CN107162065A - A kind of coal liquefaction FeS2The preparation method of nano tube catalyst - Google Patents
A kind of coal liquefaction FeS2The preparation method of nano tube catalyst Download PDFInfo
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- CN107162065A CN107162065A CN201710323508.9A CN201710323508A CN107162065A CN 107162065 A CN107162065 A CN 107162065A CN 201710323508 A CN201710323508 A CN 201710323508A CN 107162065 A CN107162065 A CN 107162065A
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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
- C01G49/12—Sulfides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/02—Sulfur, selenium or tellurium; Compounds thereof
- B01J27/04—Sulfides
- B01J27/043—Sulfides with iron group metals or platinum group metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/10—Particle morphology extending in one dimension, e.g. needle-like
- C01P2004/13—Nanotubes
Abstract
The present invention relates to a kind of coal liquefaction FeS2Fe is made as soft template using SDBS (neopelex) in the preparation method of nano tube catalyst, this method2O3Precursor body of Nano tube, then by obtained Fe2O3Precursor body of Nano tube and sublimed sulfur are added in ampoule bottle and sealed under vacuumized conditions, and the ampoule bottle after sealing is placed in Muffle furnace and heated, then by the product CS obtained after heating2Multiple washing is centrifuged repeatedly with ethanol, finally it is dried in vacuo at low temperature and obtains coal liquefaction FeS2Nano tube catalyst.Coal liquefaction FeS prepared by the present invention2Nanotube, technique is simple, and discreteness is good, it is easy to industrialization large-scale production.
Description
Technical field
Patent of the present invention is related to a kind of coal liquefaction FeS2The preparation method of nano tube catalyst, belongs to nano material preparation
Field.
Background technology
In catalyst for coal liquefaction, catalyst due to its distinctive low price is easy to get and environment will not be negatively affected and
First choice as catalyst for coal liquefaction, and focus mostly at present in loaded catalyst about the preparation research of catalyst for coal liquefaction and
In the preparation of small size nanoparticle catalyst, and about preparation research of the nanocatalyst in terms of coal liquefaction of special appearance
At present even without relevant report, innovation of the present invention is to have preferable catalytic performance to coal liquefaction catalytic reaction
FeS2For target product, a kind of FeS that can largely prepare is proposed2The synthesis preparation method of nanotube.
FeS2Nano material is excellent by what is shown in fields such as optics, electrode material, catalyst in recent years
Characteristic, for its preparation with studying also more and more, FeS2Its one-dimensional nano structure of nano-tube material is due to being provided simultaneously with
Higher specific surface area and draw ratio, causes the concern of many researchers.At present about FeS2The research of nanotube has
Report, Shi in 2015 etc.【SHI X,TIAN A,XUE X,et al.Synthesis of FeS2(pyrite)nanotube
through sulfuration of Fe2O3nanotube.Materials Letters,2015,141：104-106.】Pass through
Containing water and NH4In F ethylene glycol solution Fe is prepared for using electrochemistry anodic oxidation on Fe pieces3O4Body before nanotube
Body, by by precursor and a certain amount of sulphur powder (pressing sulphur steam pressure 80KPa under heating-up temperature to calculate) in vacuum tube furnace
After heating through two sections, diameter 90 ± 10nm, 15 ± 2nm of wall thickness FeS is finally made2Nanotube, gained FeS2Nanotube is arranged
Row are close orderly., Wang etc. in 2016【WANG M,XUE D,QIN H,et al.Preparation of FeS2nanotube
arrays based on layer-by-layer assembly and their photoelectrochemical
properties.Materials Science and Engineering:B,2016,204：38-44.】Using ZnO nanorod as
Template, Fe has also successfully been prepared using the mode successively assembled2O3Nanotube precursor, is obtained after further vulcanizing treatment
FeS2Nanotube；Li etc.【LI Y,HAN Z,JIANG L,et al.Template-directed synthesis of
ordered iron pyrite(FeS2)nanowires and nanotubes arrays.Journal of Sol-Gel
Science and Technology,2014,72(1):100:105.】It is that template exists using AAO equally based on template
Under conditions of stabilizer is present, tubular nanometer Fe is prepared for by way of dipping2O3Precursor, equally through 500 DEG C of vulcanizing treatments
And go to finally give FeS after removing template2Nanotube.
Above synthetic route is in preparation process, and synthetic route is complex, presoma Fe2O3The preparation process of nanotube
Need to be fixed against hard template to synthesize, be not suitable for a large amount of prepare and synthesize, and the subtractive process of template undoubtedly becomes synthetic route
Obtain cumbersome.
The content of the invention
Patent of the present invention is simple there is provided a kind of technique as soft template using SDBS (neopelex),
Suitable for the coal liquefaction FeS largely synthesized2The preparation method of nanotube, the FeS prepared by this method2Nanotube technology is simple, from
Dissipate property more preferable.
A kind of coal liquefaction FeS2The preparation method of nano tube catalyst, comprises the following steps：
(1) respectively by SDBS, FeCl3·6H2O and NaOH are configured to the SDBS solution that concentration is 0.02mol/L, concentration
0.4mol/L FeCl3Solution and the NaOH solution that concentration is 2mol/L, wherein SDBS and FeCl3·6H2O mol ratio is 1：
(3.3~3.5), NaOH and FeCl3·6H2O mol ratio is (2.4~2.6)：1；
(2) at 60 DEG C, obtained FeCl will be instilled in obtained SDBS solution while stirring3Solution, Ran Houji
Continue the uniform stirring 10min at 60 DEG C, obtain mixed solution A；
(3) at 60 DEG C, obtained NaOH solution will be instilled in mixed solution A obtained by step (2) while stirring, then
Continue the uniform stirring 30min at 60 DEG C, obtain reaction solution B；
(4) the reaction solution B obtained by step (3) is put into reactor, the hydro-thermal process 12h at 180 DEG C；
(5) product obtained by step (4) is centrifuged, and repeatedly washed with deionized water and ethanol successively, so
After be put into baking oven dry, then at 500 DEG C be calcined 2 hours, obtain Fe2O3Precursor body of Nano tube solid powder；
(6) by Fe2O3Precursor body of Nano tube solid powder and sublimed sulfur (addition of the sublimed sulfur according to PV=nRT,
Calculated by vapour pressure 80kpa under reaction temperature, i.e., wherein, P is 80kpa, and V is the volume of ampoule bottle, and R is constant, and T is reaction temperature
Degree, n is the amount of distillation sulfur material) it is added in ampoule bottle, after ampoule bottle is purged several times repeatedly with nitrogen, in vacuumized conditions
It is lower to be sealed, the ampoule bottle after sealing is placed in Muffle furnace, reacted 1~3 hour at 400 DEG C；
(7) by step (6) products therefrom CS2Multiple washing is centrifuged repeatedly with ethanol, then by the product after washing 50
It is dried in vacuo 8~10 hours at DEG C, that is, obtains FeS2Nanotube.
Preferably, the SDBS and FeCl3·6H2O mol ratio is 1：3.4.
Preferably, the NaOH and FeCl3·6H2O mol ratio is 2.5：1.
Coal liquefaction FeS2The preparation method of nano tube catalyst has the advantages that：
(1) Fe is synthesized as template using SDBS2O3Precursor body of Nano tube, template is soft template, it is easy to be stripped, synthesis
Process is simple.
(2) FeS prepared by patent of the present invention2Nanotube, technique is simple, and discreteness more preferably, is adapted to large-scale industry metaplasia
Production.
Brief description of the drawings
Fig. 1 is SDBS and FeCl3·6H2O mol ratio is 1:3.4, NaOH and FeCl3·6H2O mol ratio is 2.5:1
When gained Fe2O3The SEM figures of precursor body of Nano tube solid powder.
Fig. 2 is SDBS and FeCl3·6H2O mol ratio is 1:3.4, NaOH and FeCl3·6H2O mol ratio is 2.5:1
When vulcanization after obtained coal liquefaction FeS2The SEM figures of nano tube catalyst.
Fig. 3 is SDBS and FeCl3·6H2O mol ratio is 1:3.4, NaOH and FeCl3·6H2O mol ratio is 2.5:1
When vulcanization after obtained coal liquefaction FeS2The XRD of nano tube catalyst.
Embodiment
With reference to specific embodiment, the present invention will be further described：
Embodiment 1
As SDBS and FeCl3·6H2O mol ratio is 1:3.3, NaOH and FeCl3·6H2O mol ratio is 2.4:When 1,
0.4167g SDBS, 1.0652g FeCl are weighed respectively3·6H2O and 0.3787g NaOH is standby；The SDBS weighed is matched somebody with somebody
It is set to the SDBS solution that concentration is 0.02mol/L；By the FeCl weighed3·6H2O is configured to the FeCl that concentration is 0.4mol/L3
Solution；The NaOH weighed is configured to the NaOH solution that concentration is 2mol/L.
At 60 DEG C, obtained FeCl will be instilled in obtained SDBS solution while stirring3Solution, is then proceeded to
Uniform stirring 10min, obtains mixed solution A at 60 DEG C1；Continue under 60 DEG C of stirring conditions, by mixed solution A1In while stirring
Obtained NaOH solution is added dropwise, then proceedes to the uniform stirring 30min at 60 DEG C, obtains reaction solution B1。
By reaction solution B1It is put into reactor, then the hydro-thermal process 12h at 180 DEG C is carried out hydro-thermal reaction product
Centrifuge, and repeatedly washed with deionized water and ethanol successively, be then placed in baking oven and dry, then roasting 2 is small at 500 DEG C
When, obtain Fe2O3Precursor body of Nano tube solid powder.
By Fe2O3(addition of sublimed sulfur is warm by reaction according to PV=nRT for precursor body of Nano tube solid powder and sublimed sulfur
The lower vapour pressure 80kpa of degree is calculated, i.e., wherein, P is 80kpa, and V is the volume of ampoule bottle, and R is constant, and T is reaction temperature, and n is to rise
The amount of magnificent sulfur material) it is added in ampoule bottle, after ampoule bottle is purged several times repeatedly with nitrogen, carried out under vacuumized conditions close
Envelope, the ampoule bottle after sealing is placed in Muffle furnace, is reacted 2 hours at 400 DEG C；Resulting production will be reacted in ampoule bottle
Thing CS2Multiple washing is centrifuged repeatedly with ethanol, then the product after washing is dried in vacuo 9 hours at 50 DEG C, is vulcanized
FeS afterwards2Nanotube.
Embodiment 2
As SDBS and FeCl3·6H2O mol ratio is 1:3.3, NaOH and FeCl3·6H2O mol ratio is 2.6:When 1,
0.4079 SDBS, 1.0430g FeCl are weighed respectively3·6H2O and 0.4020g NaOH is standby；The SDBS weighed is matched somebody with somebody
It is set to the SDBS solution that concentration is 0.02mol/L；By the FeCl weighed3·6H2O is configured to the FeCl that concentration is 0.4mol/L3
Solution；The NaOH weighed is configured to the NaOH solution that concentration is 2mol/L.
At 60 DEG C, obtained FeCl will be instilled in obtained SDBS solution while stirring3Solution, is then proceeded to
Uniform stirring 10min, obtains mixed solution A at 60 DEG C2；Continue under 60 DEG C of stirring conditions, by mixed solution A2In while stirring
Obtained NaOH solution is added dropwise, then proceedes to the uniform stirring 30min at 60 DEG C, obtains reaction solution B2。
By reaction solution B2It is put into reactor, then the hydro-thermal process 12h at 180 DEG C is carried out hydro-thermal reaction product
Centrifuge, and repeatedly washed with deionized water and ethanol successively, be then placed in baking oven and dry, then roasting 2 is small at 500 DEG C
When, obtain Fe2O3Precursor body of Nano tube solid powder.
By Fe2O3(addition of sublimed sulfur is warm by reaction according to PV=nRT for precursor body of Nano tube solid powder and sublimed sulfur
The lower vapour pressure 80kpa of degree is calculated, i.e., wherein, P is 80kpa, and V is the volume of ampoule bottle, and R is constant, and T is reaction temperature, and n is to rise
The amount of magnificent sulfur material) it is added in ampoule bottle, after ampoule bottle is purged several times repeatedly with nitrogen, carried out under vacuumized conditions close
Envelope, the ampoule bottle after sealing is placed in Muffle furnace, is reacted 2 hours at 400 DEG C；Resulting production will be reacted in ampoule bottle
Thing CS2Multiple washing is centrifuged repeatedly with ethanol, then the product after washing is dried in vacuo 9 hours at 50 DEG C, is vulcanized
FeS afterwards2Nanotube.
Embodiment 3
As SDBS and FeCl3·6H2O mol ratio is 1:3.5, NaOH and FeCl3·6H2O mol ratio is 2.4:When 1,
0.3927g SDBS, 1.0651g FeCl are weighed respectively3·6H2O and 0.3786g NaOH is standby；The SDBS weighed is matched somebody with somebody
It is set to the SDBS solution that concentration is 0.02mol/L；By the FeCl weighed3·6H2O is configured to the FeCl that concentration is 0.4mol/L3
Solution；The NaOH weighed is configured to the NaOH solution that concentration is 2mol/L.
At 60 DEG C, obtained FeCl will be instilled in obtained SDBS solution while stirring3Solution, is then proceeded to
Uniform stirring 10min, obtains mixed solution A at 60 DEG C3；Continue under 60 DEG C of stirring conditions, by mixed solution A3In while stirring
Obtained NaOH solution is added dropwise, then proceedes to the uniform stirring 30min at 60 DEG C, obtains reaction solution B3。
By reaction solution B3It is put into reactor, then the hydro-thermal process 12h at 180 DEG C is carried out hydro-thermal reaction product
Centrifuge, and repeatedly washed with deionized water and ethanol successively, be then placed in baking oven and dry, then roasting 2 is small at 500 DEG C
When, obtain Fe2O3Precursor body of Nano tube solid powder.
By Fe2O3(addition of sublimed sulfur is warm by reaction according to PV=nRT for precursor body of Nano tube solid powder and sublimed sulfur
The lower vapour pressure 80kpa of degree is calculated, i.e., wherein, P is 80kpa, and V is the volume of ampoule bottle, and R is constant, and T is reaction temperature, and n is to rise
The amount of magnificent sulfur material) it is added in ampoule bottle, after ampoule bottle is purged several times repeatedly with nitrogen, carried out under vacuumized conditions close
Envelope, the ampoule bottle after sealing is placed in Muffle furnace, is reacted 2 hours at 400 DEG C；Resulting production will be reacted in ampoule bottle
Thing CS2Multiple washing is centrifuged repeatedly with ethanol, then the product after washing is dried in vacuo 9 hours at 50 DEG C, is vulcanized
FeS afterwards2Nanotube.
Embodiment 4
As SDBS and FeCl3·6H2O mol ratio is 1:3.5, NaOH and FeCl3·6H2O mol ratio is 2.6:When 1,
0.4075g SDBS, 1.1048 FeCl is weighed respectively3·6H2O and 0.4256g NaOH is standby；The SDBS weighed is matched somebody with somebody
It is set to the SDBS solution that concentration is 0.02mol/L；By the FeCl weighed3·6H2O is configured to the FeCl that concentration is 0.4mol/L3
Solution；The NaOH weighed is configured to the NaOH solution that concentration is 2mol/L.
At 60 DEG C, obtained FeCl will be instilled in obtained SDBS solution while stirring3Solution, is then proceeded to
Uniform stirring 10min, obtains mixed solution A at 60 DEG C4；Continue under 60 DEG C of stirring conditions, by mixed solution A4In while stirring
Obtained NaOH solution is added dropwise, then proceedes to the uniform stirring 30min at 60 DEG C, obtains reaction solution B4。
By reaction solution B4It is put into reactor, then the hydro-thermal process 12h at 180 DEG C is carried out hydro-thermal reaction product
Centrifuge, and repeatedly washed with deionized water and ethanol successively, be then placed in baking oven and dry, then roasting 2 is small at 500 DEG C
When, obtain Fe2O3Precursor body of Nano tube solid powder.
By Fe2O3(addition of sublimed sulfur is warm by reaction according to PV=nRT for precursor body of Nano tube solid powder and sublimed sulfur
The lower vapour pressure 80kpa of degree is calculated, i.e., wherein, P is 80kpa, and V is the volume of ampoule bottle, and R is constant, and T is reaction temperature, and n is to rise
The amount of magnificent sulfur material) it is added in ampoule bottle, after ampoule bottle is purged several times repeatedly with nitrogen, carried out under vacuumized conditions close
Envelope, the ampoule bottle after sealing is placed in Muffle furnace, is reacted 2 hours at 400 DEG C；Resulting production will be reacted in ampoule bottle
Thing CS2Multiple washing is centrifuged repeatedly with ethanol, then the product after washing is dried in vacuo 9 hours at 50 DEG C, is vulcanized
FeS afterwards2Nanotube.
Embodiment 5
As SDBS and FeCl3·6H2O mol ratio is 1:3.4, NaOH and FeCl3·6H2O mol ratio is 2.5:When 1,
0.4043g SDBS, 1.0647g FeCl are weighed respectively3·6H2O and 0.3945g NaOH is standby；The SDBS weighed is matched somebody with somebody
It is set to the SDBS solution that concentration is 0.02mol/L；By the FeCl weighed3·6H2O is configured to the FeCl that concentration is 0.4mol/L3
Solution；The NaOH weighed is configured to the NaOH solution that concentration is 2mol/L.
At 60 DEG C, obtained FeCl will be instilled in obtained SDBS solution while stirring3Solution, is then proceeded to
Uniform stirring 10min, obtains mixed solution A at 60 DEG C5；Continue under 60 DEG C of stirring conditions, by mixed solution A5In while stirring
Obtained NaOH solution is added dropwise, then proceedes to the uniform stirring 30min at 60 DEG C, obtains reaction solution B5。
By reaction solution B5It is put into reactor, then the hydro-thermal process 12h at 180 DEG C is carried out hydro-thermal reaction product
Centrifuge, and repeatedly washed with deionized water and ethanol successively, be then placed in baking oven and dry, then roasting 2 is small at 500 DEG C
When, obtain Fe2O3Precursor body of Nano tube solid powder, its SEM testing result is as shown in Figure 1.
By Fe2O3(addition of sublimed sulfur is warm by reaction according to PV=nRT for precursor body of Nano tube solid powder and sublimed sulfur
The lower vapour pressure 80kpa of degree is calculated, i.e., wherein, P is 80kpa, and V is the volume of ampoule bottle, and R is constant, and T is reaction temperature, and n is to rise
The amount of magnificent sulfur material) it is added in ampoule bottle, after ampoule bottle is purged several times repeatedly with nitrogen, carried out under vacuumized conditions close
Envelope, the ampoule bottle after sealing is placed in Muffle furnace, is reacted 2 hours at 400 DEG C；Resulting production will be reacted in ampoule bottle
Thing CS2Multiple washing is centrifuged repeatedly with ethanol, then the product after washing is dried in vacuo 9 hours at 50 DEG C, that is, obtains sulphur
FeS after change2Nanotube, as shown in Figure 2, its XRD testing result is as shown in Figure 3 for its SEM testing result.
Certainly, described above is not limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made in the essential scope of the present invention, should also belong to the present invention's
Protection domain.
Claims (3)
1. a kind of coal liquefaction FeS2The preparation method of nano tube catalyst, it is characterised in that comprise the following steps：
(1) respectively by SDBS, FeCl3·6H2O and NaOH are configured to the SDBS solution that concentration is 0.02mol/L, concentration
0.4mol/L FeCl3Solution and the NaOH solution that concentration is 2mol/L, wherein SDBS and FeCl3·6H2O mol ratio is 1：
(3.3~3.5), NaOH and FeCl3·6H2O mol ratio is (2.4~2.6)：1；
(2) at 60 DEG C, obtained FeCl will be instilled in obtained SDBS solution while stirring3Solution, is then proceeded to 60
Uniform stirring 10min at DEG C, obtains mixed solution A；
(3) at 60 DEG C, obtained NaOH solution will be instilled in mixed solution A obtained by step (2) while stirring, then proceeded to
The uniform stirring 30min at 60 DEG C, obtains reaction solution B；
(4) the reaction solution B obtained by step (3) is put into reactor, the hydro-thermal process 12h at 180 DEG C；
(5) product obtained by step (4) is centrifuged, and repeatedly washed with deionized water and ethanol successively, Ran Houfang
Enter in baking oven and dry, then be calcined 2 hours at 500 DEG C, obtain Fe2O3Precursor body of Nano tube solid powder；
(6) by Fe2O3Precursor body of Nano tube solid powder and sublimed sulfur are added in ampoule bottle, the addition root of the sublimed sulfur
Calculated according to PV=nRT, wherein P is 80kpa, V is the volume of ampoule bottle, and R is constant, and T is reaction temperature, and n is distillation sulfur material
Amount, after ampoule bottle is purged several times repeatedly with nitrogen, sealed under vacuumized conditions, by after sealing ampoule bottle place
In Muffle furnace, reacted 1~3 hour at 400 DEG C；
(7) by step (6) products therefrom CS2Be centrifuged repeatedly multiple washing with ethanol, then by the product after washing at 50 DEG C it is true
Sky is dried 8~10 hours, that is, obtains FeS2Nanotube.
2. a kind of coal liquefaction FeS according to claim 12The preparation method of nano tube catalyst, it is characterised in that institute
State SDBS and FeCl3·6H2O mol ratio is 1：3.4.
3. a kind of coal liquefaction FeS according to claim 1 or 22The preparation method of nano tube catalyst, it is characterised in that
The NaOH and FeCl3·6H2O mol ratio is 2.5：1.
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