A nitrogen and phosphorus co-doped carbon material, a preparation method and application thereof

Abstract

The present application relates to the technical field of material preparation, and particularly relates to a nitrogen and phosphorus co-doped carbon material, a preparation method and application thereof. The present application mixes a carbon precursor and water, and then performs a hydrothermal reaction to obtain a brown powder solid; the brown powder solid, a nitrogen source and a phosphorus source are mixed by ball milling, and then calcination is performed in an inert gas to obtain a nitrogen and phosphorus co-doped carbon material; the nitrogen and phosphorus co-doped carbon material prepared by the method is used for loading a noble metal Pd(OH)2 / C catalyst to prepare, and exhibits excellent catalytic activity in a six benzyl hexaazaisowurtzitane (HBIW) and a tetraacetyl dibenzyl hexaazaisowurtzitane (TADB) two-step hydrogenolysis debenzyl reaction, and greatly reduces the synthesis cost of CL-20.

Description

Technical Field

[0001] This invention relates to the field of materials preparation technology, and in particular to a nitrogen-phosphorus co-doped carbon material, its preparation method, and its application. Background Technology

[0002] Carbon materials are a class of materials with carbon as the main constituent element. They have broad development prospects and are a component of most materials, possessing many advantages: good stability, easily tunable structure, simple and readily available materials, environmental friendliness and renewability, and good electrical conductivity. They also exhibit a unique micro-regional ordered spatial arrangement of carbon atoms, making them commonly used as noble metal support carriers. After further modification, carbon materials exhibit unique chemical and physical properties, displaying characteristics difficult to replace with other materials, and are widely used in various fields. Surface modification of carbon materials, introducing different functional groups or chemical groups, can regulate the surface structure and chemical properties of carbon materials, affecting the quantity distribution of surface chemical functional groups (-COOH, -COO-, -OH, -CO, etc.) and the interaction between active components and the carbon support, thereby improving the loading and adsorption capabilities of carbon materials, giving them special properties and applications.

[0003] Hexanitrohexaazaisowrutzane (HNIW, commonly known as CL-20) is the highest-energy-level energetic compound known to date and is the best-performing single-element explosive for industrial production.

[0004]

[0005] In the CL-20 synthesis route shown above, a large amount of catalyst is required in the debenzylation process of hexabenzylhexaazaisowoodsane (HBIW), and the cage-like parent material of HBIW is very unstable, which places higher demands on the catalyst activity and stability. At the same time, more catalyst is required in the debenzylation reaction of tetraacetyldibenzylhexaazaisowoodsane (TADB). The two-step debenzylation process keeps the CL-20 synthesis cost high.

[0006] In the two-step debenzylation reaction, the solvent system and the acidity / basicity of the catalyst surface play a crucial role in the reaction. Therefore, how to reduce the particle size of noble metal particles and improve their dispersion on the carbon support surface to provide more reactive sites and reduce the synthesis cost of CL-20 has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a nitrogen-phosphorus co-doped carbon material, its preparation method, and its application, so as to solve the problems existing in the prior art.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0009] This invention provides a method for preparing nitrogen-phosphorus co-doped carbon materials, comprising the following steps:

[0010] 1) The carbon precursor and water were mixed and subjected to a hydrothermal reaction to obtain a brown powder solid;

[0011] 2) Brown powder solid, nitrogen source and phosphorus source are ball-milled and mixed, and then calcined in an inert gas to obtain nitrogen and phosphorus co-doped carbon material.

[0012] Optionally, the ball milling is performed by adding milling balls to a mixture of brown powder solid, nitrogen source, and phosphorus source;

[0013] The mass ratio of the grinding beads to the mixture is 10:1 to 50:1;

[0014] The ball milling speed is 250 r / min to 400 r / min; the ball milling time is 10 min to 60 min.

[0015] Optionally, the concentration of the carbon precursor in water is 0.1 mol / L to 4.0 mol / L.

[0016] Optionally, the hydrothermal reaction is carried out at a temperature of 170℃ to 200℃ for a duration of 20h to 24h.

[0017] Optionally, the mass ratio of the carbon precursor to the nitrogen source is 15:1 to 1:3; the mass ratio of the carbon precursor to the phosphorus source is 15:1 to 1:3.

[0018] Optionally, the carbon precursor comprises one or more of glucose, fructose, sucrose, starch, lignin, chitosan, sodium gluconate, and cellulose.

[0019] Optionally, the nitrogen source is a nitrogen-containing compound, which includes one or more of urea, dicyandiamide, melamine, hexamethylenetetramine, lysine, and ammonium salts;

[0020] The phosphorus source is a phosphorus-containing compound, which includes one or more of phytates, phosphates, triphenylphosphine, and hydrogen phosphate.

[0021] Optionally, the calcination heating rate is 1℃ / min to 10℃ / min, the temperature is 600℃ to 1400℃, and the time is 1h to 5h; the inert gas includes one or more of nitrogen, helium, and argon.

[0022] The present invention also provides a method for preparing nitrogen-phosphorus co-doped carbon materials as described above, resulting in nitrogen-phosphorus co-doped carbon materials.

[0023] This invention also provides the application of the above-mentioned nitrogen-phosphorus co-doped carbon material in the preparation of hydrogen debenzyl noble metal-based catalysts.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] In the technical solution of this invention, the carbon precursor undergoes surface dehydration, polymerization, and carbonization during hydrothermal treatment without the presence of a template. During heteroatom doping via mechanical ball milling, the original morphology is not destroyed. Simultaneously, the mechanochemical method applies mechanical force to various mixtures, increasing their surface area and contact area. Mechanical energy is generated and transferred through a solid-state ball mill. High-kinetic-energy solid grinding balls collide with the chamber walls and other solid grinding balls, crushing, bonding, breaking, and re-bonding the internal mixture particles, thereby reducing particle size and increasing strain in the sample. This allows the carbonization products to be fully mixed with nitrogen and phosphorus sources, enabling nitrogen and phosphorus to better enter the carbon skeleton during calcination, forming defects.

[0026] In the technical solution of the present invention, by adjusting the ball milling process parameters, selecting appropriate ball milling speed, time and appropriate ball-to-powder ratio, the doping effect of heteroatoms is optimized, thereby improving the preparation efficiency of carbon materials.

[0027] The nitrogen-phosphorus co-doped carbon material prepared by this invention can effectively improve the type and quantity of acidity and alkalinity on the surface of carbon materials, change the charge density distribution and bond length of carbon atoms near the dopant, increase the defect sites of carbon materials, lead to structural distortion, reduce the particle size of noble metal particles, and improve their dispersion on the surface of carbon support, so as to provide more reactive sites. The hydrogen debenzyl noble metal-based catalyst prepared using the carbon material of this invention as a support has high activity and reduces the synthesis cost of CL-20.

[0028] The nitrogen-phosphorus co-doped carbon material prepared by this invention has a high surface area and obvious porous structure; the preparation method provided is simple and mild, the process is simple, the raw materials are readily available and inexpensive, it is suitable for large-scale industrial production, and has broad application prospects.

[0029] The nitrogen-phosphorus co-doped carbon material prepared in this invention is used for the preparation of noble metal catalysts. When used in the synthesis of CL-20, it exhibits high catalytic activity in the two-step hydrogen debenzylation reaction of hexabenzylhexaazaisowulzane (HBIW) and tetraacetyldibenzylhexaazaisowulzane (TADB), which greatly reduces the synthesis cost of CL-20. Attached Figure Description

[0030] Figure 1 The images are scanning electron microscope (SEM) images of the carbon materials prepared in Examples 1-4. (a) is carbon material #1, (b) is carbon material #2, (c) is carbon material #3, and (d) is carbon material #4.

[0031] Figure 2The image shows a transmission electron microscope (STEM) image of the Pd(OH)2 / C catalyst prepared using the carbon material prepared in Example 1 as a support.

[0032] Figure 3 The image shows a transmission electron microscope (STEM) image of the Pd(OH)2 / C catalyst prepared using the carbon material prepared in Example 2 as a support.

[0033] Figure 4 The following are powder Raman spectra of the carbon materials prepared in Examples 1-2: (a) is carbon material #1, and (b) is carbon material #2.

[0034] Figure 5 The first carbon material (1#) and the second carbon material (2#) prepared in Examples 1-2 are hydrogen absorption curves of the Pd(OH)2 / C catalyst prepared on the support in the TADB hydrodebenzyl reaction. Detailed Implementation

[0035] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0036] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0037] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0038] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be obvious to those skilled in the art. This application specification and embodiments are merely exemplary.

[0039] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0040] Unless otherwise specified, "room temperature" and "normal temperature" in this invention refer to 25±2℃.

[0041] All raw materials used in the following embodiments of the present invention are commercially available.

[0042] This invention provides a method for preparing nitrogen-phosphorus co-doped carbon materials, comprising the following steps:

[0043] 1) The carbon precursor and water were mixed and subjected to a hydrothermal reaction to obtain a brown powder solid;

[0044] 2) Brown powder solid, nitrogen source and phosphorus source are ball-milled and mixed, and then calcined in an inert gas to obtain nitrogen and phosphorus co-doped carbon material.

[0045] In this invention, the ball milling is performed by adding milling beads to a mixture of brown powder solid, nitrogen source, and phosphorus source.

[0046] The mass ratio of the grinding balls to the mixture is 10:1 to 50:1, preferably 15:1 to 45:1, more preferably 20:1 to 40:1, and even more preferably 25:1 to 30:1;

[0047] The ball milling speed is 250 r / min to 400 r / min, preferably 280 r / min to 380 r / min, and more preferably 300 r / min to 350 r / min; the ball milling time is 10 min to 60 min, preferably 20 min to 50 min, and more preferably 30 min to 40 min.

[0048] In this invention, low rotation speed, short time, and low ball-to-powder ratio during ball milling lead to uneven doping of nitrogen and phosphorus sources. Conversely, high rotation speed and long milling times result in localized high temperatures in the milling jar, causing the loss of some low-melting-point, volatile samples. Furthermore, it alters the particle size of the carbon material after calcination, affecting its specific surface area and pore structure distribution. This invention optimizes the doping effect of heteroatoms by adjusting the ball milling process parameters, selecting appropriate rotation speed, time, and ball-to-powder ratio, thereby improving the efficiency of carbon material preparation.

[0049] In this invention, the concentration of the carbon precursor in water is 0.1 mol / L to 4.0 mol / L, preferably 0.2 mol / L to 3.0 mol / L, more preferably 0.5 mol / L to 2.5 mol / L, and even more preferably 1.2 mol / L to 2 mol / L.

[0050] In this invention, the temperature of the hydrothermal reaction is 170℃~200℃, preferably 175℃~190℃, more preferably 180℃~185℃, and the time is 20h~24h, preferably 21h~23h, more preferably 22h~22.5h.

[0051] In this invention, the mass ratio of the carbon precursor to the nitrogen source is 15:1 to 1:3, preferably 10:1 to 3:1, and more preferably 5:1 to 1:1; the mass ratio of the carbon precursor to the phosphorus source is 15:1 to 1:3, preferably 10:1 to 3:1, and more preferably 5:1 to 1:1.

[0052] In this invention, the carbon precursor comprises one or more of glucose, fructose, sucrose, starch, lignin, chitosan, sodium gluconate, and cellulose, preferably one or more of glucose, fructose, and sucrose, and more preferably glucose.

[0053] In this invention, the nitrogen source is a nitrogen-containing compound, which includes one or more of urea, dicyandiamide, melamine, hexamethylenetetramine, lysine, and ammonium salts, preferably one or more of urea, dicyandiamide, lysine, and melamine, and more preferably urea.

[0054] The phosphorus source is a phosphorus-containing compound, which includes one or more of phytate, phosphate, triphenylphosphine and hydrogen phosphate, preferably one or more of phytate, phosphate and hydrogen phosphate, and more preferably phytate.

[0055] In this invention, the heating rate of the calcination is 1℃ / min to 10℃ / min, preferably 5℃ / min to 10℃ / min, more preferably 7℃ / min to 10℃ / min, even more preferably 9℃ / min to 10℃ / min, the temperature is 600℃ to 1400℃, preferably 500℃ to 1200℃, more preferably 700℃ to 1000℃, even more preferably 800℃ to 900℃, and the time is 1h to 5h, preferably 2h to 4h, even more preferably 2.5h to 3h; the inert gas includes one or more of nitrogen, helium, and argon, preferably one or more of nitrogen and helium, and even more preferably nitrogen.

[0056] In this invention, the product obtained by calcination needs to be placed in hydrochloric acid solution, stirred and dissolved to remove impurities, filtered, washed and dried to obtain nitrogen and phosphorus co-doped carbon material.

[0057] The mass concentration of the hydrochloric acid solution is 10% to 50%, preferably 10% to 40%, more preferably 15% to 37%, and even more preferably 20% to 30%.

[0058] The stirring time is 4h to 10h, preferably 5h to 8h, and more preferably 6h to 7h;

[0059] The drying temperature is 60℃~120℃, more preferably 70℃~100℃, and even more preferably 80℃~90℃.

[0060] The present invention also provides a method for preparing nitrogen-phosphorus co-doped carbon materials as described above, resulting in nitrogen-phosphorus co-doped carbon materials.

[0061] This invention also provides the application of the above-mentioned nitrogen-phosphorus co-doped carbon material in the preparation of hydrogen debenzyl noble metal-based catalysts.

[0062] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0063] Example 1

[0064] 3.6 g of glucose was dissolved in 100 mL of deionized water. Under magnetic stirring, the glucose was completely dissolved. The homogeneous solution was transferred to a polytetrafluoroethylene liner and placed in a stainless steel autoclave. The autoclave was then hydrothermally heated at 170 °C for 24 h. The resulting brown solid was filtered and dried at 80 °C for 12 h. A certain mass of the brown solid was weighed and urea was added at a carbon precursor to nitrogen source ratio of 12:1. Phytate was added at a carbon precursor to phosphorus source ratio of 6:1. A ball milling ball:solid mixture was added at a ratio of 30:1. The mixture was ball milled at 300 r / min for 40 min. The brown solid obtained by mechanical ball milling was placed in a tube furnace and calcined at 700 °C for 2 h under a nitrogen atmosphere at a rate of 9 °C / min. After cooling to room temperature, the solid was mixed with 20 wt% hydrochloric acid and stirred for 6 h to remove impurity ions. The solid was washed with deionized water and dried to obtain carbon material #1.

[0065] Figure 1 (a) is the SEM image of carbon material #1. As can be seen from the image, the original morphology of the material after ball milling and calcination is basically unchanged.

[0066] Figure 2 The image shows a STEM image of the Pd(OH)2 / C catalyst prepared using carbon material as a support in Example 1#. As can be seen from the image, N and P are uniformly distributed on the surface of the spheres, and there is no agglomeration of metal particles.

[0067] Figure 4 (a) is the powder Raman spectrum of carbon material #1. As can be seen from the figure, after nitrogen and phosphorus are doped into the carbon material, more surface defects exist in its carbon framework, leading to an increase in the disorder of the carbon matrix.

[0068] Example 2

[0069] 7.2g of glucose was dissolved in 100mL of deionized water. Under magnetic stirring, the glucose was completely dissolved. The homogeneous solution was transferred to a polytetrafluoroethylene liner and placed in a stainless steel autoclave. The autoclave was then hydrothermally heated at 170℃ for 24h. The resulting brown solid was filtered and dried at 80℃ for 12h. A certain mass of the brown solid was weighed and urea was added at a carbon precursor to nitrogen source ratio of 12:1. Phytate was added at a carbon precursor to phosphorus source ratio of 3:1. A ball milling ball to solid mixture was added at a ratio of 30:1. The mixture was ball milled at 310r / min for 40min. The brown solid obtained by mechanical ball milling was placed in a tube furnace and calcined at 700℃ for 2h under a helium atmosphere at a rate of 10℃ / min. After cooling to room temperature, the solid was mixed with 20wt% hydrochloric acid and stirred for 6h to remove impurity ions. The solid was washed with deionized water and dried to obtain carbon material #2.

[0070] Figure 1 (b) is the SEM image of carbon material #1. As can be seen from the image, after changing the doping ratio and calcining the material after ball milling, the original morphology is basically unchanged.

[0071] Figure 3 The image shows a transmission STEM image of the Pd(OH)2 / C catalyst prepared using carbon material as a support in Example 2#. As can be seen from the image, N and P are uniformly distributed on the surface of the spheres, and there is no agglomeration of metal particles.

[0072] Figure 4 (b) is the powder Raman spectrum of carbon material #1. As can be seen from the figure, after nitrogen and phosphorus are doped into the carbon material, there are more surface defects in its carbon skeleton, which leads to an increase in the disorder of the carbon matrix.

[0073] Example 3

[0074] 14.4 g of glucose was dissolved in 100 mL of deionized water. Under magnetic stirring, the glucose was completely dissolved. The homogeneous solution was transferred to a polytetrafluoroethylene liner and placed in a stainless steel autoclave. The autoclave was then hydrothermally heated at 180 °C for 24 h. The resulting brown solid was filtered and dried at 80 °C for 12 h. A certain mass of the brown solid was weighed and urea was added at a carbon precursor to nitrogen source ratio of 7:1. Phytate was added at a carbon precursor to phosphorus source ratio of 6:1. A ball milling ball to solid mixture was added at a ratio of 30:1. The mixture was ball milled at 300 r / min for 40 min. The brown solid obtained by mechanical ball milling was placed in a tube furnace and calcined at 800 °C for 2 h under a nitrogen atmosphere at a rate of 10 °C / min. After cooling to room temperature, the mixture was stirred with 20 wt% hydrochloric acid for 7 h to remove impurity ions. The mixture was then washed with deionized water and dried to obtain carbon material #3.

[0075] Figure 1(c) is the SEM image of carbon material #1. As can be seen from the image, after changing the doping ratio and calcining the material by ball milling, the original morphology is basically unchanged.

[0076] Example 4

[0077] 21.6 g of glucose was dissolved in 100 mL of deionized water. Under magnetic stirring, the glucose was completely dissolved. The homogeneous solution was transferred to a polytetrafluoroethylene liner and placed in a stainless steel autoclave. The autoclave was then hydrothermally heated at 180 °C for 24 h. The resulting brown solid was filtered and dried at 80 °C for 12 h. A certain mass of the brown solid was weighed and urea was added at a carbon precursor to nitrogen source ratio of 7:1. Phytate was added at a carbon precursor to phosphorus source ratio of 3:1. A ball milling ball to solid mixture was added at a ratio of 30:1. The mixture was ball milled at 310 r / min for 40 min. The brown solid obtained by mechanical ball milling was placed in a tube furnace and calcined at 800 °C for 2 h at a rate of 10 °C / min under a nitrogen atmosphere. After cooling to room temperature, the mixture was stirred with 20 wt% hydrochloric acid for 6 h to remove impurity ions. The mixture was then washed with deionized water and dried to obtain carbon material #4.

[0078] Figure 1 (d) is the SEM image of carbon material #1. As can be seen from the image, after changing the doping ratio and calcining the material by ball milling, the original morphology is basically unchanged.

[0079] Comparative Example 1

[0080] The only difference from Example 1 is that no nitrogen or phosphorus source was added during mechanical ball milling, and the carbon carrier C* was obtained after calcination.

[0081] The specific surface area and pore size analysis of the carbon materials in Comparative Example C*, Example 1-1#, and Example 2-2# are shown in Table 1 below:

[0082] Table 1. BET specific surface area data of carbon materials prepared in Comparative Example 1 and Examples 1-2

[0083]

[0084] Table 1 shows that appropriate ball milling speed, time, and ball-to-powder ratio can effectively improve the doping of nitrogen and phosphorus atoms, while introducing an appropriate number of defect sites.

[0085] Application Example: Using the nitrogen-phosphorus co-doped carbon materials 1-1# and 2-2# obtained in Examples 1 and 2 as supports, corresponding Pd(OH)2 / C catalysts (Pd(OH)2 / C-1-1# and Pd(OH)2 / C-2-2#) were prepared by deposition precipitation method. The catalytic activity was evaluated using the hydrodebenzylation reaction of HBIW and TADB as probes. The reaction conditions were as follows: HBIW 25g, catalyst 0.5g, DMF 50ml, A2CO 25ml, PhBr 0.5ml; TADB 20g, catalyst 0.66g, CH3COOH 80ml, H2O 20ml, perchloric acid 0.5ml. Hydrogen was purged three times, and the reaction was stirred at 43℃ for 12h. The hydrogen absorption curves of the two catalyst samples in the TADB hydrodebenzylation reaction are attached. Figure 5 The activities of Pd(OH)2 / C*, Pd(OH)2 / C-1-1#, and Pd(OH)2 / C-2-2# in the hydrogenolysis reactions of HBIW and TADB are shown in Table 2.

[0086] Table 2. Activity of Pd(OH)2 / C*, Pd(OH)2 / C-1-1#, and Pd(OH)2 / C-2-2# in the hydrogenolysis reactions of HBIW and TADB.

[0087]

[0088] Pd(OH)2 / C* represents the catalyst prepared using the carbon material prepared in Comparative Example 1 as a support.

[0089] Depend on Figure 5 It is known that preparing catalysts by loading noble metals onto nitrogen and phosphorus doped materials can effectively improve the hydrogen evolution rate in the TADB hydrogen debenzylation reaction process.

[0090] Table 2 shows that catalysts prepared by loading noble metals onto nitrogen-phosphorus-doped carbon materials can effectively improve the conversion rate of TADB.

[0091] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a nitrogen-phosphorus co-doped carbon material, characterized in that, Includes the following steps: 1) The carbon precursor and water were mixed and subjected to a hydrothermal reaction to obtain a brown powder solid; 2) Brown powder solid, nitrogen source and phosphorus source are ball-milled and mixed, and then calcined in an inert atmosphere to obtain nitrogen and phosphorus co-doped carbon material; The ball milling process involves adding milling beads to a mixture of brown powder solid, nitrogen source, and phosphorus source for ball milling. The mass ratio of the grinding beads to the mixture is 10:1 to 50:1; The ball milling speed is 250 r / min to 400 r / min; the ball milling time is 10 min to 60 min; The inert atmosphere comprises one or more of nitrogen, helium, and argon.

2. The method for preparing nitrogen-phosphorus co-doped carbon material according to claim 1, characterized in that, The concentration of the carbon precursor in water is 0.1 mol / L to 4.0 mol / L.

3. The method for preparing nitrogen-phosphorus co-doped carbon material according to claim 1, characterized in that, The hydrothermal reaction is carried out at a temperature of 170℃ to 200℃ for a duration of 20h to 24h.

4. The method for preparing nitrogen-phosphorus co-doped carbon material according to claim 1 or 2, characterized in that, The mass ratio of the carbon precursor to the nitrogen source is 15:1 to 1:3; the mass ratio of the carbon precursor to the phosphorus source is 15:1 to 1:

3.

5. The method for preparing nitrogen-phosphorus co-doped carbon material according to claim 4, characterized in that, The carbon precursor comprises one or more of glucose, fructose, sucrose, starch, lignin, chitosan, sodium gluconate, and cellulose.

6. The method for preparing nitrogen-phosphorus co-doped carbon material according to claim 1, characterized in that, The nitrogen source is a nitrogen-containing compound, which includes one or more of urea, dicyandiamide, melamine, hexamethylenetetramine, lysine, and ammonium salts. The phosphorus source is a phosphorus-containing compound, which includes one or more of phytates, phosphates, and triphenylphosphine.

7. The method for preparing nitrogen-phosphorus co-doped carbon material according to claim 1, characterized in that, The calcination heating rate is 1℃ / min to 10℃ / min, the temperature is 600℃ to 1400℃, and the time is 1h to 5h.

8. The nitrogen-phosphorus co-doped carbon material prepared by the method according to any one of claims 1 to 7.

9. The application of the nitrogen-phosphorus co-doped carbon material according to claim 8 in the preparation of hydrogen debenzyl noble metal-based catalysts.

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