Method for producing hydrogen by coupling electrochemical oxidation of glycerol to production of dihydroxyacetone

Abstract

This invention relates to the field of hydrogen production technology, specifically to a method for producing dihydroxyacetone from glycerol via electrochemical oxidation coupled with hydrogen production. The method includes: S1 preparing a glycerol alkaline solution as the electrolyte solution, the purity of which must reach analytical grade; S2 placing the electrolyte solution prepared in S1 into an electrolytic cell, connecting the positive terminal of a power supply to the anode in the electrolytic cell, and connecting the negative terminal of the power supply to the cathode in the electrolytic cell; S3 turning on the power supply and, at a defined temperature, performing a redox reaction and a hydrogen evolution reaction to obtain dihydroxyacetone prepared by anodic oxidation, and simultaneously obtaining hydrogen gas prepared by cathode hydrogen evolution. This patent constructs a synergistic reaction system of selective anodic oxidation to dihydroxyacetone and efficient cathode hydrogen evolution by using a glycerol alkaline solution as the electrolyte solution. The glycerol alkaline solution weakens the nucleophilic attack intensity of hydroxide ions and inhibits carbon-carbon bond breaking through the in-situ protection mechanism of the glycerol carbon chain, achieving highly selective and directional synthesis of dihydroxyacetone.

Description

Technical Field

[0001] This invention relates to the field of hydrogen production technology, specifically to a method for producing hydrogen by electrochemical oxidation of glycerol to produce dihydroxyacetone coupled with hydrogen production. Background Technology

[0002] Driven by the global goal of carbon neutrality, green hydrogen has attracted much attention as a clean energy carrier. The mainstream hydrogen production technology is usually water electrolysis, but its oxygen evolution reaction (OER) produces useless oxygen and the hydrogen production rate is slow.

[0003] Glycerin, a polyol, is a byproduct of the biodiesel industry, and its global production is in surplus. Replacing OER with OER coupled cathode hydrogen evolution with glycerin oxidation can produce valuable substances such as formic acid, dihydroxyacetone, and oxalic acid at the anode. Dihydroxyacetone is a high-value product with strong demand in cosmetics and pharmaceuticals. Existing technologies typically limit the yield of these substances by optimizing the catalyst structure. This is achieved by altering the electronic structure of the catalyst's central site or adjusting the acidity / basicity or hydrophilicity / lipophilicity of the surface adsorption sites, thereby influencing the stability and conversion pathway of the reaction intermediates and ultimately achieving the targeted synthesis of dihydroxyacetone.

[0004] Existing technologies have the following limitations: First, the alkaline environment itself is highly nucleophilic, and the thermodynamic tendency of glycerol carbon-carbon bond breaking is difficult to completely suppress by catalysts, easily generating low-value byproducts such as formic acid, resulting in insufficient selectivity for dihydroxyacetone. Second, selective catalysts often rely on precious metals, which are costly, and reaction intermediates tend to accumulate on the catalyst surface, leading to poisoning and deactivation of active sites and poor long-term stability. Summary of the Invention

[0005] Given that existing technologies cannot achieve completely selective synthesis of dihydroxyacetone, and that catalyst selection is costly, reaction intermediates tend to accumulate on the catalyst surface, resulting in poor long-term stability, this invention provides a method for the electrochemical oxidation of glycerol to produce dihydroxyacetone coupled with hydrogen production.

[0006] This invention provides a method for producing dihydroxyacetone from electrochemically oxidized glycerol coupled with hydrogen production, comprising:

[0007] S1: A glycerol alkaline solution is prepared as the electrolyte solution, and the purity of the glycerol alkaline solution must reach the analytical grade.

[0008] S2: Place the electrolyte solution prepared in S1 into the electrolytic cell, connect the positive terminal of the power supply to the anode in the electrolytic cell, and connect the negative terminal of the power supply to the cathode in the electrolytic cell.

[0009] S3: Turn on the power supply and carry out oxidation-reduction reaction and hydrogen evolution reaction at a limited temperature to obtain dihydroxyacetone prepared by anodic oxidation, and simultaneously obtain hydrogen gas prepared by cathodic hydrogen evolution.

[0010] Furthermore, in step S1, a glycerol alkaline solution is prepared as the electrolyte solution, and the purity of the glycerol alkaline solution needs to reach the analytical grade, specifically including:

[0011] S11: Weigh 0.1 mol / L to 2.5 mol / L of borate, 1.5 mol / L to 2.5 mol / L of soluble strong base, and 0.05 mol / L to 0.15 mol / L of glycerol solution using an electronic balance.

[0012] S12: Prepare 1L of deionized water.

[0013] S13: Add the weighed borate, soluble strong alkali and glycerol solution to 1L of deionized water in sequence, stir thoroughly for 30min, and prepare a glycerol alkali solution with a pH value in the range of 12.5~10.3.

[0014] Furthermore, the borate includes at least one of tetraborate, sodium perborate, boric acid, and sodium tetraphenylborate.

[0015] Furthermore, the soluble strong base includes at least one of sodium hydroxide, potassium hydroxide, lithium hydroxide, and calcium hydroxide.

[0016] Furthermore, the electrolytic cell is H-shaped and includes: an anode cell, a cathode cell, and an ion exchange membrane disposed between the anode cell and the cathode cell; the anode element is installed in the anode cell, and the cathode element is installed in the cathode cell.

[0017] Furthermore, the anode element is one of nickel hydroxide, cobalt hydroxide, and copper oxide.

[0018] Furthermore, the cathode element is one of platinum, nickel, or a nickel-molybdenum alloy.

[0019] Furthermore, a reference electrode is added to the electrolyte tank, and the reference electrode is one of metallic silver, silver chloride, or saturated potassium chloride.

[0020] Furthermore, in step S3, the potential of the power supply is set to 1.40V~1.57V, and the limited temperature is 20℃~25℃.

[0021] Furthermore, in step S3, the dihydroxyacetone Faraday efficiency ranges from 82% to 90%, and the purity of the hydrogen gas ranges from greater than or equal to 95%.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] This invention patent constructs a synergistic reaction system for the selective anodic oxidation to dihydroxyacetone and efficient hydrogen evolution at the cathode by using a glycerol alkaline solution as the electrolyte solution. Specifically, the prepared electrolyte solution is placed in an electrolytic cell, the positive terminal of the power supply is connected to the anode in the electrolytic cell, and the negative terminal of the power supply is connected to the cathode in the electrolytic cell. When the power is turned on, an oxidation reaction occurs at the anode to oxidize and reduce glycerol to dihydroxyacetone, and simultaneously, a hydrogen evolution reaction occurs at the cathode to convert the hydrogen from glycerol into high-purity hydrogen gas. Glycerol contains high-purity hydrogen ions, allowing for the production of higher-purity hydrogen gas during the hydrogen evolution reaction compared to existing technologies. The application of the glycerol alkaline solution weakens the nucleophilic attack intensity of hydroxide ions and effectively inhibits carbon-carbon bond breaking through the in-situ protection mechanism of the glycerol carbon chain, fundamentally changing the reaction pathway and achieving highly selective and directional synthesis of high-value-added dihydroxyacetone.

[0024] It should be understood that the description in the Summary of the Invention is not intended to limit the key or essential features of the embodiments of the present invention, nor is it intended to restrict the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] Figure 1 Flowchart of a hydrogen production process coupled with electrochemical oxidation of glycerol to produce dihydroxyacetone.

[0027] Figure 2 Flowchart for the preparation of glycerol alkaline solution.

[0028] Figure 3 Bar chart showing the effect of glycerol alkaline solutions with different pH values ​​on the production of dihydroxyacetone.

[0029] Figure 4 A bar chart showing the effect of different borate contents on the Faraday efficiency of dihydroxyacetone production.

[0030] Figure 5 Line graph showing the effect of different glycerol selections on dihydroxyacetone yield.

[0031] Figure 6 The graph shows the yield of dihydroxyacetone synthesized from pure glycerol over time.

[0032] Figure 7 The graph shows the yield of dihydroxyacetone synthesized from crude glycerol over time.

[0033] Figure 8 A flow chart of the reaction process for producing dihydroxyacetone from glycerol.

[0034] Figure 9The bar chart shows the effect of borate content on the concentration of dihydroxyacetone produced. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0036] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0037] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0038] Please refer to Figures 1-9 This invention provides a method for producing dihydroxyacetone via electrochemical oxidation of glycerol coupled with hydrogen production, comprising:

[0039] S1: A glycerol alkaline solution is prepared as the electrolyte solution, and the purity of the glycerol alkaline solution must reach the analytical grade.

[0040] S2: Place the electrolyte solution prepared in S1 into the electrolytic cell, connect the positive terminal of the power supply to the anode in the electrolytic cell, and connect the negative terminal of the power supply to the cathode in the electrolytic cell.

[0041] S3: Turn on the power to carry out the oxidation-reduction reaction and hydrogen evolution reaction, obtain dihydroxyacetone prepared by anodic oxidation, and simultaneously obtain hydrogen gas prepared by cathode hydrogen evolution.

[0042] In some embodiments of this application, a synergistic reaction system for the selective anodic oxidation to dihydroxyacetone and efficient hydrogen evolution at the cathode was constructed by using a glycerol alkaline solution as the electrolyte solution. Specifically, the prepared electrolyte solution was placed in an electrolytic cell, the positive terminal of the power supply was connected to the anode in the electrolytic cell, and the negative terminal of the power supply was connected to the cathode in the electrolytic cell. The power was turned on, causing an oxidation reaction at the anode to oxidize and reduce glycerol to dihydroxyacetone, while simultaneously a hydrogen evolution reaction at the cathode to evolve glycerol into high-purity hydrogen gas. Glycerol contains high-purity hydrogen ions, allowing for the production of higher-purity hydrogen gas during the hydrogen evolution reaction compared to existing technologies. The application of the glycerol alkaline solution weakens the nucleophilic attack intensity of hydroxide ions and effectively inhibits carbon-carbon bond breaking through the in-situ protection mechanism of the glycerol carbon chain, fundamentally changing the reaction pathway and achieving highly selective and directional synthesis of high-value-added dihydroxyacetone.

[0043] In some embodiments of this application, in step S1, preparing a glycerol alkaline solution as an electrolyte solution, wherein the purity of the glycerol alkaline solution needs to reach analytical grade, specifically includes:

[0044] S11: Weigh 0.1 mol / L to 2.5 mol / L of borate, 1.5 mol / L to 2.5 mol / L of soluble strong base, and 0.05 mol / L to 0.15 mol / L of glycerol solution using an electronic balance.

[0045] S12: Prepare 1L of deionized water.

[0046] S13: Add the weighed borate, soluble strong alkali and glycerol solution to 1L of deionized water in sequence, stir thoroughly for 30min, and prepare a glycerol alkali solution with a pH value in the range of 12.5~10.3.

[0047] Furthermore, the borate ions in the borate ion undergo a reversible esterification reaction with the ortho-hydroxyl group in the glycerol molecule through complexation, forming a cyclic borate ester chelate. The primary hydroxyl group is locked by the steric hindrance effect, allowing the secondary hydroxyl group to be exposed and preferentially adsorbed at the anodic active site, thereby kinetically guiding the selective oxidation to generate dihydroxyacetone.

[0048] Meanwhile, the newly generated dihydroxyacetone, due to its α-hydroxyketone structure, can be rapidly captured again by borate ions in the solution to form dihydroxyacetone-borate chelate, which reduces the residence time of dihydroxyacetone on the electrode surface and the thermodynamic driving force for further oxidation and dehydrogenation, effectively inhibiting carbon-carbon bond breaking and deep oxidation reactions, and further inhibiting the formation of byproducts such as formic acid and oxalic acid.

[0049] Furthermore, the anodic oxidation reaction and the cathode hydrogen evolution reaction occur simultaneously. The glycerol oxidation reaction at the anode can achieve a dihydroxyacetone conversion rate of greater than or equal to 90%, and the proton reduction hydrogen evolution reaction occurs simultaneously at the cathode. Since the glycerol alkaline solution contains high-purity hydrogen ions, high-purity hydrogen gas can be produced in the hydrogen evolution reaction, thereby improving the overall Faraday efficiency.

[0050] In some embodiments of this application, the borate includes at least one of tetraborate, sodium perborate, boric acid, and sodium tetraphenylborate.

[0051] In some embodiments of this application, the soluble strong base includes at least one of sodium hydroxide, potassium hydroxide, lithium hydroxide, and calcium hydroxide.

[0052] In some embodiments of this application, the electrolytic cell is H-shaped and includes: an anode cell, a cathode cell, and an ion exchange membrane disposed between the anode cell and the cathode cell; the anode element is installed in the anode cell, and the cathode element is installed in the cathode cell.

[0053] To further explain, the ion exchange membrane only allows hydroxide ions to pass through, physically separating the liquid-phase reaction at the anode from the gas-phase system at the cathode. On the one hand, this prevents the dihydroxyacetone generated at the anode from migrating to the cathode and being reduced, ensuring a high selective yield of dihydroxyacetone. On the other hand, since no oxygen is produced at the anode, cross-contamination of hydrogen by oxygen is completely avoided, allowing high-purity hydrogen to be released at the cathode without the need for subsequent purification, thus saving purification steps.

[0054] Furthermore, the complete assembly of the H-type electrolyzer improves reaction stability, avoids errors such as poor contact, electrolyzer leakage, and low Faraday efficiency, and provides favorable conditions for subsequent electrocatalysis.

[0055] In some embodiments of this application, the anode element is one of nickel hydroxide, cobalt hydroxide, and copper oxide.

[0056] In some embodiments of this application, the cathode element is one of platinum, nickel, or a nickel-molybdenum alloy.

[0057] In some embodiments of this application, a reference electrode is added to the electrolyte tank, and the reference electrode is one of metallic silver, silver chloride, or saturated potassium chloride.

[0058] In some embodiments of this application, in step S3, the potential of the power supply is set to 1.40V~1.57V, and the temperature is limited to 20℃~25℃.

[0059] In some embodiments of this application, in step S3, the dihydroxyacetone Faraday efficiency ranges from 82% to 90%, and the purity of hydrogen ranges from greater than or equal to 95%.

[0060] The specific embodiments provided in this application are as follows:

[0061] Example 1: 2 mol / L boric acid, 1.5 mol / L sodium hydroxide, and 0.1 mol / L glycerol were weighed and added one by one to 1 L of deionized water. The mixture was stirred thoroughly for 30 minutes to obtain a glycerol alkaline solution with a pH of 11.8. Cobalt hydroxide was used as the anode, platinum as the cathode, and silver chloride as the reference electrode. Electrocatalysis was performed at a potential of 1.57 V and a temperature of 20 °C. Dihydroxyacetone with a Faraday efficiency of 90% was obtained by anodic oxidation, and hydrogen gas with a purity of 98.7% was obtained by hydrogen evolution at the cathode.

[0062] Example 2: 2 mol / L boric acid, 2 mol / L sodium hydroxide, and 0.1 mol / L glycerol were weighed and added one by one to 1 L of deionized water, and stirred thoroughly for 30 minutes to obtain a glycerol alkaline solution with a pH of 12.5. Nickel hydroxide was used as the anode, platinum as the cathode, and silver as the reference electrode. Electrocatalysis was performed at a potential of 1.50 V and a temperature of 25 °C. Dihydroxyacetone with a Faraday efficiency of 88% was obtained by anodic oxidation, and hydrogen gas with a purity of 97.8% was obtained by hydrogen evolution at the cathode.

[0063] Example 3: 0.1 mol / L boric acid, 2.2 mol / L potassium hydroxide, and 0.1 mol / L glycerol were weighed and added one by one to 1 L of deionized water, and stirred thoroughly for 30 minutes to obtain a glycerol alkaline solution with a pH of 10.5. Copper oxide was used as the anode, nickel metal as the cathode, and silver chloride as the reference electrode. Electrocatalysis was performed at a potential of 1.52 V and a temperature of 22 °C. Dihydroxyacetone with a Faraday efficiency of 87% was obtained by anodic oxidation, and hydrogen gas with a purity of 96% was obtained by hydrogen evolution at the cathode.

[0064] Example 4: 1.5 mol / L tetraborate, 2.5 mol / L lithium hydroxide, and 0.05 mol / L glycerol were weighed and added one by one to 1 L of deionized water, and stirred thoroughly for 30 minutes to obtain a glycerol alkaline solution with a pH of 10.3. Cobalt hydroxide was used as the anode, nickel-molybdenum alloy as the cathode, and saturated potassium chloride as the reference electrode. Electrocatalysis was performed at a potential of 1.55 V and a temperature of 24 °C. Dihydroxyacetone with a Faraday efficiency of 82% was obtained by anodic oxidation, and hydrogen gas with a purity of 95% was obtained by hydrogen evolution at the cathode.

[0065] Example 5: 2.2 mol / L sodium tetraphenylborate, 2 mol / L sodium hydroxide, and 0.1 mol / L glycerol were weighed and added one by one to 1 L of deionized water, and stirred thoroughly for 30 minutes to obtain a glycerol alkaline solution with a pH of 12. Cobalt hydroxide was used as the anode, platinum as the cathode, and silver as the reference electrode. Electrocatalysis was performed at a potential of 1.57 V and a temperature of 25 °C. Dihydroxyacetone with a Faraday efficiency of 86.5% was obtained by anodic oxidation, and hydrogen gas with a purity of 96.8% was obtained by hydrogen evolution at the cathode.

[0066] Example 6: 2 mol / L sodium perborate, 2.3 mol / L sodium hydroxide, and 0.15 mol / L glycerol were weighed and added one by one to 1 L of deionized water, and stirred thoroughly for 30 minutes to obtain a glycerol alkaline solution with a pH of 11.2. Copper oxide was used as the anode, platinum metal as the cathode, and silver chloride as the reference electrode. Electrocatalysis was performed at a potential of 1.52 V and a temperature of 22 °C. Dihydroxyacetone with a Faraday efficiency of 88.9% was obtained by anodic oxidation, and hydrogen gas with a purity of 97% was obtained by hydrogen evolution at the cathode.

[0067] like Figure 3 As shown, by controlling the glycerol content in 1 L of deionized water to be 0.1 mol / L and the borate content to be 2.0 mol / L, adding soluble strong bases with different pH values ​​yields glycerol-based solutions of varying pH. Therefore, the effect of soluble strong bases with different pH values ​​on the production of dihydroxyacetone can be determined. The peak production of dihydroxyacetone occurs at a pH of 11.8. Production decreases at pH values ​​greater than 11.8 or less than 11.8.

[0068] like Figure 4 As shown, when the glycerol content in 1 L of deionized water is controlled at 0.1 mol / L and the pH of the glycerol alkaline solution is 11.8, the effect of adding different amounts of borate on the yield of dihydroxyacetone can be obtained. The peak yield of dihydroxyacetone is observed when the added borate content is 2 mol / L; when the added borate content is less than 2 mol / L, the yield of dihydroxyacetone decreases rapidly and gradually; when the added borate content is greater than 2 mol / L, the yield of dihydroxyacetone decreases slowly and gradually.

[0069] Therefore, by Figure 3 and Figure 4 It can be seen that when the glycerol content in 1L of deionized water is 0.1mol / L, the maximum yield of dihydroxyacetone is achieved when 2mol / L of borate is added and the pH of the glycerol alkaline solution is adjusted to 11.8.

[0070] like Figure 5As shown in the figure, when the borate content in 1L of deionized water is controlled at 2mol / L, three groups were selected: 0.1mol / L pure glycerol, 0.1mol / L crude glycerol, and no glycerol added, serving as control groups. Electrocatalytic oxidation reactions were carried out under the same conditions. The figure shows that the oxidation potential of the pure glycerol group is significantly lower than that of the other two groups. Therefore, the addition of pure glycerol is more conducive to the oxidation reaction. Moreover, the pure glycerol group has a full voltage range of 1.3V~2.2V. Within this range, the current density of the pure glycerol group is consistently higher than that of the other two groups, and the advantage is obvious in the 1.8~2.2V range. Therefore, the pure glycerol group has the best catalytic activity.

[0071] like Figure 6 As shown, when the content of borate in 1L of deionized water is controlled at 2mol / L and the content of pure glycerol is 0.1mol / L, and the pH value of the synthesized glycerol alkaline solution is adjusted to 11.8, the concentration of synthesized dihydroxyacetone gradually increases with the increase of oxidation reaction and hydrogen evolution reaction time, and the hydrogen gas is in a stable synthesis state with a concentration greater than 95%. During this process, the Faraday efficiency is stable between 80% and 90%.

[0072] like Figure 7 As shown, when the content of borate in 1L of deionized water is controlled at 2mol / L and the content of crude glycerol at 0.1mol / L, and the pH value of the synthesized glycerol alkaline solution is adjusted to 11.8, the concentration of synthesized dihydroxyacetone gradually increases with the increase of oxidation reaction and hydrogen evolution reaction time, and the hydrogen gas is in a stable synthesis state with a concentration greater than 95%. During this process, the Faraday efficiency is stable between 80% and 90%.

[0073] Figure 7 and Figure 6 In comparison, the concentration of dihydroxyacetone synthesized using crude glycerol is significantly lower than that synthesized using pure glycerol. Therefore, the synthesis of dihydroxyacetone using pure glycerol is the most efficient. However, in practical applications, the yield of crude glycerol is far greater than that of pure glycerol, typically being a large-scale byproduct of industrial production lines such as biodiesel manufacturing. Pure glycerol, on the other hand, is obtained through further processing of crude glycerol. Figure 7 As shown, crude glycerol can achieve a significantly better effect when applied in this patent. Therefore, crude glycerol can be used to synthesize glycerol alkaline solution without significantly affecting the yield of dihydroxyacetone.

[0074] like Figure 8As shown, glycerol undergoes an esterification reaction with borate, where the borate ion preferentially coordinates with the two primary hydroxyl groups at positions 1 and 3 of glycerol and undergoes dehydration, retaining only the intermediate secondary hydroxyl group to form glycerol borate ester. Glycerol borate ester undergoes a ketalization reaction with acetone under acidic catalysis to form a cyclic ketal compound. Under the action of an oxidizing agent, the protected secondary hydroxyl group in the ketal compound is oxidized to a carbonyl group to form a dicarbonyl ketal compound. Finally, under acidic conditions, hydrolysis occurs, and the ketal bond and the borate ester bond break simultaneously, releasing dihydroxyacetone.

[0075] like Figure 9 As shown, when the glycerol content in 1L of deionized water is controlled at 0.1 mol / L, and the pH of the synthesized glycerol alkaline solution is adjusted to 11.8, different concentrations of dihydroxyacetone can be obtained by adding different amounts of borate. Experiments showed that the peak concentration of dihydroxyacetone was obtained when the borate content was 2 mol / L. When the borate content was less than 2 mol / L, the concentration decreased rapidly, and when the borate content was higher than 2 mol / L, the concentration decreased slowly. In summary, the experiments indicate that the peak concentration of dihydroxyacetone is achieved when the glycerol content in 1L of deionized water is 0.1 mol / L, the borate content is 2 mol / L, and the pH of the synthesized glycerol alkaline solution is adjusted to 11.8. At this point, both the concentration and Faraday efficiency are at their highest values.

[0076] It should be understood that the specific embodiments described above are for illustrative purposes only and are not intended to limit the scope of the invention. Obvious variations or modifications derived from the spirit of the invention are still within the scope of protection of the invention.

Claims

1. A method for producing dihydroxyacetone via electrochemical oxidation of glycerol coupled with hydrogen production, characterized in that, include: S1: A glycerol alkaline solution is prepared as the electrolyte solution, and the purity of the glycerol alkaline solution must reach the analytical grade. S2: Place the electrolyte solution prepared in S1 into the electrolytic cell, connect the positive terminal of the power supply to the anode in the electrolytic cell, and connect the negative terminal of the power supply to the cathode in the electrolytic cell. S3: Turn on the power supply and carry out oxidation-reduction reaction and hydrogen evolution reaction at a limited temperature to obtain dihydroxyacetone prepared by anodic oxidation, and simultaneously obtain hydrogen gas prepared by cathode hydrogen evolution.

2. The method for producing dihydroxyacetone from electrochemically oxidized glycerol coupled with hydrogen production according to claim 1, characterized in that, In step S1, a glycerol alkaline solution is prepared as the electrolyte solution. The purity of the glycerol alkaline solution must reach the analytical grade, specifically including: S11: Weigh 0.1 mol / L to 2.5 mol / L of borate, 1.5 mol / L to 2.5 mol / L of soluble strong base, and 0.05 mol / L to 0.15 mol / L of glycerol solution using an electronic balance; S12: Prepare 1L of deionized water; S13: Add the weighed borate, soluble strong alkali and glycerol solution to 1L of deionized water in sequence, stir thoroughly for 30min, and prepare a glycerol alkali solution with a pH value in the range of 12.5~10.

3.

3. The method for producing dihydroxyacetone from electrochemically oxidized glycerol coupled with hydrogen production according to claim 2, characterized in that, The borates include at least one of tetraborate, sodium perborate, boric acid, and sodium tetraphenylborate.

4. The method for producing dihydroxyacetone from electrochemically oxidized glycerol coupled with hydrogen production according to claim 2, characterized in that, The soluble strong base includes at least one of sodium hydroxide, potassium hydroxide, lithium hydroxide, and calcium hydroxide.

5. The method for producing dihydroxyacetone from electrochemically oxidized glycerol coupled with hydrogen production according to claim 1, characterized in that, The electrolytic cell is H-shaped and includes: an anode cell, a cathode cell, and an ion exchange membrane disposed between the anode cell and the cathode cell; The anode component is installed in the anode groove, and the cathode component is installed in the cathode groove.

6. The method for producing dihydroxyacetone from electrochemically oxidized glycerol coupled with hydrogen production according to claim 1, characterized in that, The anode is one of nickel hydroxide, cobalt hydroxide, and copper oxide.

7. The method for producing dihydroxyacetone from electrochemically oxidized glycerol coupled with hydrogen production according to claim 1, characterized in that, The cathode element is one of platinum, nickel, or a nickel-molybdenum alloy.

8. The method for producing dihydroxyacetone from electrochemically oxidized glycerol coupled with hydrogen production according to claim 1, characterized in that, A reference electrode is added to the electrolyte tank, and the reference electrode is one of metallic silver, silver chloride, or saturated potassium chloride.

9. The method for producing dihydroxyacetone by electrochemical oxidation of glycerol coupled with hydrogen production according to claim 1, characterized in that, In step S3, the potential of the power supply is set to 1.40V~1.57V, and the limited temperature is 20℃~25℃.

10. The method for producing dihydroxyacetone from electrochemically oxidized glycerol coupled with hydrogen production according to claim 1, characterized in that, In step S3, the dihydroxyacetone Faraday efficiency ranges from 82% to 90%, and the purity of the hydrogen gas ranges from greater than or equal to 95%.

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