catalyst thickness, which causes variations in reaction rate and efficiency.

The catalyst pack layer may also be welded with ridges by diffusion welding, which reduces the cross-sectional area. is limited, further reducing catalyst efficiency. And each layer is free by welding. Movement will be restricted, resulting in even more serious chrysanthemum rolls.

Problems with woven gauze include the weaving method and the fact that the vertical and horizontal wires intersect at right angles. As a result, the mechanical strength inevitably becomes non-uniform. Also in the reactor It is also known that woven gauzes suffer from stress under the pressure of gas streams. Inside the reactor Expansion of gauze due to heat is also a serious problem. Many industrial oxidation reactions occur at high temperatures. As a result, conventional gauze deteriorates.

Yoimekin's gauze is simple and easy to produce, and is also reliable, fairly efficient, and economical. Despite the inconvenience, it is known as an economical industrial catalyst. Its use continues to expand. Despite this, research on improving catalysts and catalyst supports remains unclear. Exploration never ends. Technical sound speed is about substitution or replacement of precious metal gauze rather than in combination with conventional precious metal gauze and other known catalysts Our research focuses on new catalyst support materials made of non-precious metals. This responsibility body material relieves stress on traditional gauze and, in some cases, improves reaction efficiency. Aiming for the top.

The present invention was devised in view of this background. The present invention is a precious metal made by knitting method. It can be said that the genus can be understood in a broad concept regarding the production of gauze.

The present invention also relates to a knitted precious metal gauze body. Therefore, the present invention The present invention provides a knitted precious metal fabric useful as a getter material for catalyst recovery. child These knitted metal fabrics are particularly effective against ammonia oxidation, such as the formation of IWol and HCN. demonstrate.

Comparing the gauze production area per normal hour, the knitting machine once in operation is larger than the loom. It's quite fast. Knitted precious metal fabric takes less time to weave metal gauze using traditional methods Produced in 10 times the time. Therefore, the present invention enables production of catalyst and getter material. Production speed improves. In this way, the knitting method of the present invention and the knitting and weaving method using the knitting method The diseconomies of weaving are overcome, or at least alleviated, by fabricated products, and especially in metals. This eliminates the lock that was previously required for the production of precious metal catalysts and getter gauze. This eliminates the need for large investments.

Not only is the knitting method faster than the weaving method, but the knitting machine is also shorter than the loom. It can be assembled in no time and production can begin immediately. i.e. weaving wire into fabric It takes much less time to assemble a loom for knitting metal gauze than it does for a loom for knitting metal gauze. It can be done with Therefore, the equipment and initial operation required for catalyst and getter system production are The costs associated with this will be reduced.

A further advantage of the invention is that knitting machines are typically more flexible than looms. . The knitting machine can easily replace the constituent wires by simply replacing the wires that are supplied to the table. can be done. To replace a wire, you have to unhook a wide range of wires. Unlike old looms, knitting machines only supply new wire to replace old wire. That's fine. Similarly, different wires (e.g. alloys used, Knitted fabrics can be produced more easily by combining fibers with different diameters.

Usually, knitting machines can easily produce gauze with different characteristics. In particular, the knitting machine is circular, We can produce gauze in various shapes such as hexagons, so we are currently able to reduce the total weaving area to 25χ. The amount of bleed waste occupied is minimized.

Also, by simply feeding two or more wires in parallel to the knitting machine, the wire density of gauze can be adjusted. It is also possible to substantially increase the Compared to woven gauze, knitting machines require more knitted fabrics can be produced using thin wire.

According to the present invention, it is also possible to weave one, two or more wire ropes at the same time. . Thus, the density and number of wires can be adjusted or changed during knitted fabric production.

This is a getter system that often uses larger amounts of thinner wire than catalytic systems. Particularly effective for stems. When weaving gauze on a loom, these adjustments are made during production. It's not impossible, but it's quite difficult.

Furthermore, according to the present invention, it is possible to create gaps in the fabric that have different shapes depending on the stitches. . In traditional weaving methods, the gap is rectangular (square or rectangular), but with different weaving methods, The effective surface area of catalysts and getters is limited compared to the shapes and flow patterns that can be created visually. be done. The twist caused by knitting is more pronounced than in woven products with no twist. by increasing the density per volume of the catalyst and getter in a given clear area. is expanding.

Another advantage of the knitting method is that knitted gauze has larger gaps than woven gauze. It has great flexibility and flexibility, and is highly resistant to damage due to stress.

This flexibility makes knitted gauze more prone to warping due to thermal stress than woven gauze. Hateful. In particular, the fabric of the present invention has a tight weave structure, rather than the conventional loose weave. It has a natural structure, and does not produce the tortoise-shell ridges that are often seen in woven gauze. It can easily accommodate thermal expansion. Therefore, the HCN reaction using conventional woven gauze The problems of side effects and carbon deposition observed in the device are resolved.

The great thing about knitted fabrics in high-temperature environments is that they can absorb ammonia and methane. Considering the high temperature when producing hydrogen cyanide (I(CN)), It becomes clearer if you consider it. Therefore, the aspect specified by the present invention is The use of knitted fabrics as a catalyst in the production of hydrogen cyanide through the synthesis of carbon dioxide and methane. It is about use.

The present invention provides a knitted fabric made of precious metals or their alloys (hereinafter referred to as precious metals). provide. Especially waxes made of platinum, rhodium, palladium, and combinations thereof. The product produced in the year 2013 with an effective allocation for use as a catalyst or getter is used. used. Although the present invention includes any stitches, it is possible to Finished wire fabrics are particularly effective.

Tricot knitting is particularly effective when considering ease, production speed, and final product efficiency. It is fruitful. Tricot knitting creates many large twists surrounding the large hole, creating While the reaction gas passes through the fabric without back pressure problems, the catalyst and getter effectively distributed over the land.

Raschel and Jaka can be used to knit gauze with high density, high unit weight, and thickness. The technique of cord knitting is also effective.

According to the invention, knitted fabrics of any size can be manufactured using the capacity of existing knitting machines and industrial catalysts. It can be produced based on the size of the getter carrier. When using a rotary knitting machine, Usually 10" diameter tubes are most commonly produced, and up to 30" diameters are also available. It is also possible to produce Lay the woven tube flat in two layers up to 4 inches wide. Create a structural catalyst or getter. Or cut into strips up to 94 inches long. Layered catalyst or getter, or two single layer structures up to 4 fins each do. When using a warp knitting machine, single layer fabrics with a maximum of 200-1’ inch diameter can be produced. be done.

Of the two knitting machines used as examples for knitted gauze production, the rotary type and the vertical type, the current A vertical type is preferable. This is because the product finished using a rotating machine is a flat gauze. This is because reprocessing (for example, cutting or flattening) is required in order to This follow-up Processing operations increase production time and production costs. Furthermore, existing rotary knitting machines It is not possible to produce seamless (seamless gauze) that is sized to fit all reactors. The maximum diameter that can be produced using existing rotary knitting machines is 30" (0.76"). 2111), which is cut or flattened to approximately 94 mm. “('L39m) of gauze is produced.In contrast, existing warp knitting machines can produce up to Seamless, flat gauze with a width of 200” (5.08 m) can be produced, which is currently not possible. It is large enough to be used in the largest reactors in existence. Also, the warp knitting machine is Various knits, stitches, including jacquard knitting, raschel knitting, and tricot knitting, mesh is possible. As previously mentioned, excessive pressure drop may occur while using the mesh. Thanks to the mesh structure, a specific catalyst or trapping layer can be formed without restricting the gap. This allows for the incorporation of larger amounts of catalyst or getter material.

There may be particular benefits if the braided wire consists essentially of catalytic material. and This is because certain reactions, particularly the oxidation of ammonia, can cause loss of catalyst material due to volatilization. The loss is severe. Therefore, in a catalytic layer where the catalyst is simply coated on a non-catalytic material, structure and have no inherently catalytic properties (e.g. platinum coatings). (metal wire), the coating is eroded in a very short period of time due to catalyst loss and becomes non-touchable. The media will be exposed. Apparently, at this point the reaction is complete. On the other hand, essential For catalysts that have catalytic properties, even if erosion occurs, the catalytic material is exposed and The reaction continues until the substance is completely eliminated by food. i.e. essentially a catalyst Materials with such properties maximize the thickness of the reaction layer. For example, diameter 0.00 3” (0,0762JM11) Rh-Pt wire, there is a substantial reaction layer or The thickness of the catalyst material is Q, (1015" (0,0381 mm). Same thickness Even if you apply a Rh-Pt coating on the autocatalyst or the wire, the efficiency will be low. It's bad and just costs more.

The properties of the catalyst wire vary depending on how it is applied as a catalyst.

Usually, the wire is made of platinum or platinum-based metals (pgm) such as palladium, or is a pg1 alloy with a pgm content of 9α or more. Such a composition has many Used in reactions. For example, for nitrogen oxide or hydrogen cyanide production. Oxidation of ammonia - carbon oxides, hydrocarbons or carbons such as polychlorinated biphenyls Examples include oxidation of materials and reduction of nitrogen oxides and sulfur oxides. methanol acid For other applications such as oxidation, silver or silver alloys with a silver content of 75% or more are used. Use wire.

Experiments have shown that pgm alloys containing more than 80% platinum or palladium have excellent properties. It turns out that there is. For example, 90% platinum and 1Ox rhodium alloy, 90% Platinum and 5χ rhodium and 5% palladium alloy, palladium containing 85% platinum and rhodium alloys. Also, p of palladium and rhodium containing 60χ platinum It has been found that gm alloy is also effective.

Similarly, the knitted wire can be of any size, for example, 0.05ao-0 ,5- and preferably 0.055-0.1 m. The weight of the wire is The weight is 200-1000 grams.

Of course, it is also possible to use a combination of the above wires. For example - together or incorporated into different gauzes placed sequentially to create conditioning packs. (separate inert gauze, felt pads, woven scree between the layers of the puncture) ). My father used any of the above wires to transform The knitted gauze is wrapped in a catalytic mesh, and the appearance is essentially different from existing cartridges. It is also possible to create a cartridge without any. Knitted gauze is covered with an inert screen. may also be supported.

Knitting is particularly suitable for captive gauze production. All stitches disclosed herein are captured Jacquard knitting has a particularly good effect due to its three-dimensional structure. Geru. This means that each layer of jacquard material has considerable thickness and The subsequent gas takes more time to pass through the layer, improving the trapping effect. . For similar reasons, the catalytic effect of the catalytic layer is improved in jacquard-knitted materials.

Circular knitting machines and rotary knitting machines cannot provide sufficient radiance, but with regard to captured gauze, It's not that big of a problem. This is because, in certain applications, capture gauze The seams are placed so that they cannot be seen in the rack, so the presence of seams is not a big problem. It is. In fact, a tube-like knitted product can simply be folded into a clumped capture layer. It is also possible to form Circular knitting machines and rotary knitting machines offer excellent speed and flexibility. Therefore, this situation can be used without much trouble.

An additional benefit from the braiding process is that the properties of the wire (diameter, composition, etc.) The advantage is that it can be easily changed during work by simply replacing it with a new wire.

This allows different locations within the pack to be adapted to different conditions (e.g. material loss). It becomes easier to produce adjustment packs made from adjusted wire. Therefore, each layer is different. The layers of the adjustment pack can be continuously knitted even when knitted with wire .

Another advantage of the knitting method is that it does not require the formation of gauze layers or felt. Another point is that a catalyst pack can be produced with a desired thickness. Thanks to this production cost This reduces costs and minimizes the time required for costly placement. knitted The method is the same as that used to knit lace, and is added on top of already knitted or woven fabric. The filler material is woven to form a section having the desired thickness. The thickness of other layers One way to increase it is by creating a pile similar to velvet or velor.

The thickness of the knitted layer does not have to be uniform. For example, the center of a layer is thicker than the outside of the layer. You can also bring a smile. Due to this distribution, the stagnation of gas passing through the layer causes the formation of The center thickness is increased to equalize the gas residence time throughout the layer. form a layer as well It is also possible to change the catalytic effect of the entire layer by changing the thickness of each individual wire. It is.

Furthermore, increasing the thickness at the edges of the layer (not necessarily IWl), often observed at the edges It is also possible to prepare for possible erosion. At the moment, we are using the reinforcement patch (next). The end of the catalyst pack has been repaired and reinforced.

Of course, it is possible to have thick edges and a thick center, or to form layers. It is also possible to provide wires with different thicknesses and combine layers with different thicknesses. be.

Embodiments and aspects of the invention will be described by way of example only and with reference to the figures.

Figure 1 shows a conventional woven gar that is effective as a catalyst or getter system for ammonia oxidation. FIG.

FIG. 2 is a partial cross-sectional view of a single-sided knitted fabric produced by an L-bar type warp knitting machine according to the present invention. .

Figure 4 shows a knitted fabric finished by a warp knitting machine using whisker needles operating simultaneously. .

Figure 5 shows a section of a preferred tricot knitted fabric finished on a Meyer warp knitting machine. FIG.

FIG. 6 is a partial sectional view of net knitting by a two-bar Raschel knitting machine.

The knitted precious metal fabric according to the invention is composed of one or more wire ropes. It will be done. The mustard rope has a diameter of approximately 0.05 am - 0.10 lo. According to the present invention Typical knitted fabrics have a diameter of 0.06 am, 0.675 cm, and 0.76 tm. Contains wires of 0.09 m or a combination thereof. nothing. The wire may be constructed from any precious metal (including precious metal alloys). Shirokane Wa In particular, platinum alloys containing more than 50% platinum have shown excellent catalytic results. It was.

Representative alloys containing rhodium and palladium are shown in Table 1.

Composition of wire used in knitted metal fabric White, gold, rhodium, palladium 195χ 5χ 290% 5χ 5χ 3 Octopus 10% 492% day 5 9 passes 3.5χ 4.5χ 6 90-95% 2.5$ 2.5%797χ wave 875χ α 21χ If woven fabrics are required for the Getter system, palladium and palladium alloys may be used. Wires made of gold, especially palladium alloys containing more than 50% palladium, are preferred. Yes.

Certain knitting styles are particularly effective, including jacquard, raschel and tricot knitting. Demonstrate results. In these knitting methods, a large hole is surrounded by many large twists. , use of large amounts of wire in small spaces without clogging or back pressure problems becomes possible. Therefore, compared to traditional woven gauze, more catalyst in the same space Alternatively, getter materials can be used. As a result, reactions occur without affecting the flow of reactant gases. Increased efficiency.

The structure of conventional woven gauze is shown in Figure 1. These gauzes have a very simple structure. The small ropes (a, b) overlap each other at right angles, but there are no loops or edits. Eyes, not twisted or tied. The knitted material may be, for example, as shown in FIG. It is also quite different from that of relatively simple single-sided knitted fabrics produced by l-bar warp knitting machines.

For double-sided longitudinal fabrics (with loops in two directions), traditional woven gauze and the book shown in Figure 3 The difference becomes more apparent in the structure and complexity of the invented knitted precious metal fabric.

In fact, considering the somewhat brittle nature and high price of precious metal wire, does not seem to be able to adequately produce braided precious metal catalyst and getter systems. It was The complexity of knitting compared to weaving can lead to damage, uneven finishes, and difficulty adjusting. Knitting is impractical, expensive, bulky and time consuming compared to weaving. It was believed that the However, according to the present invention, the precious metal wire It has been found that it can be woven into a fabric that is stronger and structurally superior to conventional woven gauze.

In addition, knitted fabrics are subject to damage and quality control issues more quickly than woven gauze. It was also found that production could be carried out without any problems.

According to the present invention, a machine including a straight knitting machine, a circular knitting machine, a rotary knitting machine and a warp knitting machine can be used. Conventional knitting machines can also be used to produce the knitted gauze of the present invention. large fabrics quickly Machines that use multiple needles are preferred, and warp knitting machines are advantageous in this respect. It was also found to be particularly good. Meyer warp knitting machine using stockinette needles An example of the noble metal fabric of the present invention is shown in FIG.

In addition to separate catalyst and getter fabrics, the present invention includes the use of a single catalyst material and getter material. Also included are getter catalyst fabrics woven into blended fibers. For example, mainly platinum A single woven fabric is made by knitting a catalytic rope with a catalytic rope and a getter rope mainly made of palladium. Create. The fabric also acts as a catalyst for the oxidation of ammonia and recovers it. Immediate recovery of volatile catalytic materials (such as platinum) that would otherwise be lost. Therefore, the book One embodiment of the invention includes a novel material that allows a single fabric to serve two purposes. nothing. Such fabrics do not require downstream getter gauze, which was previously required. . According to aspects of the invention, the catalyst is constructed in a knitted manner and the system is assembled into a single fabric. By storing the metal, metal loss is suppressed at or around the loss source. For example, Weave a single continuous fabric with alternating lengths of catalyst and getter systems, Finally, the catalyst and getter layers are placed side by side and alternately as desired by folding. For example, it can be packaged in a different shape. The resulting getter catalyst is useful Supplied as a single cartridge.

The invention is also suitable for knitting conditioning packs. Overlap the adjustment pack while adjusting it. The same efficiency can be achieved while reducing weight.

In another embodiment, the fabric is made by weaving ropes of varying thickness along the length of the material. It is being produced. The fabrics created in this way cannot be produced by conventional weaving. stomach. This is because the knitting machine can easily change the thread size at any position on the loom. This is because it cannot be done. One of the excellent products according to the invention is a thinner wire. using thicker wire at the top and thicker wire at the bottom to create a strong pyramid-shaped structure. Examples include precious metal knitted fabrics. This thick section can be turned upside down. Wire wires at the same location are adjusted according to the degree of metal loss expected for the device in the bag. You may also create an adjustable bag by adjusting the thickness of the layer.

Prior to producing the knitted precious metal fabric according to the present invention, conventional weaving methods and traditional fabrics are used. Problems that did not arise with the knitting method had to be solved. wire child Unlike weaving, which does not have wire loops, twists, or knots, the knitting method Draw a tight loop with the rope, and the needle passed through the other rope passes through it. Make a loop knit. Initially, attempts to knit precious metals using numerous knitting machines, The attempt ended in failure due to a series of wire threads being damaged and getting jammed and caught. The finish is The textile products that were made were uneven and unsatisfactory. Experiment through trial and error As a result of repeating this process, platinum, rhodium, and palladium with a thickness of 0.05-0.10 as were obtained. It has been found that knitted precious metal fabrics can be produced by using a noble metal alloy of umum. this If necessary, the wire can be made slippery on the knitting machine with a non-toxic lubricant, or temporarily You may also use a feed thread to guide the wire. When using a feed thread temporarily, It is preferable to use a copper alloy thread that can be removed by corrosion after knitting.

In some cases, the operating speed of the knitting machine may be reduced below the speed at which it normally knits fabrics or non-precious metals. The need arises. Preferred lubricants include atomized starch and atomized wax. can be mentioned. Even when the speed is reduced, metal fabrics with good slippage can be used on conventional looms. It can be finished 10 times faster than weaving catalytic gauze.

Knitting machines with individually working needles or stockinette needles working simultaneously can also be used. Straight knitting machines, circular knitting machines, and warp knitting machines can also be used; Use is recommended. The knitted metal fabric of the present invention can be used in either the length or the radius direction of the fabric. A loop may be formed along the line. A warp knitting machine has a large amount of parallel yarns flowing in the vertical direction. Threaded by more than one needle bar, multiple needles operating simultaneously. These threads simultaneously The loop is brought down around the needle so that a stitch is formed across the width of the needle. Piece Both side and double-sided knitted fabrics can be produced, but single-sided fabrics such as tricot knitted fabrics can be produced. It is easier to produce.

The invention is illustrated by several examples. These examples are illustrative only; It is not intended to limit the scope of the dependent claims.

"Example 1" The knitted fabric of the present invention can be used to make a 40 x 40 wire S-type knitting pattern. – produced by a warp knitting machine. An example is shown in FIG. However, the knitting machine Modifications may be made to create the desired mold. Square or rectangular depending on the stitch chosen shape or other shapes can be formed. For production of knitted catalyst and getter fabrics The optimal Meyer machine has a radius of 84 inches at 50-100 feet per hour (length )210 inch fabric can be knitted. According to the present invention, it is preferable to use the Meyer machine as shown in FIG. This is a tricot knit shown in the figure.

Diameter 0.003 inches (0,076■), composition 90%Pt5%Rh -5χP The wire of d was knitted into a 36 inch long fabric on an 84 inch machine. misty Use starch to make the wire slippery, and use a tension adjuster to adjust the wire to match the actual knitting. The fabric was finished in a neat manner. 2-bar one work, strong and durable The best quality and flexible knitting was completed, but the 1-ba-1 work is better. , is somewhat quick and easy.

For example, for vertical tricot knitting, the length is 11 x 13 inches, the weight is 53.6 g, The finished fabric has a density of 583 g/m2 and can be used as a catalyst and getter.

"Example 2" As shown in Figure 6, the Rasiel knitting machine is used for net knitting using a two-bar structure. be done.

"Example 3" A method for making knitted precious metal fabrics into net knitted sealed tubes and sock-like materials. Finished with a Tex circular or rotary knitting machine. Tritex machine has a maximum diameter (capital) inch tubes are produced, and the tubes are cut into thin strips to create a one-layer structure. 94 inches, or a two-layer woven product with a width of 4 inches.

The Tritex machine produces knitting patterns of up to 25 x 30 wires and is relatively easy to use. The woven product is finally finished. Tritex fabric has a diameter of 0.003 inches. , a wire having a composition of lαRh-Pt was used. (capital) using an inch machine. 33 feet per hour would be produced.

“Implementation N 4J A knitted metal fabric was produced by a ram circular knitting machine. In this example, a 10-inch A machine is used to run the precious metal wire along with a polyester lead thread to create a loop. Prevents wire breakage and damage during loop formation. In this way multiple wires You can knit the ropes at the same time. Nylon, cotton, rayon, etc. can also be used as the lead thread. Ru. The lead string should be removed prior to use or during the final flame activity of the material, or at the time of initial use. Can be decomposed or incinerated on site. The tube-shaped fabric in this example has a radius of 1-3/4 inch. The length was 15-3/8 inches, the weight was 14.5 g, and the density was 418 g/m2. . Density can be increased/reduced by the number of needles or by adding/subtracting wire ropes. You can change it by

Figure 1 Figure 3 Figure 5 Continuation of front page (81) Designated countries EP (AT, BE, CH, DE.

DK, ES, FR, GB, GR, IT, LU, NL, SE), 0A (B F, BJ, CF, CG, CI, CM, GA, GN, ML, MR, SN, TD, T G), AT, AU, BB, BG, BR, CA, CH, C3, DE, D K.

ES, FI, GB, HU, JP, KP, KR, LK, LU, MC, M G, MN, MW, NL, No, PL, RO, SD, SE, SU, US

Claims (1)

[Claims] 1. A knitted fabric product made of precious metal wire. 2 Consisting of jacquard, raschel, tricot knitting, or a combination of the above The knitted fabric product of claim 1. 3. The knitted fabric product according to claim 1 or 2, the thickness of which is non-uniform. 4. The knitted fabric product according to claim 3, the thickness of which increases from the outside toward the center. Ru. 5. The knitted fabric product according to claim 3 or 4, wherein the ends thereof are thicker. 6 In the knitted fabric products of all the claims above, the side edges are not parallel in the state before cutting. . 7. The knitted fabric product of all the above claims, the density of which is non-uniform. 8. The knitted fabric product of all the above claims, the wire properties of which are non-uniform. 9. The knitted fabric product according to claim 8, wherein the different characteristics include wire diameter or braiding method. is included. 10. The knitted fabric product according to all of the above claims, comprising a catalyst wire and a getter wire. It is configured. 11. The knitted fabric product according to claim 10, wherein the catalyst wire is mainly made of platinum, and the getter -The wire is mainly made of palladium. 12. In the knitted textile products of all the preceding claims, the precious metal wire is essentially a catalytic material. It is. 13 Catalysts, getters or gamers for knitted fabric products specified in all the claims above Use as a terminating catalyst. 14 Catalyst, getter or Products resulting from use as getter catalysts. 15 Combining ammonia and methane of the knitted fabric products specified in claims 1 to 12 Used when producing hydrogen cyanide. 16. Using the knitted fabric product specified in claims 1 to 12 to produce ammonia and medicinal Hydrogen cyanide produced by synthesizing tan. 17 In the catalyst bag consisting of multiple layers, at least one layer is as defined in claim 1. A catalyst pack that is a knitted fabric product according to any of Item 12. 18. The catalyst pack of claim 17, wherein the layers are formed by a continuous knitting operation. 19. The catalyst pack of claim 18, wherein the layer is formed by folding a single knitted fabric product. It will be done. 20. The catalyst pack according to claims 17 to 19, wherein the wire characteristics are different for each layer. 21 Catalyst pack containing at least one hidden catalyst or capture layer The prepared catalyst or capture layer consists of a precious metal knitted fabric product made on a rotary knitting machine. be done. 22. The catalyst pack of claim 21, wherein the hidden catalyst or capture layer comprises a plurality of rotating layers. It is composed of the following products. 23. In the catalyst pack of claim 21 or 22, the hidden catalyst or capture layer is It is a knitted fabric product that is folded and bundled together. 24 A method for manufacturing precious metal textiles, from knitting precious metal wires together using a knitting machine. Become. 25. In the manufacturing method of claim 24, the precious metal wire is used before and during the knitting operation. smoothen. 26. In the manufacturing method according to claim 24 or 25, the knitting machine is a warp knitting machine. 27. In the manufacturing method of claims 24 to 26, the width of the knitted product from the knitting machine is changed. , to produce a knitted product in which the side edges of the knitted product before cutting are not parallel, such as a circular shape. Ru. 28. In the manufacturing method according to claims 24 to 27, the thickness of the knitted product is changed, and the thickness is Create a non-uniform knitted product. 29 In the manufacturing method of claims 24 to 28, the characteristics of the wire are changed during the weaving operation. do. 30 In the manufacturing method according to claims 24 to 29, the number of wires supplied to the knitting machine is changed. Changing the density of loose knit products. A method for manufacturing a catalyst pack formed of 31 layers, in which the layers of the pack are knitted in a continuous operation, The knitted product is then folded to produce a catalyst pack formed of layers. 32. In the manufacturing method of claim 31, the wire characteristics of each layer are changed so that the layers have different characteristics. Manufacture a pack that has.