JP2022064481A - Exhaust emission control device - Google Patents

Abstract

To effectively remove NOx while suppressing power consumption.SOLUTION: An exhaust emission control device according to an embodiment includes: a first treatment unit which is provided in an exhaust passage and includes an adsorbent; a second treatment unit which is provided in the exhaust passage on the downstream side of the first treatment unit and includes a selective reduction catalyst and a carrier; a first temperature sensor which measures a temperature of exhaust gas introduced into the first treatment unit; a second temperature sensor which measures a temperature of exhaust gas introduced into the second treatment unit; a reductant supply device which supplies a reductant to the second treatment unit; a heating part which heats the second treatment unit; and a control device which controls the heating part and heats the second treatment unit when the temperature of the exhaust gas measured by the first temperature sensor is equal to or higher than a first temperature threshold and the temperature of the exhaust gas measured by the second temperature sensor is equal to or lower than a second temperature threshold.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to an exhaust gas purification device.

Exhaust gas purification devices that purify exhaust gas from engines are known. For example, in the following cited document 1, an exhaust passage through which exhaust gas from an engine flows, a urea injection valve for injecting urea into the exhaust passage, and an SCR catalyst provided on the downstream side of the urea injection valve in the exhaust passage are described. An exhaust gas purification device comprising an electrically heated metal honeycomb provided in an exhaust passage between a urea injection valve and an SCR catalyst is described.

Generally, in a urea SCR system, when the temperature of exhaust gas is low, urea water cannot be thermally decomposed to produce ammonia as a reducing agent, and nitrogen oxides (NOx) cannot be purified. On the other hand, in the apparatus described in Cited Document 1, the exhaust gas flowing through the exhaust passage is heated by the electric heating type metal honeycomb at the cold start of the engine to promote the thermal decomposition of urea water and accelerate the SCR catalyst. Is activated.

International Publication No. 2018/147369

However, in the apparatus described in Cited Document 1, since the low-temperature exhaust gas immediately after the cold start is heated to a temperature at which urea water can be decomposed by the electric heating type metal honeycomb, a large amount of electric energy is consumed immediately after the engine is started. It will be.

Therefore, there is a demand for an exhaust gas purification device capable of effectively removing NOx while suppressing power consumption.

The exhaust purification device according to one aspect is a first processing unit provided in an exhaust passage through which exhaust gas discharged from an exhaust gas flows, and an adsorbent that adsorbs nitrogen oxides (NOx) contained in the exhaust gas. The first processing unit and the second processing unit provided in the exhaust passage on the downstream side of the first processing unit, which include a selective reduction catalyst and a selective reduction catalyst for reducing NOx contained in exhaust gas. The second processing unit including the carrier to be carried, the first temperature sensor for measuring the temperature of the exhaust gas introduced into the first processing unit, and the exhaust gas introduced into the second processing unit. A second temperature sensor that measures the temperature, a reducing agent supply device that supplies the reducing agent to the second processing unit, a heating unit that heats the second processing unit, and an exhaust gas measured by the first temperature sensor. When the temperature of the gas is equal to or higher than the first temperature threshold and the temperature of the exhaust gas measured by the second temperature sensor is equal to or lower than the second temperature threshold, the heating unit is controlled to control the second processing unit. It is equipped with a control device for heating.

In the exhaust gas purification device of the above aspect, when the temperature of the exhaust gas immediately after starting the engine is low, NOx contained in the exhaust gas can be removed by adsorbing it to the adsorbent contained in the first processing unit. Here, the NOx adsorbed on the adsorbent is desorbed from the adsorbent as the temperature of the exhaust gas rises, but if the selective reduction catalyst contained in the second treatment unit is not activated, the desorbed NOx Cannot be removed by the selective reduction catalyst of the second treatment unit, and the amount of NOx released may increase. On the other hand, in the exhaust purification device, the temperature of the exhaust gas introduced into the first processing unit is equal to or higher than the first temperature threshold, and the temperature of the exhaust gas introduced into the second processing unit is measured. When the temperature of the exhaust gas to be discharged is equal to or lower than the second temperature threshold, the second processing unit is heated by the heating unit. As a result, when the temperature of the exhaust gas introduced into the first treatment unit rises and NOx is desorbed from the adsorbent, the selective reduction catalyst can be heated and activated at an early stage. Therefore, the amount of NOx emissions can be suppressed. Further, when the temperature of the exhaust gas introduced into the first processing unit becomes equal to or higher than the first temperature threshold value, the temperature of the exhaust gas introduced into the second processing unit also rises to some extent. It is possible to suppress the power consumption for activating the processing unit of 2. Therefore, according to the exhaust gas purification device, NOx can be effectively removed while suppressing power consumption.

In one embodiment, the heating unit may include a power adjusting unit that energizes the carrier to generate heat. By energizing and heating the carrier using the power adjusting unit, the selective reduction catalyst supported on the carrier can be efficiently heated and activated. In one embodiment, the carrier may be composed of silicon carbide.

In one embodiment, the heating unit may include an electric heater that heats the carrier. By heating the carrier of the second processing unit with an electric heater, the selective reduction catalyst carried on the carrier can be efficiently heated and activated. In one embodiment, the carrier may be composed of cordierite.

In one embodiment, the adsorbent may include rare earths, alkali metals or alkaline earth metals. By using rare earths, alkali metals or alkaline earth metals, it is possible to appropriately adsorb NOx contained in the exhaust gas.

In one embodiment, the adsorbent may further contain a noble metal. Further, the first processing unit may include a filter coated with an adsorbent.

According to one aspect of the present invention and various embodiments, NOx can be effectively removed while suppressing power consumption.

It is a figure which shows schematically the system including the exhaust gas purification apparatus which concerns on one Embodiment. It is a figure which shows the 2nd processing unit schematicly. It is a figure which shows the temperature of the 2nd processing unit after the engine start. It is a figure which shows the NOx emission amount after starting an engine. It is a figure which shows the power consumption for activating the second processing unit.

Hereinafter, various embodiments will be described in detail with reference to the drawings. In each drawing, the same or corresponding parts are designated by the same reference numerals, and duplicate explanations for the same or corresponding parts will be omitted. In the present specification, the terms "upstream" and "downstream" are used with reference to the flow direction of exhaust gas.

FIG. 1 is a diagram schematically showing a system including an exhaust gas purification device according to an embodiment. The exhaust gas purification device 30 shown in FIG. 1 is mounted on a large vehicle such as a bus or a truck and purifies the exhaust gas generated by the engine 10. The vehicle on which the exhaust gas purification device 30 is mounted may be, for example, a so-called series hybrid vehicle that uses the engine 10 as a power source for power generation. In this specification, nitric oxide (NO), nitrogen dioxide (NO ₂ ) and the like generated from the engine 10 are collectively referred to as nitrogen oxides (NOx).

The engine 10 is an internal combustion engine such as a diesel engine, and is driven when the remaining capacity of the battery 32, which will be described later, is low. The engine 10 includes a plurality of cylinders 10a. An intake manifold 12 that supplies air into the plurality of cylinders 10a and an exhaust manifold 13 that discharges exhaust gas from the plurality of cylinders 10a are connected to the plurality of cylinders 10a.

An intake passage 14 is connected to the intake manifold 12. The intake passage 14 is provided with a compressor 15 and an intercooler 16 in order from the upstream side of the intake air. An introduction pipe 17 into which intake air flows is connected to the compressor 15. The introduction pipe 17 is provided with an air cleaner 18.

An exhaust passage 20 is connected to the exhaust manifold 13 via a turbine 19. The turbine 19 is connected to the compressor 15 via a connecting shaft. The turbine 19 is rotated by the flow of exhaust gas discharged from the exhaust manifold 13 of the engine 10. The compressor 15 rotates with the rotation of the turbine 19, takes in air (intake) from the introduction pipe 17, and sends the compressed air to the intake passage 14. That is, the compressor 15 and the turbine 19 form a turbocharger. The air introduced into the intake passage 14 is introduced into the plurality of cylinders 10a through the intake manifold 12. The air introduced into the plurality of cylinders 10a is compressed in each cylinder 10a.

Further, a plurality of injectors 24 are provided at positions close to the plurality of cylinders 10a of the engine 10. The fuel supply path 23 is connected to the plurality of injectors 24. A fuel pump 22 is connected to the fuel supply path 23. The fuel pump 22 pumps fuel such as light oil stored in the fuel tank 21 to a plurality of injectors 24 via the fuel supply path 23. The plurality of injectors 24 inject the fuel supplied from the fuel tank 21 into the plurality of cylinders 10a, respectively.

The fuel from the injector 24 is burned in each cylinder 10a by being injected into the compressed air, and the piston arranged in each cylinder 10a is reciprocated in the cylinder 10a. The engine 10 is driven by the reciprocating motion of the piston.

A generator 31 is connected to the output shaft of the engine 10. The generator 31 generates electricity by driving the engine 10. The electric power generated by the generator 31 is supplied to the battery 32. The battery 32 is various secondary batteries such as a lithium ion battery, and stores the electric power generated by the generator 31. The battery 32 outputs the electric power required for the driving operation of the vehicle to the motor 33 via, for example, an inverter. The motor 33 receives electric power from the battery 32 to generate a driving force for driving the vehicle.

The exhaust gas purification device 30 includes a first processing unit 41 and a second processing unit 42. The first processing unit 41 is arranged on the upstream side of the exhaust passage 20, and includes, for example, a ceramic carrier and an adsorbent 51 supported on the carrier. The first processing unit 41 purifies the exhaust gas by adsorbing NOx contained in the exhaust gas on the adsorbent 51. As the adsorbent 51, for example, rare earths, alkali metals or alkaline earth metals are used. More specifically, as the material of the adsorbent 51, for example, calcium (Ca), magnesium (Mg), cerium (Ce) or sodium (Na) may be used. Further, the adsorbent 51 may further contain a noble metal such as platinum (Pt), palladium (Pd), or rhodium (Rh). This type of adsorbent 51 has a property that the amount of NOx adsorbed is high when the temperature is low, and the amount of NOx adsorbed decreases as the temperature rises. In particular, NOx adsorbed on the adsorbent 51 is rapidly desorbed from the adsorbent 51 when the temperature of the adsorbent 51 exceeds the desorption temperature (200 ° C.).

The second processing unit 42 is arranged on the downstream side of the first processing unit 41 in the exhaust passage 20. The second processing unit 42 includes a selective reduction catalyst 52 that reduces NOx using a reducing agent. Examples of the selective reduction catalyst 52 included in the second processing unit 42 include metal catalysts such as copper, iron, zeolite, and vanadium. The selective reduction catalyst 52 is activated, for example, at 200 ° C. or higher, and reduces NOx contained in the exhaust gas. The second processing unit 42 constitutes an SCR (Selective Catalytic Reduction) system together with the reducing agent supply device 45 described later.

As shown in FIG. 2, the second processing unit 42 further includes a carrier 53. The carrier 53 is a flow-through type or honeycomb type catalyst carrier, and a selective reduction catalyst 52 is carried inside the carrier 53. The carrier 53 is composed of, for example, silicon carbide (SiC) or cordierite. As shown in FIG. 2, a pair of electrodes 54 are attached to the surface of the carrier 53. The pair of electrodes 54 are, for example, silver or copper metal plates and are electrically connected to the carrier 53.

As shown in FIG. 1, the exhaust purification device 30 includes a power adjusting unit 35, a temperature sensor (first temperature sensor) 43, a temperature sensor (second temperature sensor) 44, a reducing agent supply device 45, a NOx sensor 48, and the like. Further, a control device 50 is provided. As shown in FIG. 2, the power adjusting unit 35 is connected to the pair of electrodes 54 via the conducting wire L. Further, the electric power adjusting unit 35 is electrically connected to the battery 32, and the electric power specified by the control signal from the control device 50 described later is transmitted through the pair of electrodes 54 to the carrier 53 of the second processing unit 42. Supply to. The carrier 53 itself generates heat when energized from the power adjusting unit 35, and heats the selective reduction catalyst 52 supported on the carrier 53. That is, the power adjusting unit 35 functions as a heating unit for heating the second processing unit 42.

The temperature sensor 43 is provided on the upstream side of the first processing unit 41 and measures the temperature of the exhaust gas introduced into the first processing unit 41. The temperature sensor 44 is provided between the first processing unit 41 and the second processing unit 42, and measures the temperature of the exhaust gas introduced into the second processing unit 42. The temperature sensor 43 and the temperature sensor 44 output information indicating the measured temperature of the exhaust gas to the control device 50.

The reducing agent supply device 45 injects a reducing agent for reducing NOx into the exhaust passage 20. For example, the reducing agent supply device 45 injects urea water stored in the reducing agent tank 46 into the exhaust passage 20 between the first treatment unit 41 and the second treatment unit 42. The urea water injected into the exhaust passage 20 is decomposed into ammonia by the heat of the exhaust gas, and is supplied to the second processing unit 42 together with the exhaust gas. Ammonia supplied to the second processing unit 42 reduces NOx contained in the exhaust gas on the selective reduction catalyst 52 contained in the second processing unit 42. The amount of urea water injected into the exhaust passage 20 by the reducing agent supply device 45 is controlled by a control signal from the control device 50.

The NOx sensor 48 is provided in the exhaust passage 20 between the first processing unit 41 and the second processing unit 42. The NOx sensor 48 measures the NOx concentration of the exhaust gas introduced into the second processing unit 42. The NOx sensor 48 outputs information indicating the measured NOx concentration of the exhaust gas to the control device 50.

The control device 50 is an electronic control unit having a CPU [Central Processing Unit], ROM [Read Only Memory], RAM [Random Access Memory], CAN [Controller Area Network] communication circuit, etc., and operates the entire exhaust purification device 30. To control. The control device 50 realizes various functions described later by, for example, loading a program stored in the ROM into the RAM and executing the program loaded in the RAM in the CPU.

The control device 50 is communicably connected to, for example, an engine 10, a battery 32, a power adjusting unit 35, a temperature sensor 43, a temperature sensor 44, a NOx sensor 48, and a reducing agent supply device 45. For example, the control device 50 acquires the remaining capacity of the battery 32, and drives the engine 10 to charge the battery 32 when the acquired remaining capacity is lower than a predetermined capacity. Further, the control device 50 acquires the temperature information of the exhaust gas measured by the temperature sensors 43 and 44, and controls the amount of the reducing agent supplied from the reducing agent supply device 45 based on the acquired temperature information. For example, when the temperature of the exhaust gas measured by the temperature sensor 44 reaches the activation temperature (for example, 200 ° C.), the control device 50 injects urea water from the reducing agent supply device 45. The amount of urea water ejected from the reducing agent supply device 45 is adjusted according to, for example, the NOx concentration of the exhaust gas measured by the NOx sensor 48.

Further, in the control device 50, the temperature of the exhaust gas measured by the temperature sensor 43 (that is, the temperature of the exhaust gas introduced into the first processing unit 41) is equal to or higher than the first temperature threshold value, and the temperature sensor When the temperature of the exhaust gas measured by 44 (that is, the temperature of the exhaust gas introduced into the second processing unit 42) is equal to or less than the second temperature threshold, the power adjusting unit 35 is controlled to perform the second processing. Power is supplied to the carrier 53 of the unit 42. The first temperature threshold is the temperature at which the desorption of NOx from the adsorbent 51 of the first processing unit 41 becomes active, for example, 200 ° C. The second temperature threshold is the activation temperature of the selective reduction catalyst 52, for example, 200 ° C. The first temperature threshold value and the second temperature threshold value may be different temperatures. For example, the first temperature threshold may be 200 ° C and the second temperature threshold may be 180 ° C. As described above, by supplying electric power to the carrier 53 of the second processing unit 42, the carrier 53 is energized and heated, and the selective reduction catalyst 52 supported on the carrier 53 is activated at an early stage.

On the other hand, in the control device 50, when the temperature of the exhaust gas measured by the temperature sensor 43 is lower than the first temperature threshold, or the temperature of the exhaust gas measured by the temperature sensor 44 is lower than the second temperature threshold. When the temperature is high, the heating of the second processing unit 42 is stopped. The control device 50 may control the temperature of the second processing unit 42 by PID control so that the temperature of the second processing unit 42 does not overshoot.

The operation and effect of the exhaust gas purification device 30 described above will be described. As described above, the first processing unit 41 of the exhaust gas purification device 30 contains the adsorbent 51 that adsorbs NOx contained in the exhaust gas. Since the adsorbent 51 adsorbs NOx with high efficiency when the temperature of the exhaust gas is low, the NOx can be adsorbed on the adsorbent and removed when the temperature of the exhaust gas immediately after the start of the engine 10 is low. Here, since the exhaust gas from the engine 10 loses heat to the first processing unit 41 when flowing through the exhaust passage 20, the temperature between the first processing unit 41 and the second processing unit 42 is high. Differences may occur. Therefore, when the temperature of the first processing unit 41 rises and the NOx adsorbed on the adsorbent 51 begins to desorb, the selective reduction catalyst 52 of the second processing unit 42 may not be activated. .. In this case, the NOx desorbed from the adsorbent 51 cannot be removed by the selective reduction catalyst 52, and the amount of NOx discharged increases.

On the other hand, in the exhaust gas purification device 30, the temperature of the exhaust gas introduced into the first processing unit 41 is equal to or higher than the first temperature threshold, and the temperature of the exhaust gas introduced into the second processing unit is high. When the temperature of the exhaust gas to be measured is equal to or lower than the second temperature threshold, the carrier 53 of the second processing unit 42 is energized by the power adjusting unit 35, and the selective reduction catalyst 52 is heated. As a result, the selective reduction catalyst 52 is activated at an early stage, and NOx desorbed from the adsorbent 51 can be reduced on the selective reduction catalyst 52 by using the reducing agent from the reducing agent supply device 45.

Here, since the temperature of the exhaust gas introduced into the first processing unit 41 is equal to or higher than the first temperature threshold value, the temperature of the second processing unit is discharged when the heating of the second processing unit 42 is started. It is enhanced to some extent by the heat of the gas. Therefore, the power consumption for heating the second processing unit 42 to the activation temperature can be suppressed as compared with the case where the second processing unit 42 is heated from the time of cold start. Therefore, according to the exhaust gas purification device 30, NOx can be effectively removed while suppressing power consumption.

Hereinafter, the effect of the exhaust gas purification device 30 will be described more specifically based on a specific experimental example. In Experimental Example 1 and Comparative Experimental Example 1, exhaust gas was treated using the exhaust gas purification device 30, and the change over time in the temperature of the second treatment unit 42 from the start time of starting the engine 10 was measured. In Experimental Example 1, when the temperature of the exhaust gas introduced into the first processing unit 41 is 200 ° C. or higher and the temperature of the exhaust gas introduced into the second processing unit is 200 ° C. or lower, The carrier 53 of the second processing unit 42 was energized and heated. On the other hand, in Comparative Experimental Example 1, the second processing unit 42 was heated by the heat of the exhaust gas without energizing and heating the second processing unit 42.

FIG. 3 shows the temperature of the second processing unit 42 measured in Experimental Example 1 and Comparative Experimental Example 1. As shown in FIG. 3, in Comparative Experimental Example 1, the temperature of the second processing unit 42 increased later than the temperature increase of the exhaust gas introduced into the inlet of the first processing unit 41. Specifically, the temperature of the first processing unit 41 is the operating time t1 when the temperature reaches the desorption temperature of 200 ° C., and the temperature of the second processing unit 42 is lower than the activation temperature of 200 ° C. there were. Then, the temperature of the second processing unit 42 reached 200 ° C. in the operation time t2, which is later than the operation time t1. On the other hand, in Experimental Example 1, heating of the second processing unit 42 was started at the operating time t1 when the temperature of the first processing unit 41 reached 200 ° C., which is the desorption temperature, and as a result, Comparative Experimental Example 1 It was confirmed that the temperature of the second processing unit 42 could be raised to 200 ° C. earlier than that.

Next, Experimental Example 2 and Comparative Experimental Example 2 will be described. In Experimental Example 2, the exhaust gas was treated using the exhaust gas purification device 30, and the amount of NOx discharged from the second treatment unit 42 was measured. More specifically, in Experimental Example 2, the temperature of the exhaust gas introduced into the first processing unit 41 is 200 ° C. or higher, and the temperature of the exhaust gas introduced into the second processing unit is measured. When the temperature of the exhaust gas was 200 ° C. or lower, the carrier 53 of the second processing unit 42 was energized and heated. On the other hand, in Comparative Experimental Example 2, the exhaust gas was treated by using the selective reduction catalyst 52 of the second treatment unit 42 without the first treatment unit 41. Then, the amount of NOx discharged from the second processing unit 42 was measured. In Comparative Experimental Example 2, the second treatment unit 42 was not energized and heated, but the second treatment unit 42 was heated by the heat of the exhaust gas.

FIG. 4 shows the NOx emissions measured in Experimental Example 2 and Comparative Experimental Example 2. From the results shown in FIG. 4, it was confirmed that NOx emissions can be significantly reduced in Experimental Example 2 as compared with Comparative Experimental Example 2.

Next, Experimental Example 3 and Comparative Experimental Example 3 will be described. In Experimental Example 3, when the temperature of the exhaust gas introduced into the first processing unit 41 is 200 ° C. or higher and the temperature of the exhaust gas introduced into the second processing unit 42 is 200 ° C. or lower. The second processing unit 42 was energized and heated, and the power consumed until the temperature of the second processing unit 42 reached 200 ° C. was measured. On the other hand, in Comparative Experimental Example 3, the second processing unit 42 was energized and heated at the same time as the cold start of the engine 10, and the electric power consumed until the temperature of the second processing unit 42 reached 200 ° C. was measured.

FIG. 5 shows the power consumption measured in Experimental Example 3 and Comparative Experimental Example 3. As shown in FIG. 5, the power consumption measured in Experimental Example 3 was about half of the power consumption measured in Comparative Experimental Example 3. From this result, it was confirmed that the exhaust gas purification device 30 can significantly reduce the power consumption.

Although the exhaust gas purification device according to the various embodiments has been described above, various modifications can be configured without being limited to the above-described embodiment without changing the gist of the invention.

For example, in the above embodiment, the selective reduction catalyst 52 is heated by energizing and heating the carrier 53 by the electric power adjusting unit 35, but in one embodiment, the carrier 53 is arranged on or inside the carrier 53 made of corderite, for example. The second processing unit 42 may be heated by using the electric heater. The electric heater is composed of, for example, a nichrome, cantal or siliconite semiconductor, and generates heat by the electric power supplied from the electric power adjusting unit 35 to heat the carrier 53 of the second processing unit 42. In this case, the electric heater is used as a heating unit for heating the second processing unit 42.

In the above-described embodiment, the exhaust purification device 30 is mounted on a series hybrid vehicle, but the exhaust purification device 30 is mounted on a parallel hybrid vehicle that uses both an engine and a motor as power sources. It may be installed in a diesel vehicle that uses only an engine as a power source.

Further, in one embodiment, a filter device for collecting particulate matter (PM: Particulate Matter) contained in the exhaust gas may be provided on the upstream side of the first processing unit 41 in the exhaust passage 20. Further, the first processing unit 41 includes a filter coated with the adsorbent 51, and while adsorbing NOx contained in the exhaust gas by the adsorbent 51, the particulate matter contained in the exhaust gas is collected by the filter. You may.

10 ... engine (internal engine), 20 ... exhaust passage, 30 ... exhaust purification device, 35 ... power adjustment unit (heating unit), 41 ... first processing unit, 42 ... second processing unit, 43 ... temperature sensor ( 1st temperature sensor), 44 ... temperature sensor (second temperature sensor), 45 ... reducing agent supply device, 50 ... control device, 51 ... adsorbent, 52 ... selective reduction catalyst, 53 ... carrier.

Claims (8)

A first processing unit provided in an exhaust passage through which an exhaust gas discharged from an internal combustion engine flows, and the first processing unit containing an adsorbent that adsorbs nitrogen oxides (NOx) contained in the exhaust gas. When,
It is a second processing unit provided in the exhaust passage on the downstream side of the first processing unit, and includes a selective reduction catalyst that reduces NOx contained in the exhaust gas and a carrier that supports the selective reduction catalyst. , The second processing unit and
A first temperature sensor that measures the temperature of the exhaust gas introduced into the first processing unit, and
A second temperature sensor that measures the temperature of the exhaust gas introduced into the second processing unit, and
A reducing agent supply device that supplies a reducing agent to the second processing unit,
A heating unit that heats the second processing unit,
When the temperature of the exhaust gas measured by the first temperature sensor is equal to or higher than the first temperature threshold and the temperature of the exhaust gas measured by the second temperature sensor is equal to or lower than the second temperature threshold. A control device that controls the heating unit to heat the second processing unit at a certain time.
Equipped with an exhaust purification device. The exhaust gas purification device according to claim 1, wherein the heating unit includes a power adjusting unit that energizes the carrier to generate heat. The exhaust gas purification device according to claim 2, wherein the carrier is made of silicon carbide. The exhaust gas purification device according to claim 1, wherein the heating unit includes an electric heater for heating the carrier. The exhaust gas purification device according to claim 4, wherein the carrier is composed of cordierite. The exhaust purification device according to any one of claims 1 to 5, wherein the adsorbent contains a rare earth, an alkali metal, or an alkaline earth metal. The exhaust gas purification device according to claim 6, wherein the adsorbent further contains a noble metal. The exhaust gas purification device according to any one of claims 1 to 7, wherein the first processing unit includes a filter coated with the adsorbent.

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