Marine SCR catalyst and preparation method thereof

Abstract

The invention discloses a marine SCR (Selective Catalytic Reduction) catalyst and a preparation method thereof, the marine SCR catalyst comprises the following active components in percentage by mass: 5-20% of vanadium, 1-10% of tungsten, 1-15% of titanium and the like as well as 0.1-5% of auxiliaries and stabilizer, the active components mainly comprise vanadium, tungsten, titanium and the like, the auxiliaries comprise precious metals such as platinum, palladium, rhodium and the like and organic compounds, the content of the auxiliaries is 0.1-5%, the stabilizer is a polymer or an antioxidant, and the balance is water. The content of the active ingredients is 0.1%-3%, the carrier is aluminum oxide, kieselguhr or activated carbon, and the content of the carrier is the balance, and the preparation method comprises the steps of preparing an active ingredient solution, preparing the carrier, adding an auxiliary agent and a stabilizer, mixing and drying, forming, roasting and the like. The catalytic effect is favorably improved; the use ratio of the auxiliary agent to the stabilizer is moderate, so that the stability and durability of the catalyst are improved; the preparation process flow is clear and adjustable, is easy to control and optimize, and is beneficial to improving the production efficiency.

Description

Technical Field

[0001] The present invention relates to the field of catalyst preparation, and in particular to a marine SCR catalyst and a preparation method thereof. Background Art

[0002] Marine SCR catalyst is an important component used in ship exhaust treatment systems, and its function is to reduce the emission of nitrogen oxides (NOx). This catalyst converts NOx in exhaust gas into harmless nitrogen and water vapor through the process of Selective Catalytic Reduction (SCR), thereby reducing pollution to the environment. Its preparation method usually involves selecting suitable carrier materials (such as alumina, silica gel, etc.), adding active ingredients (such as vanadium, tungsten, molybdenum and other catalysts), and controlling the ratio and structure of the catalyst to ensure that the catalyst has efficient catalytic activity and stability. The specific preparation method may involve sol-gel method, co-precipitation method, impregnation method and other technologies, and requires strict sintering, activation and other process steps. Such catalysts play a vital role in the field of ships, helping ships to meet stricter emission standards and protect the marine environment.

[0003] However, the current method for preparing marine SCR catalysts still has some shortcomings: the preparation process needs to be carried out under laboratory conditions, which is relatively costly; the preparation process has high environmental requirements, which is not conducive to large-scale production; some steps require precise control, the operation is complex, and there are certain technical difficulties. Summary of the invention

[0004] The object of the present invention is to provide a marine SCR catalyst and a preparation method thereof to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a marine SCR catalyst and a preparation method thereof, comprising active ingredients, wherein the active ingredients are mainly vanadium, tungsten, titanium, etc., and appropriate amounts of additives and stabilizers. The content of the active ingredients is calculated as follows by mass percentage: vanadium 5% to 20%, tungsten 1% to 10%, titanium 1% to 15%, the additives include precious metals such as platinum, palladium, rhodium and organic compounds, and the content thereof is 0.1% to 5%, the stabilizer is a polymer or an antioxidant, and the content thereof is 0.1% to 3%, the carrier is alumina, diatomaceous earth or activated carbon, and the content thereof is the remainder, and the preparation method comprises the steps of preparing an active ingredient solution, preparing a carrier, adding additives and stabilizers, mixing and drying, molding and roasting.

[0006] Furthermore, the preparation of the active ingredient solution includes dissolving active ingredients such as vanadium and tungsten in a solvent. The formula of the active ingredient solution needs to be adjusted and optimized according to the working conditions and requirements of the ship diesel engine. The preparation of the active ingredient solution can be carried out by solvent extraction, chemical synthesis or other suitable methods. The content of the active ingredient can be adjusted according to the use environment and process requirements of the catalyst.

[0007] Furthermore, the step of preparing the carrier includes preparing alumina, diatomaceous earth or activated carbon into powder or granules, and the prepared marine SCR catalyst needs to be subjected to performance testing to verify its catalytic effect and stability.

[0008] Furthermore, the step of adding auxiliary agents and stabilizers includes gradually adding the auxiliary agents and stabilizers to the active ingredient solution. The selection of auxiliary agents and stabilizers needs to consider their compatibility and synergy with the active ingredient, and the amount of auxiliary agents and stabilizers added needs to be adjusted according to experimental data and process experience.

[0009] Furthermore, during the mixing and drying process, the drying temperature of the mixture is 50°C to 150°C, the drying time is 2 hours to 24 hours, the stirring speed of the mixture during the mixing and drying process is 100 rpm to 500 rpm, and the environment needs to be kept dry during the mixing and drying process to ensure the quality and stability of the catalyst.

[0010] Furthermore, the shape of the molding can be particles, blocks or other desired shapes. The molded catalyst needs to undergo a surface area test to ensure that its surface area meets the requirements. The molded catalyst can be screened or otherwise processed to achieve the desired particle size and shape. The molding of the catalyst can be carried out by pressing, spraying or impregnation. The shape and size of the catalyst need to be designed and adjusted according to the structure and space limitations of the ship diesel engine.

[0011] Furthermore, the calcination temperature is 300°C to 800°C, and the time is 1 hour to 5 hours. The atmosphere during the calcination process can be oxygen, nitrogen or other inert gases to ensure that the structure and performance of the catalyst are not affected by oxidation or reduction. The calcined catalyst needs to be cooled to reach a stable state after room temperature. The temperature and time during the calcination process need to be precisely controlled to ensure that the structure and activity of the catalyst are not damaged.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The device has a wide range of active ingredient content and can be adjusted according to different marine diesel engine operating conditions, which is beneficial to improving the catalytic effect; the auxiliary agent and stabilizer are used in a moderate proportion, which helps to improve the stability and durability of the catalyst; the preparation process is clear and adjustable, easy to control and optimize, and helps to improve production efficiency. DETAILED DESCRIPTION

[0013] The invention is further described below in conjunction with specific implementation methods: A marine SCR catalyst and a preparation method thereof according to an embodiment of the present invention include active ingredients, which are mainly vanadium, tungsten, titanium, etc., and appropriate amounts of additives and stabilizers. The content of the active ingredients is calculated as follows by mass percentage: vanadium 5% to 20%, tungsten 1% to 10%, titanium 1% to 15%, the additives include precious metals and organic compounds such as platinum, palladium, and rhodium, and the content thereof is 0.1% to 5%, the stabilizer is a polymer or an antioxidant, and the content thereof is 0.1% to 3%, and the carrier is alumina, diatomaceous earth or activated carbon, and the content thereof is the remainder. The preparation method includes the steps of preparing an active ingredient solution, preparing a carrier, adding additives and stabilizers, mixing and drying, molding, and roasting.

[0014] Among them, the basic characteristics of the composition and preparation method of the catalyst include the composition and content of the active ingredients (vanadium, tungsten, titanium, etc.), additives, stabilizers and carriers, as well as the steps of the preparation process (preparation of active ingredient solution, preparation of carrier, addition of additives and stabilizers, mixing and drying, molding and calcination).

[0015] In this embodiment, the preparation of the active ingredient solution includes dissolving active ingredients such as vanadium and tungsten in a solvent. The formula of the active ingredient solution needs to be adjusted and optimized according to the working conditions and requirements of the ship diesel engine. The active ingredient solution can be prepared by solvent extraction, chemical synthesis or other suitable methods. The content of the active ingredient can be adjusted according to the use environment and process requirements of the catalyst.

[0016] Among them, the formula of the active ingredient solution needs to be adjusted and optimized according to the working conditions and requirements of the ship diesel engine, and the content of the active ingredient can be adjusted according to the use environment and process requirements of the catalyst.

[0017] In this embodiment, the step of preparing the carrier includes preparing alumina, diatomaceous earth or activated carbon into powder or granules, and the prepared marine SCR catalyst needs to be subjected to performance testing to verify its catalytic effect and stability.

[0018] Therein, the steps of preparing the carrier are described, namely preparing alumina, diatomaceous earth or activated carbon into powder or granules, and it is mentioned that the catalyst needs to be performance tested to verify its catalytic effect and stability.

[0019] In this embodiment, the step of adding auxiliary agents and stabilizers includes gradually adding the auxiliary agents and stabilizers to the active ingredient solution. The selection of auxiliary agents and stabilizers needs to consider their compatibility and synergistic effect with the active ingredient, and the addition amount of the auxiliary agents and stabilizers needs to be adjusted according to experimental data and process experience.

[0020] Among them, the step of adding auxiliary agents and stabilizers needs to consider the compatibility and synergistic effect of the auxiliary agents and stabilizers with the active ingredients, and adjust the addition amount based on experimental data and process experience.

[0021] In this embodiment, during the mixing and drying process, the drying temperature of the mixture is 50°C to 150°C, the drying time is 2 hours to 24 hours, the stirring speed of the mixture during the mixing and drying process is 100 rpm to 500 rpm, and the environment needs to be kept dry during the mixing and drying process to ensure the quality and stability of the catalyst.

[0022] Among them, the conditions of the mixing and drying process, including drying temperature, time and stirring speed, are to ensure the quality and stability of the catalyst.

[0023] In this embodiment, the formed shape can be particles, blocks or other desired shapes. The formed catalyst needs to undergo a surface area test to ensure that its surface area meets the requirements. The formed catalyst can be screened or otherwise processed to achieve the desired particle size and shape. The catalyst can be formed by pressing, spraying or impregnation. The shape and size of the catalyst need to be designed and adjusted according to the structure and space limitations of the ship diesel engine.

[0024] Among them, the catalyst molding process includes shape selection, surface area testing, adjustment of particle size and shape, and selection of molding technology.

[0025] In this embodiment, the calcination temperature is 300°C~800°C, and the time is 1 hour~5 hours. The atmosphere during the calcination process can be oxygen, nitrogen or other inert gases to ensure that the structure and performance of the catalyst are not affected by oxidation or reduction. The calcined catalyst needs to be cooled to reach a stable state after room temperature. The temperature and time during the calcination process need to be precisely controlled to ensure that the structure and activity of the catalyst are not damaged.

[0026] Among them, the conditions of the calcination process, including the control of temperature, time and atmosphere, are mentioned to ensure that the structure and activity of the catalyst are not damaged, and it is mentioned that cooling treatment is required after calcination to achieve a stable state.

[0027] In specific applications, the active ingredient solution is prepared: active ingredients such as vanadium and tungsten are dissolved in a solvent, and the solvent is adjusted and optimized according to the working conditions and requirements of the ship diesel engine. The carrier is prepared: alumina, diatomaceous earth or activated carbon is prepared into powder or granules. Adding additives and stabilizers: additives such as precious metals and organic compounds and stabilizers such as polymers and antioxidants are gradually added to the active ingredient solution. Mixing and drying: under dry conditions, the active ingredient solution, carrier, additives and stabilizers are mixed and dried. Molding: as needed, the mixture is molded into granules, blocks or other required shapes, and subjected to surface area testing and particle size adjustment. Calcination: The molded catalyst is calcined under controlled temperature and atmosphere to ensure that its structure and activity are not damaged.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "top", "bottom", "one side", "the other side", "front", "back", "middle part", "inside", "top end", "bottom end", etc. is an orientation or positional relationship, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A marine SCR catalyst and a preparation method thereof, characterized in that: The invention comprises active ingredients, which are mainly vanadium, tungsten, titanium and the like, and appropriate amounts of auxiliary agents and stabilizers. The contents of the active ingredients are calculated as follows by mass percentage: vanadium 5% to 20%, tungsten 1% to 10%, and titanium 1% to 15%. The auxiliary agents include precious metals such as platinum, palladium, rhodium and organic compounds, and the contents thereof are 0.1% to 5%. The stabilizer is a polymer or an antioxidant, and the content thereof is 0.1% to 3%. The carrier is alumina, diatomaceous earth or activated carbon, and the content thereof is the remainder. The preparation method comprises the steps of preparing an active ingredient solution, preparing a carrier, adding auxiliary agents and stabilizers, mixing and drying, molding and roasting.

2. A marine SCR catalyst and a preparation method thereof according to claim 1, characterized in that: The preparation of the active ingredient solution includes dissolving active ingredients such as vanadium and tungsten in a solvent. The formula of the active ingredient solution needs to be adjusted and optimized according to the working conditions and requirements of the ship diesel engine. The preparation of the active ingredient solution can be carried out by solvent extraction, chemical synthesis or other suitable methods. The content of the active ingredient can be adjusted according to the use environment and process requirements of the catalyst.

3. A marine SCR catalyst and a preparation method thereof according to claim 1, characterized in that: The step of preparing the carrier includes preparing alumina, diatomaceous earth or activated carbon into powder or granules. The prepared marine SCR catalyst needs to be subjected to performance testing to verify its catalytic effect and stability.

4. A marine SCR catalyst and a preparation method thereof according to claim 1, characterized in that: The step of adding auxiliary agents and stabilizers includes gradually adding the auxiliary agents and stabilizers to the active ingredient solution. The selection of auxiliary agents and stabilizers needs to consider their compatibility and synergy with the active ingredient, and the addition amount of auxiliary agents and stabilizers needs to be adjusted according to experimental data and process experience.

5. A marine SCR catalyst and a preparation method thereof according to claim 1, characterized in that: During the mixing and drying process, the drying temperature of the mixture is 50°C to 150°C, the drying time is 2 hours to 24 hours, the stirring speed of the mixture during the mixing and drying process is 100 rpm to 500 rpm, and the environment needs to be kept dry during the mixing and drying process to ensure the quality and stability of the catalyst.

6. A marine SCR catalyst and a preparation method thereof according to claim 1, characterized in that: The shape of the molding can be particles, blocks or other required shapes. The molded catalyst needs to undergo a surface area test to ensure that its surface area meets the requirements. The molded catalyst can be screened or otherwise processed to achieve the required particle size and shape. The molding of the catalyst can be carried out by pressing, spraying or impregnation. The shape and size of the catalyst need to be designed and adjusted according to the structure and space limitations of the ship diesel engine.

7. A marine SCR catalyst and a preparation method thereof according to claim 1, characterized in that: The calcination temperature is 300°C to 800°C, and the time is 1 hour to 5 hours. The atmosphere during the calcination process can be oxygen, nitrogen or other inert gases to ensure that the structure and performance of the catalyst are not affected by oxidation or reduction. The calcined catalyst needs to be cooled to reach a stable state after room temperature. The temperature and time during the calcination process need to be precisely controlled to ensure that the structure and activity of the catalyst are not damaged.