[Abstract] The invention relates to fuel cell technology, aiming at providing a direct sodium borohydride fuel cell with ferrocene as cathode catalyst, which uses alkaline sodium borohydride aqueous solution containing 10wt% nabh4 and 5wt%NaOH as fuel; Use air or pure oxygen as oxidant; Use perfluorosulfonic acid resin as electrolyte; The anode catalyst is one or a mixture of the following: noble metal catalysts Pt, Pd, Au, Ag and their alloys; Non-noble metal catalysts nickel, iron, cobalt, manganese, chromium, titanium and their alloys; Hydrogen storage materials MmNi 5-x M x, Zr 1-x Ti x Ni 2-y N y, where the value range of x is 0.0 1 ~. The cathode of fuel cell takes ferrocene as cathode catalyst. The invention has the advantages that sodium borohydride has higher hydrogen storage density, and noble metal is not needed as anode catalyst in electrochemical oxidation reaction, so it has higher electromotive force and energy density; It can effectively reduce the cost of fuel cells, solve the problem of lack of platinum resources, and is conducive to the popularization of fuel cell technology.
Method for removing colloidal products of hydrogen production by decomposition of sodium borohydride
[Abstract] The invention discloses a method for removing colloidal products of hydrogen production by decomposition of sodium borohydride, which is characterized in that a positive electrode and a negative electrode are added in a container filled with NaBH 4 solution, and a DC power supply is connected between the two electrodes, so that the sodium metaborate colloid generated by decomposition of NaBH 4 moves to the positive electrode in an electrophoretic manner and is removed. Any one of the two electrodes is a stainless steel electrode, a carbon paper electrode, a nickel foam electrode or a copper electrode. By selecting the electrode material, the method of removing sodium metaborate colloid by electrophoresis can be carried out smoothly without introducing impurities, and the electrode itself is guaranteed to be close to zero power consumption in the degumming process.
Preparation of sodium borohydride from boron phosphate in dry state.
The invention belongs to a preparation method of alkali metal borohydride. When sodium borohydride is prepared from boron phosphate by dry method, anhydrous boron phosphate with particle size larger than 120 mesh is used as raw material, and the molar ratio of its dosage to sodium block is1:3.2 ~1:4.8, and inert inorganic sodium salt is used as dispersant (the dosage accounts for 30 ~ 60% of the total weight of reactants). Hydrogen is introduced into the reaction system to maintain positive pressure. The reaction temperature is 300-360℃ ... The purity of sodium borohydride prepared by the invention is more than 97% (calculated by active hydrogen), the reaction conversion rate is about 50% (calculated by Na), the process is simple, the product is easy to extract and separate, and it is widely used in boron-containing high-energy fuel, fine organic synthesis, pharmacy, paper making and textile industries.
Method for preparing hydrogen from sodium borohydride-hydrazine mixed fuel
[Abstract] The invention discloses a method for preparing hydrogen, in particular to a method for preparing hydrogen by using sodium borohydride-hydrazine mixed fuel. Comprises the following steps: dissolving sodium borohydride powder in hydrazine hydrate N 2 H 4? H 2 O to obtain sodium borohydride-hydrazine mixed aqueous solution, and adding water to make the mass ratio of sodium borohydride: hydrazine: water in the mixed aqueous solution100: 20 ~100:100 ~ 200; The mixed aqueous solution of sodium borohydride and hydrazine passes through a reactor with a catalyst and is hydrolyzed under the action of the catalyst to obtain a mixed gas of hydrogen and nitrogen, and the hydrogen product is obtained after separation. Hydrazine is a chemical hydride with higher hydrogen content than sodium borohydride. Adding hydrazine can not only improve the stability of sodium borohydride, but also improve the energy density of fuel. Hydrazine will make hydrogen production more convenient and have higher energy density.
[23627-000 1-0005] Method and reactor for producing hydrogen by catalytic hydrolysis of sodium borohydride.
[Abstract] The invention discloses a method and a reactor for producing hydrogen by catalytic hydrolysis of sodium borohydride, belonging to hydrogen production technology. In this method, an aqueous solution with sodium borohydride concentration of 5-40% (mass) and sodium hydroxide concentration of 0. 1-20% (mass) is added into a reactor to generate hydrogen under the action of a catalyst, and the reaction heat is removed in time. It is characterized in that an aqueous solution of composite metal ions or an amorphous alloy generated by hydrolysis of composite metal ions in sodium borohydride is used as a catalyst. The reactor comprises a shell, a stirrer, a feed pipe and an air outlet, and is characterized in that the reactor is provided with a double-cavity communication pipe vapor-liquid circulating heat exchanger consisting of an evaporation chamber arranged in the shell, a condensation chamber arranged outside the shell and a communication pipe between them. The invention has the advantages of rapid discharge of reaction heat from the reactor, safe use, convenient transportation and high purity of hydrogen. The catalyst can be recycled without deactivation.
[23627-00 13-0006] direct sodium borohydride-hydrazine hybrid fuel cell
The invention discloses a hybrid fuel cell, aiming at providing a direct sodium borohydride-hydrazine hybrid fuel cell. The hybrid fuel cell comprises a fuel cell connected with a blower, a fuel tank and a miniature infusion pump; The outlet at that bottom of the fuel tank is sequentially connecte with a miniature infusion pump and a fuel cell through a pipeline, and the outlet of the fuel cell is connected with the upper part of the fuel tank, wherein the upper part of the fuel tank is provide with a gas outlet and a fuel injection port, and the lower part is provided with a residual liquid outlet; The fuel solution is circulated by a miniature infusion pump; The fuel in the fuel tank is a mixed aqueous solution of sodium borohydride and hydrazine. Hydrazine is a chemical hydride with higher hydrogen content than sodium borohydride. Adding hydrazine can not only improve the stability of sodium borohydride, but also improve the energy density of fuel. Hydrazine will make hydrogen production more convenient and energy density higher, and improve the working efficiency of fuel cells.
[23627-00 12-0007] A preparation method of sodium borohydride.
[Abstract] The invention belongs to the technical field of compound preparation, and particularly relates to a preparation method of sodium borohydride. The invention is different from the traditional gas-solid heterogeneous reaction, and sodium borohydride is prepared through the solid-phase reaction of metal hydride and boron-containing compound. The reaction of the invention is completely carried out in the solid substance, and sodium borohydride can be obtained under lower hydrogen pressure or even inert gas atmosphere, thus avoiding the use of high-pressure hydrogen and reducing the requirements for equipment. The method has simple technological process and is easy to realize large-scale production.
Preparation method of tubular reactor for hydrogen production by sodium borohydride-hydrazine mixed fuel
[Abstract] The invention discloses a preparation method of a packed reactor, in particular to a preparation method of a tubular reactor for hydrogen production by sodium borohydride-hydrazine mixed fuel. Comprises the following steps: (1) mixing powder of catalyst precursor materials Ni 3 Al and Co 3 Al, loading into a metal carrier, sintering under the protection of vacuum or inert gas, and then cooling to room temperature; (2) immersing the sintered metal carrier in sodium hydroxide or potassium hydroxide solution, and dealuminating at room temperature until no bubbles appear; (3) loading the dealuminated metal carrier into a tubular reactor. In use, the tubular reactor of the invention does not need to separate the catalyst from the residual liquid, nor does it need to replace the sodium borohydride solution in stages, and can realize continuous hydrogen supply and stable hydrogen supply speed.
[23627-00 10-0009] Method for producing hydrogen by decomposing sodium borohydride with catalyst
[Abstract] The invention discloses a method for producing hydrogen by decomposing sodium borohydride with a catalyst. Two electrodes, one of which is a positive electrode and the other is a negative electrode, are connected between the two electrodes, thereby forming a DC electric field between the two electrodes. Under the action of DC electric field, the sodium metaborate colloid produced by the decomposition of NaBH 4 moves towards the positive electrode in electrophoresis mode and is removed. The method is convenient to implement and can ensure the decomposition reaction to proceed at a relatively stable speed.
[23627-0002-00 10] Preparation method of sodium borohydride
[Abstract] Using borax, metallic sodium and hydrogen as raw materials, sodium borohydride is synthesized in the presence of quartz sand. Compared with the internationally used trimethyl borate method (Schlesiger method), this method has the advantages of easily available raw materials, simple technological process and convenient post-treatment. Compared with the borax method (Bayer method), the reaction can be carried out under normal pressure, and the reaction temperature is lower, the operation is safe, the process is reasonable and economical, and there is basically no pollution of three wastes.
[23627-0011-001] controllable capsule sodium borohydride hydrogen generator
[23627-0009-00 12] Method for reducing polyfluorobenzoic acid into polyfluoromethanol by sodium borohydride
[23627-0014-0013] indirect sodium borohydride-hydrazine hybrid fuel cell
Direct elemental synthesis of [23627-0008-00 14] sodium borohydride
[23627-0006-00 15] A hydrogen donor catalyst for catalytic hydrolysis of sodium borohydride and its preparation method.
[23627-0016-0016] Reaction device and method for hydrogen production by sodium borohydride.
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