Preparation method of bifunctional heterogeneous noble metal catalyst and application of bifunctional heterogeneous noble metal catalyst in low-temperature rapid hydrogen release of slurry hydrogen storage material

Abstract

The application provides a preparation method of a bifunctional heterogeneous noble metal catalyst, in which an amphiphilic organic molecule with hydrophilic and oleophilic groups or structures is used as a modifier to modify zeolite to obtain modified zeolite; and then the modified zeolite is used as a carrier to load noble metal to prepare the bifunctional heterogeneous noble metal catalyst. The amphiphilic organic molecule grafted on the surface of the zeolite can improve the adsorption capacity of the zeolite to the organic phase and the aqueous phase, and the loaded noble metal active component enables the zeolite to have the bifunctional catalytic effect of promoting aluminum hydrolysis to produce hydrogen and improving the hydrogen release rate of the organic liquid, thereby significantly improving the overall efficiency of the hydrogen production system. The application not only effectively solves the problem of the hindering of the surface oxide film of aluminum in the hydrolysis process, but also realizes efficient heat and material transfer between water and the organic liquid hydrogen storage material, and meets the application requirement of low-temperature and rapid hydrogen release of the organic liquid hydrogen storage material in the aluminum-based slurry hydrogen storage material.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydrogen production materials, and particularly relates to a preparation method of a bifunctional heterogeneous noble metal catalyst, and also relates to application of the bifunctional heterogeneous noble metal catalyst in low-temperature rapid hydrogen release of slurry-state hydrogen storage and production materials. BACKGROUND

[0002] Hydrogen energy has advantages of high calorific value, recyclability, environmental protection and the like, and is one of new energy types with the most development prospects, however, how to realize efficient hydrogen storage and production becomes an important bottleneck restricting large-scale development of hydrogen energy.

[0003] Patent CN118598073A discloses an aluminum-based slurry-state hydrogen storage and production material and a preparation method thereof, the method is to coat nano-microcrystalline aluminum-based powder with an organic liquid hydrogen storage material, and the aluminum-based slurry-state hydrogen storage and production material has advantages of controllable reaction process and stable hydrogen production rate in the hydrogen production by hydrolysis, effectively solves the problem of poor continuity of traditional aluminum-based material in hydrogen production, and is a hydrogen production technology with extremely development prospects. However, the technology faces the following problems in actual application: firstly, a dense oxide film is easily formed on the surface of aluminum in the hydrolysis process, which hinders further occurrence of the aluminum hydrolysis reaction; secondly, the hydrogen release rate of the organic liquid hydrogen storage material is slow, heat production cannot be timely consumed, and the hydrogen production amount is limited; and thirdly, the hydrogen production by hydrolysis of the aluminum-based slurry-state hydrogen storage and production material faces problems of material and heat transfer between different phases, which has a significant influence on the rate of the overall hydrogen production by hydrolysis.

[0004] In order to solve the problem of the surface oxide film of the aluminum-based material, patent CN116022733B proposes to composite aluminum with zeolite material, and effectively remove the surface oxide film of aluminum by using the unique internal porous framework structure of the zeolite. However, the zeolite has almost no catalytic effect on the organic liquid hydrogen storage material, and direct combination with the traditional organic liquid hydrogen storage material hydrogen release catalyst will increase the complexity and cost of the hydrogen production system.

[0005] Therefore, development of a catalyst with excellent performance to synergistically improve the hydrogen production by hydrolysis and hydrogen release efficiency of the organic liquid hydrogen storage material is an urgent problem to be solved in the current technical field. SUMMARY

[0006] One of the purposes of the application is to provide a preparation method of a bifunctional heterogeneous noble metal catalyst capable of synergistically improving the hydrogen production by hydrolysis and hydrogen release efficiency of the organic liquid hydrogen storage material, and promoting low-temperature rapid hydrogen release of the organic liquid hydrogen storage material.

[0007] The second purpose of the application is to provide application of the bifunctional heterogeneous noble metal catalyst in low-temperature rapid hydrogen release of slurry-state hydrogen storage and production materials.

[0008] The technical scheme adopted by one of the purposes of the present application is to provide a preparation method of a bifunctional heterogeneous noble metal catalyst, comprising the following steps:

[0009] The modifier is dissolved in a solvent to obtain a modifier solution; the modifier is selected from amphiphilic organic molecules having hydrophilic and lipophilic groups or structures; the zeolite is added to the modifier solution to perform liquid phase chemical plating decoration to obtain modified zeolite; the modified zeolite is placed in a noble metal salt solution for impregnation treatment, and then placed in a reducing atmosphere for reduction treatment to obtain the bifunctional heterogeneous noble metal catalyst.

[0010] The general idea and invention principle of the present application are as follows:

[0011] The present application uses amphiphilic organic molecules having hydrophilic and lipophilic groups or structures to modify the zeolite to prepare a modified zeolite. The zeolite, with its unique porous framework structure, is an ideal choice for a catalyst carrier. The active components commonly used for organic liquid hydrogen storage material hydrogen release catalysts, such as noble metals such as palladium (Pd), platinum (Pt), and iridium (Ir), are combined with the modified zeolite material to provide a bifunctional catalyst for aluminum-based slurry hydrogen storage materials that has both catalytic aluminum hydrolysis hydrogen production and catalytic organic liquid hydrogen storage material hydrogen release. The internal porous framework structure of the zeolite can effectively remove the oxide film on the surface of aluminum, thereby promoting the aluminum hydrolysis hydrogen production process. This process is an exothermic reaction, and the heat released can provide thermal energy for the noble metal catalytic organic liquid hydrogen storage material hydrogen release, further improving the hydrogen release efficiency. The zeolite modified by the amphiphilic organic molecules exhibits excellent adsorption performance for both aqueous and organic phases, which is beneficial to the rapid transfer of heat from the aqueous phase to the organic phase, effectively solving the heat transfer problem between the organic liquid hydrogen storage material and water due to their immiscibility, and achieving efficient heat coupling.

[0012] Further, the modifier is selected from one or more combinations of octadecylamine ODA, trimethylchlorosilane TMS, and n-octadecyltrichlorosilane OTS. ODA, TMS, OTS, and other organic molecules are adsorbed on the acid sites on the surface of the zeolite, and this adsorption mainly occurs in the form of a chemical reaction, ensuring its stability on the surface of the zeolite. Since these molecules have lipophilic alkyl chains and hydrophilic amine groups, the modified zeolite has strong adsorption capacity for both aqueous and organic phases, significantly improving the catalyst's catalytic aluminum hydrolysis hydrogen production and organic liquid hydrogen storage material hydrogen release rate, and facilitating the rapid transfer of heat from the aqueous phase to the organic phase, achieving efficient heat coupling.

[0013] Further, the solvent includes one of ethanol, toluene, methanol, and ethylbenzene.

[0014] Further, the concentration of the modifier solution is 0.01-0.2 g / mL, and the mass-volume ratio of the zeolite to the modifier solution is 0.1-0.5 g / mL. Preferably, the mass ratio of the modifier to the zeolite is (1-10):20.

[0015] Further, the zeolite comprises a combination of one or more of H gamma zeolite, TS-1 zeolite, HZSM-5 zeolite, MCM-22 zeolite, mordenite.

[0016] Further, the liquid-phase chemical plating is performed under stirring, the stirring temperature is 20-50℃, and the stirring time is 2-4 h.

[0017] Further, the noble metal of the noble metal salt solution comprises a combination of one or more of Pd, Pt, and Ir; in the bifunctional heterogeneous noble metal catalyst, the loading of the noble metal is 0.5wt.%-3wt.%, preferably 1wt.%. The impregnation time of the modified zeolite in the noble metal salt solution is 3-5 h.

[0018] Further, the reduction treatment temperature is 350-550℃, and the time is 3-5 h. Preferably, the reduction atmosphere adopts a mixed gas composed of hydrogen and argon according to a volume ratio of 1:(5-20); the heating rate of the reduction treatment is 4-6℃ / min.

[0019] The second purpose of the present application is achieved by providing an application of the bifunctional heterogeneous noble metal catalyst prepared by the preparation method according to the first purpose of the present application in low-temperature rapid hydrogen release of slurry hydrogen storage materials. The bifunctional heterogeneous noble metal catalyst is mixed with aluminum powder under an inert atmosphere, and is subjected to ball milling treatment to obtain an activated aluminum hydrolysis hydrogen production material; and the activated aluminum hydrolysis hydrogen production material is mixed with an organic liquid hydrogen storage material, and is subjected to ball milling treatment to obtain an aluminum-based slurry hydrogen storage material.

[0020] Further, the mass ratio of the bifunctional heterogeneous noble metal catalyst to the aluminum powder is 1:4, the rotation speed of the ball milling treatment is 300-500 r / min, and the ball milling treatment time is 1-3 h; and the mass ratio of the activated aluminum hydrolysis hydrogen production material to the organic liquid hydrogen storage material is 1:(3-5).

[0021] Further, the organic liquid hydrogen storage material comprises a combination of one or more of perhydro-N-propylcarbazole (12H-NPCZ), perhydro-dibenzyltoluene (18H-DBT), perhydro-2-methylindole (8H-2-MID), and perhydro-N-ethylcarbazole (12H-NECZ).

[0022] Further, different kinds of noble metals are selected to prepare the bifunctional catalysts for different organic liquid hydrogen storage materials, so as to achieve better catalytic effect. It is found through research that the noble metals Pd and Ir have good catalytic effect on the hydrogen release of 12H-NPCZ and 8H-2-MID, and the noble metal Pt has good catalytic effect on the hydrogen release of 18H-DBT.

[0023] Further, in the aluminum-based slurry hydrogen storage material, the organic liquid hydrogen storage material has a hydrogen release conversion rate of 77.2%-87.8% under the action of the activated aluminum hydrolysis hydrogen generation material and under the condition that the environmental temperature is 70-100 ℃ for 20 min.

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

[0025] (1) The present application provides a preparation method of a bifunctional heterogeneous noble metal catalyst. An amphiphilic organic molecule with hydrophilic and lipophilic groups or structures is used as a modifier to modify zeolite, so as to obtain modified zeolite. Then, the modified zeolite is used as a carrier to load noble metal and prepare a bifunctional heterogeneous noble metal catalyst. The amphiphilic organic molecule grafted on the surface of the zeolite can improve the adsorption capacity of the zeolite to the organic phase and the aqueous phase. Then, the loaded noble metal active component (such as Pd, Pt, Ir, etc.) enables the zeolite to have the bifunctional catalytic effect of promoting aluminum hydrolysis hydrogen generation and improving the hydrogen release rate of the organic liquid, thereby significantly improving the overall efficiency of the hydrogen generation system.

[0026] (2) The bifunctional heterogeneous noble metal catalyst provided by the present application loads noble metal active components on the modified zeolite as a carrier. This catalyst is compounded with aluminum in subsequent applications, which not only effectively solves the problem of the surface oxide film of aluminum in the hydrolysis process, but also realizes efficient heat and mass transfer between water and the organic liquid hydrogen storage material. The present application simplifies the design of the hydrogen generation system, reduces the cost, and provides reliable technical support for the large-scale application of the aluminum-based slurry hydrogen storage material. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The application provides a comparison chart of the hydrogen generation amount of the catalysts prepared in the examples and the comparative examples in the application versus time. DETAILED DESCRIPTION

[0028] The technical solutions of the present application will be described in detail below with reference to the examples. Obviously, the described examples are only a part of the examples of the present application, rather than all the examples. Based on the examples in the present application, all other examples obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0030] The present application provides a preparation method of a bifunctional heterogeneous noble metal catalyst, comprising the following steps:

[0031] Step 1: dissolving a modifier in a solvent to obtain a modifier solution; the modifier is selected from one or more combinations of octadecylamine ODA, trimethylchlorosilane TMS, and n-octadecyltrichlorosilane OTS; the solvent is selected from ethanol or toluene; the concentration of the modifier solution is 0.01-0.2 g / mL.

[0032] Step 2: adding a zeolite into the modifier solution to perform liquid phase chemical plating decoration to obtain a modified zeolite; the zeolite includes one or more combinations of Hγ zeolite, TS-1 zeolite, HZSM-5 zeolite, MCM-22 zeolite, and mordenite. The mass-volume ratio of the zeolite to the modified solution is 0.1-0.5 g / mL; the mass ratio of the modifier to the zeolite is (1-10):20; the liquid phase chemical plating decoration is performed under stirring, the stirring temperature is 20-50℃, and the stirring time is 2-4 h.

[0033] Then the modified zeolite is placed in a noble metal salt solution for impregnation treatment, and then is placed in a reducing atmosphere for reduction treatment to obtain a bifunctional heterogeneous noble metal catalyst. The noble metal in the noble metal salt solution includes one or more combinations of Pd, Pt, and Ir; the loading amount of the noble metal in the bifunctional heterogeneous noble metal catalyst is 1 wt.%; the modified zeolite is impregnated in the noble metal salt solution for 3-5 h. The reduction treatment is performed at a temperature of 350-550℃ for 3-5 h; the reducing atmosphere is a mixed gas composed of hydrogen and argon according to a volume ratio of 1:(5-20); the heating rate of the reduction treatment is 4-6℃ / min.

[0034] The present application is further described below in combination with specific embodiments, but is not limited by the embodiments.

[0035] Embodiment 1

[0036] The present embodiment provides a preparation method of a bifunctional heterogeneous Pd-based catalyst for low-temperature rapid hydrogen release of slurry hydrogen storage materials, comprising the following steps:

[0037] Step 1: adding 0.5 g of octadecylamine (ODA) into 50 mL of ethanol to prepare a solution. Under the condition of a constant temperature water bath at 30℃, adding 10 g of Hγ zeolite into the above ODA solution, and fully stirring for 12 hours to realize liquid phase chemical plating decoration of the zeolite. Subsequently, fully drying the modified zeolite sample to obtain ODA-Hγ zeolite.

[0038] Step 2: Weigh 0.1065 g of palladium acetate, and dissolve it in 15 mL of acetone. Add 4.95 g of the ODA-Hy zeolite described above to the solution, and immerse it for 4 h. After drying, the sample is reduced in a 10% H2 / Ar atmosphere at 5°C / min to 450°C for 4 h to obtain a Pd / ODA-Hy catalyst.

[0039] Comparative Example 1

[0040] The difference between this comparative example and Example 1 is that the Hγ zeolite sample that is not treated with ODA is used as the carrier, and the resulting catalyst is denoted as Pd / Hγ catalyst.

[0041] Example 2

[0042] This example provides a preparation method for a bifunctional heterogeneous Pt-based catalyst for the rapid release of hydrogen at low temperature from a hydrogen storage material in slurry, which comprises the following steps:

[0043] Step 1: Add 5 g of TMS to 20 g of toluene to prepare a solution. Weigh 10 g of TS-1 zeolite and add it to the above solution, and stir magnetically at room temperature for 2 h. Filter and wash the precipitate with toluene, and dry the obtained precipitate at 100°C to obtain TMS-TS-1 zeolite.

[0044] Step 2: Weigh 0.1053 g of H2PtCl6 and dissolve it in 15 mL of water. Add 4.95 g of the TMS-TS-1 zeolite described above to the solution, and immerse it for 4 h. After drying, the sample is reduced in a 10% H2 / Ar atmosphere at 5°C / min to 450°C for 4 h to obtain a Pt / TMS-TS-1 catalyst.

[0045] Comparative Example 2

[0046] The difference between this comparative example and Example 2 is that the TS-1 zeolite sample that is not treated with TMS is used as the carrier, and the resulting catalyst is denoted as Pt / TS-1 catalyst.

[0047] Example 3

[0048] This example provides a preparation method for a bifunctional heterogeneous Ir-based catalyst for the rapid release of hydrogen at low temperature from a hydrogen storage material in slurry, which comprises the following steps:

[0049] Step 1: Weigh 10 g of TS-1 zeolite, add 5 mL of deionized water, and stir until uniform. Then add 100 mL of a toluene solution containing 5 mmol of n-octadecyltrichlorosilane (OTS), and stir thoroughly. Filter and wash the precipitate with CCl4 and ethanol, and dry to obtain OTS-TS-1 zeolite.

[0050] Step 2: 0.1313 g of H2IrCl6·6H2O was dissolved in 15 mL of water solution. To this solution, 4.95 g of OTS-TS-1 zeolite was added and impregnated for 4 h. After drying, the sample was reduced in 10% H2 / Ar atmosphere at 5 ℃ / min to 450 ℃ for 4 h to obtain the Ir / OTS-TS-1 catalyst.

[0051] Comparative Example 3

[0052] The difference between this comparative example and Example 3 is that TS-1 zeolite sample without OTS treatment was used as the carrier, and the obtained catalyst is recorded as Ir / TS-1 catalyst.

[0053] Comparative Example 4

[0054] The difference between this comparative example and Example 1 is that Acid-Hγ zeolite was used as the carrier, and the obtained catalyst is recorded as Pd / Acid-Hγ catalyst. The preparation method of Acid-Hγ zeolite is as follows: 10 g of Hγ zeolite was added into 100 mL of 3 mol / L HNO3 solution, and stirred at 60 ℃ for 24 h. After washing with deionized water, Acid-Hγ zeolite was obtained.

[0055] Comparative Example 5

[0056] The difference between this comparative example and Example 1 is that Alkali-Hγ zeolite was used as the carrier, and the obtained catalyst is recorded as Pd / Acid-Hγ catalyst. The preparation method of Alkali-Hγ zeolite is as follows: 10 g of Hγ zeolite was added into 100 mL of 0.8 mol / L NaOH solution, and stirred at 60 ℃ for 24 h. After washing with deionized water, Alkali-Hγ zeolite was obtained.

[0057] Comparative Example 6

[0058] The difference between this comparative example and Example 1 is that MCM-22 zeolite was used as the carrier, and the obtained catalyst is recorded as Pd / MCM-22 catalyst.

[0059] Comparative Example 7

[0060] The difference between this comparative example and Example 1 is that mordenite was used as the carrier, and the obtained catalyst is recorded as Pd / mordenite catalyst.

[0061] Comparative Example 8

[0062] The difference between this comparative example and Example 1 is that multi-walled carbon nanotube CNT was used as the carrier, and the obtained catalyst is recorded as Pd / CNT catalyst.

[0063] Application Example

[0064] In an inert gas environment, 2 g of the catalyst prepared in each of the above examples and comparative examples was mixed with 8 g of aluminum powder (average particle size 50 μm) and subjected to mechanical ball milling treatment (ball-to-material ratio 10:1, ball milling time 2 hours, ball milling speed 400 rpm) to prepare an activated aluminum hydrolysis hydrogen production material; in an inert gas environment, 5 g of the activated aluminum hydrolysis hydrogen production material was mixed with 20 g of an organic liquid hydrogen storage material and subjected to ball milling treatment (ball-to-material ratio 10:1, ball milling time 2 hours, ball milling speed 400 rpm) to obtain an aluminum-based slurry hydrogen storage material.

[0065] In which, according to the different organic liquid hydrogen storage materials used in each example and comparative example, the aluminum-based slurry hydrogen storage material prepared in Example 1 is denoted as Al (Pd / ODA-Hγ)-12H-NPCZ; the aluminum-based slurry hydrogen storage material prepared in Comparative Example 1 is denoted as Al (Pd / Hγ)-12H-NPCZ. The aluminum-based slurry hydrogen storage material prepared in Example 2 is denoted as Al (Pt / TMS-TS-1)-18H-DBT; the aluminum-based slurry hydrogen storage material prepared in Comparative Example 2 is denoted as Al (Pt / TS-1)-18H-DBT. The aluminum-based slurry hydrogen storage material prepared in Example 3 is denoted as Al (Ir / OTS-TS-1)-8H-2-MID. The aluminum-based slurry hydrogen storage material prepared in Comparative Example 3 is denoted as Al (Ir / TS-1)-8H-2-MID. The aluminum-based slurry hydrogen storage materials prepared in Comparative Examples 4-8 are denoted as Al (Pd / Acid-Hγ)-12H-NPCZ, Al (Pd / Alkali-Hγ zeolite)-12H-NPCZ, Al (Pd / MCM-22)-12H-NPCZ, Al (Pd / mordenite)-12H-NPCZ, Al (Pd / CNT)-12H-NPCZ, respectively.

[0066] Performance test

[0067] At 90°C, 5 g of the aluminum-based slurry hydrogen storage material prepared in the above application example was placed in a two-necked flask, and 50 ml of deionized water was added. The hydrogen gas generated during the reaction was collected by the drainage gas collection method, and the weight change of the discharged water was monitored in real time to draw a curve of the hydrogen production amount versus time, and the total hydrogen production volume V after the reaction was completed. The liquid phase product in the two-necked flask was allowed to stand and separate into layers, and the organic phase was analyzed by gas chromatography-mass spectrometry (GC-MS) to determine the hydrogen release volume V LOHC of the organic liquid hydrogen storage material, and then the hydrogen volume V Al generated by the aluminum hydrolysis reaction was calculated (all the above volumes are converted into the volume under standard conditions). The comparison of the curves of the hydrogen production amount versus time of the catalysts prepared in Examples 1-3 and Comparative Examples 1-8 in application is shown in Figure 1 As shown in Table 1, the hydrogen production amount and conversion rate of each component after 80 min of hydrolysis of Examples 1-3 and Comparative Examples 1-8.

[0068] Depend on Figure 1 It is evident that, under the catalytic action of the catalysts provided in Examples 1-3, high-conversion hydrogen release rates of 12H-NPCZ, 8H-2-MID, and 18H-DBT can be achieved at a test temperature of only 90°C, without the need for higher temperatures. The Al(Pd / ODA-Hγ)-12H-NPCZ, Al(Pt / TMS-TS-1)-18H-DBT, and Al(Ir / OTS-TS-1)-8H-2-MID prepared in the application examples achieved conversion rates of 86.3%, 77.2%, and 87.8% respectively within 20 minutes. Compared to the unmodified catalysts (Comparative Examples 1-3), the hydrogen release conversion rates were all significantly improved.

[0069] Table 1

[0070]

[0071] Furthermore, from Table 1 above,

[0072] Based on the comparison between Example 1 and Comparative Example 1, Example 2 and Comparative Example 2, and Example 3 and Comparative Example 3, it can be seen that organic molecules such as ODA, TMS, and OTS are adsorbed at the acidic sites on the zeolite surface. This adsorption mainly occurs in the form of chemical reactions, ensuring their stability on the zeolite surface. Because these molecules possess lipophilic alkyl chains and hydrophilic amine groups, the modified ODA-Hγ, TMS-TS-1, and OTS-TS-1 zeolites exhibit strong adsorption capacity for both aqueous and organic phases, significantly improving the hydrogen production rate of catalytic aluminum hydrolysis and the hydrogen release rate of organic liquid hydrogen storage materials. This facilitates rapid heat transfer from the aqueous phase to the organic phase, achieving efficient thermal coupling.

[0073] Based on the comparison between Example 1 and Comparative Example 4, and between Example 1 and Comparative Example 7, it can be seen that the acid-treated Hγ zeolite and mordenite have weak adsorption capacity for organic phases and poor performance in catalyzing the hydrogen release of organic liquid hydrogen storage materials.

[0074] Based on the comparison between Example 1 and Comparative Example 5, and between Example 1 and Comparative Example 6, it can be seen that the Hγ zeolite and MCM-22 treated with alkali have weak adsorption capacity for the aqueous phase, which reduces the rate of hydrogen production from aluminum hydrolysis and also reduces the heat transfer efficiency, thus decreasing the hydrogen release performance of the organic liquid hydrogen storage material.

[0075] Based on the comparison between Example 1 and Comparative Example 8, it can be seen that when an inert carrier such as multi-walled carbon nanotubes is used, the formation of an oxide film on the surface of the aluminum-based material during the hydrolysis process cannot be suppressed, the aluminum hydrolysis reaction is hindered, and sufficient heat cannot be generated for the organic liquid hydrogen storage material to release hydrogen.

[0076] The above merely preferred embodiments of the present application, and not therefore limit the embodiments and protection scope of the present application, for those skilled in the art, it should be realized that the equivalent replacement and obvious changes made by the application description, the resulting scheme should be included in the protection scope of the present application.

Claims

1. Application of a bifunctional heterogeneous noble metal catalyst in low-temperature rapid hydrogen release of slurry hydrogen storage materials, characterized in that, The bifunctional heterogeneous noble metal catalyst is mixed with aluminum powder under an inert atmosphere, and is subjected to ball milling to obtain an activated aluminum hydrolysis hydrogen production material; the activated aluminum hydrolysis hydrogen production material is mixed with an organic liquid hydrogen storage material, and is subjected to ball milling to obtain an aluminum-based slurry hydrogen storage material. The preparation method of the bifunctional heterogeneous noble metal catalyst comprises the following steps: dissolving a modifier in a solvent to obtain a modifier solution; the modifier is selected from amphiphilic organic molecules having hydrophilic and lipophilic groups or structures; adding a zeolite into the modifier solution to perform liquid phase chemical plating to obtain a modified zeolite; placing the modified zeolite in a noble metal salt solution for impregnation treatment, and then placing the modified zeolite in a reducing atmosphere for reduction treatment to obtain the bifunctional heterogeneous noble metal catalyst.

2. Use according to claim 1, characterized in that, The modifier is selected from a combination of one or more of octadecylamine ODA, trimethylchlorosilane TMS and n-octadecyltrichlorosilane OTS.

3. Use according to claim 1, characterized in that, The concentration of the modifier solution is 0.01-0.2 g / mL, and the mass-volume ratio of the zeolite to the modifier solution is 0.1-0.5 g / mL.

4. Use according to claim 1, characterized in that, The zeolite comprises a combination of one or more of Hγ zeolite, TS-1 zeolite, HZSM-5 zeolite, MCM-22 zeolite and mordenite.

5. The use according to claim 1, characterized in that, The liquid phase chemical plating is performed under stirring, and the stirring temperature is 20-50℃, and the stirring time is 2-4 h.

6. Use according to claim 1, characterized in that, The noble metal of the noble metal salt solution comprises a combination of one or more of Pd, Pt and Ir; and the loading amount of the noble metal in the bifunctional heterogeneous noble metal catalyst is 0.5wt.%-3wt.%.

7. The use according to claim 1, characterized in that, The reduction treatment is performed at a temperature of 350-550℃ for 3-5 h.

8. The use according to claim 1, characterized in that, The organic liquid hydrogen storage material comprises a combination of one or more of perhydro-N-propylcarbazole 12H-NPCZ, perhydro-dibenzyltoluene 18H-DBT, perhydro-2-methylindole 8H-2-MID and perhydro-N-ethylcarbazole 12H-NECZ.

9. The use according to claim 1, characterized in that, In the aluminum-based slurry hydrogen storage material, the hydrogen release conversion rate of the organic liquid hydrogen storage material under the action of the activated aluminum hydrolysis hydrogen production material is 77.2%-87.8% after hydrolysis for 20 min at an ambient temperature of 70-100℃.

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