Preparation device of bimetallic catalyst for CO and NH3 coupling denitration
Through the preparation device, the activated carbon support is impregnated into metal in sequence and microwave reaction is carried out to prepare a bimetallic catalyst, which solves the problem of coupled denitrification of low-temperature CO and NH3, and improves the performance and efficiency of the catalyst.
Patent Information
- Application Number
- CN202422491876.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-10-15
AI Technical Summary
The lack of a bimetallic catalyst preparation device in existing devices makes it difficult to achieve low-temperature CO and NH3 coupled denitrification technology, and there are problems such as high denitrification temperature window and easy oxidation of reducing agents.
The activated carbon support is soaked in the first and second metals in sequence by ultrasonic water bath oscillation, vacuum drying, ultrasonic impregnation, and calcination. Combined with reflux activation and microwave reaction, a bimetallic catalyst is prepared to increase porosity and improve anti-Na and K toxicity properties.
It realizes the rapid and efficient preparation of bimetallic catalysts, adapts to low-temperature CO and NH3 coupled denitrification, improves the specific surface area and anti-toxicity performance of the catalyst, and solves the denitrification temperature window and reducing agent oxidation problems.
Smart Images
Figure CN223263842U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a preparation device of a bimetallic catalyst for coupled denitration of CO and NH3, belonging to the technical field of flue gas purification. Background Art
[0002] Nitrogen oxides (NO x ) is the main air pollutant emitted during fuel combustion. Selective catalytic reduction technology using NH3 as a reducing agent is an important way to control NO x While NH3 is an effective means of reducing pollution, it is inherently expensive and prone to leakage, making it prone to chemical accidents. Denitrification technology using CO as a reducing agent can utilize CO in flue gas as a reducing agent to remove NO, simultaneously converting CO and NO into non-toxic N2 and CO2, achieving the goal of treating waste with waste. However, this technology also faces some difficult-to-break bottlenecks, such as a high denitrification temperature window and the reductant's susceptibility to oxidation. Therefore, combining the two gases for low- and medium-temperature flue gas NO removal can both reduce ammonia slip in NH3-SCR technology and address the narrow temperature range of CO-SCR technology.
[0003] However, the catalyst for low-temperature CO and NH3 coupled denitrification is generally a bimetallic catalyst formed by combining two or more active metals, but there is no preparation device for the bimetallic catalyst in existing devices. Utility Model Content
[0004] The utility model provides a preparation device for a bimetallic catalyst for low-temperature CO and NH3 coupled denitration. The device can be used to sequentially impregnate a carbon carrier with a first metal and a second metal, thereby realizing rapid and efficient preparation of the bimetallic catalyst suitable for low-temperature CO and NH3 coupled denitration.
[0005] A preparation device for a bimetallic catalyst for low-temperature CO and NH3 coupled denitration, comprising an ultrasonic water bath oscillator I1, a solid-liquid separation device I2, a vacuum drying device I3, an ultrasonic impregnation device I4, a solid-liquid separation device II5, a vacuum drying device II6, a roasting device I7, an ultrasonic impregnation device II9, a solid-liquid separation device III10, a vacuum drying device III11 and a roasting device II12, which are connected in sequence. The roasting device I7 is externally connected to a nitrogen supply device I8, and the roasting device II12 is externally connected to a nitrogen supply device II13. The ultrasonic impregnation device I4 is filled with a first metal impregnation liquid, and the ultrasonic impregnation device II9 is filled with a second metal impregnation liquid.
[0006] A carrier (such as activated carbon) is added to an ultrasonic water bath oscillator Ⅰ1 for ultrasonic washing, and then transported to a solid-liquid separation device Ⅰ2 for solid-liquid separation. The carrier after ultrasonic washing is transported to a vacuum drying device Ⅰ3 for vacuum drying. The vacuum-dried carrier is transported to an ultrasonic impregnation device Ⅰ4 for ultrasonic impregnation with a first metal, and then transported to a solid-liquid separation device Ⅱ5 for solid-liquid separation. The carrier impregnated with the first metal is transported to a vacuum drying device Ⅱ6 for vacuum drying, and then transported to a calcination device Ⅰ7 and calcined in a nitrogen atmosphere supplied by a nitrogen supply device Ⅰ8 to obtain a monometallic catalyst. The monometallic catalyst is transported to an ultrasonic impregnation device Ⅱ9 for ultrasonic impregnation with a second metal, and then transported to a solid-liquid separation device Ⅲ10 for solid-liquid separation. The carrier impregnated with the second metal is transported to a vacuum drying device Ⅲ11 for vacuum drying, and then transported to a calcination device Ⅱ12 and calcined in a nitrogen atmosphere supplied by a nitrogen supply device Ⅱ13 to obtain a bimetallic catalyst.
[0007] Preferably, a reflux activation device 14, a solid-liquid separation device IV15 and a vacuum drying device IV16 which are connected in sequence are further provided between the vacuum drying device I3 and the ultrasonic impregnation device I4. The reflux activation device 14 is connected to the vacuum drying device I3, and the vacuum drying device IV16 is connected to the ultrasonic impregnation device I4. The reflux activation device 14 is filled with reflux activation acid solution.
[0008] The carrier after vacuum drying in the vacuum drying device I3 is transported to the reflux activation device 14, and reflux activated in a reflux activation acid solution (such as nitric acid solution) to increase the porosity of the carrier, which is convenient for the subsequent metal impregnation.
[0009] More preferably, the preparation device for the low-temperature CO and NH3 coupled denitrification bimetallic catalyst further includes a microwave reaction device 17, a solid-liquid separation device V18 and a roasting device III19 connected in sequence, and the microwave reaction device 17 is filled with a hydrogen peroxide solution.
[0010] The bimetallic catalyst obtained by calcining in a nitrogen atmosphere is transported to a microwave reaction device 17, subjected to microwave micro-oxidation reaction in a hydrogen peroxide solution, and then transported to a calcination device III 19 for calcination after solid-liquid separation in a solid-liquid separation device V 18 to improve the bimetallic catalyst's resistance to Na and / or K poisoning.
[0011] The beneficial effects of the utility model are:
[0012] (1) The device of the utility model can sequentially impregnate a carbon support with a first metal and a second metal to achieve rapid and efficient preparation of a bimetallic catalyst suitable for low-temperature CO and NH3 coupled denitrification;
[0013] (2) The utility model can significantly improve the surface functional groups of coconut shell activated carbon, increase the specific surface area, and improve the internal pore volume and pore diameter of the activated carbon by setting a reflux activation device;
[0014] (3) The utility model sets a microwave reaction device, subjects the bimetallic catalyst to a microwave micro-oxidation reaction in a hydrogen peroxide solution, and then calcines it in a calcination device to achieve micro-oxidation on the surface of the bimetallic catalyst, thereby improving the bimetallic catalyst's resistance to Na and / or K poisoning. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the structure of the preparation device for the bimetallic catalyst for low-temperature CO and NH3 coupled denitration in Example 1;
[0016] Figure 2 This is a schematic diagram of the structure of the preparation device for the low-temperature CO and NH3 coupled denitration bimetallic catalyst of Example 2;
[0017] Figure 3 This is a schematic diagram of the structure of the preparation device for the bimetallic catalyst for low-temperature CO and NH3 coupled denitration in Example 3;
[0018] In the figure, 1-ultrasonic water bath oscillator I, 2-solid-liquid separation device I, 3-vacuum drying device I, 4-ultrasonic impregnation device I, 5-solid-liquid separation device II, 6-vacuum drying device II, 7-roasting device I, 8-nitrogen supply device I, 9-ultrasonic impregnation device II, 10-solid-liquid separation device III, 11-vacuum drying device III, 12-roasting device II, 13-nitrogen supply device II, 14-reflux activation device, 15-solid-liquid separation device IV, 16-vacuum drying device IV, 17-microwave reaction device, 18-solid-liquid separation device V, 19-roasting device III. DETAILED DESCRIPTION
[0019] The present invention will be further described in detail below in conjunction with specific implementation methods, but the protection scope of the present invention is not limited to the described contents.
[0020] Example 1: A preparation device for a bimetallic catalyst for low-temperature CO and NH3 coupled denitration (see Figure 1 ), comprising an ultrasonic water bath oscillator Ⅰ1, a solid-liquid separation device Ⅰ2, a vacuum drying device Ⅰ3, an ultrasonic impregnation device Ⅰ4, a solid-liquid separation device Ⅱ5, a vacuum drying device Ⅱ6, a roasting device Ⅰ7, an ultrasonic impregnation device Ⅱ9, a solid-liquid separation device Ⅲ10, a vacuum drying device Ⅲ11 and a roasting device Ⅱ12 connected in sequence, the roasting device Ⅰ7 is externally connected to a nitrogen supply device Ⅰ8, and the roasting device Ⅱ12 is externally connected to a nitrogen supply device Ⅱ13, the ultrasonic impregnation device Ⅰ4 is filled with a first metal impregnation liquid, and the ultrasonic impregnation device Ⅱ9 is filled with a second metal impregnation liquid;
[0021] The carrier (such as coconut shell activated carbon) is added to the ultrasonic water bath oscillator Ⅰ1 for ultrasonic washing, and then transported to the solid-liquid separation device Ⅰ2 for solid-liquid separation. The carrier after ultrasonic washing is transported to the vacuum drying device Ⅰ3 for vacuum drying. The vacuum dried carrier is transported to the ultrasonic impregnation device Ⅰ4 for ultrasonic impregnation of the first metal (such as Fe(NO3)3 solution for ultrasonic impregnation of the first metal Fe), and then transported to the solid-liquid separation device Ⅱ5 for solid-liquid separation. The carrier impregnated with the first metal is transported to the vacuum drying device Ⅱ6 for vacuum drying, and then transported to the roasting device Ⅰ7, and the nitrogen supplied by the nitrogen supply device Ⅰ8 is used. The monometallic catalyst is calcined in an ultrasonic impregnation device II9 for ultrasonic impregnation with a second metal (for example, ultrasonic impregnation of the second metal Mn in a Mn(NO3)2 solution), and then transported to a solid-liquid separation device III10 for solid-liquid separation. The carrier impregnated with the second metal is transported to a vacuum drying device III11 for vacuum drying, and then transported to a calcination device II12 and calcined in a nitrogen atmosphere supplied by a nitrogen supply device II13 (for example, calcined at a temperature of 450-500°C for 4-5h) to obtain a bimetallic catalyst.
[0022] Example 2: Figure 2 As shown, the structure of the preparation device of the bimetallic catalyst for low-temperature CO and NH3 coupled denitration of this embodiment is basically the same as that of the preparation device of the bimetallic catalyst for low-temperature CO and NH3 coupled denitration of Example 1, except that: a reflux activation device 14, a solid-liquid separation device IV 15 and a vacuum drying device IV 16 connected in sequence are further provided between the vacuum drying device I3 and the ultrasonic impregnation device I4, the reflux activation device 14 is connected to the vacuum drying device I3, and the vacuum drying device IV 16 is connected to the ultrasonic impregnation device I4; the reflux activation device 14 is filled with reflux activation acid;
[0023] The carrier after vacuum drying in the vacuum drying device I3 is transported to the reflux activation device 14 and reflux activated in a reflux activation acid solution (such as nitric acid solution) (for example, reflux activation treatment at a temperature of 80 to 90°C for 2 to 3 hours) to increase the porosity of the carrier and facilitate the subsequent metal impregnation.
[0024] Example 3: Figure 3 As shown, the preparation device of the bimetallic catalyst for low-temperature CO and NH3 coupled denitration in this embodiment has basically the same structure as the preparation device of the bimetallic catalyst for low-temperature CO and NH3 coupled denitration in Example 1, except that: the preparation device of the bimetallic catalyst for low-temperature CO and NH3 coupled denitration further includes a microwave reaction device 17, a solid-liquid separation device V18 and a roasting device III19 connected in sequence, and the microwave reaction device 17 is filled with a hydrogen peroxide solution.
[0025] The bimetallic catalyst obtained by calcining in a nitrogen atmosphere is transported to a microwave reaction device 17, subjected to a microwave micro-oxidation reaction in a hydrogen peroxide solution (for example, a microwave reaction at a temperature of 60-100°C for 1.0-2.0 hours), and then transported to a calcination device III 19 for calcination (for example, a calcination at a temperature of 200-500°C for 2-6 hours) after solid-liquid separation in a solid-liquid separation device V18 to improve the bimetallic catalyst's resistance to Na and / or K poisoning.
[0026] The above describes the specific implementation methods of the present invention in detail, but the present invention is not limited to the above implementation methods. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention.
Claims
1. A device for preparing a bimetallic catalyst for coupled denitration of CO and NH3, characterized by: The invention comprises an ultrasonic water bath oscillator I (1), a solid-liquid separation device I (2), a vacuum drying device I (3), an ultrasonic impregnation device I (4), a solid-liquid separation device II (5), a vacuum drying device II (6), a roasting device I (7), an ultrasonic impregnation device II (9), a solid-liquid separation device III (10), a vacuum drying device III (11) and a roasting device II (12) which are connected in sequence, wherein the roasting device I (7) is externally connected to a nitrogen supply device I (8), and the roasting device II (12) is externally connected to a nitrogen supply device II (13), the ultrasonic impregnation device I (4) is filled with a first metal impregnation liquid, and the ultrasonic impregnation device II (9) is filled with a second metal impregnation liquid.
2. The device for preparing a bimetallic catalyst for coupled denitration of CO and NH3 according to claim 1, characterized in that: A reflux activation device (14), a solid-liquid separation device IV (15) and a vacuum drying device IV (16) are provided between the vacuum drying device I (3) and the ultrasonic impregnation device I (4), and the reflux activation device (14) is connected to the vacuum drying device I (3), and the vacuum drying device IV (16) is connected to the ultrasonic impregnation device I (4); the reflux activation device (14) is filled with reflux activation acid solution.
3. The device for preparing a bimetallic catalyst for coupled denitration of CO and NH3 according to claim 2, characterized in that: It also includes a microwave reaction device (17), a solid-liquid separation device V (18) and a roasting device III (19) which are connected in sequence, and the microwave reaction device (17) is filled with a hydrogen peroxide solution.