Method for preparing micro-nano scale copper-manganese carbon monoxide removal catalyst by micro-reaction

Abstract

The application discloses a kind of micro-reaction preparation micro-nano scale copper manganese carbon monoxide removal catalyst method, belong to catalyst preparation technical field.Preparation method includes:1, copper nitrate, manganese nitrate, template agent, nonionic surfactant are dissolved in water, and mixed metal salt solution is obtained;Potassium carbonate is dissolved in deionized water to form precipitant solution;2, mixed metal salt solution and precipitant solution are pumped into mixer simultaneously, after mixing, into microchannel reactor and react to obtain suspension reaction liquid and constant temperature maintenance;3, after maintenance, the suspension is filtered, filter cake is washed, dried, calcined, and copper manganese composite oxide powder is obtained;Copper manganese composite oxide powder and graphite, pseudo-boehmite, attapulgite, high-alumina cement, sesbania grandiflora powder, CMC solution are mixed and uniformly stirred, after extruding, secondary calcination is carried out, and micro-nano scale copper manganese carbon monoxide removal catalyst is obtained.The micro-nano scale copper manganese carbon monoxide removal catalyst of the application has high mechanical strength, large specific surface area and long service life.

Description

Technical Field

[0001] This invention discloses a method for preparing micro-nano-scale copper-manganese decarbonization catalysts through micro-reactions, belonging to the field of catalyst preparation technology. Background Technology

[0002] Carbon monoxide is a highly toxic gas widely present in industrial production, vehicle exhaust, and mining operations, posing a threat to human health and the environment. Hogarat catalysts, as highly efficient CO oxidation catalysts, are commonly used in CO removal due to their low cost and excellent activity at room temperature. With increasing global environmental awareness and stricter regulations, the demand for waste gas treatment in the industrial sector is constantly growing. Hogarat catalysts, as highly efficient CO removal catalysts, have significant advantages in waste gas treatment and are commonly used in industries such as chemical engineering and printing for the efficient catalytic oxidation of hydrogen sulfide, volatile organic compounds (VOCs), and carbon monoxide; therefore, their market demand continues to grow.

[0003] Current technologies for producing Hogarat catalysts have several problems. The traditional co-precipitation method involves mixing a metal salt solution with a precipitant in a stirred tank, but this method has significant drawbacks: firstly, the mixing efficiency is low, making it difficult to achieve uniform molecular-level contact between metal ions and the precipitant, leading to severe product particle agglomeration and uneven particle size distribution, typically above 500 nm; secondly, the specific surface area is limited, generally below 120 μm. 2 The catalyst exhibits several drawbacks. First, its adaptability to extreme conditions is insufficient; in low-oxygen environments (O2 < 18%) in mines, the CO conversion rate drops sharply to below 60%. Second, reaction conditions are difficult to control precisely; excessively high local concentrations during precipitation can easily lead to abnormal crystal growth, affecting the exposure of catalytic active sites. Third, the catalyst's mechanical strength and stability are insufficient; catalysts prepared by traditional processes typically have a strength of only 20 N / cm². 2 In practical applications such as high pressure and vibration, it is prone to pulverization and has weak resistance to moisture and poisoning, with a service life of less than 1000 hours.

[0004] Existing technologies for producing hogallat catalysts still suffer from problems such as insufficient product strength and stability, low catalytic efficiency, and inability to precisely control microscopic dimensions. Summary of the Invention

[0005] To address the aforementioned problems in the existing technology, this invention provides a method for preparing micro-nano-scale copper-manganese decarbonization catalysts based on improvements and innovations to the traditional co-precipitation method, achieving the following objective: to prepare high-performance copper-manganese decarbonization catalysts with high strength and large specific surface area.

[0006] To achieve the above objectives, the following technical solution is adopted:

[0007] A method for preparing micro / nano-scale copper-manganese carbon monoxide removal catalysts via micro-reactions includes the following steps:

[0008] Step 1: Prepare the reaction solution

[0009] 1. Preparation of mixed metal salt solution: Dissolve copper nitrate, manganese nitrate, stencil agent, and nonionic surfactant in deionized water and stir until homogeneous to obtain mixed metal salt solution.

[0010] In the mixed metal salt solution, the molar ratio of Cu to Mn is 1:(2~3), and the total concentration of metal ions is 0.8~2.0 mol / L.

[0011] The nonionic surfactant is at least one of Tween 80 and polyethylene glycol (PEG-4000), and its dosage is 0.8% to 2% of the total mass of copper nitrate and manganese nitrate.

[0012] The template agent is at least one of hexadecyltrimethylammonium bromide and sodium dodecyl sulfate, and its dosage is 3% to 6% of the total mass of copper nitrate and manganese nitrate.

[0013] 2. Preparation of precipitant: Dissolve potassium carbonate in deionized water to form a precipitant solution with a concentration of 0.6~1.0 mol / L.

[0014] Step 2: Microreaction precipitation and crystallization

[0015] The mixed metal salt solution and the precipitant solution are simultaneously pumped into a mixer. After being mixed in the mixer, they enter a microchannel reactor, where a co-precipitation micro-reaction occurs to obtain a suspension containing crystal nuclei. The suspension is then introduced into a constant-temperature reactor and cured at a constant temperature for 18-24 hours to promote crystal growth.

[0016] The pumping rate of the mixed metal salt solution is 18-20 mL / min, and the pumping rate of the precipitant solution is 11-15 mL / min.

[0017] The temperature of the coprecipitation microreaction is controlled at 55~70℃.

[0018] The constant temperature curing is performed at a temperature of 55~70℃.

[0019] Step 3: Baking, Shaping, and Sheet Forming

[0020] The cured suspension was filtered, and the resulting filter cake was washed with deionized water until neutral, then dried and calcined for 3-5 hours to obtain micro-nano-scale copper-manganese composite oxide powder. The copper-manganese composite oxide powder and graphite were added to a high-speed mixer to form a mixed powder. Then, pseudoboehmite, attapulgite, high-alumina cement, guar gum powder, and CMC solution were added and stirred until homogeneous. The mixture was then transferred to an extruder for extrusion and subjected to a second calcination to obtain a micro-nano-scale copper-manganese carbon monoxide removal catalyst.

[0021] The mass ratio of the mixed powder: copper-manganese composite oxide powder to graphite is (95~98):(2~5).

[0022] The amount of the pseudoboehmite is 5-10% of the mass of the mixed powder.

[0023] The amount of attapulgite clay used is 4-7% of the mass of the mixed powder.

[0024] The amount of high-alumina cement used is 4-7% of the mass of the mixed powder.

[0025] The amount of guar gum powder used is 1-2% of the mass of the mixed powder.

[0026] The drying process involves drying at 100-120℃ for 5-8 hours.

[0027] The roasting temperature is 350~450℃.

[0028] The secondary roasting: the roasting temperature is 350~450℃, and the roasting time is 3~5h.

[0029] The CMC solution is a carboxymethyl cellulose solution with a mass concentration of 0.5-1.5% and a dosage of 13%-18% of the mass of the mixed powder.

[0030] The extrusion output is controlled by adjusting the extruder pressure to 15-20 MPa and the extruder speed to 10-15 r / min.

[0031] The core of this invention lies in the introduction of a microchannel reactor as a synthesis platform. Due to its extremely high specific surface area and extremely short mass and heat transfer distance, the microchannel reactor enables instantaneous and uniform mixing of reactants within microseconds, ensuring that copper and manganese ions achieve molecular-level contact during the initial nucleation stage, forming a highly homogeneous precursor. By controlling parameters such as flow rate and temperature, the monodispersity of the precursor particle size and morphology can be controlled, effectively suppressing Ostwald ripening. The uniform micro / nano precursor particles, combined with the use of a template agent, readily form a mesoporous structure after calcination, providing a large specific surface area to fully expose active sites and offering rapid channels for the diffusion of reactants and products.

[0032] The beneficial effects of this invention are as follows:

[0033] This invention provides a method for preparing micro / nano-scale copper-manganese carbon monoxide removal catalysts via micro-reactions. The copper-manganese carbon monoxide removal catalysts prepared by this method have a specific surface area of ​​284~306 m². 2 / g, with a mechanical strength reaching 31.7~35.3 N / cm. 2 The initial CO conversion rate is 99.5%~99.9%, and after 360 hours of accelerated aging treatment, the CO conversion rate can still be maintained at 93.4%~95.2%. The micro-nano scale copper-manganese decarbonization catalyst of the present invention has high mechanical strength, large specific surface area, high CO conversion efficiency, and long service life.

[0034] This invention employs a microchannel reactor instead of a traditional stirred reactor. Utilizing the strong shear effect and rapid mass transfer characteristics of the microchannel, a mixed metal salt solution of copper nitrate and manganese nitrate is uniformly mixed with a potassium carbonate precipitant solution within milliseconds. The high Reynolds number of the fluid within the microchannel creates turbulent mixing, avoiding particle agglomeration caused by excessively high local concentrations in traditional processes. This ensures simultaneous precipitation of metal ions, generating micro / nano-scale precipitates with uniform particle size. After curing, crystallization, and high-temperature calcination, the micro / nano-scale precipitates form a high specific surface area composite oxide structure. This structure exhibits excellent thermal stability and mechanical strength, maintaining the stability of the micro / nano-scale structure. This invention also utilizes a clover-shaped extruder outlet, resulting in a product with a larger contact area with the reactant gas compared to traditional columnar, blocky, or spherical products, further improving the utilization rate of active sites. Attached Figure Description

[0035] Figure 1 This is a product photo of the copper-manganese decarbonization catalyst of Example 1 of the present invention.

[0036] Figure 2 This is a SEM image of the copper-manganese decarbonization catalyst of Example 1 of the present invention. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0038] Example 1: A method for preparing micro / nano-scale copper-manganese carbon monoxide removal catalysts via micro-reactions

[0039] A method for preparing micro / nano-scale copper-manganese carbon monoxide removal catalysts via micro-reactions includes the following steps:

[0040] Step 1: Prepare the reaction solution

[0041] 1. Preparation of mixed metal salt solution:

[0042] Weigh 86.28g of copper nitrate, 204g of manganese nitrate, 17.42g of cetyltrimethylammonium bromide (6% of the total mass of copper nitrate and manganese nitrate), and 2.32g of PEG-4000 (0.8% of the total mass of copper nitrate and manganese nitrate). Dissolve them in deionized water and bring the volume to 2L to obtain a mixed metal salt solution with a total metal ion concentration of 0.8mol / L, wherein the molar ratio of Cu to Mn is 1:2.5.

[0043] 2. Preparation of precipitant:

[0044] Weigh 165.85g of potassium carbonate, dissolve it in deionized water, and make up to 2L to obtain a precipitant solution with a concentration of 0.6mol / L.

[0045] Step 2: Microreaction precipitation and crystallization

[0046] A mixed metal salt solution and a precipitant solution were simultaneously pumped into a mixer at a rate of 18 mL / min and 11 mL / min, respectively. After mixing, the mixture entered a microchannel reactor where a co-precipitation micro-reaction occurred, yielding a suspension containing crystal nuclei. The temperature of the co-precipitation micro-reaction was controlled at 70°C. The suspension was then introduced into a constant-temperature reactor and incubated at 70°C for 18 hours to promote crystal growth.

[0047] Step 3: Baking, Shaping, and Sheet Forming

[0048] The cured suspension was filtered, and the resulting filter cake was washed with deionized water until neutral. It was then dried at 120℃ for 8 hours, followed by calcination at 450℃ for 3 hours to obtain micro / nano-scale copper-manganese composite oxide powder. The copper-manganese composite oxide powder was mixed with graphite at a mass ratio of 95:5 in a high-speed mixer to obtain a mixed powder. Then, pseudoboehmite, attapulgite, high-alumina cement, and guar gum powder were added, and CMC solution was evenly sprayed into the high-speed mixer. After thorough mixing, the mixture was transferred to an extruder. The extruder pressure was controlled at 15 MPa and the speed at 10 r / min, and the material was extruded from a clover-shaped outlet. The mixture was then calcined a second time at 450℃ for 3 hours to obtain a micro / nano-scale copper-manganese decarbonization catalyst.

[0049] In this embodiment, the amount of pseudoboehmite used is 8% of the mass of the mixed powder.

[0050] In this embodiment, the amount of attapulgite clay used is 5% of the mass of the mixed powder.

[0051] In this embodiment, the amount of high-alumina cement used is 7% of the mass of the mixed powder.

[0052] In this embodiment, the amount of guar gum powder used is 1% of the mass of the mixed powder.

[0053] The CMC solution used in this embodiment has a mass concentration of 1% and is used in an amount that is 15% of the mass of the mixed powder.

[0054] Example 2: A method for preparing micro / nano-scale copper-manganese decarbonization catalysts via microreactions

[0055] A method for preparing micro / nano-scale copper-manganese carbon monoxide removal catalysts via micro-reactions includes the following steps:

[0056] Step 1: Prepare the reaction solution

[0057] 1. Preparation of mixed metal salt solution:

[0058] Weigh 150.05g of copper nitrate, 357.90g of manganese nitrate, 20.32g of hexadecyltrimethylammonium bromide (4% of the total mass of copper nitrate and manganese nitrate), and 5.08g of Tween 80 (1% of the total mass of copper nitrate and manganese nitrate). Dissolve them in deionized water and bring the volume to 2L to obtain a mixed metal salt solution with a total metal ion concentration of 1.4mol / L, wherein the molar ratio of Cu to Mn is 1:2.5.

[0059] 2. Preparation of precipitant:

[0060] Weigh 221.13g of potassium carbonate, dissolve it in deionized water, and make up to 2L to obtain a precipitant solution with a concentration of 0.8mol / L.

[0061] Step 2: Microreaction precipitation and crystallization

[0062] A mixed metal salt solution and a precipitant solution were simultaneously pumped into a mixer at a rate of 18 mL / min and 13.45 mL / min, respectively. After mixing, the mixture entered a microchannel reactor where a co-precipitation micro-reaction occurred, yielding a suspension containing crystal nuclei. The temperature of the co-precipitation micro-reaction was controlled at 60°C. The suspension was then transferred to a constant-temperature reactor and cured at 60°C for 20 hours to promote crystal growth.

[0063] Step 3: Baking, Shaping, and Sheet Forming

[0064] The cured suspension was filtered, and the resulting filter cake was washed with deionized water until neutral. It was then dried at 120℃ for 6 hours, followed by calcination at 400℃ for 5 hours to obtain micro / nano-scale copper-manganese composite oxide powder. The copper-manganese composite oxide powder was mixed with graphite at a mass ratio of 97:3 in a high-speed mixer to obtain a mixed powder. Then, pseudoboehmite, attapulgite, high-alumina cement, and guar gum powder were added, and CMC solution was evenly sprayed into the high-speed mixer. After thorough mixing, the mixture was transferred to an extruder. The extruder pressure was controlled at 20 MPa and the speed at 10 r / min, and the material was extruded from a clover-shaped outlet. The mixture was then calcined a second time at 400℃ for 5 hours to obtain a micro / nano-scale copper-manganese decarbonization catalyst.

[0065] In this embodiment, the amount of pseudoboehmite used is 5% of the mass of the mixed powder.

[0066] In this embodiment, the amount of attapulgite clay used is 7% of the mass of the mixed powder.

[0067] In this embodiment, the amount of high-alumina cement used is 4% of the mass of the mixed powder.

[0068] In this embodiment, the amount of guar gum powder used is 2% of the mass of the mixed powder.

[0069] The CMC solution used in this embodiment has a mass concentration of 0.5%, is used for secondary calcination, and its amount is 18% of the mass of the mixed powder.

[0070] Example 3: A method for preparing micro / nano-scale copper-manganese decarbonization catalysts via microreactions

[0071] A method for preparing micro / nano-scale copper-manganese carbon monoxide removal catalysts via micro-reactions includes the following steps:

[0072] Step 1: Prepare the reaction solution

[0073] 1. Preparation of mixed metal salt solution:

[0074] Weigh 150.05g of copper nitrate, 286.32g of manganese nitrate, 17.45g of sodium dodecyl sulfate (4% of the total mass of copper nitrate and manganese nitrate), and 6.55g of PEG-4000 (1.5% of the total mass of copper nitrate and manganese nitrate). Dissolve them in deionized water and bring the volume to 2L to obtain a mixed metal salt solution with a total metal ion concentration of 1.2mol / L, wherein the molar ratio of Cu to Mn is 1:2.

[0075] 2. Preparation of precipitant:

[0076] Weigh 221.13g of potassium carbonate, dissolve it in deionized water, and make up to 2L to obtain a precipitant solution with a concentration of 0.8mol / L.

[0077] Step 2: Microreaction precipitation and crystallization

[0078] A mixed metal salt solution and a precipitant solution were simultaneously pumped into a mixer at a rate of 18 mL / min and 12.5 mL / min, respectively. After mixing, the mixture entered a microchannel reactor where a co-precipitation micro-reaction occurred, yielding a suspension containing crystal nuclei. The temperature of the co-precipitation micro-reaction was controlled at 65°C. The suspension was then transferred to a constant-temperature reactor and incubated at 65°C for 24 hours to promote crystal growth.

[0079] Step 3: Baking, Shaping, and Sheet Forming

[0080] The cured suspension was filtered, and the resulting filter cake was washed with deionized water until neutral. It was then dried at 150℃ for 5 hours, followed by calcination at 350℃ for 5 hours to obtain micro / nano-scale copper-manganese composite oxide powder. The copper-manganese composite oxide powder was mixed with graphite at a mass ratio of 98:2 in a high-speed mixer to obtain a mixed powder. Then, pseudoboehmite, attapulgite, high-alumina cement, and guar gum powder were added, and CMC solution was evenly sprayed into the high-speed mixer. After thorough mixing, the mixture was transferred to an extruder. The extruder pressure was controlled at 20 MPa and the speed at 10 r / min, and the material was extruded from a clover-shaped outlet. The mixture was then calcined a second time at 350℃ for 5 hours to obtain a micro / nano-scale copper-manganese decarbonization catalyst.

[0081] In this embodiment, the amount of pseudoboehmite used is 10% of the mass of the mixed powder.

[0082] In this embodiment, the amount of attapulgite clay used is 4% of the mass of the mixed powder.

[0083] In this embodiment, the amount of high-alumina cement used is 4% of the mass of the mixed powder.

[0084] In this embodiment, the amount of guar gum powder used is 1% of the mass of the mixed powder.

[0085] The CMC solution used in this embodiment has a mass concentration of 1.5% and is used in an amount that is 13% of the mass of the mixed powder.

[0086] Example 4: A method for preparing micro / nano-scale copper-manganese carbon monoxide removal catalysts via microreactions

[0087] A method for preparing micro / nano-scale copper-manganese carbon monoxide removal catalysts via micro-reactions includes the following steps:

[0088] Step 1: Prepare the reaction solution

[0089] 1. Preparation of mixed metal salt solution:

[0090] Weigh 187.57g of copper nitrate, 536.84g of manganese nitrate, 21.73g of sodium dodecyl sulfate (3% of the total mass of copper nitrate and manganese nitrate), and 14.49g of Tween 80 (2% of the total mass of copper nitrate and manganese nitrate). Dissolve them in deionized water and bring the volume to 2L to obtain a mixed metal salt solution with a total metal ion concentration of 2.0mol / L, wherein the molar ratio of Cu to Mn is 1:3.

[0091] 2. Preparation of precipitant:

[0092] Weigh 276.41g of potassium carbonate, dissolve it in deionized water, and make up to 2L to obtain a precipitant solution with a concentration of 1.0mol / L.

[0093] Step 2: Microreaction precipitation and crystallization

[0094] A mixed metal salt solution and a precipitant solution were simultaneously pumped into a mixer at a rate of 20 mL / min and 15 mL / min, respectively. After mixing, the mixture entered a microchannel reactor where a co-precipitation micro-reaction occurred, yielding a suspension containing crystal nuclei. The temperature of the co-precipitation micro-reaction was controlled at 55 °C. The suspension was then transferred to a constant-temperature reactor and incubated at 55 °C for 24 hours to promote crystal growth.

[0095] Step 3: Baking, Shaping, and Sheet Forming

[0096] The cured suspension was filtered, and the resulting filter cake was washed with deionized water until neutral. It was then dried at 120℃ for 6 hours, followed by calcination at 400℃ for 4 hours to obtain micro / nano-scale copper-manganese composite oxide powder. The copper-manganese composite oxide powder was mixed with graphite at a mass ratio of 96:4 in a high-speed mixer to obtain a mixed powder. Then, pseudoboehmite, attapulgite, high-alumina cement, and guar gum powder were added, and CMC solution was evenly sprayed into the high-speed mixer. After thorough mixing, the mixture was transferred to an extruder. The extruder pressure was controlled at 20 MPa and the speed at 15 r / min, and the material was extruded from a clover-shaped outlet. The mixture was then calcined a second time at 400℃ for 4 hours to obtain a micro / nano-scale copper-manganese decarbonization catalyst.

[0097] In this embodiment, the amount of pseudoboehmite used is 8% of the mass of the mixed powder.

[0098] In this embodiment, the amount of attapulgite clay used is 5% of the mass of the mixed powder.

[0099] In this embodiment, the amount of high-alumina cement used is 5% of the mass of the mixed powder.

[0100] In this embodiment, the amount of guar gum powder used is 1% of the mass of the mixed powder.

[0101] The CMC solution used in this embodiment has a weight concentration of 0.5% and is used in an amount that is 15% of the mass of the mixed powder.

[0102] Performance testing

[0103] The performance of the micro-nano scale copper-manganese decarbonization catalysts prepared in Examples 1-4 was tested, and the test methods or standards are as follows; the test results are shown in Table 1.

[0104] Specific surface area test: After degassing the copper-manganese carbon monoxide removal catalyst sample at 300℃ for 3h, the test was performed according to the test method provided in GB / T19587-2017 "Determination of specific surface area of ​​solid substances by gas adsorption BET method".

[0105] Mechanical strength test: The test was conducted using a universal testing machine, according to the method provided in ASTM D4179-22, "Standard Test Method for Compressive Strength of Single Particles of Molded Catalysts and Catalyst Supports".

[0106] Initial CO conversion rate test: A fixed-bed reactor was used with a catalyst loading of 5g. The composition of the reaction gas was 0.5% CO (5000ppm), 15% O2, and the remainder was N2. The gas flow rate was 50mL / min, the reaction temperature was 25℃, and the relative humidity of the reaction gas was 30%. The CO concentration at the inlet and outlet was detected by gas chromatograph, and the CO conversion rate was calculated.

[0107] Service life test: The catalyst loading was 5g, and the catalyst underwent accelerated aging treatment. The accelerated aging conditions were: reaction gas 5% CO (50000ppm), 15% O2, with the remainder being N2; gas flow rate 50mL / min; reaction temperature 60℃; relative humidity of the reaction gas 30%; accelerated aging reaction for 360h (equivalent to 8600h). The catalyst was tested under the same conditions as the initial CO conversion rate test, and the CO conversion rate of the catalyst after 360h accelerated aging treatment was calculated.

[0108] Table 1. Performance test results of copper-manganese carbon monoxide removal catalysts in Examples 1-4

[0109]

[0110] As shown in Table 1, the specific surface area of ​​the micro / nano-scale copper-manganese carbon monoxide removal catalyst of the present invention is 284~306 m². 2 / g, with a mechanical strength reaching 31.7~35.3 N / cm. 2The initial CO conversion rate is 99.5%~99.9%; after 360h accelerated aging treatment, the CO conversion rate can still be maintained at 93.4%~95.2%. The micro-nano scale copper-manganese decarbonization catalyst of the present invention has high mechanical strength, large specific surface area, high CO conversion efficiency and long service life.

[0111] Obviously, there are many other possible implementation methods under the concept of this invention. It should be stated here that any changes made under the inventive concept of this invention will fall within the protection scope of this invention.

Claims

1. A method for preparing a micro-nanoscale copper-manganese carbon monoxide removal catalyst by micro-reaction, characterized in that: The method comprises the steps of preparing a reaction solution, micro-reaction precipitation crystallization, calcination molding and tabletting. The reaction solution is prepared by dissolving copper nitrate, manganese nitrate, a template agent and a non-ionic surfactant in water to obtain a mixed metal salt solution, and dissolving potassium carbonate in deionized water to form a precipitant solution; the total concentration of metal ions in the mixed metal salt solution is 0.8-2.0 mol / L, the molar ratio of Cu to Mn is 1:(2-3); the concentration of the precipitant solution is 0.6-1.0 mol / L; the template agent is at least one of cetyltrimethylammonium bromide and sodium dodecyl sulfate; and the non-ionic surfactant is at least one of Tween 80 and polyethylene glycol. The micro-reaction precipitation crystallization is performed by simultaneously pumping the mixed metal salt solution and the precipitant solution into a mixer, mixing them in the mixer, and then performing co-precipitation micro-reaction in a micro-channel reactor to obtain a suspension reaction liquid containing crystal nuclei, and then introducing the suspension reaction liquid into a constant-temperature reactor for constant-temperature curing for 18-24 hours. The pumping is performed at a pumping speed of 18-20 mL / min for the mixed metal salt solution and at a pumping speed of 11-15 mL / min for the precipitant solution. The temperature of the co-precipitation micro-reaction is controlled at 55-70 DEG C; and the constant-temperature curing is performed at a curing temperature of 55-70 DEG C. The calcination molding and tabletting are performed by filtering the suspension after curing, washing the filter cake, drying and calcining the filter cake to obtain micro-nano scale copper-manganese composite oxide powder, mixing the copper-manganese composite oxide powder with graphite to form a mixed powder, adding pseudo-boehmite, attapulgite, high-alumina cement, sesbania powder and CMC solution, uniformly stirring the mixture, and then feeding the mixture into an extruder to extrude the mixture, and then performing secondary calcination to obtain a micro-nano scale copper-manganese CO removal catalyst. The amount of the attapulgite is 4-7% of the mass of the mixed powder. The amount of the high-alumina cement is 4-7% of the mass of the mixed powder. The amount of the sesbania powder is 1-2% of the mass of the mixed powder.

2. The method according to claim 1, wherein the micro-reaction is used to prepare the micro-nano scale copper-manganese catalyst for removing carbon monoxide. The amount of the template agent is 3-6% of the total mass of copper nitrate and manganese nitrate; and the amount of the non-ionic surfactant is 0.8-2% of the total mass of copper nitrate and manganese nitrate.

3. The method of claim 1, wherein the micro-reaction is carried out in a micro-reactor. The drying is performed at 100-120 DEG C for 5-8 hours.

4. The method of claim 1, wherein the micro-reaction is carried out in a micro- reactor. The calcination is performed at a calcination temperature of 350-450 DEG C for 3-5 hours; and the secondary calcination is performed at a calcination temperature of 350-450 DEG C for 3-5 hours.

5. The method of claim 1, wherein the micro-reaction is carried out in a micro-reactor. The mixed powder: the mass ratio of the copper-manganese composite oxide powder to graphite in the mixed powder is (95-98):(2-5); The amount of the pseudo-boehmite is 5-10% of the mass of the mixed powder.

6. The method of claim 1, wherein the micro-reaction is performed in a micro-reactor. The CMC solution is a carboxymethyl cellulose solution; the mass concentration of the CMC solution is 0.5-1.5%; and the amount of the CMC solution is 13-18% of the mass of the mixed powder.

7. The method of claim 1, wherein the micro-reaction is carried out in a micro-reactor. The extrusion is performed by controlling the pressure of the extruder at 15-20 MPa and the rotation speed of the extruder at 10-15 r / min.

8. The method of claim 1, wherein the micro-reaction is used to prepare a micro- or nano-sized copper-manganese catalyst for the removal of carbon monoxide. The extruder: the discharge port of the extruder is in the shape of a clover.

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