CN102500367B - Au nanoparticle catalyst and preparation method thereof - Google Patents
Au nanoparticle catalyst and preparation method thereof Download PDFInfo
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- CN102500367B CN102500367B CN 201110300176 CN201110300176A CN102500367B CN 102500367 B CN102500367 B CN 102500367B CN 201110300176 CN201110300176 CN 201110300176 CN 201110300176 A CN201110300176 A CN 201110300176A CN 102500367 B CN102500367 B CN 102500367B
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Abstract
The invention discloses an Au nanoparticle catalyst and a preparation method of the Au nanoparticle catalyst. The active component of the catalyst is Au nanoparticles. The Au nanoparticles with the particle size of 1 to 10 nm are prepared by using nano-interlayer of a layered material with a two-dimensional Si structure as reaction space and using chloroauric acid as host material. The interlayer group and the space of the layered material with the two-dimensional Si structure can ensure small particle size and uniform distribution of the Au nanoparticles growing in the space, and can effectively inhibit further growth or agglomeration of the Au nanoparticle catalyst when in use. The catalyst contains 0.2wt% to 4.0wt% of Au nanoparticles. The catalyst prepared by the invention has high reaction activity for CO oxidation at low temperature, can be easily recovered after catalytic reaction, and has the advantages of high stability and durability.
Description
Technical field
The present invention relates to a kind of Au catalyst, especially relate to a kind of method for preparing the golden nanometer particle catalyst between nanometer layer of take two-dimentional silicon structure stratified material as reaction compartment, with a kind of golden nanometer particle catalyst obtained by this method, this catalyst can be used for eliminating carbon monoxide.
Background technology
Along with social progress, the discharge capacity of CO increases year by year, and it has become airborne lifetime killer such as the major pollutants of many environment, particularly scene of fire, mine etc.CO is inflammable, explosive, the harmful gas pollutant of a kind of colorless and odorless, can be combined by the hemoglobin in human body, thereby stops hemoglobin to transport oxygen to human organ.CO reaches 10ppm in air will be harmful, and therefore how removing the CO pollution is one of focus of society research.
In recent years, automobile exhaust pollution has become the first pollution sources in atmosphere pollution.In atmosphere pollution, the pollution that motor vehicle exhaust emission causes accounts for the 60%-70% of atmosphere pollution, statistics according to the study, in the seventies, the whole world is 3.59 hundred million tons as the total amount to the carbon monoxide of airborne release between man-made pollution source 1 year, and wherein the carbon monoxide by motor vehicle emission is 2.25 hundred million tons, accounts for 63% of carbon monoxide total amount, as can be seen here, the oxidation reaction of CO is to eliminate especially one of the important reaction of purifying vehicle exhaust of air pollution.Traditional C O oxidation be catalyst activity component Ru, Pt, Pd, Rh even load on metal oxide carrier, although CO is had to good catalytic activity, but its reaction temperature needed is very high, at room temperature to gas mask, indoor air purification etc., can not play useful effect.(Sherif Moussa, et.al., the Chem.Phys.Lett. such as Moussa, 2011,510,179-184) with laser irradiation supporting Pt, Pd, CoO and Pd-CoO nano particle on Graphene, active best Pd-CoO nano particle CO complete oxidation also will be at 195 ℃.The Au catalyst that metal oxide supports is the optional catalyst of CO low temperature elimination, but it is selectively lower.Yu etc. (Yeon-Tae Yu, et.al., Sens.Actuators, B, 2011,157,444-449) use microwave method and the precipitation method at SnO
2the area load golden nanometer particle forms nucleocapsid structure, and to the CO oxidation, lower than 100 ℃, but the catalyst precarsor of preparation can impel gold nano grain to assemble growth 300～600 ℃ of calcinings, has shortened service life.Wang etc. (Xiaohong Wang, et.al., Environ.Chem.Lett., 2011,9,185-189) golden nanometer particle is loaded on to Al
2o
3the catalyst of upper preparation can make CO at 0 ℃ of complete oxidation under lower temperature even, but this catalyst stability is poor, and they attempt by adding Rh to improve the stability of its catalyst, but after its catalytic reaction, the size of nano particle enlarges markedly.The golden nanometer particle catalyst of high dispersive has very high catalytic activity for the carbon monoxide under low temperature complete oxidation, at purifying vehicle exhaust, fuel cell unstripped gas purifying, indoor air purification, CO
2a lot of aspects such as laser gas purifying are applied, and the golden nanometer particle catalyst that therefore how to prepare this high dispersive, difficult reunion, good stability remains a challenge.
Summary of the invention
The object of the present invention is to provide a kind of golden nanometer particle method for preparing catalyst, a kind of golden nanometer particle catalyst obtained by this method also is provided, utilize the size of the special interlayer effect control golden nanometer particle of two-dimentional silicon structure stratified material, and suppress its reunion, under this catalyst low temperature, to CO, oxidation has higher reactivity, and after catalytic reaction, catalyst is easy to recycling, catalyst stability is good, and durability is strong.
The technical scheme that the present invention adopted for achieving the above object is:
A kind of preparation method of golden nanometer particle catalyst, it comprises the following steps:
(1) will evenly spread to the silane compound of amido functional group in the aqueous surfactant solution that mass percent is 8～18wt%, making this mass percent with the silane compound of amido functional group is 5～15wt%, regulate and make the pH value of this mixed solution between 2～4 with diluted acid again, and after 1～50 ℃ of water bath with thermostatic control reaction 18～72h, this mixed solution is carried out to centrifugal, filtration, carry out the several times washing with deionized water and absolute ethyl alcohol, obtain having the two-dimentional silicon structure stratified material of amido functional group after vacuum drying 12～48h;
(2) this two dimension silicon structure stratified material is joined in absolute ethyl alcohol, and carry out ultrasonic this two dimension silicon structure stratified material that makes and be distributed in absolute ethyl alcohol fully, form and mix suspension, the mass percent of this two dimension silicon structure stratified material is 0.002～5wt%; Chlorauric acid solution is joined in this mixing suspension, and carry out the ultrasonic chlorauric acid solution that makes and be uniformly dispersed, the mass ratio of this gold chloride and two-dimentional silicon structure stratified material is 1: 10～1: 30; The mixing suspension that again this has been added to chlorauric acid solution is revolved the dry light-yellow precipitate that obtains of evaporate to dryness, then from newly being distributed to ethanol solution;
(3) ascorbic acid solution joined in step (2) in last prepared solution and stirred until this solution is clarified fully, dripping NaBH
4, make ascorbic acid and NaBH in solution
4molal quantity and the molal quantity of gold chloride remain between 4～9, solution is carried out to continuous stirring 2～24h, obtain the suspension of two-dimentional silicon structure stratified material load gold nano particle;
(4) last prepared suspension in step (3) is carried out to centrifugal, filtration, obtain the golden nanometer particle catalyst;
(5) this golden nanometer particle catalyst is carried out to vacuum drying.
The described silane compound with amido functional group is a kind of in 3-TSL 8330, p-aminophenyl trimethoxy silane or APTES, and after this silane hydrolyzate, terminal amino group can match the lamellar compound that formation rule arranges with anion with positive charge.
Described surfactant is a kind of in lauryl sodium sulfate or dodecyl sodium sulfate, can make two-dimentional silicon structure stratified material interlamellar spacing stable.
In described step (3), the mol ratio of this ascorbic acid and NaBH4 is adjustable arbitrarily, by regulating mole speed that recently control is reacted of ascorbic acid and NaBH4.
Described two-dimentional silicon structure stratified material is that interlayer has regularly arranged amino and Anionic Surfactant, and the laminate silicon structure is obtain-Si-O-Si-of hydrolysis, and Stability Analysis of Structures, can be other reactions space is provided.
Described diluted acid is a kind of in hydrochloric acid, sulfuric acid or nitric acid, but the hydrolysis of catalysis silane compound.
Described ascorbic acid is a kind of in L-AA or D-araboascorbic acid.
A kind of by the prepared golden nanometer particle catalyst of aforementioned preparation method, it comprises two-dimentional silicon structure stratified material and golden nanometer particle, this two dimension silicon structure stratified material is the bedded silicon structure compound with regularly arranged amido functional group, this golden nanometer particle is dispersed in the interlayer of this two dimension silicon structure stratified material, the particle diameter of this golden nanometer particle is between 1～10nm, the interlayer group of two dimension silicon structure stratified material and space make gold nanometer particle grain size little and be evenly distributed, and can effectively suppress the golden nanometer particle catalyst and in use further grow up or reunite.
The mass percent of this golden nanometer particle is 0.2～4wt%.
Described two-dimentional silicon structure stratified material is that interlayer has regularly arranged amino and Anionic Surfactant, and the laminate silicon structure is obtain-Si-O-Si-of hydrolysis.
Its reaction mechanism of golden nanometer particle catalyst of the present invention as shown in Figure 1.At first be the ultrasonic dispersion in solution of two-dimentional silicon structure stratified material, because its flaggy is large stretch of, in solution, because swelling action makes interlamellar spacing, increase but can't scatter fully, in solution its laminate two-layer be amino cation; The gold chloride root that joins reaction system, by diffusion and electrostatic attraction effect, enters interlayer, revolves to steam solvent and make this active force stronger later.Reactant again is distributed in solvent and goes, interlayer just has been full of the gold chloride radical ion, along with the gold chloride in-situ reducing that adds of reducing agent ascorbic acid becomes gold atom, form gradually gold nano grain, after the interlayer gold chloride consumes, gold chloride anion in solution can supplement on every side, and constantly reaction is until the gold chloride total overall reaction is complete.The golden nanometer particle growth position is corresponding with the amino cation of laminate, and this makes gold particle have polymolecularity, and Layered-space has limited further growing up of gold nano grain simultaneously.The size of golden nanometer particle can be controlled by concentration and the reaction time of gold chloride root.The present invention can be by regulating reducing agent ascorbic acid and NaBH
4mole recently control the speed of reaction.
Prepared golden nanometer particle is dispersed in the interlayer of two-dimentional silicon structure stratified material, its particle diameter is at 1～10nm, the interlayer group of two dimension silicon structure stratified material and space make gold nanometer particle grain size little and be evenly distributed, and can effectively suppress the golden nanometer particle catalyst and in use further grow up or reunite.
In catalyst, the quality percentage composition of golden nanometer particle is 0.2～4.0wt%, and in this scope, its dispersiveness is better.
Its reaction mechanism of golden nanometer particle catalyst of the present invention as shown in Figure 1.At first be the ultrasonic dispersion in solution of two-dimentional silicon structure stratified material, because its flaggy is large stretch of, in solution, because swelling action makes interlamellar spacing, increase but can't scatter fully, in solution its laminate two-layer be amino cation; The gold chloride root that joins reaction system, by diffusion and electrostatic attraction effect, enters interlayer, revolves to steam solvent and make this active force stronger later.Reactant again is distributed in solvent and goes, interlayer just has been full of the gold chloride radical ion, along with the gold chloride in-situ reducing that adds of reducing agent ascorbic acid becomes gold atom, form gradually gold nano grain, after the interlayer gold chloride consumes, gold chloride anion in solution can supplement on every side, and constantly reaction is until the gold chloride total overall reaction is complete.The golden nanometer particle growth position is corresponding with the amino cation of laminate, and this makes gold particle have polymolecularity, and Layered-space has limited further growing up of gold nano grain simultaneously.The size of golden nanometer particle can be controlled by concentration and the reaction time of gold chloride root.The present invention can be by regulating reducing agent ascorbic acid and NaBH
4mole recently control the speed of reaction.
Compared with prior art, the catalyst that prepared by the present invention has following advantage:
(1) the inventive method obtains the golden nanometer particle catalyst and has good CO catalytic oxidation under low temperature activity;
(2) in the golden nanometer particle catalyst that the present invention makes, gold nanometer particle grain size is little, is evenly distributed;
(3) the golden nanometer particle catalyst performance stabilised that the present invention makes, golden nanometer particle is difficult for reuniting.
Below in conjunction with accompanying drawing and embodiment, the present invention is further described.
The accompanying drawing explanation
Fig. 1 is reaction mechanism figure of the present invention.
The TEM photo of the golden nanometer particle that Fig. 2 is embodiment 1 preparation;
Fig. 3 is the particle diameter distribution map of the golden nanometer particle of embodiment 1 preparation.
The specific embodiment
Embodiment 1: see Fig. 1 to Fig. 3, and the preparation method of a kind of golden nanometer particle catalyst of the present invention, it comprises the following steps:
(1) will evenly spread to the silane compound of amido functional group in the aqueous surfactant solution that mass percent is 8～18wt%, making this mass percent with the silane compound of amido functional group is 5～15wt%, regulate and make the pH value of this mixed solution between 2～4 with diluted acid again, and after 1～50 ℃ of water bath with thermostatic control reaction 18～72h, this mixed solution is carried out to centrifugal, filtration, carry out the several times washing with deionized water and absolute ethyl alcohol, obtain having the two-dimentional silicon structure stratified material of amido functional group after vacuum drying 12～48h;
(2) this two dimension silicon structure stratified material is joined in absolute ethyl alcohol, and carry out ultrasonic this two dimension silicon structure stratified material that makes and be distributed in absolute ethyl alcohol fully, form and mix suspension, the mass percent of this two dimension silicon structure stratified material is between 0.002～5wt%; Chlorauric acid solution is joined in this mixing suspension, and carry out the ultrasonic chlorauric acid solution that makes and be uniformly dispersed, the mass ratio of this gold chloride and two-dimentional silicon structure stratified material is between 1: 10～1: 30; The mixing suspension that again this has been added to chlorauric acid solution is revolved the dry light-yellow precipitate that obtains of evaporate to dryness, then from newly being distributed to ethanol solution;
(3) ascorbic acid solution joined in step (2) in last prepared solution and stirred until this solution is clarified fully, dripping NaBH
4, make ascorbic acid and NaBH in solution
4molal quantity and the molal quantity of gold chloride remain between 4～9, solution is carried out to continuous stirring 2～24h, obtain the suspension of two-dimentional silicon structure stratified material load gold nano particle;
(4) last prepared suspension in step (3) is carried out to centrifugal, filtration, obtain the golden nanometer particle catalyst;
(5) this golden nanometer particle catalyst is carried out to vacuum drying.
The described silane compound with amido functional group is a kind of in 3-TSL 8330, p-aminophenyl trimethoxy silane or APTES.
Described surfactant is a kind of in lauryl sodium sulfate or dodecyl sodium sulfate.
In described step (3), the mol ratio of this ascorbic acid and NaBH4 is adjustable arbitrarily, by regulating mole speed that recently control is reacted of ascorbic acid and NaBH4.
Described two-dimentional silicon structure stratified material is that interlayer has regularly arranged amino and Anionic Surfactant, and the laminate silicon structure is obtain-Si-O-Si-of hydrolysis.
Described diluted acid is a kind of in hydrochloric acid, sulfuric acid or nitric acid.
Described ascorbic acid is a kind of in L-AA or D-araboascorbic acid.
A kind of by the prepared golden nanometer particle catalyst of aforementioned preparation method, it comprises two-dimentional silicon structure stratified material and golden nanometer particle, this two dimension silicon structure stratified material is the bedded silicon structure compound with regularly arranged amido functional group, this golden nanometer particle is dispersed in the interlayer of this two dimension silicon structure stratified material, and the particle diameter of this golden nanometer particle is between 1～10nm.
The mass percent of this golden nanometer particle is 0.2～4wt%.
Described two-dimentional silicon structure stratified material is that interlayer has regularly arranged amino and Anionic Surfactant, and the laminate silicon structure is obtain-Si-O-Si-of hydrolysis.
Its reaction mechanism of golden nanometer particle catalyst of the present invention as shown in Figure 1.At first be the ultrasonic dispersion in solution of two-dimentional silicon structure stratified material, because its flaggy is large stretch of, in solution, because swelling action makes interlamellar spacing, increase but can't scatter fully, in solution its laminate two-layer be amino cation; The gold chloride root that joins reaction system, by diffusion and electrostatic attraction effect, enters interlayer, revolves to steam solvent and make this active force stronger later.Reactant again is distributed in solvent and goes, interlayer just has been full of the gold chloride radical ion, along with the gold chloride in-situ reducing that adds of reducing agent ascorbic acid becomes gold atom, form gradually gold nano grain, after the interlayer gold chloride consumes, gold chloride anion in solution can supplement on every side, and constantly reaction is until the gold chloride total overall reaction is complete.The golden nanometer particle growth position is corresponding with the amino cation of laminate, and this makes gold particle have polymolecularity, and Layered-space has limited further growing up of gold nano grain simultaneously.The size of golden nanometer particle can be controlled by concentration and the reaction time of gold chloride root.The present invention can be by regulating reducing agent ascorbic acid and NaBH
4mole recently control the speed of reaction.
Prepared golden nanometer particle is dispersed in the interlayer of two-dimentional silicon structure stratified material, its particle diameter is at 1～10nm, the interlayer group of two dimension silicon structure stratified material and space make gold nanometer particle grain size little and be evenly distributed, and can effectively suppress the golden nanometer particle catalyst and in use further grow up or reunite.
In catalyst, the quality percentage composition of golden nanometer particle is 0.2～4.0wt%, and in this scope, its dispersiveness is better.
Compared with prior art, the catalyst that prepared by the present invention has following advantage:
(4) the inventive method obtains the golden nanometer particle catalyst and has good CO catalytic oxidation under low temperature activity;
(5) in the golden nanometer particle catalyst that the present invention makes, gold nanometer particle grain size is little, is evenly distributed;
The golden nanometer particle catalyst performance stabilised that the present invention makes, golden nanometer particle is difficult for reuniting.
Embodiment 2: gold nano catalyst of the present embodiment and preparation method thereof is substantially the same manner as Example 1, its difference is: it is in the 12wt% lauryl sodium sulfate aqueous solution that the 3-TSL 8330 is evenly spread to the 30mL mass percent, making its mass percent is 10wt%, regulate the pH value 2.5 with watery hydrochloric acid again, after 40 ℃ of water bath with thermostatic control reaction 24h, centrifugal, filter, with deionized water and absolute ethanol washing several, vacuum drying obtains two-dimentional silicon structure stratified material.
Two-dimentional silicon structure stratified material is distributed in the 80mL absolute ethyl alcohol, and its mass percent is 1.5wt%, and ultrasonic 40min disperses it fully; Chlorauric acid solution is added in two-dimentional silicon structure stratified material ethanolic solution, make the mass ratio 1: 12 of gold chloride and two-dimentional silicon structure stratified material, ultrasonic being uniformly dispersed; Revolve the dry mixed liquor of evaporate to dryness, then add the 80mL absolute ethyl alcohol and stirring to disperseing fully; Drip ascorbic acid solution and be stirred to solution and clarify fully in prepared mixing suspension, then drip NaBH
4solution, make ascorbic acid and NaBH
4molal quantity with the ratio of the molal quantity of gold chloride, be 8 (wherein, ascorbic acid and NaBH
4mol ratio be 1: 3), continue to stir 10h.Product is centrifugal, filtration, washing, vacuum drying, the described catalyst of system, and wherein the quality percentage composition of golden nanometer particle is 1.2wt%.By Fig. 2 and Fig. 3, found out, golden nanometer particle is evenly distributed in the stratified material interlayer, and average grain diameter is at 7.2nm.
Consist of the air Mixture of 2.0%CO at unstripped gas, the gas volume air speed is 3.5 * 10
4mLg
-1h
-1condition under, the minimum response temperature that this catalyst CO transforms fully is-14 ℃; Under-5 ℃ of conditions, catalysis CO transforms at least keep 500h constant fully.
Embodiment 3: gold nano catalyst of the present embodiment and preparation method thereof is basic identical with embodiment 1,2, its difference is: it is in the 9wt% lauryl sodium sulfate aqueous solution that the 3-TSL 8330 is evenly spread to the 25mL mass percent, making its mass percent is 6wt%, regulate the pH value 3 with watery hydrochloric acid again, after 4 ℃ of water bath with thermostatic control reaction 70h, centrifugal, filter, with deionized water and absolute ethanol washing several, vacuum drying obtains two-dimentional silicon structure stratified material.
Two-dimentional silicon structure stratified material is distributed in the 40mL absolute ethyl alcohol, and its mass percent is 0.2wt%, and ultrasonic 1h disperses it fully; Chlorauric acid solution is added in two-dimentional silicon structure stratified material ethanolic solution, and the mass ratio that makes gold chloride and two-dimentional silicon structure stratified material is 1: 19, ultrasonic being uniformly dispersed; Revolve the dry mixed liquor of evaporate to dryness, then add the 40ml absolute ethyl alcohol and stirring to disperseing fully; Directly drip NaBH in prepared mixing suspension
4solution, make NaBH
4with the mol ratio of gold chloride be 8, continue to stir 5h.Product is centrifugal, filtration, washing, vacuum drying, makes described catalyst, and wherein the average grain diameter of golden nanometer particle is at 4.5nm, and mass percentage content is 2.5wt%.
Embodiment 4: gold nano catalyst of the present embodiment and preparation method thereof is basic identical with embodiment 1 to 3, its difference is: it is in the 18wt% lauryl sodium sulfate aqueous solution that the 3-TSL 8330 is evenly spread to the 45mL mass percent, making its mass percent is 15wt%, regulate the pH value 4 with watery hydrochloric acid again, after 50 ℃ of water bath with thermostatic control reaction 72h, centrifugal, filter, with deionized water and absolute ethanol washing several, vacuum drying obtains two-dimentional silicon structure stratified material.
Two-dimentional silicon structure stratified material is distributed in the 1000mL absolute ethyl alcohol, and its mass percent is 5wt%, and ultrasonic 0.5h disperses it fully; Chlorauric acid solution is added in two-dimentional silicon structure stratified material ethanolic solution, and the mass ratio that makes gold chloride and two-dimentional silicon structure stratified material is 1: 30, ultrasonic being uniformly dispersed; Revolve the dry mixed liquor of evaporate to dryness, then add the 1000ml absolute ethyl alcohol and stirring to disperseing fully; Directly drip NaBH in prepared mixing suspension
4solution, make NaBH
4with the mol ratio of gold chloride be 9, continue to stir 24h.Product is centrifugal, filtration, washing, vacuum drying, makes described catalyst, and wherein the average grain diameter of golden nanometer particle is at 10nm, and mass percentage content is 4wt%.
Under appreciation condition with embodiment mono-, the minimum response temperature that this catalyst CO transforms fully is-10 ℃; And, under 10 ℃ of conditions, catalysis CO transforms at least keep 400h constant fully.
As described in the present embodiment of the invention, with the golden nanometer particle Catalysts and its preparation method of the same or similar structure of the present invention, all within protection scope of the present invention.
Claims (9)
1. the preparation method of a golden nanometer particle catalyst, is characterized in that, it comprises the following steps:
(1) will evenly spread to the silane compound of amido functional group in the aqueous surfactant solution that mass percent is 8～18wt%, making this mass percent with the silane compound of amido functional group is 5～15wt%, regulate and make the pH value of this mixed solution between 2～4 with diluted acid again, and after 1～50 ℃ of water bath with thermostatic control reaction 18～72h, this mixed solution is carried out to centrifugal, filtration, carry out the several times washing with deionized water and absolute ethyl alcohol, obtain having the two-dimentional silicon structure stratified material of amido functional group after vacuum drying 12～48h;
Described surfactant is a kind of in lauryl sodium sulfate or dodecyl sodium sulfate;
(2) this two dimension silicon structure stratified material is joined in absolute ethyl alcohol, and carry out ultrasonic this two dimension silicon structure stratified material that makes and be distributed in absolute ethyl alcohol fully, form and mix suspension, the mass percent of this two dimension silicon structure stratified material is 0.002～5wt%; Chlorauric acid solution is joined in this mixing suspension, and carry out the ultrasonic chlorauric acid solution that makes and be uniformly dispersed, the mass ratio of this gold chloride and two-dimentional silicon structure stratified material 1: 10～1: 30; The mixing suspension that again this has been added to chlorauric acid solution is revolved the dry light-yellow precipitate that obtains of evaporate to dryness, then is re-dispersed in ethanol solution;
(3) ascorbic acid solution joined in step (2) in last prepared solution and stirred until this solution is clarified fully, dripping NaBH
4, make ascorbic acid and NaBH in solution
4molal quantity and the molal quantity of gold chloride remain between 4～9, solution is carried out to continuous stirring 2～24h, obtain the suspension of two-dimentional silicon structure stratified material load gold nano particle;
(4) last prepared suspension in step (3) is carried out to centrifugal, filtration, obtain the golden nanometer particle catalyst;
(5) this golden nanometer particle catalyst is carried out to vacuum drying.
2. the preparation method of golden nanometer particle catalyst according to claim 1, it is characterized in that, the described silane compound with amido functional group is a kind of in 3-TSL 8330, p-aminophenyl trimethoxy silane or APTES.
3. the preparation method of golden nanometer particle catalyst according to claim 1, is characterized in that, in described step (3), and this ascorbic acid and NaBH
4mol ratio adjustable arbitrarily, by regulating ascorbic acid and NaBH
4mole recently control the speed of reaction.
4. the preparation method of golden nanometer particle catalyst according to claim 1, is characterized in that, described two-dimentional silicon structure stratified material is that interlayer has regularly arranged amino and Anionic Surfactant, and the laminate silicon structure is obtain-Si-O-Si-of hydrolysis.
5. the preparation method of golden nanometer particle catalyst according to claim 1, is characterized in that, described diluted acid is a kind of in hydrochloric acid, sulfuric acid or nitric acid.
6. the preparation method of golden nanometer particle catalyst according to claim 1, is characterized in that, described ascorbic acid is a kind of in L-AA or D-araboascorbic acid.
7. one kind by the prepared golden nanometer particle catalyst of the described preparation method of claim 1, it is characterized in that: it comprises two-dimentional silicon structure stratified material and golden nanometer particle, this two dimension silicon structure stratified material is the bedded silicon structure compound with regularly arranged amido functional group, this golden nanometer particle is dispersed in the interlayer of this two dimension silicon structure stratified material, and the particle diameter of this golden nanometer particle is between 1～10nm.
8. golden nanometer particle catalyst according to claim 7, is characterized in that, the mass percent of this golden nanometer particle is 0.2～4wt%.
9. golden nanometer particle catalyst according to claim 7, is characterized in that, described two-dimentional silicon structure stratified material is that interlayer has regularly arranged amino and Anionic Surfactant, and the laminate silicon structure is obtain-Si-O-Si-of hydrolysis.
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