CN113210008A - Preparation method of Pt supported molecular sieve catalyst for cinnamaldehyde hydrogenation reaction - Google Patents

Preparation method of Pt supported molecular sieve catalyst for cinnamaldehyde hydrogenation reaction Download PDF

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CN113210008A
CN113210008A CN202110521729.3A CN202110521729A CN113210008A CN 113210008 A CN113210008 A CN 113210008A CN 202110521729 A CN202110521729 A CN 202110521729A CN 113210008 A CN113210008 A CN 113210008A
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molecular sieve
catalyst
supported
cinnamaldehyde
reaction
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薛冰
路珊
赵妍
王非
柳娜
许杰
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Changzhou University
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Abstract

The invention belongs to the field of heterogeneous catalysis, and particularly relates to a preparation method of a Pt supported molecular sieve catalyst for selective hydrogenation reaction of cinnamyl aldehyde. The catalyst prepared by the invention is used for the reaction of generating the cinnamyl aldehyde by selectively hydrogenating the cinnamyl aldehyde, has good catalytic performance when the reaction temperature is 100-120 ℃, the reaction time is 0.5-1h, the pressure of a reaction kettle is 2MPa, and the rotating speed is 1000rpm, and has simple synthesis method and low cost.

Description

Preparation method of Pt supported molecular sieve catalyst for cinnamaldehyde hydrogenation reaction
Technical Field
The invention relates to the field of preparation of heterogeneous catalysts used in selective hydrogenation reactions, in particular to a preparation method of a Pt-containing supported molecular sieve catalyst used in selective hydrogenation reactions of alpha, beta-unsaturated aldehydes such as cinnamaldehyde.
Technical Field
The cinnamaldehyde is a typical alpha, beta-unsaturated aldehyde, and the hydrogenation product of the cinnamaldehyde is an important fine chemical product, and has great application value in the fields of medicines and spices. And the cinnamaldehyde hydrogenation reaction is often used as a model reaction for selective hydrogenation of alpha, beta-unsaturated aldehydes. In the selective hydrogenation reaction of cinnamyl aldehyde to generate cinnamyl alcohol, carbon-carbon double bond hydrogenation is more favorable than carbon-oxygen double bond in thermodynamics, 3-phenylpropyl aldehyde is easier to generate instead of cinnamyl alcohol, carbon-carbon double bond hydrogenation and the conjugated effect of carbon-carbon double bond and carbon-oxygen double bond are overcome, carbon-oxygen double bond is hydrogenated, and carbon-carbon double bond is maintained at the same time, so that cinnamyl alcohol is generated.
Pt catalyst is commonly used in the hydrogenation reaction of cinnamaldehyde, wherein platinum-containing homogeneous catalyst is difficult to separate and recover, Pt supported catalyst is more commonly adopted, and microporous molecular sieve as a carrier has the advantages of good hydrothermal stability, adjustable pore channel and the like, such as Pt/HZSM-5, Pt/HMCM-22 and Pt/H beta molecular sieve. However, when a pure microporous molecular sieve is used as a catalyst, the selectivity of the product in the selective hydrogenation reaction is not high, and the catalyst is modified to induce the carbon-oxygen double bond hydrogenation when the selectivity of cinnamyl alcohol in the hydrogenation process of cinnamyl aldehyde is further improved.
The general modification treatment methods include: firstly, the aperture is enlarged, which is beneficial to the diffusion of reactants; secondly, the presence of Lewis acid can activate carbon-oxygen double bonds and promote the conversion of the carbon-oxygen double bonds; thirdly, the grain size of Pt is increased, so that the crystal face of Pt (111) is improved, the Pt (111) is repelled from carbon-carbon double bonds, and the adsorption of the carbon-carbon double bonds is inhibited; and fourthly, introducing a second metal such as Fe, Sn and the like as an electron donor to improve the Pt electron density, or as an affinity potential or a Lewis acid to activate carbon-oxygen double bonds. Increasing the Pt particle size may cause Pt nanoparticles to aggregate, and reducing the dispersity leads to reduced catalytic activity; the operation of introducing the second metal is complex and complicated, the energy consumption is high, and the method can not be applied to industrial large-scale use.
Therefore, an efficient Pt supported molecular sieve catalyst is developed, so that the catalyst can more effectively improve the selectivity of cinnamyl alcohol in the hydrogenation process of cinnamyl aldehyde and has important application value.
Disclosure of Invention
The invention aims to solve the technical problems of low catalytic effect, complex catalyst preparation process and the like in the reaction process of generating cinnamyl alcohol by selective hydrogenation of cinnamyl aldehyde, and provides a preparation method of a Pt supported molecular sieve catalyst which is simple in synthesis method, low in cost, good in catalytic effect and high in selectivity.
The technical scheme adopted by the invention for solving the problems is as follows:
(1) adding the microporous molecular sieve into deionized water, and stirring at room temperature for 10min, wherein the mass ratio of the microporous molecular sieve to the deionized water is 1:10-1: 20;
(2) dropwise adding a sodium hydroxide solution into the mixture obtained in the step (1) in a mass ratio of 1:0.04 to the microporous molecular sieve in the step (1), and continuously stirring at room temperature for 30min, wherein the concentration of the sodium hydroxide solution is 0.1 mol.L-1；
(3) Dropwise adding a chloroplatinic acid solution prepared by acetone into the mixture obtained in the step (2), and continuously stirring at room temperature for 2h, wherein the mass of Pt in the chloroplatinic acid is 1% of that of the microporous molecular sieve in the solution;
(4) aging the mixture obtained in the step (3) in air for 8h, drying at 80 ℃ for 12h, cooling, grinding into powder, and roasting at 550 ℃ for 4h to obtain an oxidation state catalyst;
(5) h of the oxidation state catalyst obtained in the step (4) at 400 DEG C2And reducing for 2 hours at the heating rate of 5 ℃/min under the Ar atmosphere to obtain the Pt supported molecular sieve catalyst treated by alkali.
As a limitation to the invention, the microporous molecular sieve of the invention is HZSM-5, HMCM-22 or H beta molecular sieve.
As a second limitation of the present invention, the catalyst of the present invention can be used in the process of selective hydrogenation of cinnamaldehyde to produce cinnamyl alcohol, and the specific reaction conditions are as follows: 0.2g of catalyst, 0.5mL of cinnamyl aldehyde and 20mL of absolute ethyl alcohol are taken as solvents, the reaction temperature is 100 ℃, the reaction time is 1h, the pressure of a reaction kettle is 2MPa, and the rotating speed is 1000 rpm.
The preparation method of the microporous molecular sieve HZSM-5 comprises the following steps:
putting 12.5g of sodium hydroxide into 288mL of deionized water, and stirring until the sodium hydroxide is completely dissolved; then 3.7g of sodium metaaluminate and 195mL of tetrapropylammonium hydroxide solution are added to the solution and stirred vigorously; 195mL of silica gel solution was slowly added dropwise to the solution with vigorous stirring, and vigorous stirring was continued for 30 min. Then transferring the white gel into a crystallization kettle with a polytetrafluoroethylene lining, and crystallizing for 3 days in an oven at 160 ℃; filtering, washing to pH 9.0, stoving at 110 deg.c for 24 hr, and roasting in muffle at 550 deg.c for 8 hr to obtain NaZSM-5 microporous molecular sieve. NaZSM-5 with 2mol/L NH4NO3And (3) carrying out reflux exchange on the solution (10mg/g catalyst) at 80-100 ℃ for 2 times, each time for 4 hours, carrying out suction filtration, washing with deionized water, drying (120 ℃), and finally roasting in a muffle furnace at 550 ℃ to obtain the HZSM-5 molecular sieve.
The preparation method of the microporous molecular sieve HMCM-22 comprises the following steps:
dissolving 13.3g of sodium hydroxide in 443mL of deionized water; then adding 4g of sodium metaaluminate and 38mL of hexamethyleneimine into the solution, and stirring vigorously; 195mL of silica sol was slowly added dropwise to the above solution under vigorous stirring, and vigorous stirring was continued for 30 min. Transferring the obtained white gel into a crystallization kettle with a polytetrafluoroethylene lining, and crystallizing for 7 days in an oven at 150 ℃; then filtering and washingAnd drying the mixture at the temperature of 110 ℃ for 24h until the pH value is 8.0, and then roasting the dried mixture in a muffle furnace at the temperature of 550 ℃ for 8h to obtain the microporous molecular sieve NaMCM-22. The NaMCM-22 is mixed with 2mol/L NH4NO3And (3) carrying out reflux exchange on the solution (10mg/g catalyst) at 80-100 ℃ for 2 times, each time for 4 hours, carrying out suction filtration, washing with deionized water, drying (120 ℃), and finally roasting in a muffle furnace at 550 ℃ to obtain the HMCM-22 molecular sieve.
The microporous molecular sieve H beta is prepared by the following steps:
5.3g of sodium hydroxide is put into 162mL of deionized water and stirred until the sodium hydroxide is completely dissolved; then 5.4g of sodium metaaluminate and 79mL of tetraethylammonium hydroxide are added to the solution and stirred vigorously; 195mL of silica sol was slowly added dropwise to the above solution under vigorous stirring, and vigorous stirring was continued for 30 min. Transferring the obtained white gel into a crystallization kettle with a polytetrafluoroethylene lining, and crystallizing for 3 days in an oven at 140 ℃; and after crystallization is finished, naturally cooling the reaction kettle to room temperature, performing suction filtration, washing the reaction kettle to be neutral by using deionized water, and drying to obtain the beta zeolite raw powder. 2mol/L NH is used for beta zeolite4NO3And (3) carrying out reflux exchange on the solution (10mg/g catalyst) at 80-100 ℃ for 2 times, each time for 4 hours, carrying out suction filtration, washing with deionized water, drying (120 ℃), and finally roasting in a muffle furnace at 550 ℃ to obtain the H beta molecular sieve.
After the technical scheme is adopted, the invention has the beneficial effects that:
the Pt supported molecular sieve hydrogenation catalyst provided by the invention is simple in synthesis method and low in cost.
Meanwhile, the microporous molecular sieve is modified, and the catalyst is subjected to desilication treatment by using sodium hydroxide, so that the microporous molecular sieve can be subjected to pore expansion to generate a partial mesoporous structure, reactants can be better diffused, and Lewis acid sites in the catalyst structure can be reserved, so that the Pt supported molecular sieve catalyst subjected to alkali treatment has better conversion rate and higher selectivity on the selective hydrogenation of cinnamyl aldehyde to generate cinnamyl alcohol.
Drawings
FIG. 1 is a nitrogen adsorption and desorption isotherm for an untreated molecular sieve and an alkali-treated molecular sieve, where Cat1, Cat 3, and Cat5 are untreated molecular sieves Pt/HZSM-5, Pt/HMCM-22, and Pt/H β, respectively; cat 2, Cat4, and Cat 6 are sodium hydroxide modified molecular sieves Pt/HZSM-5, Pt/HMCM-22, and Pt/H β, respectively.
As can be seen from FIG. 1, Cat 3 and Cat5 in the figure are I-type isotherms and are typical microporous structures; and the isotherms of the molecular sieves Cat 2, Cat4 and Cat 6 treated by the sodium hydroxide are IV-type isotherms, so that a hysteresis loop appears, which indicates that a mesoporous structure exists, and the method can effectively desiliconize the microporous molecular sieve to generate a part of mesoporous structure.
FIG. 2 is a TEM image of Pt/HZSM-5 before treatment (left image of FIG. 2) and Pt/HZSM-5 after alkali treatment (right image of FIG. 2).
As can be seen from FIG. 2, the untreated molecular sieve Pt/HZSM-5 (left picture), i.e., Cat1, has a complete structure, and Pt nanoparticles slightly agglomerate in the molecular sieve; the slightly collapsed Pt/HZSM-5 (right picture), namely Cat 2, treated by alkali proves that the method can generate partial mesopores, and the Pt nanoparticles are uniformly dispersed and basically consistent in size.
Detailed Description
The invention will be further described in the following examples, but it is to be understood that these examples are for illustrative purposes only and are not to be construed as limiting the practice of the invention.
Example 1 (comparative example)
Adding 0.5g microporous molecular sieve HZSM-5 into 10mL deionized water, stirring at room temperature for 30min, dropwise adding 1.34mL chloroplatinic acid solution prepared with acetone, stirring at room temperature for 2H, aging the obtained mixture in air for 8H, drying at 80 deg.C for 12H, cooling, grinding into powder, calcining at 550 deg.C for 4H to obtain oxidation state catalyst, and adding H at 400 deg.C2And reducing for 2 hours under Ar at the heating rate of 5 ℃/min to obtain Pt/HZSM-5 which is marked as Cat 1.
Example 2
Adding 0.5g microporous molecular sieve HZSM-5 into 5mL deionized water, stirring at room temperature for 10min, dropwise adding 5mL sodium hydroxide solution prepared into 0.1mol/L into the mixture, continuously stirring at room temperature for 30min, dropwise adding 1.34mL chloroplatinic acid solution prepared into acetone, continuously stirring at room temperature for 2h, and allowing the obtained mixture to stand in the airAging for 8H, drying at 80 deg.C for 12H, cooling, grinding into powder, calcining at 550 deg.C for 4H to obtain oxidation state catalyst, and reacting at 400 deg.C with hydrogen2And reducing for 2 hours under Ar at the heating rate of 5 ℃/min to obtain the Pt/HZSM-5 (alkali) treated by the alkali, and marking as Cat 2.
Example 3 (comparative example)
Adding 0.5g microporous molecular sieve HMCM-22 into 10mL deionized water, stirring at room temperature for 30min, dropwise adding 1.34mL chloroplatinic acid solution prepared with acetone, stirring at room temperature for 2H, aging the obtained mixture in air for 8H, drying at 80 deg.C for 12H, cooling, grinding into powder, calcining at 550 deg.C for 4H to obtain oxidation state catalyst, and adding H at 400 deg.C2And reducing for 2h under Ar at the heating rate of 5 ℃/min to obtain Pt/HMCM-22, and marking as Cat 3.
Example 4
Adding 0.5g microporous molecular sieve HMCM-22 into 5mL deionized water, stirring at room temperature for 10min, adding 5mL sodium hydroxide solution prepared into 0.1mol/L dropwise into the mixture, stirring at room temperature for 30min, adding 1.34mL chloroplatinic acid solution prepared into acetone dropwise, stirring at room temperature for 2H, aging the mixture in air for 8H, drying at 80 deg.C for 12H, cooling, grinding into powder, calcining at 550 deg.C for 4H to obtain oxidation state catalyst, and calcining at 400 deg.C for H2And reducing for 2h under Ar at the heating rate of 5 ℃/min to obtain the Pt/HMCM-22 (alkali) treated by the alkali, and marking as Cat 4.
Example 5 (comparative example)
Adding 0.5g of microporous molecular sieve H beta into 10mL of deionized water, stirring at room temperature for 30min, dropwise adding 1.34mL of chloroplatinic acid solution prepared by acetone, continuously stirring at room temperature for 2H, aging the obtained mixture in air for 8H, drying at 80 ℃ for 12H, cooling, grinding into powder, roasting at 550 ℃ for 4H to obtain an oxidation state catalyst, and adding H beta at 400 ℃ to obtain a catalyst2And reducing for 2 hours under Ar at the heating rate of 5 ℃/min to obtain Pt/H beta, which is marked as Cat 5.
Example 6
Adding 0.5g of microporous molecular sieve H beta into 5mL of deionized water, stirring at room temperature for 10min, dropwise adding 5mL of sodium hydroxide solution prepared into the mixture at a concentration of 0.1mol/L, and continuing to addStirring at room temperature for 30min, adding dropwise 1.34mL of chloroplatinic acid solution prepared with acetone, stirring at room temperature for 2H, aging the obtained mixture in air for 8H, drying at 80 deg.C for 12H, cooling, grinding into powder, calcining at 550 deg.C for 4H to obtain oxidized catalyst, and adding hydrogen at 400 deg.C2And reducing for 2H under Ar at the heating rate of 5 ℃/min to obtain the Pt/H beta (alkali) treated by the alkali, and marking as Cat 6.
The alkali-treated Pt supported molecular sieve catalyst obtained in the embodiment is used for selective hydrogenation reaction of cinnamaldehyde, the cinnamaldehyde is used as a raw material, absolute ethyl alcohol is used as a solvent, the Pt supported molecular sieve catalyst is added when the reaction temperature is 100-120 ℃, and the mass ratio of the cinnamaldehyde to the Pt supported molecular sieve catalyst is 5: 2-3, the reaction time is 0.5-1h, the pressure of the reaction kettle is 2MPa, and the rotating speed is 1000 rpm.
The Cat 1-6 is applied to the following specific reaction: 0.2g of catalyst, 0.5mL of cinnamyl aldehyde and 20mL of absolute ethyl alcohol are taken as solvents, the reaction temperature is 100 ℃, the reaction time is 1h, the pressure of a reaction kettle is 2MPa, and the rotating speed is 1000 rpm.
The catalytic performance of each catalyst is shown in table 1:
TABLE 1 catalytic Performance of Pt-supported molecular sieve catalysts
Catalyst and process for preparing same Cinnamic aldehyde conversion (%) Cinnamyl alcohol selectivity (%)
Cat1 (comparative example) 52.3 73.1
Cat 2 95.8 90.7
Cat 3 (comparative example) 16.0 46.6
Cat 4 83.0 82.3
Cat5 (comparative example) 12.2 33.7
Cat 6 85.4 85.6
The results in table 1 show that the alkali-treated Pt-supported molecular sieve catalyst provided by the invention has good reaction catalytic performance for selective hydrogenation of cinnamaldehyde to form cinnamaldehyde, and has high conversion rate for cinnamaldehyde and excellent selectivity for cinnamyl alcohol.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (4)

1. A preparation method of a Pt supported molecular sieve catalyst for cinnamaldehyde hydrogenation reaction is characterized in that the preparation method of the Pt supported molecular sieve catalyst is that a microporous molecular sieve is used as a matrix, Pt is supported on the microporous molecular sieve by adopting a normal-temperature impregnation method, and the catalyst is subjected to desilication and pore expansion by an alkali treatment method.
2. A preparation method of a Pt supported molecular sieve catalyst for cinnamaldehyde hydrogenation reaction is characterized by comprising the following steps:
(1) adding a microporous molecular sieve into deionized water, wherein the mass ratio of the microporous molecular sieve to the deionized water is 1:10-1: 20;
(2) dropwise adding sodium hydroxide solution into the mixture obtained in the step (1) in a mass ratio of 1:0.04 to the microporous molecular sieve in the step (1), wherein the concentration of the sodium hydroxide solution is 0.1 mol.L-1；
(3) Dropwise adding a chloroplatinic acid solution prepared by acetone into the mixture obtained in the step (2), wherein the mass of Pt in the chloroplatinic acid is 0.5-0.8% of the mass of the microporous molecular sieve in the solution;
(4) aging and drying the mixture obtained in the step (3) in air for 12h, cooling, grinding into powder, and roasting at 550 ℃ for 4h to obtain an oxidation state catalyst;
(5) h of the oxidation state catalyst obtained in the step (4) at 400 DEG C2And reducing for 2 hours at the heating rate of 5 ℃/min under the Ar atmosphere to obtain the Pt supported molecular sieve catalyst treated by alkali.
3. The method of preparing a Pt-supported molecular sieve catalyst for cinnamaldehyde hydrogenation according to claim 1, wherein the microporous molecular sieve is HZSM-5, HMCM-22, or H β molecular sieve.
4. The preparation method of the Pt supported molecular sieve catalyst for hydrogenation of cinnamaldehyde according to claim 1, wherein the Pt supported molecular sieve catalyst is applied to selective hydrogenation of cinnamaldehyde to cinnamyl alcohol as follows:
taking cinnamaldehyde as a raw material, taking absolute ethyl alcohol as a solvent, and adding a Pt supported molecular sieve catalyst at the reaction temperature of 100-120 ℃, wherein the mass ratio of the cinnamaldehyde to the Pt supported molecular sieve catalyst is 5: 2-3, the reaction time is 0.5-1h, the pressure of the reaction kettle is 2MPa, and the rotating speed is 1000 rpm.
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