CN107021527A - A kind of high activity chemical chain hydrogen storage material and preparation method thereof - Google Patents
A kind of high activity chemical chain hydrogen storage material and preparation method thereof Download PDFInfo
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- CN107021527A CN107021527A CN201710219102.6A CN201710219102A CN107021527A CN 107021527 A CN107021527 A CN 107021527A CN 201710219102 A CN201710219102 A CN 201710219102A CN 107021527 A CN107021527 A CN 107021527A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/0018—Mixed oxides or hydroxides
- C01G49/0045—Mixed oxides or hydroxides containing aluminium
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/0005—Reversible uptake of hydrogen by an appropriate medium, i.e. based on physical or chemical sorption phenomena or on reversible chemical reactions, e.g. for hydrogen storage purposes ; Reversible gettering of hydrogen; Reversible uptake of hydrogen by electrodes
- C01B3/001—Reversible uptake of hydrogen by an appropriate medium, i.e. based on physical or chemical sorption phenomena or on reversible chemical reactions, e.g. for hydrogen storage purposes ; Reversible gettering of hydrogen; Reversible uptake of hydrogen by electrodes characterised by the uptaking medium; Treatment thereof
- C01B3/0078—Composite solid storage mediums, i.e. coherent or loose mixtures of different solid constituents, chemically or structurally heterogeneous solid masses, coated solids or solids having a chemically modified surface region
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a kind of high activity chemical chain hydrogen storage material and preparation method thereof, the material is prepared using solvent-thermal method, first by FeCl2·4H2O, MgCl2·6H2O, AlCl3·6H2O and urea, by 1~3:1:1:7 mol ratio is dissolved in methanol, resulting solution solvent heat treatment in autoclave, and obtained product vacuum is dried, and obtains the high activity chemical chain hydrogen storage material with layered double hydroxide (LDH) structure.The material uses recycle chemistry chain oxygen hydrogen storage principle, create Lacking oxygen again by Lacking oxygen inversion produce hydrogen by way of indirect hydrogen storage, a Lacking oxygen inversion in theory obtains two hydrogen, and hydrogen-storage density is twice of traditional hydrogen room hydrogen storage.The material has petal-shaped LDH structures, and specific surface area is big, is Fe2+More attachment sites are provided；The suction-operated of crystalline state aluminous layer plate in material so that Mg2+、Fe2+Uniform and stable distribution in laminate, reactant is sufficiently contacted with activated centre, these factors all substantially increase the reactivity of material.
Description
Technical field
The present invention relates to material prepare and chemical chain hydrogen storage field, more particularly to a kind of high activity chemical chain hydrogen storage material and
Its preparation method.
Background technology
Hydrogen Energy is that a kind of combustion heat value is big, and free of contamination regenerative resource is considered as 21 century most potential
Clean energy resource.Effectively using Hydrogen Energy key be exploitation efficiently, can large-scale application hydrogen storage technology.
Hydrogen storage technology common at present is divided into physics hydrogen storage and chemical hydrogen storage.High-pressure hydrogen storing and hydraulic pressure storage in physics hydrogen storage
Hydrogen, has been able to realize the Hydrogen Energy storage of large-scale commercial, but the next potential safety hazard of high pressure belt remains unchanged and governs both
The application of hydrogen storage technology, in addition, high-pressure hydrogen storing and the shortcomings of hydraulic pressure hydrogen storage also has high energy consumption, floor space is big；Chemistry
Hydrogen storage main embodiment has hydrogen bearing alloy, metal hydride and organic matter hydrogen storage etc..Chemical hydrogen storage material has hydrogen-storage density
It is high, the advantages of reaction condition is gentle, security is good.But too high due to preparing cost, chemical hydrogen storage material is now also in experiment
Room conceptual phase, has no commercialization report.Popularization of the shortcomings of easily the polluting environment also to chemical hydrogen storage technology brings difficulty.
Recycle chemistry chain oxygen hydrogen storage technology is a kind of new hydrogen storage technology, and its innovation is using between Lacking oxygen
Hydrogen storage is connect, because Lacking oxygen two hydrogen of correspondence, the theoretical hydrogen-storage density of circulation Lacking oxygen hydrogen storage material is traditional
Twice of hydrogen room hydrogen storage material.Illustrate its hydrogen storage principle by taking ferro-cobalt oxygen carrier as an example：
Hydrogen storage process：
Release hydrogen process：
Active component in oxygen carrier is ferriferous oxide.During hydrogen storage, the oxygen in ferriferous oxide is combined with hydrogen becomes water,
Ferriferous oxide is reduced to low price ferriferous oxide.Every 1 oxygen atom combines 2 hydrogen atoms, and correspondence produces a Lacking oxygen.Release hydrogen
During, the oxygen that 1 Lacking oxygen is cracked in 1 molecular water, water is stayed in Lacking oxygen, and hydrogen is then discharged in the form of hydrogen, together
When low price ferriferous oxide be oxidized, oxygen carrier can be re-used for hydrogen storage, so as to realize that the reversible of hydrogen is stored.
Nowadays, it is an important problem to design and prepare high performance chemical chain hydrogen storage material.Existing chemical chain hydrogen storage
Material is prepared usually using methods such as sol-gal process, mechanical mixing, infusion processes, material charge and discharge hydrogen speed prepared by these methods
Rate is relatively low, and hydrogen storage releases hydrogen, and time-consuming.Therefore, the preparation method of the chemical chain hydrogen storage material of research and development high activity is significant.
The content of the invention
Technical problem：In order to solve the problem of existing chemical chain hydrogen storage material reactivity is weak, the present invention provides a kind of high
Activity chemistry chain hydrogen storage material and preparation method thereof, the chemical chain hydrogen storage material of preparation has LDH structures, and specific surface area is big, instead
The active center distribution answered is uniform and stable, and the reactivity of material is greatly improved.
Technical scheme：A kind of high activity chemical chain hydrogen storage material chemical formula of the present invention is FexMgAlO1.5X+2.5, wherein 1
≤ X≤3, the hydrogen storage material has petal-shaped layered double hydroxide (LayeredDoubleHydroxide, LDH) knot
Structure, hydrogen storage material laminate laminate is combined to form by oxonium ion and metal ion by electrostatic interaction.Under electrostatic force, metal
Ion forms the activated centre of stable homogeneous distribution in stratiform laminate.
Wherein：
The metal ion is Fe2+、Mg2+、Al3+。
The hydrogen storage material specific surface area is 200-300m2/g。
The present invention high activity chemical chain hydrogen storage material preparation method using solvent-thermal method preparation, by iron, magnesium, aluminium water
Chlorate is closed with urea using mol ratio as (1~3):1：1：7 dissolvings in methyl alcohol, said mixture are handled with solvent-thermal method, will
Product is centrifuged, and is washed with deionized water and ethanol several times, after drying.
In preparation process, the solvent-thermal method process step is that said mixture has been transferred into polytetrafluoroethyllining lining
In autoclave, oil bath heating 24 hours at 170~190 DEG C.
After the product centrifugation, washing, dried 12~14 hours at 70~80 DEG C in drying box.
Beneficial effect：Compared with prior art, the present invention at least has the advantages that：
1. novel hydrogen storage material prepared by the present invention uses recycle chemistry chain hydrogen storage principle, empty by creating oxygen in the material
Position, then by Lacking oxygen inversion produce hydrogen the indirect hydrogen storage of mode, in theory a Lacking oxygen possibility of reversal obtain two hydrogen, therefore hydrogen storage
Density will be twice of traditional hydrogen room.The mass fraction of material hydrogen storage is up to more than 4.8%, and volume hydrogen-storage density is reachable
120kg/m3More than
2. high activity chemical chain hydrogen storage material prepared by the present invention has a petal-shaped LDH structures, specific surface area it is big (200-
300m2/ g), the uniform and stable reactivity for being distributed in laminate, greatly improving material in activated centre.Material hydrogen storage process
Time-consuming 5~10min, it is only the 25~40% of general oxygen carrier material to release hydrogen process time-consuming, takes 2~3min.
3. the present invention uses cheap chlorine metal salt for raw material, and preparation technology is simple, can be with large-scale production.
Brief description of the drawings
Fig. 1 is the SEM figures of the high activity chemical chain hydrogen storage material prepared by embodiment 1.
Fig. 2 is the XRD of the high activity chemical chain hydrogen storage material prepared by embodiment 1.
Fig. 3 is the SEM figures of the high activity chemical chain hydrogen storage material prepared by embodiment 2.
Fig. 4 is the XRD of the high activity chemical chain hydrogen storage material prepared by embodiment 2.
Fig. 5 is the material situation that hydrogen-storage density changes in the circulation of charge and discharge hydrogen of different Fe-Mg-Al mol ratios, reaction
Temperature is 900 DEG C.
Fig. 6 is that the material of different Fe-Mg-Al mol ratios releases hydrogen rate curve during hydrogen is released, and reaction temperature is
900℃。
Embodiment
In order to achieve the above object, a kind of high activity chemical chain hydrogen storage material that the present invention takes, its hydrogen storage principle is change
Chain circulation oxygen hydrogen storage is learned, using manufacturing Lacking oxygen in the material, then the indirect hydrogen storage of mode of hydrogen is produced by Lacking oxygen inversion.This material
With petal-shaped LDH structures, the big (200-300m of specific surface area2/ g), can be Fe2+More attachment sites are provided, and due to
The suction-operated of the aluminous layer plate of crystalline state so that Mg2+、Fe2+Into in stratiform laminate, uniform and stable point is formed in laminate
The activated centre of cloth.
The preparation method of the high activity chemical chain hydrogen storage material of the present invention, is prepared using solvent-thermal method, is had preparation method and is,
By FeCl2·4H2O, MgCl2·6H2O, AlCl3·6H2O and urea, by (1~3):1:1:7 stoichiometric proportion is dissolved in methanol
In, it has been transferred to after stirring in polytetrafluoroethyllining lining autoclave, in confined conditions, in 170~190 DEG C of oil baths
Heating 24 hours.Product is centrifuged, 12~14 are dried at 70~80 DEG C in drying box with deionized water and alcohol flushing several times
Hour, produce target material.
The material is prepared under different reactant concentrations：
Embodiment 1：
Amount of solution is 0.03L 0.2mol/l FeCl2·4H2O, 0.1mol/l MgCl2·6H2O, 0.1mol/l
AlCl3·6H2O and 0.7mol/l urea is dissolved in 30mL methanol.Said mixture is stirred, poly- four have been then transferred into
In PVF liner autoclave, in confined conditions, heated 24 hours at 180 DEG C, after the product centrifugation, use deionization
Water and alcohol flushing several times, and are dried 12 hours in electric dry oven at 70 DEG C.Obtain flower-shaped FeMgAl-LDH balls.
Embodiment 2：
The molar concentration that amount of solution is 0.03L is respectively 0.1mol/l FeCl2·4H2O, 0.05mol/l's
MgCl2·6H2O, 0.05mol/l AlCl3·6H2O and 0.35mol/l urea is dissolved in 30mL methanol.Stirring is above-mentioned mixed
Compound, has been then transferred into polytetrafluoroethyllining lining autoclave, in confined conditions, is heated 24 hours at 180 DEG C, institute
State after product centrifugation, and dried 12 hours at 70 DEG C in electric dry oven with deionized water and alcohol flushing several times.Obtain flower-shaped
FeMgAl-LDH balls.
It can be seen from XRD the and SEM characterization results of embodiment 1 and embodiment 2 under both operating modes, material all shapes
Into obvious petal-shaped LDH structures, XRD characterization results display that the characteristic peak of LDH structures.
Fig. 5 is the material situation that hydrogen-storage density changes in the circulation of charge and discharge hydrogen of different Fe-Mg-Al mol ratios.It can be seen that
Material hydrogen-storage density kept stable after 20 circulations, wherein mol ratio are 3:1:2,5:1:2,7:1:2 three kinds of materials, storage
Hydrogen density is basically stable at 5000umolg-1。
Fig. 6 releases the change curve of hydrogen speed for the material of different Fe-Mg-Al mol ratios during hydrogen is released, when releasing hydrogen
Speed thinks that reaction is complete when being less than 10umolg-1s-1, then three kinds of materials are released hydrogen and taken all in 2min or so, release hydrogen mistake
Journey is time-consuming to be far below existing hydrogen storage material.
Description is described in detail to the specific embodiment of the present invention above, and the product of different embodiments is showed
As being described, but it is intended only as example, and the present invention is not restricted to particular embodiments described above.For this area
For technical staff, any equivalent modifications carried out to the present invention and replacement are also all among scope of the invention.Therefore, not
Depart from the impartial conversion made under the spirit and scope of the present invention and change, all should be contained within the scope of the invention.
Claims (6)
1. a kind of high activity chemical chain hydrogen storage material, it is characterised in that described hydrogen storage material chemical formula is
FexMgAlO1.5X+2.5, wherein 1≤X≤3, the hydrogen storage material has petal-shaped layered double hydroxide structure, hydrogen storage material
Laminate laminate is combined to form by oxonium ion and metal ion by electrostatic interaction, under electrostatic force, and metal ion is in stratiform
The activated centre of stable homogeneous distribution is formed in laminate.
2. a kind of high activity chemical chain hydrogen storage material according to claim 1, it is characterised in that the metal ion is Fe2 +、Mg2+、Al3+。
3. a kind of high activity chemical chain hydrogen storage material according to claim 1, it is characterised in that the hydrogen storage material compares table
Area is 200-300m2/g。
4. a kind of preparation method of high activity chemical chain hydrogen storage material as claimed in claim 1, it is characterised in that use solvent
Prepared by hot method, by iron, magnesium, the chloride hydrate salt of aluminium and urea using mol ratio as (1~3):1：1：7 dissolvings in methyl alcohol, with molten
The hot method processing said mixture of agent, product is centrifuged, washed with deionized water and ethanol several times, after drying.
5. a kind of preparation method of high activity chemical chain hydrogen storage material according to claim 4, it is characterised in that：Preparing
During, the solvent-thermal method process step is that said mixture has been transferred in polytetrafluoroethyllining lining autoclave,
Oil bath heating 24 hours at 170~190 DEG C.
6. a kind of preparation method of high activity chemical chain hydrogen storage material according to claim 4, it is characterised in that：The production
After thing centrifugation, washing, dried 12~14 hours at 70~80 DEG C in drying box.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108716007A (en) * | 2018-05-30 | 2018-10-30 | 天津大学 | The method for improving hydroxide electrocatalytic hydrogen evolution reactivity worth by Lacking oxygen engineering |
| CN109208030A (en) * | 2018-11-16 | 2019-01-15 | 北京师范大学 | A kind of Metal Hydroxide-Metal organic frame composite material and preparation method |
| CN110817970A (en) * | 2019-12-11 | 2020-02-21 | 宝鸡文理学院 | Preparation of M from water supply sludge2+-Al3+-Fe3+Method for preparing hydrotalcite-like material and application thereof |
| CN111013607A (en) * | 2019-12-26 | 2020-04-17 | 福州大学 | Iron nickel sulfide with in-situ conversion sulfur vacancy as well as preparation method and application thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108716007A (en) * | 2018-05-30 | 2018-10-30 | 天津大学 | The method for improving hydroxide electrocatalytic hydrogen evolution reactivity worth by Lacking oxygen engineering |
| CN109208030A (en) * | 2018-11-16 | 2019-01-15 | 北京师范大学 | A kind of Metal Hydroxide-Metal organic frame composite material and preparation method |
| CN109208030B (en) * | 2018-11-16 | 2020-04-17 | 北京师范大学 | Metal hydroxide-metal organic framework composite material and preparation method thereof |
| CN110817970A (en) * | 2019-12-11 | 2020-02-21 | 宝鸡文理学院 | Preparation of M from water supply sludge2+-Al3+-Fe3+Method for preparing hydrotalcite-like material and application thereof |
| CN110817970B (en) * | 2019-12-11 | 2022-03-29 | 宝鸡文理学院 | Preparation of M from water supply sludge2+-Al3+-Fe3+Method for preparing hydrotalcite-like material and application thereof |
| CN111013607A (en) * | 2019-12-26 | 2020-04-17 | 福州大学 | Iron nickel sulfide with in-situ conversion sulfur vacancy as well as preparation method and application thereof |
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