Oxidation catalyst based on basalt aerogel carrier
By using basalt aerogel as the carrier of the oxidation catalyst, the problem that the oxidation catalyst in the prior art cannot be effectively insulated, and a higher exhaust temperature is achieved, providing more efficient conditions for the post-treatment link. And promotes efficient regeneration of DPF.
Patent Information
- Application Number
- CN202421338370.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-06-13
AI Technical Summary
The existing oxidation catalysts cannot be effectively insulated during use, resulting in heat loss in the exhaust gas and cannot provide a higher temperature for subsequent post-treatment links, reducing the overall efficiency of post-treatment, and not conducive to efficient regeneration of DPF.
An oxidation catalyst based on a basalt aerogel carrier is used to fix the basalt aerogel on the inner side wall of the shell and coat the catalyst in its surface and internal voids, and its low thermal conductivity is used for insulation and heat insulation.
It reduces heat loss of exhaust gas during the oxidation catalyst treatment process, provides higher temperatures for subsequent post-treatment links, improves the overall efficiency of post-treatment, and facilitates efficient regeneration of DPF.
Smart Images
Figure CN222457553U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of engine post-processing, and in particular relates to an oxidation catalyst based on a basalt aerogel carrier. Background Art
[0002] In response to increasingly stringent emission regulations, exhaust aftertreatment systems consisting of oxidation catalytic converters (OC), catalytic particulate filters (DPFs) and selective catalytic reduction devices (SCRs) have become standard configurations for diesel engines and other engines. OC is mainly used to reduce gaseous pollutants such as CO and HC in engine exhaust, and oxidize NO to generate highly oxidizing NO2. DPF can achieve efficient capture of particulate matter in exhaust gas due to its unique wall-flow structure, but as the capture process continues, the accumulated soot will gradually increase, causing the exhaust back pressure to continue to increase, which requires the oxidation regeneration of the captured soot. The combustion of PM requires a relatively high temperature, generally above 650°C. The temperature of DPF can be increased by adding external equipment, such as fuel injection, electric heating, microwave heating and other regeneration methods, which are called active regeneration; the ignition temperature of PM can also be reduced by adding catalysts to the fuel or coating catalysts on the DPF wall, which is called passive regeneration. Passive regeneration can reduce the regeneration temperature of DPF to below 400°C. Regardless of the regeneration method adopted, maintaining a certain temperature in the DPF is conducive to the efficient regeneration reaction. Therefore, it is particularly important to keep the exhaust gas in the OC warm for efficient DPF regeneration.
[0003] Existing OCs usually use cordierite materials as carriers for carrying catalysts. Cordierite ceramics have a honeycomb structure and are characterized by good heat resistance, high melting point, high hardness, corrosion resistance, oxidation resistance, high temperature strength, and high elastic modulus. As an OC carrier, it has good thermal shock resistance and heat resistance, good adhesion to coatings and catalysts, and low cost. The thermal conductivity coefficient of cordierite ceramics is about 0.931~1.394W / (m2·K), while the thermal conductivity coefficient of basalt aerogel materials at room temperature is about 0.021W / (m2·K), which is much lower than cordierite ceramics. It has better thermal insulation performance and can provide a higher exhaust temperature for the DPF downstream of the OC.
[0004] When in use, the existing oxidation catalyst cannot effectively insulate the exhaust gas in the oxidation catalyst, which makes the heat in the exhaust gas easy to be lost and cannot provide a higher temperature for the exhaust gas in the subsequent post-processing link, thereby reducing the overall efficiency of promoting the post-processing and being unfavorable for the efficient regeneration of the DPF.
[0005] Therefore, there is a need for an oxidation catalyst based on a basalt aerogel carrier to solve the problem in the prior art that heat in the exhaust gas is easily lost, which cannot provide a higher temperature for the exhaust gas in the subsequent post-processing link, reduces the overall efficiency of promoting post-processing, and is not conducive to the efficient regeneration of DPF. Utility Model Content
[0006] The purpose of the utility model is to provide an oxidation catalyst based on a basalt aerogel carrier to solve the problems raised in the above background technology.
[0007] To achieve the above object, the utility model provides the following technical solution: an oxidation catalyst based on a basalt aerogel carrier, comprising a shell, the inner wall of the shell is fixed with basalt aerogel, and the surface and internal gaps of the basalt aerogel are coated with a catalyst.
[0008] Preferably, the shell is made of cordierite ceramic material.
[0009] Preferably, the geometric structure of the basalt aerogel is honeycomb or corrugated.
[0010] Preferably, the catalyst coating method adopts one of the precipitation method, the impregnation method and the sol-gel method.
[0011] Compared with the prior art, the oxidation catalyst based on the basalt aerogel carrier provided by the utility model has at least the following beneficial effects:
[0012] By using basalt aerogel with low thermal conductivity as the catalyst carrier of the oxidation catalyst, the heat loss of exhaust gas during the treatment process of the oxidation catalyst can be greatly reduced, thereby providing a higher temperature for the exhaust gas in the subsequent post-treatment link, promoting the overall efficiency of the post-treatment and facilitating the efficient regeneration of the DPF. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a schematic diagram of the front view structure of the honeycomb basalt aerogel of the utility model;
[0014] Figure 2 This is a schematic diagram of the side view structure of the honeycomb basalt aerogel of the utility model;
[0015] Figure 3 This is a schematic diagram of the front view structure of the corrugated basalt aerogel of the utility model;
[0016] Figure 4 The utility model is a schematic diagram of the side view structure of the corrugated basalt aerogel.
[0017] In the figure:
[0018] 100. Shell;
[0019] 200. Basalt aerogel. DETAILED DESCRIPTION
[0020] See also Figure 1-4 The utility model provides an oxidation catalyst based on a basalt aerogel carrier, comprising a shell 100, a basalt aerogel 200 is fixed to the inner wall of the shell 100, and a catalyst is coated on the surface and internal gaps of the basalt aerogel 200.
[0021] Furthermore, the shell 100 is made of cordierite ceramic material.
[0022] By setting the cordierite ceramic, the cordierite ceramic has a honeycomb structure, has good heat resistance, high melting point, high hardness, corrosion resistance and oxidation resistance, good high temperature strength, and high elastic modulus, which makes the mechanical strength of the oxidation catalyst higher and the service life longer.
[0023] This scheme has the following working process: the catalyst carrier is made based on basalt aerogel 200, which plays the role of carrying the catalyst in the oxidation catalyst, providing a place for the oxidation reaction of emission pollution such as CO and HC, and using a honeycomb or corrugated shape to support the geometric structure of the oxidation catalyst and heat insulation. The catalyst of the oxidation catalyst can be coated on the surface and internal gaps of the basalt aerogel 200 carrier by precipitation, impregnation, sol-gel method and other methods. When the engine exhaust flows in the oxidation catalyst, CO and HC in the exhaust gas undergo oxidation reaction under the action of the catalyst. Cordierite ceramics are used as the shell 100 of the oxidation catalyst to maintain the mechanical strength of the oxidation catalyst. By using basalt aerogel 200 as the main structure of the oxidation catalyst, the exhaust temperature is insulated, and a higher temperature exhaust is provided for the subsequent post-processing link, which is conducive to the regeneration of DPF and the improvement of the overall efficiency of post-processing.
[0024] According to the above working process, it can be known that by using basalt aerogel 200 with a low thermal conductivity coefficient as a catalyst carrier of the oxidation catalyst, the heat loss of the exhaust gas during the treatment process of the oxidation catalyst can be greatly reduced, thereby providing a higher temperature for the exhaust gas in the subsequent post-treatment link, promoting the overall efficiency of the post-treatment, and facilitating the efficient regeneration of the DPF.
[0025] Furthermore, the geometric structure of the basalt aerogel 200 is honeycomb or corrugated.
[0026] By using basalt aerogel 200 as the main structure of the oxidation catalyst, the exhaust temperature is kept warm, providing higher temperature exhaust for subsequent post-processing links, which is beneficial to the regeneration of DPF and the improvement of the overall efficiency of post-processing.
[0027] Furthermore, the catalyst coating method adopts one of the precipitation method, the impregnation method and the sol-gel method.
[0028] The coated catalyst can catalytically oxidize pollutants such as CO and HC in the exhaust gas.
[0029] In summary: the catalyst carrier made of basalt aerogel 200 plays the role of carrying the catalyst in the oxidation catalyst, providing a place for the oxidation reaction of emission pollution such as CO and HC, using a honeycomb or corrugated shape to support the geometric structure of the oxidation catalyst, and heat insulation. The catalyst of the oxidation catalyst can be coated on the surface and internal gaps of the basalt aerogel 200 carrier by precipitation, impregnation, sol-gel method and other methods. When the engine exhaust flows in the oxidation catalyst, substances such as CO and HC in the exhaust undergo oxidation reaction under the action of the catalyst. Cordierite ceramics are used as the shell 100 of the oxidation catalyst to maintain the mechanical strength of the oxidation catalyst. By using basalt aerogel 200 as the main structure of the oxidation catalyst, the exhaust temperature is insulated, and a higher temperature exhaust is provided for the subsequent post-processing link, which is conducive to the regeneration of DPF and the improvement of the overall efficiency of post-processing.
[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An oxidation catalyst based on a basalt aerogel carrier, comprising a housing (100), characterized in that: A basalt aerogel (200) is fixed to the inner wall of the shell (100), and a catalyst is coated on the surface and internal gaps of the basalt aerogel (200).
2. The oxidation catalyst based on basalt aerogel carrier according to claim 1, characterized in that: The shell (100) is made of cordierite ceramic material.
3. The oxidation catalyst based on basalt aerogel carrier according to claim 2, characterized in that: The geometric structure of the basalt aerogel (200) is honeycomb or corrugated.
4. The oxidation catalyst based on basalt aerogel carrier according to claim 3, characterized in that: The catalyst coating method adopts one of a precipitation method, an impregnation method and a sol-gel method.