CN109985622A - One kettle way prepares γ-Al2O3The Au-Pd catalyst of load - Google Patents
One kettle way prepares γ-Al2O3The Au-Pd catalyst of load Download PDFInfo
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Abstract
γ-Al is prepared there is provided herein a kind of2O3The short-cut method of the Au-Pd catalyst of load.The present invention is with inorganic salts AlCl3·6H2O and NaAlO2For silicon source, with HAuCl4For Jin Yuan, PdCl2For palladium source, one kettle way is prepared for γ-Al under the conditions of coupling agent (3- mercaptopropyi) trimethoxy silane (MPTMS) is existing2O3The Au-Pd catalyst of load, and probed into influence of the MPTMS content to catalyst benzyl alcohol oxidation reactivity worth.The presence of coupling agent makes Au, Pd active component effectively load to γ-Al2O3In load.Prepared catalyst benzaldehyde yield is up to 74.9%.This method preparation flow is simple, is not necessarily to high temperature crystallization, reduces costs;Gained catalyst gold-palladium dispersion degree is higher, and Au-Pd nano-scale is smaller.
Description
Technical field
The present invention, which designs, a kind of prepares γ-Al2O3The short-cut method of the Au-Pd catalyst of load.This method preparation flow letter
Single, gained catalyst performance is more excellent.With inorganic salts AlCl3·6H2O and NaAlO2For silicon source, led by structure of PluronicP123
To agent, MPTMS is coupling agent, with HAuCl4For Jin Yuan, PdCl2Mesoporous γ-Al is prepared for palladium source2O3The Au-Pd of load receives
Rice catalyst.
Background technique
Currently, benzaldehyde " green " production technology mainly has toluene oxidation method, reduction method and benzyl alcohol direct oxidation method etc..
Wherein toluene oxidation method is low since there are product yields, the defect more than by-product, limits its industrial applications, and reduction method by
It is excessively high without the market competitiveness in hydrogenation reduction process production cost.Benzyl alcohol direct oxidation method, due to being passed through with atom
Ji property is high, simple process, environmental-friendly feature and show good application prospect.In recent years, with air, pure oxygen, double
Oxygen water and its derivative are oxidant, with the research of metal or the nonmetallic alcohol compound catalytic oxidation for catalyst
At once it gives birth to, " green, efficient " is its maximum feature.But how to prepare green, efficient catalyst is still the field
One of problem.
Research shows that noble metal nano catalyst shows higher work in the reaction of benzyl alcohol liquid phase oxidation producing benzaldehyde
Property, especially load type bimetal catalyst such as Au-Pd, Au-Cu and Au-Ir etc..Hutchings etc. is double golden by the gold-palladium of preparation
Metal catalyst is used for benzyl alcohol oxidation research, the results showed that gold-palladium bimetallic catalyst has higher benzene compared with single-metal reforming catalyst
Methanol oxidative activity and benzaldehyde selectivity.Research shows that there is synergistic effect, so that the work of bimetallic catalyst between Au-Pd
Property be better than corresponding single-metal reforming catalyst.Later someone on this basis, stablizes Au-Pd bimetallic catalyst with PVP.Together
When have studied under PVP protection, bimetallic and each single metallic catalyst catalytic phenylmethanol oxidation prepare the performance of benzoic acid, as a result
Show that PVP-Au-Pd catalyst compared to other two kinds of single metallic catalysts, either makees oxidant with air or oxygen,
It all shows more excellent result.It is former to pass through atomic layer deposition (ALD) for a kind of new short-cut method of the research reports such as Lu
The Au@Pd core-shell structure copolymer bimetallic catalyst of sub accurate synthesis load, wherein the synergistic effect promoted due to passing through whole and electronics,
The Au@Pd core-shell catalyst that Pd thickness of the shell is 0.6-0.8nm shows that maximum TOF is 27600h-1。
The catalytic performance of carried noble metal nanocatalyst depends primarily on the size of noble metal nano particles, dispersion degree
With the property of carrier.Common carrier has metal oxide (TiO2, CeO2, Fe3O4And Al2O3), metal-organic framework
(MOFs), mesoporous silicon oxide, cellulose nano-fibrous and carbon material etc..Aluminium oxide is cheap and easy to get since its crystal form is abundant, tool
Have good physicochemical properties (thermal stability, chemical stability, mechanical stability) etc., be widely used in catalyst,
The fields such as catalyst carrier, adsorbent.Meso-porous alumina also has and is situated between in addition to the excellent properties with common alumina material
Pore property, catalysis, absorption property are more superior.The alumina support specific surface area industrially prepared at present is less than 250m2/ g,
Kong Rong is less than 0.5m3/ g, and pore-size distribution is wider.Compared with commercial alumina, the mesoporous γ-of zwitterion double hydrolyzation preparation
Al2O3With higher specific surface area (> 400m2/ g), more flourishing cellular structure can have by the modified support of modifying agent
Different acidic sites, preferable hydrothermal stability are highly suitable as Industrial Catalysis agent carrier.The preparation method of catalyst is then determined
Determine the size and dispersion degree of noble metal nano particles, and influences its reactivity worth.The preparation of usual carrier nanometer catalyst
Method mainly has infusion process, deposition-precipitation, coprecipitation, ion-exchange etc., but traditional synthetic method mostly has work
The problems such as property component dispersion degree is poor, and metal nanoparticle easy-sintering or synthesis process are cumbersome, and condition is difficult to control.
In view of the studies above background, this research attempts to find a kind of simple effective method and receives to synthesize high dispersive noble metal
Rice catalyst, improves the stability of noble metal dispersion degree and noble metal nano catalyst, reduces production cost and catalyst cost.
γ-Al is prepared the invention discloses a kind of2O3The short-cut method of the Au-Pd catalyst of load.With (MPTMS) for one pot of coupling agent
Method is prepared for Au-Pd catalyst.MPTMS can be connected in the form of chemical bond with carrier and metal component, in coupling agent MPTMS
Under the action of Au, Pd atomic energy and carrier have stronger interaction.The catalyst of this method preparation has preferably benzyl alcohol
Oxidation susceptibility.
Summary of the invention
γ-Al is prepared the present invention provides a kind of2O3The short-cut method of the Au-Pd catalyst of load, with inorganic salts
AlCl3·6H2O and NaAlO2For silicon source, using PluronicP123 as structure directing agent, MPTMS is coupling agent, with HAuCl4For
Jin Yuan, PdCl2Mesoporous γ-Al is prepared for palladium source2O3The Au-Pd nanocatalyst of load.In Al3+And AlO2-It itself carries out double
Hydrolysis prepares mesoporous γ-Al2O3During introduce MPTMS and metal component one-step synthesis meso-porous alumina load Au-
Pd nanocatalyst (0.5%Au-0.5%Pd/ γ-Al2O3).This method has the catalyst tool that preparation flow is simple, prepared
There is preferably benzyl alcohol selective oxidation susceptibility.
Typical synthesis process is (with 0.5%Au-0.5%Pd/ γ-Al2O3) for
(1) electronic balance weighs 2.414g AlCl3·6H2O, 2.28g NaAlO2;It is separately added into 25ml deionized water,
AlCl30.41g MPTMS, magnetic agitation 30min are added dropwise in solution;
(2) by AlCl3·6H2O and NaAlO2Solution cocurrent pours into beaker, continues to stir 1.5h;
(3) 4.1ml 0.02mol/L PdCl is successively added dropwise2The HAuCl of solution and 2.1ml 0.02mol/L4, stir 4h;
(4) it weighs 2.5g P123 and adds 25ml deionized water dissolving, stir to clarify;
(5) colloidal sol for obtaining (3) carries out filtering and washing;
(6) filter cake that (5) obtain is mixed with P123 solution, stirs 4h;
(7) (6) are poured into glass dish to (4~5mm is thick), put oven drying 12h into;
(8) (7) after drying are put into tube furnace roasting, heating rate is 2 DEG C/min, is warming up to 500 DEG C, constant temperature 3h;
It is cooled to room temperature to catalyst, in a hydrogen atmosphere, 400 DEG C of reductase 12 h is warming up to 5 DEG C/min, obtain catalyst 0.5%
Au-0.5%Pd/ γ-Al2O3.Wherein 0.5% is respectively golden, palladium mass content in catalyst.
Compared with pervious preparation method, the present invention has the advantage that
(1) step of the invention directly obtains Au-Pd/ γ-Al2O3Catalyst, synthesis process are simple and easy.
(2) use of coupling agent MPTMS can make Au, Pd metal active constituent effectively load to γ-Al2O3On
(3) present invention uses cheap, nontoxic inorganic aluminate AlCl3·6H2O and NaAlO2, it is higher and have to avoid price
The use of the alkyl aluminum of poison, does not produce pollution.
Detailed description of the invention
Fig. 1 is 4 gained Au-Pd/ γ-Al of embodiment 1- example2O3The N of catalyst2Adsorption and desorption isotherms;
Fig. 2 is 4 gained Au-Pd/ γ-Al of embodiment 1- example2O3The graph of pore diameter distribution of catalyst;
Fig. 3 is 4 gained Au-Pd/ γ-Al of embodiment 1- example2O3The XRD wide-angle diffraction figure of catalyst;
Table 1 is 4 gained Au-Pd/ γ-Al of embodiment 1- example2O3Catalyst benzyl alcohol oxidation result
Specific embodiment
Embodiment 1: at room temperature, respectively by 2.414g AlCl3·6H2O and 2.28g NaAlO2It is dissolved in 25ml distilled water.
In AlCl30.41g MPTMS is added dropwise in solution, according to Al2O3/ MPTMS mole for equal to 10:1;By AlCl3With NaAlO2It is molten
Liquid cocurrent pours into beaker, generates white precipitate, and gained mixture stirs 1.5h at room temperature, 2.1ml 0.024mol/L is slowly added dropwise
PdCl2The HAuCl of solution and 4.25ml 0.024mol/L4Then it filtered, washed, obtained containing Au, Pd presoma
Alumine hydroxide colloid filter cake.2.5gP123 is added in 25ml deionized water, is stirred to clarify, then by P123 solution with
The mixing of alumine hydroxide colloid filter cake, mashing stirring 4h.Product after mashing is placed under 100 DEG C of baking ovens dry 12h, then in horse
500 DEG C not are warming up to the heating rate of 2 DEG C/min in furnace, 500 DEG C of constant temperature calcining 3h.In a hydrogen atmosphere, with 5 DEG C/min liter
Temperature obtains catalyst sample 1 to 400 DEG C of reductase 12 h.The specific surface area of gained catalyst is 397.9m2/ g, Kong Rong 1.2cm3/ g,
Average pore size 12.4nm.The benzaldehyde yield of the catalyst is 58.7%.
Embodiment 2: at room temperature, respectively by 2.414g AlCl3·6H2O and 2.28g NaAlO2It is dissolved in 25ml distillation respectively
In water.In AlCl30.26g MPTMS is added dropwise in solution, according to Al2O3The molar ratio of/MPTMS is equal to 15;By AlCl3With NaAlO2
Solution cocurrent pours into beaker, generates white precipitate, and gained mixture stirs 1.5h at room temperature, 2.1ml is slowly added dropwise
The PdCl of 0.024mol/L2Solution and 4.25ml, the HAuCl of 0.024mol/L4Then filtered, washed, obtain containing Au,
The alumine hydroxide colloid filter cake of Pd presoma.2.5gP123 is added in 25ml deionized water, is stirred to clarify, then will
P123 solution is mixed with alumine hydroxide colloid filter cake, mashing stirring 4h.Product after mashing is placed under 100 DEG C of baking ovens dry
Then 12h is warming up to 500 DEG C in Muffle furnace with the heating rate of 2 DEG C/min, 500 DEG C of constant temperature calcining 3h.In hydrogen atmosphere
Under, 400 DEG C of reductase 12 h are warming up to 5 DEG C/min, obtain catalyst sample 2.The specific surface area of gained catalyst is 449.0m2/
G, Kong Rong 1.0cm3/ g, average pore size 9.3nm.The benzaldehyde yield of the catalyst is 74.9%.
Embodiment 3: at room temperature, respectively by 2.414g AlCl3·6H2O and 2.28g NaAlO2It is dissolved in 25ml distillation respectively
In water.In AlCl30.26g MPTMS is added dropwise in solution, according to Al2O3The molar ratio of/MPTMS is equal to 20;By AlCl3With NaAlO2
Solution cocurrent pours into beaker, generates white precipitate, and gained mixture stirs 1.5h at room temperature, 2.1ml is slowly added dropwise
The PdCl of 0.024mol/L2Solution and 4.25ml, the HAuCl of 0.024mol/L4Then filtered, washed, obtain containing Au,
The alumine hydroxide colloid filter cake of Pd presoma.2.5g P123 is added in 25ml deionized water, is stirred to clarify, then will
P123 solution is mixed with alumine hydroxide colloid filter cake, mashing stirring 4h.Product after mashing is placed under 100 DEG C of baking ovens dry
Then 12h is warming up to 500 DEG C in Muffle furnace with the heating rate of 2 DEG C/min, 500 DEG C of constant temperature calcining 3h.In hydrogen atmosphere
Under, 400 DEG C of reductase 12 h are warming up to 5 DEG C/min, obtain catalyst sample 3.The specific surface area of gained catalyst is 453.7m2/
G, Kong Rong 1.3cm3/ g, average pore size 11.4nm.The benzaldehyde yield of the catalyst is 61.52%.
Embodiment 4: at room temperature, respectively by 2.414g AlCl3·6H2O and 2.28g NaAlO2It is dissolved in 25ml distillation respectively
In water.In AlCl30.1g MPTMS is added dropwise in solution, according to Al2O3The molar ratio of/MPTMS is equal to 40;By AlCl3With NaAlO2
Solution cocurrent pours into beaker, generates white precipitate, and gained mixture stirs 1.5h at room temperature, 2.1ml is slowly added dropwise
The PdCl of 0.024mol/L2Solution and 4.25ml, the HAuCl of 0.024mol/L4Then filtered, washed, obtain containing Au,
The alumine hydroxide colloid filter cake of Pd presoma.2.5g P123 is added in 25ml deionized water, is stirred to clarify, then will
P123 solution is mixed with alumine hydroxide colloid filter cake, mashing stirring 4h.Product after mashing is placed under 100 DEG C of baking ovens dry
Then 12h is warming up to 500 DEG C in Muffle furnace with the heating rate of 2 DEG C/min, 500 DEG C of constant temperature calcining 3h.In hydrogen atmosphere
Under, 400 DEG C of reductase 12 h are warming up to 5 DEG C/min, obtain catalyst sample 4.The specific surface area of gained catalyst is 466.7m2/
G, Kong Rong 1.4cm3/ g, average pore size 12.1nm.The benzaldehyde yield of the catalyst is 54.9%.
Claims (6)
1. a kind of one kettle way prepares γ-Al2O3The synthetic method of the Au-Pd catalyst of load, with 0.5%Au-0.5%Pd/ γ-
Al2O3For, synthesis step is as follows
(1) respectively by a certain amount of AlCl3·6H2O and NaAlO2It is dissolved in appropriate amount of deionized water and prepares AlCl3And NaAlO2It is molten
Liquid, and in AlCl3A certain amount of MPTMS, magnetic agitation 30min to clarification are added dropwise in solution;
(2) cocurrent mixes AlCl obtained by (1) at room temperature3And NaAlO2Solution stirs 1.5h after mixing;Then it is added dropwise certain
Measure the HAuCl of 0.02mol/L4The PdCl of solution and 0.02mol/L2Solution continues to stir 4-8h;
(3) a certain amount of P123 is added in appropriate amount of deionized water and stirs 1h, form clear P123 solution;
(4) product that step (2) obtains is filtered, is washed, and obtains the aluminum hydroxide filter cake containing Au, Pd presoma, by P123
Solution is added in this filter cake and 3-4h is sufficiently stirred;
(5) (4) are poured into glass dish to (4~5mm is thick), put oven drying 12-48h into;
(6) product after drying is warming up to set temperature, and one section of constant temperature calcining in Muffle furnace with the heating rate of 2 DEG C/min
Then time is restored in a hydrogen atmosphere, obtain purpose product 0.5%Au-0.5%Pd/ γ-Al2O3Catalyst.
2. 0.5%Au-0.5%Pd/ γ-Al according to claim 12O3Synthetic method, it is characterised in that: step (1)
The AlCl3The concentration of aqueous solution is best for 0.4-0.6mol/L, and NaAlO2The concentration of aqueous solution be 1.0-2.0mol/L most
It is good, Al2O3The molar ratio of/MPTMS is best when being 10-40.
3. 0.5%Au-0.5%Pd/ γ-Al according to claim 12O3Synthetic method, it is characterised in that: step (2)
It is described that PdCl is first added dropwise2HAuCl is added dropwise after solution4It solution and to be added dropwise dropwise, stirring to fully reacting, reaction time 4-8h.
4. 0.5%Au-0.5%Pd/ γ-Al according to claim 12O3Synthetic method, it is characterised in that: step (3)
The AlCl3·6H2The molar ratio of O and P123 is best 22.7~38.7.
5. 0.5%Au-0.5%Pd/ γ-Al according to claim 12O3Synthetic method it is characterized by: step (5)
Described in the liquefied mixture thickness that covers on surface plate in 3mm~5mm range be it is best, drying temperature is at 80-120 DEG C for most
It is suitable for.
6. 0.5%Au-0.5%Pd/ γ-Al according to claim 12O3Synthetic method it is characterized by: step (5)
It is described, the maturing temperature of dried product exhibited at 450-550 DEG C be it is best, calcining time is that 3-8h is best, hydrogen reducing temperature
300-400 DEG C be it is best, recovery time 2-3h is best.
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