A motorcycle catalyst coating process and catalytic converter

Abstract

The present invention relates to the technical field of motorcycle catalytic converters, and in particular to a motorcycle catalyst coating process and a catalytic converter. A motorcycle catalyst coating process is used for the catalyst coating of a motorcycle catalytic converter, the catalytic converter comprising a cylindrical outer shell and a carrier assembled inside the outer shell, the carrier being an integrated structure, the carrier comprising an inner ring carrier and an outer ring carrier. The motorcycle catalyst coating process comprises the following steps: using a slurry containing precious metal active ingredients to coat the carrier, the precious metal coating amount of the outer ring carrier is 1.5 to 2.5 times the precious metal coating amount of the inner ring carrier. The motorcycle catalyst coating process has a simple and convenient coating process, does not require the carrier to be assembled in sections, reduces the input amount of precious metal in the inner ring, has low production costs, improves the utilization rate of precious metals, and solves the technical problems of complex manufacturing and assembly processes and high costs caused by the existing use of segmented carriers.

Description

Technical Field

[0001] The invention relates to the technical field of motorcycle catalytic converters, and in particular to a motorcycle catalyst coating process and a catalytic converter. Background Art

[0002] A large amount of working condition emission data in the early stage showed that the CO and NMHC (non-methane total hydrocarbon) emissions during the warm-up process after the motorcycle was started were the largest, accounting for 40%-55% of the total working condition. Therefore, reducing pollutant emissions during the warm-up process has become the focus of reducing vehicle pollutant emissions. When the engine exhaust enters the catalyst, the difference in gas flow rate will make the catalyst center flow faster. Because the combustion reaction of the catalyst and CO in the exhaust gas releases a lot of heat, the temperature of the catalyst center rises sharply and gradually transfers heat to the radial and axial directions. After a certain period of time, the temperature of the entire catalyst is basically consistent. For motorcycle Euro IV emissions, when the catalyst temperature reaches 300-400 degrees in the working condition test, the catalyst has a good conversion rate. However, for motorcycle Euro 5+ catalyst temperature, NMHC must reach above 400℃ in about 60s of the test condition to have a good conversion rate. Therefore, prompting the catalyst to ignite quickly is the key to dealing with Euro 5+ emissions. Catalyst industry engineers have greatly improved its activity by changing the catalyst particle size and formula, so that the catalyst can ignite quickly during the warm-up process.

[0003] Patent CN204691872U discloses an assembled motorcycle exhaust gas purification converter. The carrier is divided into three parts: the front inner ring, the front outer ring, and the rear carrier. The three parts of the carrier are coated with catalysts respectively and then assembled by spinning packaging. Since the front inner ring and outer ring of this scheme have more precious metals and the rear section has less precious metals, and the mesh number of the front inner ring and outer ring is greater than the mesh number of the rear section carrier, this scheme can also play a good catalytic conversion ability during the warm-up process. However, the disadvantages of this scheme are also obvious. The separate processing, separate coating, and later spinning assembly of the three parts of the carrier will result in high costs, and the manufacturing and assembly processes are complicated. Summary of the invention

[0004] In response to the problems raised in the background technology, the purpose of the present invention is to propose a motorcycle catalyst coating process. The coating process is simple and convenient, does not require the carrier to be assembled in sections, reduces the input of precious metals in the inner ring, has low production costs, improves the utilization rate of precious metals, and solves the technical problems of complex manufacturing and assembly processes and high costs brought about by the existing use of segmented carriers.

[0005] Another object of the present invention is to provide a catalytic converter made using the above motorcycle catalyst coating process.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A motorcycle catalyst coating process is used for the catalyst coating of a motorcycle catalytic converter, wherein the catalytic converter comprises a cylindrical shell and a carrier assembled inside the shell, wherein the carrier is an integrated structure, and comprises an inner ring carrier and an outer ring carrier, wherein the outer ring carrier is an annular cylinder, and the inner ring carrier is cylindrical, and the motorcycle catalyst coating process comprises the following steps:

[0008] A slurry containing precious metal active ingredients is used to coat the carrier, so that the precious metal coating amount of the outer ring carrier accounts for 50-75% of the total precious metal coating amount, the precious metal coating amount of the inner ring carrier accounts for 25-50% of the total precious metal coating amount, and the precious metal coating amount of the outer ring carrier is 1.5-2.5 times the precious metal coating amount of the inner ring carrier.

[0009] To further illustrate, the volume of the outer ring carrier accounts for 25-55% of the total volume of the carrier, and the volume of the inner ring carrier accounts for 45-75% of the total volume of the carrier.

[0010] To further illustrate, the precious metal coating amount of the outer ring carrier is 10 to 37.5 g / cubic foot, and the precious metal coating amount of the inner ring carrier is 4 to 25 g / cubic foot.

[0011] It is further explained that the amount of precious metal coating on the outer ring carrier is 1.8 to 2.5 times the amount of precious metal coating on the inner ring carrier.

[0012] Further, the motorcycle catalyst coating process includes the following steps:

[0013] The outer ring carrier region is sealed, and the inner ring carrier region is coated with a slurry containing a precious metal active component;

[0014] The region of the inner ring carrier is sealed, and the region of the outer ring carrier is coated with a slurry containing precious metal active components.

[0015] Further, the motorcycle catalyst coating process includes the following steps:

[0016] Applying a slurry containing a precious metal active component to the region of the outer ring carrier and the region of the inner ring carrier;

[0017] The region of the inner ring carrier is sealed, and a solution containing a noble metal active component is coated on the region of the outer ring carrier.

[0018] Further, the diameter of the catalytic converter is 45 to 75 mm;

[0019] When the diameter of the catalytic converter is in the range of 45 to 63.5 mm, the wall thickness of the housing is 1 mm;

[0020] When the diameter of the catalytic converter is in the range of 63.5 to 75 mm, the wall thickness of the shell is 1.5 mm.

[0021] A catalytic converter is produced using the motorcycle catalyst coating process.

[0022] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0023] The motorcycle catalyst coating process of the present invention uses the carrier with an integrated structure to coat the catalyst on inner and outer rings, and the precious metal coating amount of the outer ring carrier is greater than the precious metal coating amount of the inner ring carrier. After appropriately reducing the precious metal coating amount of the inner ring, the inner ring can still quickly ignite and react, thereby shortening the overall ignition time of the catalyst. This reduces costs and improves precious metal utilization due to reduced precious metal input into the inner ring, thereby increasing the motorcycle exhaust emission conversion rate while reducing the amount of precious metal used. The integrated carrier makes the coating process simple and convenient, and there is no need to assemble the carrier in sections, thereby avoiding the problems of complex manufacturing and assembly processes and high costs caused by the use of segmented carriers. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram (top view) of a catalytic converter according to an embodiment of the present invention.

[0025] Figure 2 This is a physical picture of the catalytic converter used for coating according to Examples 1 and 2 of the present invention.

[0026] Figure 3 This is a schematic diagram of coating in step 3 of Example 1 of the present invention.

[0027] Figure 4 This is a schematic diagram of using an inner ring pressure head mold to seal the inner ring carrier area of ​​the present invention.

[0028] Figure 5 This is a schematic diagram of using an outer ring pressure head mold to seal the outer ring carrier area of ​​the present invention.

[0029] Figure 6 This is a temperature comparison chart before the catalyst carrier.

[0030] Figure 7 This is a temperature comparison chart after the catalyst carrier.

[0031] Figure 8 This is a comparison chart of the temperature difference before and after the catalyst carrier.

[0032] Among them: catalytic converter 1, outer shell 2, carrier 3, inner ring carrier 31, outer ring carrier 32. DETAILED DESCRIPTION

[0033] like Figure 1As shown, a motorcycle catalyst coating process is used for the catalyst coating of a motorcycle catalytic converter 1, wherein the catalytic converter 1 comprises a cylindrical outer shell 2 and a carrier 3 assembled inside the outer shell 2, wherein the carrier 3 is an integrated structure, wherein the carrier 3 comprises an inner ring carrier 31 and an outer ring carrier 32, wherein the outer ring carrier 32 is an annular cylinder, and the inner ring carrier 31 is cylindrical, wherein the motorcycle catalyst coating process comprises the following steps:

[0034] A slurry containing precious metal active ingredients is used to coat the carrier 3, so that the precious metal coating amount of the outer ring carrier 32 accounts for 50-75% of the total precious metal coating amount, the precious metal coating amount of the inner ring carrier 31 accounts for 25-50% of the total precious metal coating amount, and the precious metal coating amount of the outer ring carrier 32 is 1.5-2.5 times the precious metal coating amount of the inner ring carrier 31.

[0035] The motorcycle catalyst coating process of the present invention uses the carrier 3 of the integrated structure to coat the catalyst in the inner and outer rings, and the precious metal coating amount of the outer ring carrier 32 is greater than the precious metal coating amount of the inner ring carrier 31. Since the CO and NMHC emissions are the largest during the warm-up process, and NMHC needs to reach a temperature of 400°C before it can be converted, the temperature can only be increased by relying on CO to quickly ignite. The precious metals platinum and palladium have good oxidation activity for CO. Platinum or palladium is coated on the surface of the outer ring carrier 32 alone, and the probability of CO in the high-temperature exhaust gas contacting platinum or palladium at the moment of passing through the outer ring of the catalyst is greatly increased. At this moment, CO is fully burned, and the overall heat transfer time is shortened due to the doubling of the heat released. After the overall ignition time of the catalyst is shortened, the gas flow rates of the inner and outer rings tend to the same pressure in a short time, and the temperature reaches above 400°C and less than 60 seconds. Compared with the motorcycle Euro 4 working condition emission, the NMHC ignition temperature is reached in advance and reacts normally. The improvement of the conversion rate of CO and NMHC during the warm-up process promotes the overall working condition emission to meet the motorcycle Euro 5+ emission regulations. Since the high-temperature exhaust gas of the engine reaches the inner ring of the catalyst first, the inner ring can still quickly ignite and react after the amount of precious metal coating on the inner ring is appropriately reduced, thereby shortening the overall ignition time of the catalyst. This reduces the cost by reducing the amount of precious metal input into the inner ring, improves the utilization rate of precious metals, and improves the exhaust emission conversion rate of motorcycles while reducing the amount of precious metals used. The one-piece carrier 3 makes the coating process simple and convenient, and there is no need to assemble the carrier in sections, thus avoiding the problems of complex manufacturing and assembly processes and high costs caused by the use of segmented carriers.

[0036] To further illustrate, the volume of the outer ring carrier 32 accounts for 25-55% of the total volume of the carrier 3 , and the volume of the inner ring carrier 31 accounts for 45-75% of the total volume of the carrier 3 .

[0037] To further illustrate, after conversion into mass units, the amount of precious metal coating on the outer ring carrier 32 is 10 to 37.5 g / cubic foot, and the amount of precious metal coating on the inner ring carrier 31 is 4 to 25 g / cubic foot.

[0038] Preferably, the amount of precious metal coating on the outer ring carrier 32 is 1.8 to 2.5 times that of the inner ring carrier 31. When the amount of precious metal coating on the outer ring carrier 32 is 1.8 to 2.5 times that of the inner ring carrier 31, the emission data is optimal. When the amount of precious metal coating on the outer ring carrier 32 exceeds 2.5 times that of the inner ring carrier 31, the overall ignition time of the catalyst gradually lags, which is not conducive to overall emissions.

[0039] In one embodiment of the present invention, the motorcycle catalyst coating process adopts a non-overlapping coating method, and the motorcycle catalyst coating process includes the following steps:

[0040] The area of ​​the outer ring carrier 32 is sealed, and the area of ​​the inner ring carrier 31 is coated with a slurry containing a precious metal active component;

[0041] The region of the inner ring carrier 31 is sealed, and the region of the outer ring carrier 32 is coated with a slurry containing precious metal active components.

[0042] In another embodiment of the present invention, the motorcycle catalyst coating process adopts an overlapping coating method, and the motorcycle catalyst coating process includes the following steps:

[0043] A slurry containing a precious metal active component is applied to the region of the outer ring carrier 32 and the region of the inner ring carrier 31;

[0044] The region of the inner ring carrier 31 is sealed, and a solution containing a noble metal active component is coated on the region of the outer ring carrier 32 .

[0045] The advantage of adopting the non-overlapping coating method is that the precious metal can be evenly and stably dispersed in the slurry coated on the inner ring carrier 31 and the outer ring carrier 32, the catalyst stability is good, and the experimental endurance mileage is higher than that of the overlapping coating method. The disadvantage is that the ignition speed is slightly slower than that of the overlapping coating method, and it is not suitable for large-displacement vehicles.

[0046] The overlapping coating method requires the preparation of an inner ring slurry and an outer ring precious metal solution. The inner ring slurry is first applied to the entire carrier 3, and then the area of ​​the inner ring carrier 31 is sealed, and then the outer ring precious metal solution is applied. The advantage of overlapping coating is that the precious metal platinum or palladium coated on the outer ring adheres to the surface of the coating. Since the ignition speed is slightly faster than that of the non-overlapping coating method, the conversion rate is also slightly higher than that of the non-overlapping coating method, which is more suitable for some models with large displacement. The disadvantage is that the precious metal of the outer ring adheres to the surface and is not evenly distributed inside the outer ring coating. The experimental endurance mileage is slightly lower than that of the non-overlapping coating method.

[0047] Specifically, Figure 4 As shown, the inner ring pressure head mold can be used to block the area of ​​the inner ring carrier 31. The inner ring pressure head mold is a cylindrical structure. The contact end of the inner ring pressure head mold and the inner ring carrier 31 is equipped with a rubber pad with a thickness of 3 to 5 mm, and the other end is designed with a slot for easy fixation on the coating machine. Figure 5 As shown, the outer ring pressure head mold is an annular columnar structure, and the contact end between the outer ring pressure head mold and the outer ring carrier 32 is equipped with a rubber pad with a thickness of 3 to 5 mm.

[0048] Preferably, the diameter of the catalytic converter 1 is 45 to 75 mm;

[0049] When the diameter of the catalytic converter 1 is within the range of 45 to 63.5 mm, the wall thickness of the housing 2 is 1 mm;

[0050] When the diameter of the catalytic converter 1 is in the range of 63.5 to 75 mm, the wall thickness of the housing 2 is 1.5 mm.

[0051] Specifically, the diameter of the inner ring carrier 31 is 25 to 60 mm, and the diameter of the outer ring carrier 32 is 40 to 72 mm. The diameters of the inner ring carrier 31 and the outer ring carrier 32 and their specific ratios need to be determined with reference to the original engine emission values.

[0052] A catalytic converter is produced using the motorcycle catalyst coating process.

[0053] In order to facilitate the understanding of the present invention, the present invention is described more fully below. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0054] If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the field or the product instructions are used. If no manufacturer is specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0055] Take the KD125-L model as an example, using a 53*120(50+50)300LS type carrier, the diameter of the catalytic converter is 53mm, the thickness of the shell is 1mm, the effective diameter of the carrier is 51mm, the effective length of the carrier is 100mm, and the effective total volume is 204.2ml. Use an inner ring pressure head mold with an inner ring diameter of 35mm. The volume of the inner ring pressure head mold control part is 96.1625ml, and the volume of the outer ring area is equal to 108.0375ml. Figure 2 As shown, the coating area of ​​the inner ring carrier is the cylindrical area with a center diameter of 35 mm of the carrier, that is, Figure 2 The area enclosed by the middle circle has a volume of 96.1625 ml, and the outer ring carrier is the remaining annular area except the center, that is, Figure 2 The volume of the carrier area outside the middle circle, the area of ​​the outer ring carrier, is 108.0375 ml.

[0056] Example 1 (Overlapping coating of inner and outer rings)

[0057] Step 1: inner ring slurry processing. The active precious metal components in the slurry are mixed oxides of platinum and rhodium in a ratio of 8:1. After conversion into mass units, the inner ring precious metal coating amount is 4.96 g / cubic foot, accounting for 31% of the total precious metal coating amount, and the precious metal mass fraction is 0.1165%.

[0058] Step 2, preparation of outer ring solution. The active precious metal component in the solution is an ionic compound of palladium. After conversion into mass units, the outer ring precious metal palladium usage is 11.04 g / cubic foot, accounting for 69% of the total precious metal coating amount, which is 2.23 times the inner ring precious metal coating amount. The auxiliary materials are acetic acid, nitric acid and deionized water.

[0059] Step 3: Coat the entire inner ring without using a press head mold, such as Figure 3 As shown, the inner ring slurry is coated on the entire carrier, with a total volume of 204.2 ml, a total amount of slurry coated on one carrier of 88±2.6 grams, a solid content of 30.7±0.9 grams, and a mass fraction of precious metal of 0.1165%.

[0060] Step 4: Drying, tunnel dryer, temperature 105-120℃, 15-17 minutes from front to end. Calcination, transfer to box-type resistance furnace, from room temperature to 550℃ for about 3.5 hours, keep warm for 60 minutes, cool down, take out and cool to room temperature after it is below 200℃.

[0061] Step 5, outer ring coating, use the inner ring pressure head mold to block the area of ​​the inner ring carrier on the end face of the carrier, the volume of the area blocked by the inner ring pressure head mold is 96.1625mm. The outer ring area is coated with material, the area width of the outer ring carrier is 8mm, and the volume is equal to 108.0375ml. The ionic compound solution containing palladium is coated on the outer ring carrier, the solution coating amount is 24.2±0.3 grams per carrier, and the mass fraction of palladium solid in the solution is 0.329%.

[0062] Step 6: Drying, tunnel dryer, temperature 105-120℃, 15-17 minutes from front to end. After roasting, transfer to box-type resistance furnace, heat from room temperature to 550℃ for about 3.5 hours, keep warm for 60 minutes, cool down, take out and cool to room temperature after it is below 200℃, and the inner and outer ring overlapping coating process is completed.

[0063] Example 2 (Inner and outer rings are coated without overlap)

[0064] Step 1, inner ring slurry processing, the precious metal active component in the slurry is a mixed oxide of platinum and rhodium, the ratio is 8:1, after conversion into mass units, the inner ring precious metal coating amount is 4.96 grams / cubic foot, accounting for 31% of the total precious metal coating amount. The difference from Example 1 is the coating volume, the volume of the inner ring carrier with overlapping coating is 204.2ml, and the volume of the inner ring carrier without overlapping coating is 96.1625ml. The area of ​​the inner ring carrier is a cylindrical area with a central diameter of 35mm. The auxiliary materials are reduced accordingly according to the proportion of the coating volume, the amount of precious metal remains unchanged, and the mass fraction of precious metal is 0.2466%.

[0065] Step 2, outer ring slurry processing, the precious metal active component of the slurry is a palladium compound. After conversion into mass units, the outer ring precious metal palladium usage is 11.04 g / cubic foot. It accounts for 69% of the total precious metal coating amount, which is 2.23 times the inner ring precious metal coating amount. The difference from Example 1 is that the former is a precious metal solution, and here a slurry containing other solid auxiliary materials is made, the slurry coating amount is 46.6±0.6 grams, the solid content is 16.175 grams, and the mass fraction of precious metal palladium solids in the slurry is 0.492%.

[0066] Step 3: Inner ring coating: Use the outer ring pressure head mold to block the outer ring carrier area of ​​108.0375 ml volume on the end surface of the carrier, and coat the inner ring slurry on the inner ring carrier area of ​​96.1625 ml volume. The total amount of the carrier coating slurry is 41.5±1.2 grams, the solid content is 14.5±0.5 grams, and the mass fraction of precious metal is 0.2466%.

[0067] Step 4, drying, tunnel dryer, temperature 105-120 ℃, from the front end to the end takes 15-17 minutes, after cooling to room temperature, no baking is required, and the outer ring slurry coating is carried out.

[0068] Step 5: Coating the outer ring. Use the inner ring pressure head mold to block the inner ring carrier at the end face of the carrier. The area volume of the inner ring carrier blocked by the inner ring pressure head is 96.1625mm. Coat the outer ring area. The width of the outer ring area is 8mm and the volume is equal to 108.0375ml. Coat the outer ring slurry containing palladium to the area of ​​the outer ring carrier. The coating slurry volume is 46.6±0.6 grams, and the mass fraction of precious metal palladium solid is 0.492%

[0069] Step 6: Drying, tunnel dryer, temperature 105-120℃, 15-17 minutes from front to end. Firing, transfer to box-type resistance furnace, from room temperature to 550℃ for about 3.5 hours, keep warm for 60 minutes, cool down, take out and cool to room temperature after it is below 200℃, and the non-overlap coating process is finished.

[0070] Emission tests and operating temperature comparisons were conducted on a blank carrier, using a conventional coating method (overall coating, i.e., the distribution of the amount of precious metal at each point on the coating is the same) and a distributed coating method of the motorcycle catalyst coating process (Example 1, distributed coating, i.e., the inner ring precious metal accounts for 31% of the whole, and the outer ring precious metal accounts for 69% of the whole. The distribution of the amount of precious metal in the inner and outer rings of the coating is different).

[0071] The emission test results are shown in Table 1 below:

[0072] Table 1 Emission test results

[0073]

[0074] From the analysis of the emission test results, the CO: 582.1 mg / km value of the step-coated catalyst (Example 1) is higher than the CO: 271.9 mg / km value of the conventional coated catalyst, while the THC (total hydrocarbons in vehicle emissions): 32.6 mg / km value and NOx: 9.1 mg / km value of the step-coated catalyst (Example 1) are lower than the THC: 60.1 mg / km value and NOx: 32.3 mg / km value of the conventional coated catalyst.

[0075] like Figures 6 to 8 As shown, from the temperature difference before and after the catalyst carrier, it can be seen that the temperature difference before and after the step-coated catalyst (Example 1) is smaller, the inlet temperature is slightly lower, the outlet temperature is slightly higher, and the exhaust pressure drop is lower than the conventional coated catalyst. The Euro 5+ regulatory limits are very strict for THC, NOx, and NMHC values. The step-coated catalyst (Example 1) has better THC and NOx conversion rates in emission tests than conventional coated catalysts.

[0076] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A motorcycle catalyst coating process, characterized in that: Catalyst coating for a catalytic converter of a motorcycle, the catalytic converter comprises a cylindrical shell and a carrier assembled inside the shell, the carrier is an integrated structure, the carrier comprises an inner ring carrier and an outer ring carrier, the outer ring carrier is an annular cylinder, the inner ring carrier is cylindrical, the motorcycle catalyst coating process comprises the following steps: A slurry containing precious metal active ingredients is used to coat the carrier, so that the precious metal coating amount of the outer ring carrier accounts for 50-75% of the total precious metal coating amount, the precious metal coating amount of the inner ring carrier accounts for 25-50% of the total precious metal coating amount, and the precious metal coating amount of the outer ring carrier is 1.5-2.5 times the precious metal coating amount of the inner ring carrier.

2. The motorcycle catalyst coating process according to claim 1, characterized in that: The volume of the outer ring carrier accounts for 25-55% of the total volume of the carrier, and the volume of the inner ring carrier accounts for 45-75% of the total volume of the carrier.

3. The motorcycle catalyst coating process according to claim 1, characterized in that: The precious metal coating amount of the outer ring carrier is 10 to 37.5 g / cubic foot, and the precious metal coating amount of the inner ring carrier is 4 to 25 g / cubic foot.

4. The motorcycle catalyst coating process according to claim 1, characterized in that: The amount of precious metal coating on the outer ring carrier is 1.8 to 2.5 times the amount of precious metal coating on the inner ring carrier.

5. The motorcycle catalyst coating process according to claim 1, characterized in that: The motorcycle catalyst coating process comprises the following steps: The outer ring carrier region is sealed, and the inner ring carrier region is coated with a slurry containing a precious metal active component; The region of the inner ring carrier is sealed, and the region of the outer ring carrier is coated with a slurry containing precious metal active components.

6. The motorcycle catalyst coating process according to claim 1, characterized in that: The motorcycle catalyst coating process comprises the following steps: Applying a slurry containing a precious metal active component to the region of the outer ring carrier and the region of the inner ring carrier; The region of the inner ring carrier is sealed, and a solution containing a noble metal active component is coated on the region of the outer ring carrier.

7. The motorcycle catalyst coating process according to claim 1, characterized in that: The diameter of the catalytic converter is 45 to 75 mm; When the diameter of the catalytic converter is in the range of 45 to 63.5 mm, the wall thickness of the housing is 1 mm; When the diameter of the catalytic converter is in the range of 63.5 to 75 mm, the wall thickness of the shell is 1.5 mm.

8. A catalytic converter, characterized in that: The motorcycle catalyst coating process is used to prepare the motorcycle catalyst coating process as described in any one of claims 1 to 7.

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