A high-cycle adsorption-desorption fuel vapor carbon adsorbent and its preparation method

Abstract

This invention discloses a high-cycle adsorption-desorption fuel vapor activated carbon adsorbent and its preparation method. The preparation method includes: mixing biomass raw materials, phosphoric acid, and high-nitrogen substances in a certain proportion; stirring in a mixer at an oil bath temperature of 230°C until slightly matured; dispersing the matured mixture using a dispersion device; activating it in an externally heated activation converter by introducing a mixture of nitrogen and hydrogen gas; rinsing the activated mixture and recovering the phosphoric acid to obtain high-nitrogen activated carbon; drying the high-nitrogen activated carbon; grinding the high-nitrogen activated carbon; mixing carbon powder and gel in a mass ratio of 2:1 to maintain the moisture content of the mixture at 30%; granulating using a screw granulator; and drying and solidifying the obtained granules. This invention improves the activated carbon adsorbent by reducing the proportion of hydrophilic oxygen-containing functional groups, increasing the hydrophobicity of the activated carbon, and thus extending its service life.

Description

Technical Field

[0001] This invention relates to the field of carbon adsorbent technology, specifically to a high-cycle adsorption-desorption fuel vapor carbon adsorbent and its preparation method. Background Technology

[0002] Fuel, widely used in industrial and automotive sectors, is primarily divided into gasoline and diesel. Especially in the automotive industry, with the increasing prevalence of automobiles, gasoline-powered vehicles still account for a significant proportion. Therefore, it is necessary to control the volatilization of fuel vapors to prevent excessive release into the atmosphere and the resulting environmental pollution.

[0003] Currently, the main approach to addressing the above issues is to use carbon adsorbents to adsorb fuel vapors. However, while adsorbing fuel vapors, carbon adsorbents also absorb moisture. As a result, after prolonged use, the accumulation of moisture inside the carbon adsorbent leads to a decrease in its heat exchange capacity (BWC) and a significant reduction in its lifespan.

[0004] In view of this, the applicant conducted in-depth research on the above-mentioned issues, which led to this case. Summary of the Invention

[0005] The main objective of this invention is to provide a high-cycle adsorption-desorption fuel vapor carbon adsorbent and its preparation method. The carbon adsorbent is improved by reducing the proportion of hydrophilic oxygen-containing functional groups in the carbon adsorbent, increasing the hydrophobicity of the carbon adsorbent, and thus improving the service life of the carbon adsorbent.

[0006] To achieve the above objectives, the solution of the present invention is:

[0007] A method for preparing a highly cyclic adsorption-desorption fuel vapor carbon adsorbent includes the following steps:

[0008] (1) Mix biomass raw materials, phosphoric acid and high-nitrogen substances in proportion and stir in a mixer with an oil bath temperature of 200-240℃ until slightly cooked.

[0009] (2) After the matured mixture is dispersed by a dispersion device, it is put into an externally heated activation converter and activated by a mixture of nitrogen and hydrogen at a temperature of 700-900℃.

[0010] (3) The activated mixture is rinsed and phosphoric acid is recovered to obtain high nitrogen-containing activated carbon;

[0011] (4) Dry the high nitrogen-content activated carbon to reduce its moisture content to less than 5%;

[0012] (5) Grind the high nitrogen-containing activated carbon to obtain carbon powder with a particle size of 300-500 mesh;

[0013] (6) Mix the charcoal powder and gel in a mass ratio of 2:1, so that the moisture content of the mixture is 20-40%;

[0014] (7) Granulate using a screw granulator; granulation diameter 2.1-2.5 mm, cut length 4-5 mm;

[0015] (8) The obtained granules are dried and cured.

[0016] Furthermore, the biomass raw material is one of wood flour, bamboo flour, walnut shell powder, or lignin.

[0017] Furthermore, the high-nitrogen substance is one of urea, melamine, or amino acids.

[0018] Furthermore, the mass-to-volume ratio of biomass raw materials, phosphoric acid, and high-nitrogen substances is 2KG:3L:0.5KG.

[0019] Furthermore, in step (2), nitrogen accounts for 70%.

[0020] Furthermore, the externally heated activation converter includes a frame, a heating box, a converter body, a feed pipe, a discharge pipe, a converter drive mechanism, and a stirring assembly. The heating box, converter drive mechanism, feed pipe, and discharge pipe are fixedly installed on the frame. The converter body is rotatably connected to the heating box. Ventilation holes are provided on the side wall of the converter body. The two ends of the converter body are rotatably connected to the feed pipe and the discharge pipe. Spiral plates are provided on the inner side walls of both ends of the converter body. The converter drive mechanism drives the converter body to rotate. The stirring assembly is installed inside the converter body. The stirring assembly stirs the material inside the converter body and introduces activation gas.

[0021] Furthermore, the stirring assembly includes a first motor, a fixed bracket, a rotating shaft, a stirring frame, a return spring, an adapter sleeve, and a drive sleeve. The fixed bracket is installed on the feed pipe and the discharge pipe. The first motor is installed on the fixed bracket at one end of the discharge pipe. The two ends of the rotating shaft are rotatably connected to the feed pipe and the discharge pipe, respectively. The power output shaft of the first motor is connected to the rotating shaft via a spline. The drive sleeve is connected to the fixed bracket and sleeved on the power output shaft of the first motor. The adapter sleeve is fixedly sleeved on the end of the rotating shaft. The drive sleeve is provided with a support column, and the support column is provided with a roller. The side wall of the adapter sleeve near the drive sleeve is provided with a guide boss. The guide boss has a wavy guide surface. The roller abuts against the guide surface. The return spring is sleeved on the side of the rotating shaft near the feed pipe. The two ends of the return spring abut against the fixed bracket and the rotating shaft, respectively. The stirring frame is installed on the rotating shaft and is provided with a stirring plate. The interior of the rotating shaft is provided with an air passage, and the side wall of the rotating shaft is provided with an air outlet.

[0022] Furthermore, the stirring frame includes an annular frame, a sliding sleeve, a first connecting rod, and a second connecting rod. The inner wall of the converter body is provided with an annular groove, and the annular frame is connected to the annular groove. The inner wall of the annular frame is provided with several mounting bosses. The sliding sleeve is fixedly sleeved on the rotating shaft. One end of the first connecting rod is hinged to the sliding sleeve, and the other end of the first connecting rod is connected to the stirring plate. One end of the second connecting rod is hinged to the mounting bosses, and the other end of the second connecting rod is hinged to the middle of the first connecting rod.

[0023] Furthermore, the converter drive mechanism includes a second motor, a drive wheel, a driven wheel, and a transmission chain. The second motor is mounted on the frame, the drive wheel is located on the power output shaft of the second motor, the driven wheel is sleeved on the converter body, and the transmission chain is wound around the drive wheel and the driven wheel.

[0024] A high-cycle adsorption-desorption fuel vapor carbon adsorbent is prepared by the above-described method.

[0025] Compared with existing technologies, the beneficial effects of this invention are as follows: By introducing a high proportion of nitrogen-containing groups and activating the carbon adsorbent at high temperatures with nitrogen gas, a large number of oxygen-containing groups on the surface of the carbon adsorbent are detached, reducing the proportion of hydrophilic oxygen-containing functional groups on the surface of the carbon adsorbent, thereby increasing the porosity of the carbon activator and thus improving the hydrophobicity and service life of the carbon material itself. Furthermore, this invention uses an externally heated activation converter for high-temperature activation of the carbon adsorbent. During activation, the material is thoroughly stirred by a stirring component, allowing it to fully contact and activate with nitrogen gas, further increasing the decomposition of oxygen-containing groups, achieving efficient activation production, and improving the product quality of the carbon adsorbent. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the preparation method of the present invention.

[0027] Figure 2 This is a three-dimensional schematic diagram of the external structure of an externally heated activation converter.

[0028] Figure 3 This is a schematic cross-sectional view of an externally heated activation converter.

[0029] Figure 4 for Figure 2 A magnified view of a portion of region A in the middle.

[0030] Figure 5 This is a three-dimensional schematic diagram of the external structure of the mixing rack.

[0031] In the diagram: 1. Frame; 2. Heating box; 3. Converter body; 3. Vent hole; 31. Spiral plate; 32. Annular groove; 33. Feed pipe; 41. Discharge pipe; 42. Converter drive mechanism; 5. Second motor; 51. Drive wheel; 52. Driven wheel; 53. Transmission chain; 54. Stirring assembly; 6. First motor; 61. Fixed bracket; 62. Rotating shaft; 63. Air passage; 631. Vent hole; 632. Stirring frame; 64. Annular frame; 641. Sliding sleeve; 642. First connecting rod; 643. Second connecting rod; 644. Mounting boss; 645. Return spring; 65. Adapter sleeve; 66. Guide boss; 661. Drive sleeve; 67. Support column 671 with rollers 672; 68. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] Lignin, phosphoric acid, and urea were mixed in a mass-volume ratio of 2KG:3L:0.5KG and stirred in a mixer at an oil bath temperature of 230℃ until slightly matured. The matured mixture was dispersed by a dispersion device and then put into an externally heated activation converter. A mixture of nitrogen and hydrogen was introduced for activation, with nitrogen accounting for 70% and the activation temperature being 700℃.

[0035] The activated mixture was rinsed and phosphoric acid was recovered to obtain high-nitrogen activated carbon. The high-nitrogen activated carbon was dried to reduce its moisture content to less than 5%. The high-nitrogen activated carbon was ground to obtain carbon powder with a particle size of 500 mesh. The carbon powder and gel were mixed in a mass ratio of 2:1 to maintain the moisture content of the mixture at 30%. Granulation was carried out using a screw granulator with a granulation diameter of 2.3 mm and a cutting length of 4.5 mm. The obtained granules were dried and solidified to obtain a high-circulation adsorption-desorption fuel vapor carbon adsorbent.

[0036] Example 2

[0037] Lignin, phosphoric acid, and urea were mixed in a mass-volume ratio of 2 kg:3 L:0.5 kg and stirred in a mixer at an oil bath temperature of 230°C until slightly matured. The matured mixture was dispersed by a dispersion device and then fed into an externally heated activation converter. A mixture of nitrogen and hydrogen gas was introduced for activation, with nitrogen accounting for 70% of the mixture, at an activation temperature of 800°C. The activated mixture was then rinsed and the phosphoric acid was recovered to obtain high-nitrogen activated carbon. The high-nitrogen activated carbon was dried to reduce its moisture content to below 5%. The high-nitrogen activated carbon was then ground to obtain carbon powder with a particle size of 500 mesh. The carbon powder and gel were mixed in a mass ratio of 2:1 to maintain a moisture content of 30%. The mixture was granulated using a screw granulator with a granulation diameter of 2.3 mm and a cutting length of 4.5 mm. The resulting granules were dried and solidified to obtain a high-circulation adsorption-desorption fuel vapor carbon adsorbent.

[0038] Example 3

[0039] Lignin, phosphoric acid, and urea were mixed at a mass-volume ratio of 2 kg:3 L:0.5 kg and stirred in a mixer at an oil bath temperature of 230°C until slightly matured. The matured mixture was dispersed by a dispersion device and then fed into an externally heated activation converter. A mixture of nitrogen and hydrogen was introduced for activation, with nitrogen accounting for 70% of the mixture, at an activation temperature of 900°C. The activated mixture was then rinsed and the phosphoric acid was recovered to obtain high-nitrogen activated carbon. The high-nitrogen activated carbon was dried to reduce its moisture content to below 5%. The high-nitrogen activated carbon was then ground to obtain carbon powder with a particle size of 500 mesh. The carbon powder and gel were mixed at a mass ratio of 2:1 to maintain a moisture content of 30%. The mixture was granulated using a screw granulator with a granulation diameter of 2.3 mm and a cutting length of 4.5 mm. The resulting granules were dried and solidified to obtain a high-circulation adsorption-desorption fuel vapor carbon adsorbent.

[0040] Comparative Example 1

[0041] Lignin and phosphoric acid were mixed at a mass-to-volume ratio of 2 kg:3 L and stirred in a mixer at an oil bath temperature of 230°C until slightly matured. The matured mixture was dispersed by a dispersion device and then placed in an externally heated activation converter, where air was introduced for activation at a temperature of 900°C. The activated mixture was rinsed and the phosphoric acid was recovered to obtain activated carbon. The activated carbon was dried to reduce its moisture content to below 5%. The activated carbon was then ground to obtain carbon powder with a particle size of 500 mesh. The carbon powder and gel were mixed at a mass ratio of 2:1 to maintain a moisture content of 30%. The mixture was granulated using a screw granulator with a granulation diameter of 2.3 mm and a cutting length of 4.5 mm. The resulting granules were dried and solidified to obtain the carbon adsorbent.

[0042] The specific surface area and contact angle of Examples 1-3 and Comparative Example 1 were tested. The carbon adsorbents prepared according to Examples 1-3 and Comparative Example 1 were subjected to BWC testing (ASTM-D5228). The test results are shown in Table 1.

[0043] Example 1 Example 2 Example 3 Comparative Example 1 Porosity (cc / g) 0.86 0.88 0.91 0.70 Contact angle (°) 75 78 82 58 BWC (g / dl) 15.1 14.8 15.2 12.5 Desorption rate (%) 88.5 89.8 88.6 79.5

[0044] Table 1

[0045] Based on the experimental data in Table 1, the carbon adsorbents in Examples 1-3, by introducing a high proportion of nitrogen-containing groups and activating them at high temperatures with nitrogen gas, significantly reduce the porosity of the carbon adsorbent by removing a large number of oxygen-containing groups from its surface, thereby increasing the proportion of hydrophilic oxygen-containing functional groups on the carbon adsorbent surface. This, in turn, improves the hydrophobicity and lifespan of the carbon material itself. Furthermore, the hydrophobicity of the carbon adsorbent improves with increasing activation temperature.

[0046] like Figure 2-5 As shown, to ensure sufficient contact and activation of the material with the activating gas, the externally heated activation converter of this invention includes a frame 1, a heating chamber 2, a converter body 3, a feed pipe 41, a discharge pipe 42, a converter drive mechanism 5, and a stirring assembly 6. The heating chamber 2, the converter drive mechanism 5, the feed pipe 41, and the discharge pipe 42 are fixedly mounted on the frame 1. The heating chamber 2 is equipped with a conventional electric heating device, and an exhaust pipe is located at the top of the heating chamber 2, which is connected to the waste gas treatment equipment. The converter body 3 and the heating chamber 2 are rotatably connected by bearings or annular slide rails. The side wall of the converter body 3 is provided with a vent hole 31, and a breathable membrane is provided on the vent hole 31, allowing the gas generated after the activation reaction to be discharged into the heating chamber 2 through the vent hole 31, and then flow to the waste gas treatment equipment for tail gas treatment through the exhaust pipe. The converter body 3 is sealed and rotatably connected to the feed pipe 41 and the discharge pipe 42 at both ends. The upper end of the feed pipe 41 has a feed port for material to enter the converter body 3, and the lower end of the discharge pipe 42 has a discharge hole for the activated material to be discharged. A rotating shaft 63 has a spiral pusher inside the discharge pipe 42 to facilitate material transport. Spiral plates 32 are provided on the inner sidewalls at both ends of the converter body 3. The converter drive mechanism 5 drives the converter body 3 to rotate, and during rotation, the spiral plates 32 push the material forward. A stirring assembly 6 is installed inside the converter body 3. The stirring assembly 6 stirs the material inside the converter body 3 and introduces activation gas.

[0047] In this embodiment, the stirring assembly 6 includes a first motor 61, a fixed bracket 62, a rotating shaft 63, a stirring frame 64, a return spring 65, an adapter sleeve 66, and a drive sleeve 67. The fixed bracket 62 is fixedly installed on the feed pipe 41 and the discharge pipe 42. The first motor 61 is installed on the fixed bracket 62 at one end of the discharge pipe 42. The two ends of the rotating shaft 63 are rotatably connected to the feed pipe 41 and the discharge pipe 42, respectively, and the rotating shaft 63 can translate along the axial direction. The power output shaft of the first motor 61 is connected to the rotating shaft 63 via a spline, so that the rotating shaft 63 can also move horizontally along the axial direction of the converter body 3 during rotation. A drive sleeve 67 is fixedly mounted on a fixed bracket 62 and is sleeved on the outside of the power output shaft of the first motor 61. A transition sleeve 66 is fixedly sleeved on the end of the rotating shaft 63. A support column 671 is provided on the drive sleeve 677, and a roller 672 is provided on the support column 671. A guide boss 661 is provided on the side wall of the transition sleeve 66 near the drive sleeve 67. The guide boss 661 has a wavy guide surface. The roller 672 abuts against the guide surface. A return spring 65 is sleeved on the side of the rotating shaft 63 near the feed pipe 41. The two ends of the return spring 65 abut against the fixed bracket 62 and the rotating shaft 63, respectively. A stirring rack 64 is mounted on the rotating shaft 63 and has a stirring plate 68. An air passage 631 is provided inside the rotating shaft 63, and an air outlet 632 is provided on the side wall of the rotating shaft 63. The air passage 631 of the rotating shaft 63 is rotatably connected to the air supply pipe of an external air supply device. With the above structure, the activation gas enters the interior of the rotating shaft 63 through the air passage 631, and then enters the interior of the converter body 3 through the gas outlet 632, where it comes into contact with the material. Next, the first motor 61 drives the rotating shaft 63 to rotate, causing the stirring frame 64 and stirring plate 68 to rotate, thus stirring the material inside the converter body 3. This ensures that the material can fully contact the activation gas. During the rotation of the rotating shaft 63, the adapter sleeve 66 rotates along with it. Under the elastic force of the return spring 65, the roller 672 remains in contact with the guide surface, allowing the rotating shaft 63 to move horizontally along the axial direction due to the contact with the roller 672 during rotation.

[0048] In this embodiment, the stirring frame 64 includes an annular frame 641, a sliding sleeve 642, a first connecting rod 643, and a second connecting rod 644. The inner wall of the converter body 3 is provided with an annular groove 33. The annular frame 641 is connected to the annular groove 33, so that the annular frame 641 can be rotatably connected to the converter body 3. The inner wall of the annular frame 641 is provided with a plurality of mounting bosses 645. The sliding sleeve 642 is fixedly sleeved on the rotating shaft 63. One end of the first connecting rod 643 is hinged to the sliding sleeve 642, and the other end of the first connecting rod 643 is connected to the stirring plate 68. One end of the second connecting rod 644 is hinged to the mounting bosses 645, and the other end of the second connecting rod 644 is hinged to the middle of the first connecting rod 643. With the above structure, when the rotating shaft 63 rotates, it drives the sliding sleeve 642 to rotate, which in turn drives the annular frame 641, the first connecting rod 643, the second connecting rod 644, and the stirring plate 68 to rotate together. During the rotation, as the rotating shaft 63 translates along the axial direction, it drives the two sliding sleeves 642 to move horizontally at the same time. This allows the lower end of the first connecting rod 643 to swing back and forth, while driving the stirring plate 68 to swing up and down. This allows the stirring plate 68 to better and more fully stir the material, preventing the material from accumulating and agglomerating inside the converter body 3, increasing the contact area between the material and the activation gas, and making the activation more complete, further improving the hydrophobic properties of the product.

[0049] In this embodiment, the converter drive mechanism 5 includes a second motor 51, a drive wheel 52, a driven wheel 53, and a transmission chain 54. The second motor 51 is mounted on the frame 1, the drive wheel 52 is located on the power output shaft of the second motor 51, the driven wheel 53 is sleeved on the converter body 3, and the transmission chain 54 is wound around the drive wheel 52 and the driven wheel 53. With the above structure, the second motor 51 drives the drive wheel 52 to rotate, which in turn drives the driven wheel 53 and the converter body 3 to rotate through the transmission chain. The converter body 3 rotates in the opposite direction to the rotating shaft 63, allowing the material to be fully stirred.

[0050] A high-cycle adsorption-desorption fuel vapor carbon adsorbent is prepared by the above-described method.

[0051] The above embodiments and figures are not intended to limit the product form and style of the present invention. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims

1. A method for preparing a high cycle adsorption-desorption fuel vapor carbon adsorbent, characterized by, It comprises the following steps: (1) mixing the biomass raw material, phosphoric acid and high-nitrogen substance in proportion, and stirring in an oil bath temperature of 200-240 DEG C to a slightly cooked state; (2) after the slightly cooked mixture is dispersed by a dispersion device, it is put into an external heating type activation converter, and a mixed gas of nitrogen and hydrogen is introduced for activation, and the activation temperature is 700-900 DEG C; (3) the activated mixture is rinsed and the phosphoric acid is recovered to obtain high-nitrogen activated carbon; (4) the high-nitrogen activated carbon is dried to make the moisture content less than 5%; (5) the high-nitrogen activated carbon is ground, and the particle size of the obtained carbon powder is 300-500 mesh; (6) the carbon powder is mixed with gel in a mass ratio of 2:1, and the moisture content of the obtained mixture is 20-40%; (7) granulating with a screw granulator; the granulating diameter is 2.1-2.5 mm, and the cutting length is 4-5 mm; (8) the obtained granules are dried and solidified; The high-nitrogen substance is one of urea, melamine or amino acid. The external heating type activation converter comprises a rack, a heating box, a converter main body, a feeding pipe, a discharging pipe, a converter driving mechanism and a stirring assembly, the heating box, the converter driving mechanism, the feeding pipe and the discharging pipe are fixedly installed on the rack, the converter main body is rotationally connected with the heating box, the side wall of the converter main body is provided with an air hole, the two ends of the converter main body are rotationally connected with the feeding pipe and the discharging pipe, the inner side wall of the two ends of the converter main body is provided with a spiral plate, the converter driving mechanism drives the rotation of the converter main body, the stirring assembly is installed inside the converter main body, and the stirring assembly stirs the materials in the converter main body and introduces activation gas; the stirring assembly comprises a first motor, a fixed support, a rotating shaft, a stirring frame, a return spring, a adapter sleeve and a driving sleeve, the fixed support is installed on the feeding pipe and the discharging pipe, the first motor is installed on the fixed support at one end of the discharging pipe, the two ends of the rotating shaft are rotationally connected with the feeding pipe and the discharging pipe, the power output shaft of the first motor is connected with the rotating shaft through a spline, the driving sleeve is connected with the fixed support and is sleeved on the power output shaft of the first motor, the adapter sleeve is fixedly sleeved on the end of the rotating shaft, the driving sleeve is provided with a supporting column, the supporting column is provided with a roller, the side wall of the adapter sleeve close to the driving sleeve is provided with a guide boss, the guide boss has a wave-shaped guide surface, the roller is in abutting contact with the guide surface, the return spring is sleeved on the side of the rotating shaft close to the feeding pipe, and the two ends of the return spring are in abutting contact with the fixed support and the rotating shaft, the stirring frame is installed on the rotating shaft, the stirring frame is provided with a stirring plate, the inside of the rotating shaft is provided with an air passage, and the side wall of the rotating shaft is provided with an air outlet.

2. A method of making a high cycle adsorption and desorption fuel vapor carbon adsorbent according to claim 1, wherein, The biomass raw material is one of wood powder, bamboo powder, walnut shell powder or lignin.

3. The method of claim 1, wherein the fuel vapor carbon adsorbent is prepared by the steps of: The mass-volume ratio of the biomass raw material, phosphoric acid and high-nitrogen substance is 2 kg:3 L:0.5 kg.

4. The method of claim 1, wherein the fuel vapor carbon adsorbent has a high cyclic adsorption and desorption of fuel vapor. The proportion of nitrogen in step (2) is 70%.

5. The method for preparing a high-cycle adsorption-desorption fuel vapor carbon adsorbent as described in claim 1, characterized in that, The stirring frame comprises an annular frame, a sliding sleeve, a first connecting rod and a second connecting rod, the inner side wall of the converter body is provided with an annular groove, the annular frame is connected with the annular groove in a matched mode, a plurality of mounting bosses are arranged on the inner side wall of the annular frame, the sliding sleeve is fixedly sleeved on the rotating shaft, one end of the first connecting rod is hingedly connected with the sliding sleeve, the other end of the first connecting rod is connected with the stirring plate, one end of the second connecting rod is hingedly connected with the mounting boss, and the other end of the second connecting rod is hingedly connected with the middle part of the first connecting rod.

6. The method for preparing a high-cycle adsorption-desorption fuel vapor carbon adsorbent as described in claim 1, characterized in that, The converter driving mechanism comprises a second motor, a driving wheel, a driven wheel and a transmission chain, the second motor is installed on the frame, the driving wheel is arranged on the power output shaft of the second motor, the driven wheel is sleeved on the converter body, and the transmission chain is wound on the driving wheel and the driven wheel.

7. A high cycle adsorption-desorption fuel vapor carbon adsorbent characterized by, made by the method of any one of claims 1-6.

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