CN106390998A - Nanometer titania based composite catalyst and preparation method thereof - Google Patents
Nanometer titania based composite catalyst and preparation method thereof Download PDFInfo
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- CN106390998A CN106390998A CN201610768891.4A CN201610768891A CN106390998A CN 106390998 A CN106390998 A CN 106390998A CN 201610768891 A CN201610768891 A CN 201610768891A CN 106390998 A CN106390998 A CN 106390998A
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/42—Platinum
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/44—Palladium
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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
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
Abstract
The invention provides a nanometer titania based composite catalyst, which comprises a base material and a composite catalyst layer arranged on the base material, wherein materials of the composite catalyst layer comprise nanometer titania particles and metal catalysts cladded on the surfaces of the nanometer titania particles. According to the nanometer titania based composite catalyst provided by the invention, in the composite catalyst layer, the metal catalysts are cladded on the surfaces of the nanometer titania particles, and the specific surface area of the nanometer titania particles is larger, so that the metal catalysts can be dispersed more uniformly, the surface area of the metal catalyst in unit volume is increased, and the catalytic activity of the catalyst is improved. Meanwhile, the usage amount of the metal catalyst can be saved, and the use cost of the catalyst is reduced. The invention also provides a preparation method of the nanometer titania based composite catalyst. The preparation method is simple and easy to operate, and the prepared nanometer titania based composite catalyst has higher catalytic activity.
Description
Technical field
The present invention relates to catalyst field is and in particular to a kind of nm TiO 2-base composite catalyst and its preparation side
Method.
Background technology
Catalysis burning refers to the catalytic action using catalyst, makes fuel realize at a lower temperature burning completely, this
Have to improving the aspects such as combustion process, the formation of reduction reaction temperature, promotion burning completely and suppression poisonous and harmful substance
Extremely important effect.Therefore, the method is widely used in the numerous areas such as commercial production and daily life.
The catalyst of catalysis burning is usually honeycomb ceramic type structure, that is, adopt ceramic honey comb as matrix supported catalyst
Active component.But all smaller (the about 1m of specific surface area of usual ceramic honey comb2/ g), it is not enough to the activity of dispersed catalyst
Component, this will lead to the catalysis activity of catalyst to substantially reduce.
Therefore, in order that catalyst activity component can be evenly distributed and have preferable catalytic performance it is necessary to provide
A kind of new catalyst.
Content of the invention
For solving the above problems, the invention provides a kind of nm TiO 2-base composite catalyst, wherein, metal catalytic
Agent is coated on titanium dioxide nanoparticle surface, because the specific surface area of titanium dioxide nanoparticle is larger, metal is urged
Agent is coated on titanium dioxide nanoparticle surface, and metallic catalyst can be made to disperse the catalysis evenly improving catalyst to live
Property.
First aspect present invention provides a kind of nm TiO 2-base composite catalyst, including base material and be arranged on institute
State the recombination catalyst layer on base material, the material of described recombination catalyst layer includes titanium dioxide nanoparticle and is coated on institute
State the metallic catalyst on titanium dioxide nanoparticle surface.
Wherein, the particle diameter of described titanium dioxide nanoparticle is 2 nanometers -50 nanometers.
Wherein, described metallic catalyst includes the mixture of noble metal or noble metal and rare earth metal composition.
Wherein, the percetage by weight that described metallic catalyst accounts for described recombination catalyst layer is 1%-20%.
Wherein, the thickness of described recombination catalyst layer is 10 nanometers -500 nanometers.
Wherein, described nm TiO 2-base composite catalyst also includes porous nano titanium dioxide transition zone, described many
Hole nanometer titanium dioxide ti interlayer is between described base material and described recombination catalyst layer.
Wherein, the porous aperture of described porous nano titanium dioxide transition film layer is 2 nanometers -100 nanometers, and described porous is received
The material of rice titanium dioxide transition film layer includes the titanium dioxide granule that particle diameter is 2 nanometers -50 nanometers.
Wherein, the thickness of described nanometer titanium dioxide ti interlayer is 10 nanometers -1000 nanometers.
The nm TiO 2-base composite catalyst that first aspect present invention provides, including base material and be arranged on described base
Recombination catalyst layer on material, in recombination catalyst layer, metallic catalyst is coated on titanium dioxide nanoparticle surface, by
Larger in the specific surface area of titanium dioxide nanoparticle, metallic catalyst is coated on titanium dioxide nanoparticle surface, permissible
Make metallic catalyst disperse evenly to make the surface area of the metallic catalyst in unit volume increase, improve the catalysis of catalyst
Activity.Meanwhile, the usage amount of metallic catalyst can be saved, reduce the use cost of catalyst.
Second aspect present invention provides a kind of preparation method of nm TiO 2-base composite catalyst, including：
Nano titanic oxide sol containing titanium dioxide nanoparticle or dispersion are mixed with metal salt solution, stirring
After uniformly, obtain mixed solution, with mixed solution 30min-2h described in ultraviolet light, make the metal in described metal salt solution
Ion is reduced formation metallic catalyst simple substance, and described metallic catalyst simple substance is deposited on the table of described titanium dioxide nanoparticle
Face forms composite catalyst, thus obtaining the solution containing composite catalyst；
By the described solution dip-coating containing composite catalyst or be sprayed into substrate surface, then it is dried at 150-200 DEG C,
Form recombination catalyst layer in described substrate surface, thus obtaining nm TiO 2-base composite catalyst；Described nano-silica
Change titanio composite catalyst and include base material and setting recombination catalyst layer on the substrate, described recombination catalyst layer
The metallic catalyst that material includes titanium dioxide nanoparticle and is coated on described titanium dioxide nanoparticle surface.
Wherein, first porous nano titanium dioxide transition zone is set in described substrate surface, then again will described containing being combined
The solution dip-coating of catalyst or be sprayed into the substrate surface being provided with porous nano titanium dioxide transition zone, obtains nano titanium oxide
Based composite catalyst, concrete grammar is：
First by the nano titanic oxide sol containing titanium dioxide nanoparticle or dispersion dip-coating or be sprayed into described base
Material surface, is dried at 150-200 DEG C, obtains the base material that surface is provided with porous nano titanium dioxide transition zone, then by institute
The surface stated the solution dip-coating containing composite catalyst or be sprayed into described porous nano titanium dioxide transition zone, in 150-200
Being dried at DEG C, described porous nano titanium dioxide transition zone forming recombination catalyst layer, thus obtaining nano titanium oxide
Based composite catalyst；Described nm TiO 2-base composite catalyst includes base material, setting porous nano on the substrate
Titanium dioxide transition zone and be arranged on the recombination catalyst layer on described porous nano titanium dioxide transition zone.
The preparation method of the nm TiO 2-base composite catalyst that second aspect present invention provides is simple to operation, is obtained
Nm TiO 2-base composite catalyst catalysis activity stronger.
To sum up, beneficial effect of the present invention includes the following aspects：
1st, the nm TiO 2-base composite catalyst that the present invention provides, in recombination catalyst layer, metallic catalyst is cladding
On titanium dioxide nanoparticle surface, because the specific surface area of titanium dioxide nanoparticle is larger, metallic catalyst is coated
On titanium dioxide nanoparticle surface, metallic catalyst can be made to disperse evenly, to make metallic catalyst in unit volume
Surface area increases, and improves the catalysis activity of catalyst.Meanwhile, the usage amount of metallic catalyst can be saved, reduce catalyst
Use cost.
2nd, the preparation method of the nm TiO 2-base composite catalyst that the present invention provides nanometer simple to operation, prepared
Titanium dioxide based composite catalyst catalysis activity is stronger.
Brief description
Fig. 1 is the transmission electron microscope picture of the porous nano titanium dioxide transition zone that the embodiment of the present invention 1 is obtained.
Specific embodiment
Described below is the preferred embodiment of the present invention it is noted that for those skilled in the art
For, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as
Protection scope of the present invention.
First aspect present invention provides a kind of nm TiO 2-base composite catalyst, including base material and be arranged on base
Recombination catalyst layer on material, the material of recombination catalyst layer includes titanium dioxide nanoparticle and is coated on nanometer titanium dioxide
The metallic catalyst of titanium particle surface.
In an embodiment of the present invention, base material is ceramic honey comb, porous ceramic particles, honeycomb or wire netting.
In an embodiment of the present invention, ceramic honey comb is one kind of cordierite, mullite or aluminium titanates.
In an embodiment of the present invention, the conventional selection of industry is chosen as to the pore size of base material, here does not do special limit
Fixed.
In an embodiment of the present invention, the particle diameter of titanium dioxide nanoparticle is 2 nanometers -50 nanometers.
In an embodiment of the present invention, the particle diameter of metallic catalyst is less than the particle diameter of titanium dioxide nanoparticle.
In the present invention one preferred implementation, the particle diameter of metal catalyst particles is 1-10 nanometer.
In an embodiment of the present invention, the thickness being coated on the metallic catalyst on titanium dioxide nanoparticle surface is received for 5
- 10 nanometers of rice.
In an embodiment of the present invention, metallic catalyst includes the mixing of noble metal or noble metal and rare earth metal composition
Thing.
In an embodiment of the present invention, noble metal is palladium or platinum.
In an embodiment of the present invention, rare earth metal selected from cerium or dysprosium.
In an embodiment of the present invention, when the mixture that metallic catalyst is formed with rare earth metal for noble metal, your gold
Belong to and the mol ratio of rare earth metal is 100:1-10:1.
In an embodiment of the present invention, the percetage by weight that metallic catalyst accounts for recombination catalyst layer is 1%-20%.
In the present invention one preferred implementation, the percetage by weight that metallic catalyst accounts for recombination catalyst layer is 5%-
10%.
In an embodiment of the present invention, the thickness of recombination catalyst layer is 10 nanometers -500 nanometers.
In the present invention one preferred implementation, the thickness of recombination catalyst layer is 50 nanometers -100 nanometers.
In the present invention one preferred implementation, recombination catalyst layer is loose structure, porous aperture in recombination catalyst layer
For 2 nanometers -100 nanometers.
In an embodiment of the present invention, the specific surface area of recombination catalyst layer is 100-500m2/g.
In an embodiment of the present invention, nm TiO 2-base composite catalyst also includes porous nano titanium dioxide transition
Layer, porous nano titanium dioxide transition zone is between base material and recombination catalyst layer.
In an embodiment of the present invention, the porous aperture of porous nano titanium dioxide transition film layer is 2 nanometers -100 nanometers,
The material of porous nano titanium dioxide transition film layer includes the titanium dioxide granule that particle diameter is 2 nanometers -50 nanometers.
In an embodiment of the present invention, the thickness of nanometer titanium dioxide ti interlayer is 10 nanometers -1000 nanometers.
In the present invention one preferred implementation, the thickness of nanometer titanium dioxide ti interlayer is 100 nanometers -300 nanometers.
In an embodiment of the present invention, the specific surface area of nanometer titanium dioxide ti interlayer is 50-500m2/g.
The present invention is additionally provided with porous nano titanium dioxide transition zone on base material, and porous nano titanium dioxide transition zone is
It is made up of nano level titanium dioxide granule, porous nano titanium dioxide transition film layer also includes nano level hole, therefore,
The specific surface area of porous nano titanium dioxide transition film layer is larger, and the effective catalytic surface that can expand base material amasss, simultaneously permissible
Dispersed metal catalytic element.Additionally, nanometer titanium dioxide ti interlayer heat stability is stronger, it is urged with base material and with compound
The binding ability of agent layer is all relatively strong, can play the effect of rugged catalyst.
The nm TiO 2-base composite catalyst that first aspect present invention provides, including base material and be arranged on base material
Recombination catalyst layer, in recombination catalyst layer, metallic catalyst is coated on titanium dioxide nanoparticle surface, due to receiving
The specific surface area of rice titanium dioxide granule is larger, metallic catalyst is coated on titanium dioxide nanoparticle surface, can make gold
Metal catalyst disperses evenly to make the surface area of the metallic catalyst in unit volume increase, and improves the catalysis activity of catalyst.
Meanwhile, the usage amount of metallic catalyst can be saved, reduce the use cost of catalyst.
Second aspect present invention provides a kind of preparation method of nano titania based composite catalyst, including：
Nano titanic oxide sol containing titanium dioxide nanoparticle or dispersion are mixed with metal salt solution, stirring
After uniformly, obtain mixed solution, with ultraviolet light mixed solution 30min-2h, so that the metal ion in metal salt solution is gone back
Original shape becomes metallic catalyst simple substance, and the surface that metallic catalyst simple substance is deposited on titanium dioxide nanoparticle forms composite catalyzing
Agent, thus obtain the solution containing composite catalyst；
By the solution dip-coating containing composite catalyst or be sprayed into substrate surface, then it is dried at 150-200 DEG C, in base
Material surface forms recombination catalyst layer, thus obtaining nm TiO 2-base composite catalyst；Nm TiO 2-base is combined and urges
Agent includes base material and is arranged on recombination catalyst layer on base material, and the material of recombination catalyst layer includes nano titanium oxide
Granule and the metallic catalyst being coated on titanium dioxide nanoparticle surface.
In an embodiment of the present invention, the nano titanic oxide sol of titanium dioxide nanoparticle or the preparation side of dispersion
Method is that industry is conventional to be selected, and such as selects Study on Synthesis of Nanocrystal Titanium Dionide colloidal sol.
In an embodiment of the present invention, in nano titanic oxide sol or dispersion, the mass concentration of nano titanium oxide
For 1%-5%.
In an embodiment of the present invention, in metal salt solution, the mass concentration of slaine is 0.05%-0.5%.
In the present invention one preferred implementation, precious metal salt solution includes palladium salt aqueous solution or platinum salt aqueous solution.
In an embodiment of the present invention, the aqueous solution of metal ion also includes rare earth ion.
In an embodiment of the present invention, rare earth metal selected from cerium or dysprosium.
In an embodiment of the present invention, when the mixture that metallic catalyst is formed with rare earth metal for noble metal, your gold
Belong to and the mol ratio of rare earth metal is 100:1-10:1.
In an embodiment of the present invention, in mixed solution, nano titanium oxide is 10 with the mass ratio of metal ion:1-
100:1.
In an embodiment of the present invention, ultraviolet light intensity is 1-100 watt/square metre.
The present invention using ultraviolet light mixed solution thus there occurs photochemical reaction, by the use of nano titanium oxide as
Photochemically reactive derivant, occurs photoreduction to make metal ion be reduced formation metal on nano titanium oxide surface and urges
Agent simple substance, the surface that metallic catalyst simple substance is deposited on titanium dioxide nanoparticle forms composite catalyst, thus being contained
There is the solution of composite catalyst.Composite catalyst is prepared using the method for ultraviolet light, method is simple to operation.
In an embodiment of the present invention, by the solution dip-coating containing composite catalyst or be sprayed into substrate surface, dip-coating or
The time of spraying is 1-30 minute.
In an embodiment of the present invention, the number of times of dip-coating or spraying can be multiple, and concrete number of times can be urged according to compound
The thickness of agent carries out specifically chosen.
In the present invention one preferred implementation, the number of times of dip-coating or spraying is 1-3 time.
In an embodiment of the present invention, first porous nano titanium dioxide transition zone is set in substrate surface, then will contain again
There is the solution dip-coating of composite catalyst or be sprayed into the substrate surface being provided with porous nano titanium dioxide transition zone, obtain nanometer two
Titania based composite catalyst, concrete grammar is：
First by the nano titanic oxide sol containing titanium dioxide nanoparticle or dispersion dip-coating or be sprayed into base material table
Face, is then dried at 150-200 DEG C, obtains the base material that surface is provided with porous nano titanium dioxide transition zone, then will contain
There are the solution dip-coating of composite catalyst or the surface being sprayed into porous nano titanium dioxide transition zone, be dried at 150-200 DEG C,
Porous nano titanium dioxide transition zone forms recombination catalyst layer, thus obtaining nm TiO 2-base composite catalyst；
Nm TiO 2-base composite catalyst includes base material, the porous nano titanium dioxide transition zone being arranged on base material and setting
Recombination catalyst layer on porous nano titanium dioxide transition zone.
In an embodiment of the present invention, the time of dip-coating or spraying is 1-30 minute.
In an embodiment of the present invention, the number of times of dip-coating or spraying can be multiple, and the number of times of concrete dip-coating or spraying can
Carried out specifically chosen with the thickness according to composite catalyst.
In the present invention one preferred implementation, the number of times of dip-coating or spraying is 1-3 time.
The preparation method nm TiO 2-base composite catalyst simple to operation, prepared that second aspect present invention provides
Catalysis activity is stronger.
Embodiment 1：
A kind of preparation method of nm TiO 2-base composite catalyst, including：
The mass concentration nano titanic oxide sol being 5% and the chloroplatinic acid aqueous solution that mass concentration is 0.05% are mixed
Close, after stirring, obtain mixed solution, with ultraviolet light mixed solution 30min, ultraviolet light intensity is 100 watts/flat
Square rice, makes platinum ion be reduced formation platinum simple substance, the surface that platinum simple substance is deposited on titanium dioxide nanoparticle forms composite catalyzing
Agent, thus obtain the solution containing composite catalyst；
By the solution dip-coating containing composite catalyst to ceramic honey comb surface, time of immersion is 1 minute, then at 200 DEG C
Lower drying, forming thickness on ceramic honey comb surface is 10 nano-composite catalyst layers, and metallic catalyst accounts for recombination catalyst layer
Percetage by weight is 1%, thus obtaining nm TiO 2-base composite catalyst；Nm TiO 2-base composite catalyst includes
Base material and be arranged on recombination catalyst layer on ceramic honey comb, the material of recombination catalyst layer includes titanium dioxide nanoparticle
And it is coated on the metal platinum on titanium dioxide nanoparticle surface.
After tested, in the recombination catalyst layer that the embodiment of the present invention 1 is obtained, the particle diameter of titanium dioxide nanoparticle is 2 nanometers
Left and right, the particle diameter of metal platinum is 1 ran.
Embodiment 2：
A kind of preparation method of nm TiO 2-base composite catalyst, including：
The nano titanic oxide sol that mass concentration is 1% is mixed with the palladium nitrate aqueous solution that mass concentration is 0.2%,
After stirring, obtain mixed solution, with ultraviolet light mixed solution 2h, ultraviolet light intensity is 50 watts/square metre, makes
Palladium ion is reduced formation palladium simple substance, and the surface that palladium simple substance is deposited on titanium dioxide nanoparticle forms composite catalyst, thus
Obtain the solution containing composite catalyst；
By the solution dip-coating containing composite catalyst to metal net surface, time of immersion is 30 minutes, then at 200 DEG C
It is dried, forming thickness in metal net surface is 500 nano-composite catalyst layers, and metallic catalyst accounts for the weight of recombination catalyst layer
Percent is 20%, thus obtaining nm TiO 2-base composite catalyst；Nm TiO 2-base composite catalyst includes base
Material and be arranged on recombination catalyst layer on wire netting, the material of recombination catalyst layer include titanium dioxide nanoparticle and
It is coated on the Metal Palladium on titanium dioxide nanoparticle surface.
After tested, in the recombination catalyst layer that the embodiment of the present invention 2 is obtained, the particle diameter of titanium dioxide nanoparticle is received for 50
About rice, the particle diameter of metal platinum is 10 ran.
Embodiment 3：
A kind of preparation method of nm TiO 2-base composite catalyst, including：
The nano titanic oxide sol that mass concentration is 3% is mixed with the palladium nitrate aqueous solution that mass concentration is 0.3%,
After stirring, obtain mixed solution, with ultraviolet light mixed solution 1h, ultraviolet light intensity is 100 watts/square metre,
Palladium ion is made to be reduced formation palladium simple substance, the surface that palladium simple substance is deposited on titanium dioxide nanoparticle forms composite catalyst, from
And obtain the solution containing composite catalyst；
By the solution spraying containing composite catalyst to honeycomb surface, spray time is 30 minutes, then at 150 DEG C
Lower drying, forming thickness on honeycomb surface is 100 nano-composite catalyst layers, and metallic catalyst accounts for recombination catalyst layer
Percetage by weight is 10%, thus obtaining nm TiO 2-base composite catalyst；Nm TiO 2-base composite catalyst bag
Include base material and be arranged on recombination catalyst layer on honeycomb, the material of recombination catalyst layer includes nano titanium oxide
Grain and the Metal Palladium being coated on titanium dioxide nanoparticle surface.
After tested, in the recombination catalyst layer that the embodiment of the present invention 3 is obtained, the particle diameter of titanium dioxide nanoparticle is received for 30
About rice, the particle diameter of metal platinum is 5 ran.
Embodiment 4：
A kind of preparation method of nm TiO 2-base composite catalyst, including：
Mass concentration is that 2% nano titanic oxide sol containing titanium dioxide nanoparticle is sprayed into metal netlist
Face, spray time is 10 minutes, is dried, obtains the metal that surface is provided with porous nano titanium dioxide transition zone at 200 DEG C
Net；The thickness of porous nano titanium dioxide transition zone is 100 nanometers；
The nano titanic oxide sol that mass concentration is 1% is mixed with the palladium nitrate aqueous solution that mass concentration is 0.1%,
After stirring, obtain mixed solution, with ultraviolet light mixed solution 1h, ultraviolet light intensity is 100 watts/square metre,
Palladium ion is made to be reduced formation palladium simple substance, the surface that palladium simple substance is deposited on titanium dioxide nanoparticle forms composite catalyst, from
And obtain the solution containing composite catalyst；
By the solution dip-coating containing composite catalyst to porous nano titanium oxide transition film surface, time of immersion is 2
Minute, then it is dried at 200 DEG C, forming thickness in porous nano titanium dioxide transition film surface is that 10 nanometers compound is urged
Agent layer, the percetage by weight that metallic catalyst accounts for recombination catalyst layer is 5%, urges thus obtaining nm TiO 2-base and being combined
Agent；Nm TiO 2-base composite catalyst include base material, the porous nano titanium dioxide transition zone being arranged on base material with
And it is arranged on the recombination catalyst layer on porous nano titanium dioxide transition zone.
Fig. 1 is the transmission electron microscope picture of the porous nano titanium dioxide transition zone that the embodiment of the present invention 1 is obtained；Can from Fig. 1
To find out, there are in porous nano titanium dioxide transition zone pore space structure, the porous of porous nano titanium dioxide transition film layer
Footpath is 15 ran, and the material of porous nano titanium dioxide transition film layer also includes the titanium dioxide that particle diameter is 20 ran
Granule.
After tested, in the recombination catalyst layer that the embodiment of the present invention 2 is obtained, the particle diameter of titanium dioxide nanoparticle is received for 30
About rice, the particle diameter of metal platinum is 10 ran.
Embodiment 5：
A kind of preparation method of nm TiO 2-base composite catalyst, including：
Mass concentration is that 5% nano titanic oxide sol containing titanium dioxide nanoparticle is sprayed into metal netlist
Face, spray time is 15 minutes, is dried, obtains the metal that surface is provided with porous nano titanium dioxide transition zone at 150 DEG C
Net；The thickness of porous nano titanium dioxide transition zone is 300 nanometers；
The nano titanic oxide sol that mass concentration is 2% is mixed with the palladium nitrate aqueous solution that mass concentration is 0.1%,
After stirring, obtain mixed solution, with ultraviolet light mixed solution 1h, ultraviolet light intensity is 20 watts/square metre, makes
Palladium ion is reduced formation palladium simple substance, and the surface that palladium simple substance is deposited on titanium dioxide nanoparticle forms composite catalyst, thus
Obtain the solution containing composite catalyst；
By the solution dip-coating containing composite catalyst to porous nano titanium oxide transition film surface, dip-coating number of times is 3
Secondary, the time of each dip-coating is 5 minutes, is then dried at 200 DEG C, is formed in porous nano titanium dioxide transition film surface
Thickness is 100 nano-composite catalyst layers, and the percetage by weight that metallic catalyst accounts for recombination catalyst layer is 5%, thus obtaining
Nm TiO 2-base composite catalyst；Nm TiO 2-base composite catalyst includes base material, the porous being arranged on base material
Nanometer titanium dioxide ti interlayer and be arranged on the recombination catalyst layer on porous nano titanium dioxide transition zone.
After tested, in the porous nano titanium dioxide transition zone that the embodiment of the present invention 2 is obtained, there is pore space structure, porous is received
The material of rice titanium dioxide transition film layer includes the titanium dioxide granule that particle diameter is 50 nanometers；Porous nano titanium dioxide transition film
The porous aperture of layer is 20 nanometers；
After tested, in the recombination catalyst layer that the embodiment of the present invention 2 is obtained, the particle diameter of titanium dioxide nanoparticle is received for 40
About rice, the particle diameter of metal platinum is 8 ran.
Embodiment described above only have expressed the several embodiments of the present invention, and its description is more concrete and detailed, but simultaneously
Therefore the restriction to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, some deformation can also be made and improve, these broadly fall into the guarantor of the present invention
Shield scope.Therefore, the protection domain of patent of the present invention should be defined by claims.
Claims (10)
1. a kind of nm TiO 2-base composite catalyst is it is characterised in that including base material and arranging on the substrate
Recombination catalyst layer, the material of described recombination catalyst layer includes titanium dioxide nanoparticle and is coated on described nano-silica
Change the metallic catalyst of titanium particle surface.
2. nm TiO 2-base composite catalyst as claimed in claim 1 is it is characterised in that described nano titanium oxide
The particle diameter of grain is 2 nanometers -50 nanometers.
3. nm TiO 2-base composite catalyst as claimed in claim 1 is it is characterised in that described metallic catalyst includes
Noble metal or the mixture of noble metal and rare earth metal composition.
4. nm TiO 2-base composite catalyst as claimed in claim 1 is it is characterised in that described metallic catalyst accounts for institute
The percetage by weight stating recombination catalyst layer is 1%-20%.
5. nm TiO 2-base composite catalyst as claimed in claim 1 is it is characterised in that described recombination catalyst layer
Thickness is 10 nanometers -500 nanometers.
6. nm TiO 2-base composite catalyst as claimed in claim 1 is it is characterised in that described nm TiO 2-base
Composite catalyst also includes porous nano titanium dioxide transition zone, and described porous nano titanium dioxide transition zone is between described base material
And described recombination catalyst layer between.
7. nm TiO 2-base composite catalyst as claimed in claim 6 is it is characterised in that described porous nano titanium dioxide
The porous aperture of titanium transition film layer is 2 nanometers -100 nanometers, and the material of described porous nano titanium dioxide transition film layer includes grain
Footpath is 2 nanometers -50 nanometers of titanium dioxide granule.
8. nm TiO 2-base composite catalyst as claimed in claim 6 is it is characterised in that described nano titanium oxide mistake
The thickness crossing layer is 10 nanometers -1000 nanometers.
9. a kind of preparation method of nm TiO 2-base composite catalyst is it is characterised in that include：
Nano titanic oxide sol containing titanium dioxide nanoparticle or dispersion are mixed with metal salt solution, stirs
Afterwards, obtain mixed solution, with mixed solution 30min-2h described in ultraviolet light, make the metal ion in described metal salt solution
It is reduced formation metallic catalyst simple substance, described metallic catalyst simple substance is deposited on the surface shape of described titanium dioxide nanoparticle
Become composite catalyst, thus obtaining the solution containing composite catalyst；
By the described solution dip-coating containing composite catalyst or be sprayed into substrate surface, then it is dried at 150-200 DEG C, in institute
State substrate surface and form recombination catalyst layer, thus obtaining nm TiO 2-base composite catalyst；Described nano titanium oxide
Based composite catalyst includes base material and setting recombination catalyst layer on the substrate, the material of described recombination catalyst layer
Including titanium dioxide nanoparticle and the metallic catalyst that is coated on described titanium dioxide nanoparticle surface.
10. the preparation method of nm TiO 2-base composite catalyst as claimed in claim 9 is it is characterised in that elder generation is in institute
State substrate surface setting porous nano titanium dioxide transition zone, then again by the described solution dip-coating containing composite catalyst or spray
It is applied to the substrate surface being provided with porous nano titanium dioxide transition zone, obtains nm TiO 2-base composite catalyst, specifically side
Method is：
First by the nano titanic oxide sol containing titanium dioxide nanoparticle or dispersion dip-coating or be sprayed into described base material table
Face, is dried at 150-200 DEG C, obtains the base material that surface is provided with porous nano titanium dioxide transition zone, then contain described
There are the solution dip-coating of composite catalyst or the surface being sprayed into described porous nano titanium dioxide transition zone, at 150-200 DEG C
It is dried, described porous nano titanium dioxide transition zone forms recombination catalyst layer, thus it is multiple to obtain nm TiO 2-base
Close catalyst；Described nm TiO 2-base composite catalyst includes base material, setting porous nano dioxy on the substrate
Change ti interlayer and be arranged on the recombination catalyst layer on described porous nano titanium dioxide transition zone.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11173478B2 (en) | 2019-01-25 | 2021-11-16 | Tsinghua University | Photocatalytic structure and method for making the same |
| US11376577B2 (en) | 2019-01-25 | 2022-07-05 | Tsinghua University | Photocatalytic structure and method for making the same |
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| US11376577B2 (en) | 2019-01-25 | 2022-07-05 | Tsinghua University | Photocatalytic structure and method for making the same |
| TWI785199B (en) * | 2019-01-25 | 2022-12-01 | 鴻海精密工業股份有限公司 | A photocatalytic structure and method for making the same |
| US11602741B2 (en) | 2019-01-25 | 2023-03-14 | Tsinghua University | Method for making photocatalytic structure |
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