CN213113538U

CN213113538U - Expandable efficient synthesis H2O2 reactor device based on plug-in capsule cathode

Info

Publication number: CN213113538U
Application number: CN202021727920.0U
Authority: CN
Inventors: 李楠; 李欣萍
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2020-08-18
Filing date: 2020-08-18
Publication date: 2021-05-04
Anticipated expiration: 2030-08-18

Abstract

The utility model discloses an expanded high-efficient synthetic H based on plug-in capsule negative pole₂O₂The reactor device adopts a plug-in capsule cathode and has simple structureSingly, convenient to detach installation, device expansibility is strong. The pluggable capsule cathode is a cylindrical air diffusion cathode made of carbon black-graphite-PTFE and is fixed through a clamping groove, the inner side of the capsule cathode cylinder is in direct contact with air, and the outer side of the capsule cathode cylinder is in contact with electrolyte. The anode is made of noble metal, metal alloy or metal composite metal oxide and the like and is vertically inserted into the anode tank. The anode plates are respectively connected to the positive pole of the direct current power supply, and the plug-in capsule cathodes are respectively connected to the negative pole of the direct current power supply. Four pairs of cathodes and anodes are orderly arranged, the cathodes are plug-in capsule cathodes, the anodes are titanium/iridium dioxide composite metal plates, and after the operation for 20min under the condition that the current is 3.76A, H in an electrode chamber₂O₂The concentration was 1151.3 mg/L.

Description

Glue based on plug-inExpandable efficient synthesis of H for balloon cathodes2O2Reactor device

Technical Field

The utility model relates to a field is the electrochemical synthesis field, in particular to scalable high-efficient synthetic H based on plug-in capsule negative pole₂O₂A reactor device.

Background

Hydrogen peroxide (H)₂O₂) Is a high-efficiency and green strong oxidant, and is widely applied to various fields of paper making, textile, chemical synthesis, military, electronics, food, medicines, cosmetics, environmental protection, metallurgy and the like. By 2018, the global hydrogen peroxide consumption was about 650 ten thousand tons, and this value has been rapidly increasing since then, with a domestic market share of over 50%.

Oxidation of Anthraquinones (AO) is currently used for H production₂O₂By the conventional method of (1), until now, H produced by the AO method₂O₂Accounting for 95% and 99% of global and domestic yields, respectively. However, this method is considered to be an uneconomical and environmentally friendly production method because of large energy input, complicated steps, many side reactions, and many waste products. And the produced high concentration of H₂O₂Aqueous solutions present safety hazards in terms of transportation, storage and handling.

Electrochemical in situ production of H₂O₂Provides an economic and environment-friendly way. O via the two-electron pathway of Oxygen Reduction Reaction (ORR)₂Electrochemical reduction to H₂O₂，H₂O₂Can be generated at the cathode surface and concentration build-up can be achieved in a continuous electrolytic process. Currently, air breathing cathodes are a very promising form of cathode in electrochemical systems. The air breathing cathode consists of a hydrophobic air diffusion layer (GDL) exposed to air, a steel mesh (SSM) as a current collector in the middle, and a Catalyst Layer (CL) immersed in an electrolyte solution, wherein oxygen in the air diffuses from the diffusion layer into the catalyst layer, combines with hydrogen ions, and reacts under the catalysis of active sites to generate H₂O₂. In addition, currently most of H₂O₂In situ synthesisThe method is carried out in a laboratory scale, and the reactor has small volume, low yield, low expansibility and high reaction efficiency on H₂O₂The adjustment of the concentration is limited.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problems existing above, designing an expandable high-efficiency synthetic H based on a plug-in capsule cathode₂O₂A reactor device. The device has the characteristics of simple structure, low manufacturing cost, strong electrode logarithm adjustability, strong expansibility and the like, and can effectively improve H₂O₂Synthesis efficiency, realization of high efficiency H₂O₂Concentration regulation and reactor amplification, and H can be realized by regulating the number of electrodes₂O₂And (4) adjusting the concentration.

The utility model aims at realizing through the following technical scheme: expandable efficient synthesis H based on plug-in capsule cathode₂O₂The reactor device is provided with a reactor device,

the pluggable capsule cathode is formed by rolling an air diffusion cathode made of carbon black-graphite-PTFE, a catalyst layer and an air diffusion layer are respectively rolled to two sides of a current collector to form sheet electrodes, the sheet electrodes are rolled into a cylinder to form an inner cavity, the air diffusion layer is arranged on the inner side of the cylinder, and the catalyst layer is arranged on the outer side of the cylinder. In order to prevent water leakage, the bottom of the cathode of the capsule can be sealed by a seal head.

Furthermore, the pluggable capsule cathode is convenient to disassemble and assemble, and can be freely combined according to specific requirements. The anode plate is vertically inserted into the anode groove, the plug-in type capsule cathode is fixed through the clamping groove, the inner side of the capsule cathode cylinder is directly contacted with air, and the outer part of the capsule cathode cylinder is contacted with electrolyte. The cathodes and the anodes in the reactor are orderly and alternately arranged, can be expanded according to specific requirements, and can synthesize hydrogen peroxide with different concentrations by adjusting the arrangement mode of the electrodes and optimizing the ratio of the area of the cathodes to the volume of the solution.

Furthermore, the anode is vertically inserted into the anode tank by adopting an anode plate, and the anode plate can be made of noble metals (such as platinum group metals), heavy metals (such as Ni and Co), metal alloys, metal composite metal oxides (such as Ti-based mixed oxide titanium iridium electrodes and titanium ruthenium electrodes) and the like.

Furthermore, the anode plates are respectively connected to the positive pole of the direct current power supply, and the plug-in capsule cathodes are respectively connected to the negative pole of the direct current power supply.

Advantageous effects

1. The device selects the pluggable capsule cathode rolled by the carbon black-graphite-PTFE air diffusion cathode, has simple structure, convenient direct use and flexible arrangement, and can increase the diameter and the height to ensure the enough cathode area of the reactor device for matching and amplifying.

2. The device expansibility is strong, can expand from length, width and high three dimension and enlarge, and the plug-in capsule negative pole of corresponding size and quantity is collocation to the amplification device.

3. System for H₂O₂The concentration can be controlled by adjusting the current, the electrifying time, the number of the cathode and the anode, the area of the cathode of the capsule, the volume ratio of the solution and the like, the operation is simple and convenient, and the adjustable range is large.

4. The system has low cost, and the organic glass and the graphite-carbon black-PTFE air diffusion cathode are cheap and easy to obtain.

Drawings

FIG. 1 is a schematic structural diagram of a pluggable capsule cathode;

FIG. 2 is a schematic diagram of high-efficiency synthesis of H by using a plug-in capsule cathode₂O₂Schematic diagram of the easy-to-expand reactor device of (1);

FIG. 3 is an expanded conceptual view of a reactor apparatus.

Reference numerals: 1-air diffusion layer, 2-steel mesh, 3-catalyst layer, 4-end enclosure, 5-cathode tank, 6-vent hole, 7-anode tank, 8-anode plate, 9, 10-capsule cathode.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

The utility model provides an expanded high-efficient synthetic H based on plug-in capsule negative pole₂O₂A reactor device. The main body of the device is made of organic glass material, and the anode adopts an anode plate (Length is h, width is D) is vertically inserted into the anode slot, the cathode is inserted into the clamping slot and fixed by adopting a plug-in capsule cathode (diameter is D, height is h), the anode plate and the capsule cathode are orderly arranged in the single-chamber reactor, and the distance between the cathode and the anode is adjustable. The enlargement and expansion of the reactor can be achieved by using different diameters, different heights and different numbers of capsule cathodes. The assembled reactor is connected with a direct current power supply, the anode plate is respectively connected with the positive pole of the direct current power supply, the capsule cathode is respectively connected with the negative pole of the direct current power supply, and Na with the concentration of 0.05M is injected into the cavity₂SO₄And the electrolyte controls the operation condition of the reactor by adjusting the current, the electrifying time and the electrode number, and samples are taken from the sampling port 9.

Example 1

The device adopts four pairs of cathodes and anodes which are alternately arranged, the diameter of the cathode of the plug-in capsule is 3cm, the height of the cathode is 5cm, the anode adopts a titanium/iridium dioxide composite metal plate (the size is 3cm x 5cm), the cathodes and the anodes are arranged in a crossed and ordered way, the distance between the cathodes and the anodes is 3.5cm, and the net volume of an electrode chamber is about 580 ml. The cathode surface area/reactor volume (A/V) was 0.32cm²/ml。

580mL of Na with a concentration of 0.05M was injected into the chamber₂SO₄Electrolyte, connecting the titanium/iridium dioxide composite metal plate with the positive electrode of a direct current power supply, connecting the negative electrode with the negative electrode of the direct current power supply, turning on a power switch, adjusting the current to 2.82A, operating for 20min, and detecting H by using a potassium titanium oxalate spectrophotometry₂O₂Concentration, H in the electrode compartment₂O₂The concentration was 792.2mg/L, and the current efficiency was 77%.

580mL of Na with a concentration of 0.05M was injected into the chamber₂SO₄Electrolyte, connecting the titanium/iridium dioxide composite metal plate with the positive electrode of a direct current power supply, connecting the negative electrode with the negative electrode of the direct current power supply, turning on a power switch, adjusting the current to 3.76A, operating for 20min, and detecting H by using a potassium titanium oxalate spectrophotometry₂O₂Concentration, H in the electrode compartment₂O₂The concentration was 1151.3mg/L, and the current efficiency was 84%.

580mL of Na with a concentration of 0.05M was injected into the chamber₂SO₄An electrolyte prepared by mixing titanium/iridium dioxideThe composite metal plates are respectively connected with the positive electrode of a direct current power supply, the negative electrode of the composite metal plates are respectively connected with the negative electrode of the direct current power supply, a power switch is turned on, the current is adjusted to be 4.70A, and after the composite metal plates run for 20min, the titanium potassium oxalate spectrophotometry is used for detecting H₂O₂Concentration, H in the electrode compartment₂O₂The concentration can reach 1298.7mg/L, and the current efficiency is 75%.

Example 2

The cathodes and the anodes in the reactor are orderly and alternately arranged, can be expanded according to specific requirements, and can synthesize hydrogen peroxide with different concentrations by optimizing the area ratio of the cathodes to the volume ratio of the solution by adjusting the size of the electrodes, the distance between the anode and the cathode, the number of the electrodes and the arrangement mode of the electrodes.

The device adopts four pairs of cathodes and anodes to be alternately arranged, the diameter of the cathode of the plug-in capsule is 5cm, the height of the cathode is 5cm, the size of the anode plate is 5cm x 5cm, the cathodes and the anodes are crossly and orderly arranged, the distance is 3.5cm, and the net volume of an electrode chamber is about 580 ml. The cathode surface area/reactor volume (A/V) was 0.53cm²/ml。

The device adopts four pairs of cathodes and anodes to be alternately arranged, the diameter of the cathode of the plug-in capsule is 3cm, the height of the cathode of the plug-in capsule is 10cm, the size of the anode plate is 3cm x 10cm, the cathodes and the anodes are crossly and orderly arranged, the spacing is 3.5cm, and the net volume of an electrode chamber is 1160 ml. The cathode surface area/reactor volume (A/V) was 0.32cm²/ml。

The device adopts four pairs of cathodes and anodes to be alternately arranged, the diameter of the cathode of the plug-in capsule is 3cm, the height of the cathode is 5cm, the size of the anode plate is 3cm x 10cm, the cathodes and the anodes are crossly and orderly arranged, the distance is 2.5cm, and the net volume of an electrode chamber is about 360 ml. The cathode surface area/reactor volume (A/V) was 0.53cm²/ml。

The device adopts six pairs of cathodes and anodes to be alternately arranged, the diameter of the cathode of the plug-in capsule is 3cm, the height of the cathode of the plug-in capsule is 5cm, the size of the anode plate is 3cm x 5cm, the cathodes and the anodes are crossly and orderly arranged, the distance is 3.5cm, and the net volume of an electrode chamber is about 1050 ml. The cathode surface area/reactor volume (A/V) was 0.34cm²/ml。

Nine pairs of cathodes and anodes are alternately arranged, the diameter of the cathode of the plug-in capsule is 3cm, the height of the cathode of the plug-in capsule is 5cm, the size of the anode plate is 3cm x 5cm, the cathodes and the anodes are arranged in a crossed and ordered mode, the distance between the cathodes and the anodes is 3.5cm, and the net volume of the reactor is 1800 ml. Cathode surface area/transThe volume (A/V) of the reactor is 0.29cm²/ml。

It should be understood that the embodiments discussed herein are for illustrative purposes only and that modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the purview of the appended claims.

Claims

1. Expandable efficient synthesis H based on plug-in capsule cathode₂O₂The reactor device is characterized in that the reactor device is assembled by adopting a plug-in capsule cathode expansion, the plug-in capsule cathode is a cylindrical air diffusion cathode made of carbon black-graphite-PTFE, a catalyst layer and an air diffusion layer are respectively rolled to two sides of a steel mesh and then rolled into a cylinder to form an inner cavity, the air diffusion layer is arranged on the inner side of the cylinder, and the catalyst layer is arranged on an electrode on the outer side of the cylinder.

2. Scalable high-efficiency synthesis H based on pluggable capsule cathodes according to claim 1₂O₂The reactor device is characterized in that the anode is vertically inserted into an anode tank by adopting an anode plate, and the anode plate can be made of noble metals, heavy metals, metal alloys and metal composite metal oxides.

3. Scalable high-efficiency synthesis H based on pluggable capsule cathodes according to claim 1₂O₂The reactor device is characterized in that the anode plate is vertically inserted into the anode groove, the plug-in capsule cathode is fixed through the clamping groove, the inner side of the capsule cathode cylinder is directly contacted with air, and the outer part of the capsule cathode cylinder is contacted with electrolyte;

the cathodes and the anodes in the reactor are orderly and alternately arranged, and hydrogen peroxide with different concentrations is synthesized by adjusting the arrangement mode of the electrodes and optimizing the area of the cathodes and the volume ratio of the solution.

4. Scalable high-efficiency synthesis H based on pluggable capsule cathodes according to claim 1₂O₂The reactor device is characterized in that a plurality of anode plates are respectively connected to direct currentThe source anode and the plurality of plug-in capsule cathodes are respectively connected to the negative electrode of the direct current power supply.

5. Scalable high-efficiency synthesis H based on pluggable capsule cathodes according to claim 1₂O₂The reactor device is characterized in that the bottom of the cathode of the capsule is sealed by a seal head.