Preparation method and product of fe2n / fe co catalyst and application thereof

Abstract

The application discloses a preparation method and product of a Fe2N / FeCo catalyst and application of the product, and relates to a high-efficiency ammonia decomposition catalyst prepared by a hydrothermal method and a coprecipitation method; wherein the hydrothermal reaction temperature is 110 DEG C, the reaction time is 20 hours, and the coprecipitation method is under the condition that the catalyst is placed for 24 hours at room temperature. The catalyst synthesis process is simple and convenient to repeat; the catalyst particles prepared are easy to control and not prone to agglomeration, the ammonia decomposition performance of the catalyst is improved, and the reaction temperature of complete ammonia decomposition is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of ammonia decomposition, and particularly relates to a preparation method of Fe2N / FeCo catalyst, and a product and application thereof. BACKGROUND

[0002] With the continuous progress of modern society and industrial development, the demand for energy by mankind is increasing. Environmental pollution caused by the burning of fossil energy urgently requires mankind to develop clean and efficient new energy. Hydrogen energy, as a secondary energy, has the advantages of being clean and environmentally friendly, and its development is highly valued. Hydrogen energy will replace traditional energy due to its unique properties. Hydrogen can be directly burned to provide energy, and no CO x and NO x pollutants are discharged during use, so it is very clean and environmentally friendly and is considered to be the most promising clean energy in the 21st century.

[0003] Currently, the commonly used methods for hydrogen production in industry include methanol steam reforming, water electrolysis, coal gasification, natural gas or cracked petroleum gas, and ammonia decomposition. Among them, ammonia decomposition for hydrogen production has the advantages of simple process, high purity of hydrogen produced, low investment, and low cost, and has attracted widespread attention and research. Ammonia is a very promising hydrogen carrier. Ammonia has the advantages of high volumetric hydrogen density, high energy density, and easy transportation and storage, and the process of producing hydrogen by ammonia decomposition is pollution-free, so it is an excellent chemical hydrogen storage material. Ammonia is a hydrogen-rich fuel, and the volumetric hydrogen density of liquid ammonia is more than 1.5 times that of liquid hydrogen, which has the highest volumetric hydrogen density compared with other hydrogen storage materials. Ammonia is easy to compress and liquefy (pressurized to 1 MPa at room temperature or cooled to -33℃ at atmospheric pressure), which can solve the problem of hydrogen storage. Ammonia combustion produces only water and nitrogen, and no greenhouse gases are produced, which is clean and pollution-free. Therefore, hydrogen production by ammonia decomposition has great prospects.

[0004] However, the catalyst still faces great challenges in catalyzing complete decomposition of ammonia at low temperature. Therefore, there is an urgent need in the art for a new catalyst with high activity and high temperature stability. SUMMARY

[0005] This section is intended to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, the abstract and the title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0006] In view of the above and / or problems existing in the prior art, the present application is proposed.

[0007] Therefore, the present application aims at overcoming the deficiencies in the prior art and providing a preparation method of Fe2N / FeCo catalyst.

[0008] To solve the above technical problems, the present application provides a preparation method of Fe2N / FeCo catalyst, which comprises,

[0009] The metal salt is dissolved in the organic mixed solvent, the organic ligand is added, and stirring is performed until a mixed solution is formed;

[0010] The mixed solution is subjected to hydrothermal reaction, and the obtained precipitate is centrifuged, washed with anhydrous ethanol, dried, and ground to obtain Fe-MIL-101 powder;

[0011] The metal salt is dissolved in the organic mixed solvent, the organic ligand is added, and stirring is performed until a mixed solution is formed;

[0012] The mixed solution is subjected to co-precipitation, and the obtained precipitate is centrifuged, washed with anhydrous ethanol, dried, and ground to obtain Co-ZIF-67 powder;

[0013] The Fe-MIL-101 powder and the Co-ZIF-67 powder in different mass ratios are dissolved in anhydrous ethanol, melamine is added, stirring is performed until a mixed solution is formed, and drying treatment is performed.

[0014] The product is placed in a tube furnace, and calcination is performed under N2 atmosphere to obtain a high-performance ammonia decomposition hydrogen production catalyst Fe2N / FeCo-x:y-600;

[0015] The metal salt comprises iron nitrate and cobalt nitrate, the organic ligand comprises isophthalic acid and 2-methyl imidazole, and the organic mixed solvent is N,N-dimethylformamide and methanol;

[0016] The molar ratio of iron nitrate, isophthalic acid and N,N-dimethylformamide is 2:1:800, the molar ratio of cobalt nitrate, 2-methyl imidazole and methanol is 1:4:800, and the mass ratio of Fe-MIL-101 powder to Co-ZIF-67 powder is 0.15-0.9g:0.3g.

[0017] As a preferred scheme of the preparation method, the synthesis method of the Fe-MIL-101 comprises,

[0018] 0.42g of isophthalic acid and 2.05g of Fe(NO3)3·9H2O solid are placed in a 100ml capacity beaker, 50ml of N,N-dimethylformamide is added and stirring is performed until uniform, and then the mixture is transferred into a 100ml reaction kettle for hydrothermal reaction at 110℃ for 20h;

[0019] The suspension in the reaction kettle is moved into a beaker, centrifuged, the mother liquor is decanted, and the product is washed with anhydrous ethanol three times;

[0020] The washed sample is dried at 150℃ for 12h to obtain Fe-MIL-101 powder.

[0021] As a preferred solution of the preparation method, wherein: the synthesis method of Co-ZIF-67 comprises,

[0022] 1.96g of Co(NO3)2·6H2O is dissolved in 40ml of methanol to form solution A;

[0023] 2.23g of 2-methylimidazole is dissolved in another 40ml of methanol to form solution B;

[0024] Solution B is slowly added to solution A, stirred at room temperature for 1h, aged for 24h, centrifuged, the mother liquor is decanted, and the product is washed with anhydrous ethanol three times;

[0025] The washed sample is dried at 60℃ for 12h to obtain Co-ZIF-67 powder.

[0026] As a preferred solution of the preparation method, wherein: the synthesis method of Fe2N / FeCo-x:y-600 comprises,

[0027] Different mass ratios of Fe-MIL-101 and Co-ZIF-67 powders are placed in a beaker, and the same mass of melamine as Fe-MIL-101 and Co-ZIF-67 and 20mL of anhydrous ethanol are added and stirred at room temperature for 3h;

[0028] The above beaker is placed in an oven for drying treatment at 60℃ for 12h;

[0029] The product is placed in a tube furnace and calcined at 600℃ under N2 atmosphere for 3h, and the obtained sample after natural cooling is named Fe2N / FeCo-x:y-600.

[0030] As a preferred solution of the preparation method, wherein: the hydrothermal reaction of Fe-MIL-101, wherein the reaction temperature is 110℃ and the reaction time is 20h.

[0031] As a preferred solution of the preparation method, wherein: the coprecipitation method of Co-ZIF-67, wherein the reaction temperature is room temperature and the aging time is 24h.

[0032] As a preferred scheme of the preparation method of the application, wherein: the mass ratio of the Fe-MIL-101 and Co-ZIF-67 is 0.15-0.9 g: 0.3 g.

[0033] As a preferred scheme of the preparation method of the ammonia decomposition catalyst of the application, wherein: the calcination condition, wherein the calcination temperature is 600 DEG C, and the calcination time is 3 h.

[0034] As a preferred scheme of the preparation method of the ammonia decomposition catalyst of the application, wherein: the drying, all are vacuum drying.

[0035] Still another object of the application is to overcome the deficiencies in the prior art and provide a product prepared by the preparation method of the Fe-MIL-101 and Co-ZIF-67 mutual regulation catalyst.

[0036] Another object of the application is to overcome the deficiencies in the prior art and provide the application of the product prepared by the preparation method of the Fe-MIL-101 and Co-ZIF-67 mutual regulation catalyst as a high-efficiency ammonia decomposition catalyst.

[0037] The application has the following beneficial effects:

[0038] The application provides a preparation method of a Fe-MIL-101 and Co-ZIF-67 mutual regulation catalyst, which has a simple synthesis process and is easy to repeat; the prepared catalyst particles are easy to control and not easy to agglomerate, thereby improving the ammonia decomposition performance of the catalyst and reducing the reaction temperature of the complete decomposition of ammonia. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor. Among them:

[0040] Figure 1 It is the Fe2N / FeCo-x:y-600 catalyst ammonia decomposition performance chart in the embodiment 1-4 of the application.

[0041] Figure 2 It is the XRD chart of the synthesized Fe2N / FeCo-x:y-600 catalyst in the embodiment 1-5 of the application.

[0042] Figure 3 It is the SEM chart of the synthesized Fe2N / FeCo-1:1-600 catalyst in the embodiment 3 of the application.

[0043] Figure 4 HRTEM image of the synthesized Fe2N / FeCo-1:1-600 catalyst in Example 3 of the present application. DETAILED DESCRIPTION

[0044] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference made to the embodiments of the present application.

[0045] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may, however, be practiced in a variety of ways beyond the specific embodiments described herein without departing from the scope of the present application. It can be appreciated that implementations of the present application can be used in a variety of different mechanical, electrical, and computer-based contexts.

[0046] Second, the "one embodiment" or "an embodiment" as used herein means that a particular implementation can include a particular feature, structure, or characteristic, but every embodiment can not necessarily include the particular feature, structure, or characteristic. Furthermore, the appearances of "in one embodiment" or "in an embodiment" at different places in specifications do not necessarily refer to the same embodiment.

[0047] Ammonia decomposition reaction performance evaluation: The test was performed using a fixed bed reactor (inner diameter 4 mm quartz tube), ammonia space velocity was 30000 ml·g cat -1 ·h -1 , the reaction temperature was 300℃-800℃, the step was 50℃;

[0048] 0.1 g of catalyst was placed in the quartz tube, the NH3 flow was 50 ml / min, the gas flow was controlled by a mass flow meter; the reaction heating rate was 5℃ / min, each reaction temperature was stable for 30 min for measurement, the tail gas after reaction was analyzed for products using gas chromatography, a thermal conductivity detector was used, the detector temperature was 150℃, H2 was used as the carrier gas, a special column for amine analysis from Shanghai Onyi was used as the chromatographic column, the column temperature was 110℃, and the carrier gas flow rate was 40 ml / min.

[0049] The ammonia decomposition conversion rate of the present application was calculated according to the following formula:

[0050]

[0051] wherein, is the NH3 conversion rate, is the total amount of ammonia in the feed gas, is the unconverted amount of ammonia.

[0052] Example 1

[0053] (1) Preparation of Fe2N / FeCo-1:2-600 catalyst for high-temperature thermal catalytic ammonia decomposition:

[0054] 0.42 g of isophthalic acid and 2.05 g of Fe(NO3)3·9H2O solid were weighed into a 100 ml capacity beaker, 50 ml of N,N-dimethylformamide was added and stirred until uniform, and then transferred into a 100 ml reaction kettle for hydrothermal reaction at 110°C for 20 h. The suspension in the reaction kettle was transferred into a beaker, centrifuged, and the mother liquor was decanted. The product was washed with anhydrous ethanol three times, and the washed sample was dried at 150°C for 12 h to obtain Fe-MIL-101 powder.

[0055] 1.96 g of Co(NO3)2·6H2O was dissolved in 40 ml of methanol to form solution A; 2.23 g of 2-methylimidazole was dissolved in another 40 ml of methanol to form solution B. Solution B was slowly added to solution A, stirred at room temperature for 1 h, aged for 24 h, centrifuged, and the mother liquor was decanted. The product was washed with anhydrous ethanol three times, and the washed sample was dried at 60°C for 12 h to obtain Co-ZIF-67 powder.

[0056] 0.15 g of Fe-MIL-101, 0.3 g of Co-ZIF-67, and 0.45 g of melamine were placed in a 50 mL beaker. 20 mL of anhydrous ethanol was added to the beaker and stirred at room temperature for 3 h. The above beaker was placed in an oven for drying treatment at 60°C for 12 h. Then the product was placed in a tube furnace and calcined at 600°C for 3 h under N2 atmosphere, and the Fe2N / FeCo-1:2-600 catalyst was obtained after natural cooling.

[0057] (2) Ammonia decomposition conversion rate determination

[0058] The ammonia decomposition performance test evaluation of the series of catalysts showed that the NH3 conversion rate reached 76.6% at 550°C when Fe3C / Fe-800 was used for ammonia decomposition. Figure 1 After XRD determination of Fe2N / FeCo-1:2-600 (see Figure 2 ), the Fe2N (PDF: 01-072-2126) and FeCo (PDF: 97-015-5839) diffraction peaks were obvious, indicating that the crystallinity was very high.

[0059] Example 2

[0060] (1) Preparation of Fe2N / FeCo-1:2-600 catalyst for high-temperature thermal catalytic ammonia decomposition:

[0061] The same synthesis method as in Example 1 was used, the amount of Fe-MIL-101 introduced was 0.3 g, the amount of Co-ZIF-67 introduced was 0.3 g, the amount of melamine introduced was 0.6 g, and the rest was unchanged. The final product was named Fe2N / FeCo-1:1-600.

[0062] (2) Ammonia decomposition conversion rate determination

[0063] Through the ammonia decomposition performance test evaluation of the series of catalysts, see Figure 1 , the results show that when Fe2N / FeCo-1:1-600 is used to catalyze ammonia decomposition, the NH3conversion rate reaches 93.8% at 550°C. After XRD determination of Fe2N / FeCo-1:1-600 (see Figure 2 ), the Fe2N (PDF: 01-072-2126) and FeCo (PDF: 97-015-5839) diffraction peaks are obvious, indicating that the crystallinity is very high. SEM characterization of Fe2N / FeCo-1:1-600 (see Figure 3 ) shows that Fe2N and FeCo nanoparticles are uniformly dispersed on the surface of the catalyst. HRTEM characterization of Fe3C / Fe-2:1-800 (see Figure 4 ) shows that the crystal lattice fringes of Fe2N and FeCo are obvious.

[0064] Example 3

[0065] (1) Preparation of high-temperature thermal catalytic ammonia decomposition Fe2N / FeCo-2:1-600 catalyst:

[0066] The same synthesis method as in Example 1 was used, the amount of Fe-MIL-101 introduced was 0.6 g, the amount of Co-ZIF-67 introduced was 0.3 g, the amount of melamine introduced was 0.9 g, and the rest was unchanged. The final product was named Fe2N / FeCo-2:1-600.

[0067] (2) Ammonia decomposition conversion rate determination

[0068] Through the ammonia decomposition performance test evaluation of the series of catalysts, see Figure 1 , the results show that when Fe3C / Fe-2:1-800 is used to catalyze ammonia decomposition, the NH3conversion rate reaches 88.0% at 550°C. After XRD determination of Fe3C / Fe-2:1-800 (see Figure 2 ), the Fe2N (PDF: 01-072-2126) and FeCo (PDF: 97-015-5839) diffraction peaks are obvious, indicating that the crystallinity is very high.

[0069] Example 4

[0070] (1) Preparation of high-temperature thermal catalytic ammonia decomposition Fe2N / FeCo-3:1-600 catalyst:

[0071] The same synthesis method was used as in Example 1, the Fe-MIL-101 was introduced in an amount of 0.9 g, the Co-ZIF-67 was introduced in an amount of 0.3 g, and the melamine was introduced in an amount of 1.2 g, and the other conditions were unchanged, and the final product was named Fe2N / FeCo-3:1-600.

[0072] (2) Ammonia decomposition conversion rate determination

[0073] The ammonia decomposition performance of the series of catalysts was tested and evaluated, and the results are shown in Figure 1 , and the results show that when the Fe3C / Fe-1:2-800 catalyst is used for ammonia decomposition, the NH3 conversion rate reaches 68.5% at 550°C.

[0074] The ammonia decomposition hydrogen production performance of the Fe3C / Fe-800 and Fe3C / Fe-x:y-800 samples prepared in Examples 1-5 of the present application is shown in Figure 1 , and the mass ratio of Fe-MIL-101 to Co-ZIF-67 is preferably 1:1, which achieves the best ammonia catalytic effect.

[0075] The XRD pattern of Fe2N / FeCo-x:y-600 prepared in Examples 1-4 of the present application is shown in Figure 2 , the SEM pattern of Fe2N / FeCo-1:1-600 prepared in Example 2 is shown in Figure 3 , and the HRTEM pattern of Fe2N / FeCo-2:1-600 prepared in Example 2 is shown in Figure 4 .

[0076] The inventors further found that for transition metals Fe and Co, the Fe3C / Fe-1:1-800 catalyst prepared by the hydrothermal method and the coprecipitation method can better perform ammonia decomposition to produce hydrogen, and the conversion rate is further improved. The reason is that the active metals are uniformly dispersed on the surface of the catalyst, which expands the contact area with NH3, and better exposes the active sites, thereby improving the conversion rate of ammonia decomposition. The high-efficiency ammonia decomposition catalyst of the present application has high catalytic activity, and the conversion rate at 550°C reaches 93.8%. The present application prepares a high-efficiency low-temperature ammonia decomposition catalyst by the hydrothermal method and the coprecipitation method, and the catalyst synthesis process is simple and easy to repeat. The prepared catalyst particles are easy to control and not easy to agglomerate, which improves the ammonia decomposition performance of the catalyst and reduces the reaction temperature of complete ammonia decomposition.

[0077] Comparative Example 1

[0078] (1) Preparation of high-temperature thermal catalytic ammonia decomposition Fe-600 catalyst:

[0079] Take 0.42 g of isophthalic acid and 2.05 g of Fe(NO3)3·9H2O solid, put into a 100 ml capacity beaker, add 50 ml of N,N-dimethylformamide and stir evenly, move into a 100 ml reactor for hydrothermal reaction, 110℃ reaction for 20 h. Move the suspension in the reactor into a beaker, centrifuge, decant the mother liquor, wash the product with anhydrous ethanol three times, dry the washed sample at 150℃ for 12 h to obtain Fe-MIL-101 powder. Put 0.3 g of Fe-MIL-101 and 0.3 g of melamine into a 50 mL beaker. Add 20 mL of anhydrous ethanol in the beaker and stir at room temperature for 3 h. Put the above beaker in an oven for drying treatment at 60℃ for 12 h. Then put the product in a tube furnace and calcine at 600℃ under N2 atmosphere for 3 h to obtain Fe-600 catalyst.

[0080] (2) Ammonia decomposition conversion rate determination

[0081] The performance of the catalyst was evaluated by ammonia decomposition performance test, and the NH3 conversion rate reached 53.4% at 550℃. Its performance is lower than that of Fe2N / FeCo-1:1-600, which is 93.8%.

[0082] Comparative Example 2

[0083] (1) Preparation of high-temperature thermal catalytic ammonia decomposition Co-600 catalyst:

[0084] Take 1.96 g of Co(NO3)2·6H2O and dissolve it in 40 ml of methanol to form solution A; take 2.23 g of 2-methylimidazole and dissolve it in another 40 ml of methanol to form solution B. Slowly add solution B to solution A, stir at room temperature for 1 h, age for 24 h, centrifuge, decant the mother liquor, wash the product with anhydrous ethanol three times, dry the washed sample at 60℃ for 12 h to obtain Co-ZIF-67 powder. Put 0.3 g of Co-ZIF-67 and 0.3 g of melamine into a 50 mL beaker. Add 20 mL of anhydrous ethanol in the beaker and stir at room temperature for 3 h. Put the above beaker in an oven for drying treatment at 60℃ for 12 h. Then put the product in a tube furnace and calcine at 600℃ under N2 atmosphere for 3 h to obtain Co-600 catalyst.

[0085] (2) Ammonia decomposition conversion rate determination

[0086] The performance of the catalyst was evaluated by ammonia decomposition performance test, and the NH3 conversion rate reached 79.0% at 550℃. Its performance is lower than that of Fe2N / FeCo-1:1-600, which is 93.8%.

[0087] Comparative Example 3

[0088] (1) Preparation of high-temperature thermal catalytic ammonia decomposition Fe2N / FeCo-1:1-500 catalyst:

[0089] 0.42 g of isophthalic acid and 2.05 g of Fe(NO3)3·9H2O solid were weighed into a 100 ml capacity beaker, 50 ml of N,N-dimethylformamide was added and stirred until uniform, and then transferred into a 100 ml reaction kettle for hydrothermal reaction at 110°C for 20 h. The suspension in the reaction kettle was transferred into a beaker, centrifuged, and the mother liquor was decanted. The product was washed with anhydrous ethanol three times, and the washed sample was dried at 150°C for 12 h to obtain Fe-MIL-101 powder.

[0090] 1.96 g of Co(NO3)2·6H2O was dissolved in 40 ml of methanol to form solution A; 2.23 g of 2-methylimidazole was dissolved in another 40 ml of methanol to form solution B. Solution B was slowly added to solution A, stirred at room temperature for 1 h, aged for 24 h, centrifuged, and the mother liquor was decanted. The product was washed with anhydrous ethanol three times, and the washed sample was dried at 60°C for 12 h to obtain Co-ZIF-67 powder.

[0091] 0.3 g of Fe-MIL-101, 0.3 g of Co-ZIF-67, and 0.6 g of melamine were placed in a 50 mL beaker. 20 mL of anhydrous ethanol was added to the beaker and stirred at room temperature for 3 h. The above beaker was placed in an oven for drying treatment at 60°C for 12 h. Then the product was placed in a tube furnace and calcined at 500°C for 3 h under N2 atmosphere, and the Fe2N / FeCo-1:1-500 catalyst was obtained after natural cooling.

[0092] (2) Ammonia decomposition conversion rate determination

[0093] The performance of the catalyst was evaluated by ammonia decomposition performance test, and the NH3 conversion rate reached 64.8% at 550°C. Its performance is lower than that of Fe2N / FeCo-1:1-600, which is 93.8%.

[0094] Comparative Example 4

[0095] (1) Preparation of high-temperature thermal catalytic ammonia decomposition Fe2N / FeCo-1:1-700 catalyst:

[0096] Take 0.42 g of isophthalic acid and 2.05 g of Fe(NO3)3·9H2O solid, put into a 100 ml capacity beaker, add 50 ml of N,N-dimethylformamide and stir evenly, move into a 100 ml reaction kettle for hydrothermal reaction, 110℃ reaction for 20 h. Move the suspension in the reaction kettle into a beaker, centrifuge, decant the mother liquor, wash the product with anhydrous ethanol three times, dry the washed sample at 150℃ for 12 h to obtain Fe-MIL-101 powder.

[0097] Take 1.96 g of Co(NO3)2·6H2O and dissolve it in 40 ml of methanol to form solution A; take 2.23 g of 2-methylimidazole and dissolve it in another 40 ml of methanol to form solution B. Slowly add solution B to solution A, stir at room temperature for 1 h, age for 24 h, centrifuge, decant the mother liquor, wash the product with anhydrous ethanol three times, dry the washed sample at 60℃ for 12 h to obtain Co-ZIF-67 powder.

[0098] Put 0.3 g of Fe-MIL-101, 0.3 g of Co-ZIF-67 and 0.6 g of melamine into a 50 mL beaker. Add 20 mL of anhydrous ethanol in the beaker and stir at room temperature for 3 h. Put the above beaker in an oven for drying treatment at 60℃ for 12 h. Then put the product in a tube furnace and calcine at 650℃ under N2 atmosphere for 3 h to obtain Fe2N / FeCo-1:1-700 catalyst after natural cooling.

[0099] (2) Ammonia decomposition conversion rate determination

[0100] Through ammonia decomposition performance test evaluation of the catalyst, the NH3 conversion rate reached 53.7% at 550℃. Its performance is lower than that of Fe2N / FeCo-1:1-600, which is 93.8%.

[0101] It should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. Use of a Fe2N / FeCo catalyst in hydrogen production by ammonia decomposition, characterized in that: The preparation method of the Fe2N / FeCo catalyst comprises, Fe-MIL-101 powder and Co-ZIF-67 powder are dissolved in anhydrous ethanol, melamine is added, stirring is uniformly performed, a mixed solution is formed, and drying treatment is performed; The product is placed in a tube furnace, and calcination is performed under an N2 atmosphere, so that a high-performance ammonia decomposition hydrogen production catalyst Fe2N / FeCo is obtained; The mass ratio of the Fe-MIL-101 powder to the Co-ZIF-67 powder is 0.15-0.9 g:0.3 g.

2. Use according to claim 1, characterized in that: The Fe-MIL-101 powder is synthesized by a method comprising, 0.42 g of isophthalic acid and 2.05 g of Fe(NO3)3·9H2O solid are placed in a 100-ml capacity beaker, 50 ml of N,N-dimethylformamide is added and stirring is uniformly performed, the mixture is transferred into a 100-ml reaction kettle, and hydrothermal reaction is performed at 110 DEG C for 20 h; The suspension in the reaction kettle is transferred into a beaker, centrifugation is performed, mother liquor is decanted, and the product is washed with anhydrous ethanol three times; The washed sample is dried at 150 DEG C for 12 h, so that Fe-MIL-101 powder is obtained.

3. The use according to claim 1, characterized in that: The Co-ZIF-67 powder is synthesized by a method comprising, 1.96 g of Co(NO3)2·6H2O is dissolved in 40 ml of methanol to form solution A; 2.23 g of 2-methylimidazole is dissolved in another 40 ml of methanol to form solution B; Solution B is slowly added to solution A, stirring is performed at room temperature for 1 h, aging is performed for 24 h, centrifugation is performed, mother liquor is decanted, and the product is washed with anhydrous ethanol three times; The washed sample is dried at 60 DEG C for 12 h, so that Co-ZIF-67 powder is obtained.

4. The use according to claim 1, characterized in that: The sum of the mass of the Fe-MIL-101 and the mass of the Co-ZIF-67 is the same as the mass of melamine.

5. The use according to claim 1, characterized in that: The calcination temperature is 600 DEG C, and the calcination time is 3 h.

6. The use according to claim 1, characterized in that: The drying is all vacuum drying.

Images