Platinum-based catalyst and its preparation method and application

Abstract

The present invention provides a platinum-based catalyst and its preparation method and application, which relates to the technical field of composite catalysts. The platinum-based catalyst includes CeO x Support and composited with the CeO x Pt on the support surface, wherein: the CeO x is a Ce metal coordination unsaturated compound, the CeO x In the structural formula, x is less than 2. The platinum-based catalyst having the above structure has been verified to have high 3-hydroxypropionaldehyde hydrogenation activity and selectivity in the process of hydrogenating 3-hydroxypropionaldehyde to produce 1,3-PDO, while also exhibiting excellent catalytic stability. This effectively addresses the issues of poor catalyst hydrogenation activity and catalytic selectivity in existing 1,3-PDO production processes.

Description

Technical Field

[0001] The present invention relates to the technical field of composite catalysts, in particular to a platinum-based catalyst and a preparation method and application thereof. Background Art

[0002] 1,3-Propanediol (1,3-PDO) is a key raw material for the synthesis of a new polyester material, poly(1,3-trimethylene terephthalate) (PTT). PTT, like polyethylene terephthalate (PET), is a polyester fiber, spun from the same polymer. In the 20th century, PET fiber production topped the list of all fiber types (approximately 14.5 million tons per year), and PTT fiber surpasses PET in various physical and mechanical properties. The main advantages of PTT fiber include: durability and abrasion resistance, along with the stain resistance of nylon; wrinkle-free textiles with excellent resilience; soft texture, quick drying, and easy dyeing. Consequently, PTT fiber was recognized as one of the six new petrochemical products in the United States in 1998 and is currently a hot topic in international synthetic fiber development. PTT is typically synthesized industrially using the PTA process. The synthetic route suggests that the most critical factor restricting the development of the PTT industry chain is the low-cost, high-quality supply of 1,3-PDO. As an important monomer for the production of PTT, the development and production of 1,3-PDO will inevitably become a competitive focus in the chemical industry in the 21st century.

[0003] The acrolein hydration hydrogenation process for producing 1,3-PDO was first developed by Degussa. This process offers advantages such as low cost, mild process conditions, low technical difficulty, relatively mature hydrogenation technology, and low equipment requirements, making it a viable process for large-scale production. The acrolein hydration hydrogenation process for producing 1,3-PDO comprises two main reaction processes: the hydration of acrolein and the hydrogenation of 3-hydroxypropionaldehyde. The hydrogenation of 3-hydroxypropionaldehyde typically requires a heterogeneous catalyst. The performance of the catalyst (primarily selectivity) directly impacts the quality of the 1,3-PDO produced, which in turn affects the difficulty of subsequent separation and purification, and even the quality of the PTT fiber.

[0004] Therefore, it is crucial to develop a high-performance catalyst suitable for the hydrogenation of 3-hydroxypropionaldehyde to 1,3-PDO.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The first object of the present invention is to provide a platinum-based catalyst having high 3-hydroxypropionaldehyde hydrogenation activity and selectivity and good catalytic stability in the process of hydrogenating 3-hydroxypropionaldehyde to prepare 1,3-PDO.

[0007] The second object of the present invention is to provide a method for preparing a platinum-based catalyst.

[0008] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are adopted:

[0009] The present invention provides a platinum-based catalyst, which is Pt / CeO x Composite catalysts including CeO x Support and composited with the CeO x Pt on the support surface, where:

[0010] The CeO x is a Ce metal coordination unsaturated compound, the CeO x In the structural formula, x is less than 2.

[0011] Furthermore, the Pt / CeO x CeO in composite catalyst x The mass proportion of is 90.0% to 99.5%, and the mass proportion of Pt is 0.5% to 10%;

[0012] Preferably, the Pt / CeO x CeO in composite catalyst x The mass proportion of the above-mentioned is 99%, and the mass proportion of the above-mentioned Pt is 1%.

[0013] The present invention provides a method for preparing a platinum-based catalyst, the preparation method comprising:

[0014] (A) fully dissolving a trivalent cerium salt in water, then adding a precipitant under an inert protective gas atmosphere and stirring to obtain a suspension A;

[0015] (B) adding an aqueous solution of a platinum salt precursor to the suspension A obtained in step (A) under an inert protective gas atmosphere, stirring the mixture for reaction, and then centrifuging, washing, and drying the mixture in sequence to obtain a catalyst precursor;

[0016] (C) reducing the catalyst precursor obtained in step (B) under a hydrogen atmosphere to obtain a platinum-based catalyst.

[0017] Furthermore, the trivalent cerium salt in step (A) includes at least one of cerium chloride, cerium sulfate or cerium nitrate;

[0018] The precipitant in step (A) comprises at least one of sodium hydroxide, sodium carbonate or ammonia water.

[0019] Furthermore, the molar ratio of the trivalent cerium salt to the precipitant is 1:(2-7), preferably 1:(3-5).

[0020] Furthermore, the platinum salt precursor aqueous solution in step (B) includes at least one of a chloroplatinic acid aqueous solution, a platinum acetylacetonate aqueous solution, and a platinum chloride aqueous solution;

[0021] Preferably, the concentration of the platinum salt precursor aqueous solution is 1 to 7 g (Pt) / 1000 mL, preferably 3 to 5 g (Pt) / 1000 mL.

[0022] Furthermore, in step (B), the platinum salt precursor aqueous solution is added to the suspension A and stirred for reaction at a stirring speed of 200 to 600 rpm and a stirring time of 1 to 5 hours.

[0023] Furthermore, the volume ratio of the platinum salt precursor aqueous solution to the suspension A is (1-10):(30-100).

[0024] Furthermore, the step (C) comprises: grinding the catalyst precursor into powder, and then placing it in a hydrogen atmosphere for reduction;

[0025] The reduction temperature under the hydrogen atmosphere is 100-400° C., and the time is 1-4 hours.

[0026] The present invention provides an application of the platinum-based catalyst in catalyzing the hydrogenation of 3-hydroxypropionaldehyde to produce 1,3-propylene glycol.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The platinum-based catalyst provided by the present invention comprises CeO x Support and composited with the CeO x Pt on the support surface, wherein: the CeO x is a Ce metal coordination unsaturated compound, the CeO x In the structural formula, x is less than 2. It has been verified that the platinum-based catalyst of the above structure in the present application has high 3-hydroxypropionaldehyde hydrogenation activity and selectivity in the process of preparing 1,3-PDO by hydrogenation of 3-hydroxypropionaldehyde, and has good catalytic stability.

[0029] The present invention provides a method for preparing a platinum-based catalyst. The method comprises first fully dissolving a trivalent cerium salt in water, then adding a precipitant under an inert protective gas atmosphere and stirring to obtain a suspension A. Subsequently, under an inert protective gas atmosphere, an aqueous solution of a platinum salt precursor is added to the suspension A and stirred for reaction. The mixture is then centrifuged, washed, and dried in sequence to obtain a catalyst precursor. The catalyst precursor is then reduced under a hydrogen atmosphere to obtain a platinum-based catalyst. The method has the advantages of simple processing and ease of operation.

[0030] The platinum-based catalyst provided by the present invention can be widely used in catalyzing the hydrogenation of 3-hydroxypropionaldehyde to prepare 1,3-propylene glycol. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 The Pt / CeO prepared in Example 1 and Comparative Example 1 provided in Experimental Example 1 of the present invention x and EPR spectra of Pt / CeO2. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] According to one aspect of the present invention, a platinum-based catalyst is Pt / CeO x Composite catalysts including CeO x Support and composited with the CeO x Pt on the support surface, where:

[0035] The CeO x is a Ce metal coordination unsaturated compound, the CeO x In the structural formula, x is less than 2.

[0036] The platinum-based catalyst provided by the present invention comprises CeO x Support and composited with the CeO x Pt on the support surface, wherein: the CeO x is a Ce metal coordination unsaturated compound, the CeO x In the structural formula, x is less than 2. It has been verified that the platinum-based catalyst of the above structure in the present application has high 3-hydroxypropionaldehyde hydrogenation activity and selectivity in the process of preparing 1,3-PDO by hydrogenation of 3-hydroxypropionaldehyde, and has good catalytic stability.

[0037] It should be noted that the substrate CeO of the platinum-based catalyst in this application x Ce metal coordination unsaturated compound, CeOx In the structural formula, x is less than 2. x As a Ce metal coordinated unsaturated compound loaded with Pt, the electronic structure of metal Pt can be adjusted and highly active interfacial active sites can be formed, thereby improving the hydrogenation activity and selectivity of 3-hydroxypropanal.

[0038] In a preferred embodiment of the present invention, the Pt / CeO x CeO in composite catalyst x The mass proportion of is 90.0% to 99.5%, and the mass proportion of Pt is 0.5% to 10%;

[0039] Preferably, the Pt / CeO x CeO in composite catalyst x The mass proportion of the above-mentioned is 99%, and the mass proportion of the above-mentioned Pt is 1%.

[0040] According to one aspect of the present invention, a method for preparing a platinum-based catalyst comprises:

[0041] (A) fully dissolving a trivalent cerium salt in water, then adding a precipitant under an inert protective gas atmosphere and stirring to obtain a suspension A;

[0042] (B) adding an aqueous solution of a platinum salt precursor to the suspension A obtained in step (A) under an inert protective gas atmosphere, stirring the mixture for reaction, and then centrifuging, washing, and drying the mixture in sequence to obtain a catalyst precursor;

[0043] (C) reducing the catalyst precursor obtained in step (B) under a hydrogen atmosphere to obtain a platinum-based catalyst.

[0044] The present invention provides a method for preparing a platinum-based catalyst. The method comprises first fully dissolving a trivalent cerium salt in water, then adding a precipitant under an inert protective gas atmosphere and stirring to obtain a suspension A. Subsequently, under an inert protective gas atmosphere, an aqueous solution of a platinum salt precursor is added to the suspension A and stirred for reaction. The mixture is then centrifuged, washed, and dried in sequence to obtain a catalyst precursor. The catalyst precursor is then reduced under a hydrogen atmosphere to obtain a platinum-based catalyst. The method has the advantages of simple processing and ease of operation.

[0045] It should be noted that the present application fully dissolves the trivalent cerium salt in water, then adds a precipitant, and stirs the whole process under an inert protective gas atmosphere to obtain a purple precipitate. Due to the protection of the inert atmosphere, the cerium in the precipitate is prevented from being oxidized and still exists in a large amount in the trivalent form; then the present application adds an aqueous solution of platinum salt to the above suspension, continues to stir under the protection of an inert gas, and then centrifuges, washes, and dries in sequence to obtain a platinum-based catalyst precursor.

[0046] In addition, it should be noted that the cerium salt used in this application is trivalent cerium. Since the preparation is carried out under an inert protective gas atmosphere, the prepared cerium oxide still contains a large amount of trivalent cerium, and the Ce metal coordination unsaturated product CeO is prepared. x Then, under an inert protective gas atmosphere, the platinum salt precursor aqueous solution was added to the CeO x In solution, platinum can be deposited in large quantities on CeO x surface.

[0047] In a preferred embodiment of the present invention, the trivalent cerium salt in step (A) comprises at least one of cerium chloride, cerium sulfate or cerium nitrate;

[0048] The precipitant in step (A) comprises at least one of sodium hydroxide, sodium carbonate or ammonia water.

[0049] In the above preferred embodiment, the molar ratio of the trivalent cerium salt to the precipitant is 1:(2-7), preferably 1:(3-5).

[0050] As a preferred embodiment, the molar ratio of the trivalent cerium salt to the precipitant should be controlled in the range of 1:(3-5). Too little precipitant will not allow the cerium salt to be fully precipitated, while too much precipitant will cause unnecessary waste.

[0051] In a preferred embodiment of the present invention, the platinum salt precursor aqueous solution in step (B) comprises at least one of a chloroplatinic acid aqueous solution, a platinum acetylacetonate aqueous solution, and a platinum chloride aqueous solution;

[0052] Preferably, the concentration of the platinum salt precursor aqueous solution is 1 to 7 g (Pt) / 1000 mL, preferably 3 to 5 g (Pt) / 1000 mL.

[0053] As a preferred embodiment, the aqueous solution of platinum salt precursor with the above concentration can better control the droplet velocity of platinum, thereby making the metal particle size in the obtained catalyst more uniform.

[0054] In a preferred embodiment of the present invention, in step (B), the platinum salt precursor aqueous solution is added to the suspension A and stirred for reaction at a stirring speed of 200 to 600 rpm and a stirring time of 1 to 5 hours.

[0055] In the above preferred embodiment, the volume ratio of the platinum salt precursor aqueous solution to the suspension A is (1-10):(30-100).

[0056] In a preferred embodiment of the present invention, the step (C) comprises: grinding the catalyst precursor into powder, and then placing it in a hydrogen atmosphere for reduction, so that the platinum changes from an oxidized state to a reduced metallic state;

[0057] The reduction temperature under the hydrogen atmosphere is 100-400° C., and the time is 1-4 hours.

[0058] Preferably, the hydrogen atmosphere is a mixture of hydrogen and argon or nitrogen with a content of 10% to 100%;

[0059] Preferably, the hydrogen reduction temperature is 100-400° C., and the time is 1-4 h, preferably 150-300° C., and the time is 2-3 h.

[0060] Therefore, compared with the prior art, the advantages of the present invention can be summarized as follows:

[0061] (1) The prepared platinum-based catalyst has high catalytic activity for the hydrogenation of 3-hydroxypropionaldehyde and high selectivity for the preparation of 1,3-PDO;

[0062] (2) The prepared platinum-based catalyst can be used 10 times without showing any significant decrease in activity and selectivity;

[0063] (3) The preparation method of the platinum-based catalyst of the present application has a high catalyst yield and is convenient for realizing the scaled-up production of the catalyst.

[0064] According to one aspect of the present invention, the above-mentioned platinum-based catalyst is used in catalyzing the hydrogenation of 3-hydroxypropionaldehyde to produce 1,3-propylene glycol.

[0065] The platinum-based catalyst provided by the present invention can be widely used in catalyzing the hydrogenation of 3-hydroxypropionaldehyde to prepare 1,3-propylene glycol.

[0066] The technical solution of the present invention will be further described below with reference to embodiments.

[0067] Example 1

[0068] 1wt%Pt / CeO x Preparation of a platinum-based catalyst system, the method comprising:

[0069] (1) Dissolve 4.3 g of Ce(NO3)3 in 50 mL of deionized water and stir until fully dissolved;

[0070] (2) Slowly dropwise add 4 molar equivalents of concentrated ammonia (25-28 wt%), maintaining nitrogen protection throughout the preparation process, and continue stirring for a period of time until the color of the solution turns to a purple suspension;

[0071] (3) Then, 4 mL of chloroplatinic acid aqueous solution with a concentration of 1 g (Pt) / 200 mL was slowly added dropwise and stirred for 3 h. The color of the suspension changed from purple to brownish yellow.

[0072] (4) The suspension was then centrifuged and washed with deionized water, and then dried in a drying oven at 60°C for 12 hours. The powdered catalyst precursor was then ground.

[0073] (5) The catalyst precursor was placed in a pure hydrogen atmosphere for reduction (reduction conditions: 10 ° C min -1 , 200 ° C, 2h), and the target catalyst 1wt% Pt / CeO was obtained. x .

[0074] Example 2

[0075] 10wt%Pt / CeO x Preparation of a platinum-based catalyst system, the method comprising:

[0076] (1) Dissolve 4.3 g of Ce(NO3)3 in 50 mL of deionized water and stir until fully dissolved;

[0077] (2) Slowly dropwise add 4 molar equivalents of concentrated ammonia (25-28 wt%), maintaining nitrogen protection throughout the preparation process, and continue stirring for a period of time until the color of the solution turns to a purple suspension;

[0078] (3) Then, 40 mL of chloroplatinic acid aqueous solution with a concentration of 1 g (Pt) / 200 mL was slowly added dropwise and stirred for 3 h. The color of the suspension changed from purple to brownish yellow.

[0079] (4) The suspension was then centrifuged and washed with deionized water, and then dried in a drying oven at 60°C for 12 hours. The powdered catalyst precursor was then ground.

[0080] (5) The catalyst precursor was placed in a pure hydrogen atmosphere for reduction (reduction conditions: 10 ° C min -1 , 200 ° C, 2h), and the target catalyst 10wt% Pt / CeO was obtained. x .

[0081] Example 3

[0082] 1wt%Pt / CeO x Preparation of a platinum-based catalyst system, the method comprising:

[0083] (1) Dissolve 4.3 g of Ce(NO3)3 in 50 mL of deionized water and stir until fully dissolved;

[0084] (2) Slowly dropwise add 4 molar equivalents of concentrated ammonia (25-28 wt%), maintaining nitrogen protection throughout the preparation process, and continue stirring for a period of time until the color of the solution turns to a purple suspension;

[0085] (3) Then, 2 mL of chloroplatinic acid aqueous solution with a concentration of 1 g (Pt) / 200 mL was slowly added dropwise and stirred for 3 h. The color of the suspension changed from purple to brownish yellow.

[0086] (4) The suspension was then centrifuged and washed with deionized water, and then dried in a drying oven at 60°C for 12 hours. The powdered catalyst precursor was then ground.

[0087] (5) The catalyst precursor was placed in a pure hydrogen atmosphere for reduction (reduction conditions: 10 ° C min -1 , 200 ° C, 2h), and the target catalyst 0.5wt% Pt / CeO was obtained. x .

[0088] Comparative Example 1

[0089] Preparation of 1wt% Pt / CeO2, the method comprising:

[0090] 2 g of commercial CeO2 (200 nm) carrier was dispersed in 50 mL of deionized water and stirred thoroughly. Then, 4 molar equivalents of concentrated ammonia (25-28 wt%) were slowly added dropwise and stirred for 5 min. Then, 4 mL of chloroplatinic acid aqueous solution with a concentration of 1 g (Pt) / 200 mL was slowly added dropwise and stirred for 3 h. The catalyst was then centrifuged and washed with deionized water, and then dried in a drying oven at 60 ° C for 12 h. After grinding, a powdered catalyst precursor was obtained. Finally, the catalyst precursor was reduced in a pure hydrogen atmosphere (reduction conditions: 10 ° C·min -1 , 200℃, 2h), and the control sample 1wt% Pt / CeO2 was obtained.

[0091] Comparative Example 2

[0092] Preparation of 1wt% Pt / Al2O3, the method comprising:

[0093] 2 g of commercial γ-Al2O3 carrier was dispersed in 50 mL of deionized water and stirred thoroughly. Then, 4 molar equivalents of concentrated ammonia (25-28 wt%) were slowly added dropwise and stirred for 5 min. Then, 4 mL of chloroplatinic acid aqueous solution with a concentration of 1 g (Pt) / 200 mL was slowly added dropwise and stirred for 3 h. The product was then centrifuged and washed with deionized water, and then dried in a drying oven at 60 ° C for 12 h. After grinding, a powdered catalyst precursor was obtained. Finally, the catalyst precursor was reduced in a pure hydrogen atmosphere (reduction conditions: 10 ° C·min -1 , 200℃, 2h), and the control sample 1wt% Pt / Al2O3 was obtained.

[0094] Comparative Example 3

[0095] Preparation of 1 wt% Pt / C, the method comprising:

[0096] 2 g of commercial carbon powder carrier was dispersed in 50 mL of deionized water and stirred thoroughly. Then, 4 molar equivalents of concentrated ammonia (25-28 wt%) were slowly added dropwise and stirred for 5 min. Then, 4 mL of chloroplatinic acid aqueous solution with a concentration of 1 g (Pt) / 200 mL was slowly added dropwise and stirred for 3 h. The product was then centrifuged and washed with deionized water, and then dried in a drying oven at 60 ° C for 12 h. After grinding, a powdered catalyst precursor was obtained. Finally, the catalyst precursor was reduced in a pure hydrogen atmosphere (reduction conditions: 10 ° C·min -1 , 200℃, 2h), and the control sample 1wt% Pt / C was obtained.

[0097] Comparative Example 4

[0098] Preparation of 1wt% Pt / SiO2, the method comprising:

[0099] 2 g of commercial SiO2 carrier (200 nm) was dispersed in 50 mL of deionized water and stirred thoroughly. Then, 4 molar equivalents of concentrated ammonia (25-28 wt%) were slowly added dropwise and stirred for 5 min. Then, 4 mL of chloroplatinic acid aqueous solution with a concentration of 1 g (Pt) / 200 mL was slowly added dropwise and stirred for 3 h. The catalyst was then centrifuged and washed with deionized water, and then dried in a drying oven at 60 ° C for 12 h. After grinding, a powdered catalyst precursor was obtained. Finally, the catalyst precursor was reduced in a pure hydrogen atmosphere (reduction conditions: 10 ° C·min -1 , 200℃, 2h), and the control sample 1wt% Pt / SiO2 was obtained.

[0100] Test Example 1

[0101] In order to characterize the oxygen vacancy abundance of the catalyst of the present application, the Pt / CeO prepared in Example 1 and Comparative Example 1 of the present application were x The EPR spectra of Pt / CeO2 are as follows:

[0102] (1) Take about 50 mg of the target catalyst sample Pt / CeO x Electron paramagnetic resonance spectroscopy (EPR) experiments were performed on the Pt / CeO2 sample and the control sample.

[0103] Figure 1 The Pt / CeO prepared in Example 1 and Comparative Example 1 x and EPR spectra of Pt / CeO2.

[0104] Depend on Figure 1 It can be seen that the catalyst sample Pt / CeOx Compared with the control sample Pt / CeO2, it has more abundant oxygen vacancies (g=1.96).

[0105] Test Example 2

[0106] This test example tests the 3-hydroxypropionaldehyde hydrogenation performance of the catalysts prepared in Examples 1 to 3 and Comparative Examples 1 to 4:

[0107] (1) The samples prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were weighed respectively and tested for 3-hydroxypropionaldehyde hydrogenation activity and selectivity.

[0108] Exemplarily, the 3-hydroxypropionaldehyde hydrogenation preparation process is as follows:

[0109] First, 20 mL of a 5.2 wt% aqueous solution of 3-hydroxypropanal and 0.1 g of a catalyst were simultaneously added to an intermittent hydrogenation reactor. Then, the air in the reactor was replaced with hydrogen 5 to 7 times. Finally, the hydrogen pressure was kept constant at 2 MPa, the temperature was raised to 50°C, and the hydrogenation reaction was carried out for 1 hour. Samples were then taken for gas chromatography.

[0110] The specific test results are shown in the table below:

[0111] Table: 3-Hydroxypropionaldehyde Hydrogenation Performance Test of Target Catalyst and Control Sample:

[0112]

[0113]

[0114] As can be seen from the table above, the catalyst of Example 1 is 1wt% Pt / CeO x The hydrogenation of 3-hydroxypropanal to 1,3-PDO exhibited excellent activity and selectivity (both conversion and selectivity exceeded 99%), whereas the control samples of Comparative Examples 1 to 4 did not exhibit such excellent activity or selectivity. As an important comparison, the activity and selectivity of the Pt / CeO2 control sample prepared by the impregnation method were relatively poor.

[0115] (2) Examples 1 to 3 and Comparative Examples 1 to 4 were weighed and subjected to a cyclic application test of the 3-hydroxypropanal hydrogenation reaction.

[0116] Taking the catalyst of Example 1 as an example, the 3-hydroxypropionaldehyde hydrogenation cyclic application test of the catalyst is shown in the following table:

[0117] Table: Catalyst 3-hydroxypropionaldehyde hydrogenation cyclic application test:

[0118]

[0119] As can be seen from the table above, the target catalyst 1wt% Pt / CeO x The hydrogenation of 3-hydroxypropanal to prepare 1,3-PDO showed recyclable performance, and no decrease in conversion rate and selectivity was observed after 10 cycles.

[0120] In contrast, the catalysts prepared in Comparative Examples 1 to 4 were difficult to maintain their activity and selectivity after multiple applications.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A platinum-based catalyst for catalyzing the hydrogenation of 3-hydroxypropionaldehyde to produce 1,3-propylene glycol, characterized in that: The platinum-based catalyst is Pt / CeO x Composite catalysts including CeO x Support and composited with the CeO x Pt on the support surface, where: The CeO x is a Ce metal coordination unsaturated compound, the CeO x In the structural formula, x is less than 2.

2. The use according to claim 1, characterized in that The Pt / CeO x CeO in composite catalyst x The mass proportion of the above-mentioned is 90.0%~99.5%, and the mass proportion of the above-mentioned Pt is 0.5%~10%.

3. The use according to claim 2, characterized in that The Pt / CeO x CeO in composite catalyst x The mass proportion of the above-mentioned is 99%, and the mass proportion of the above-mentioned Pt is 1%.

4. The use according to claim 1, characterized in that The preparation method of the platinum-based catalyst comprises: (A) fully dissolving a trivalent cerium salt in water, then adding a precipitant under an inert protective gas atmosphere and stirring to obtain a suspension A; (B) under an inert protective gas atmosphere, adding an aqueous solution of a platinum salt precursor to the suspension A obtained in step (A) and stirring to react, followed by centrifugation, washing, and drying to obtain a catalyst precursor; (C) Reducing the catalyst precursor obtained in step (B) under a hydrogen atmosphere to obtain a platinum-based catalyst.

5. The use according to claim 4, characterized in that The trivalent cerium salt in step (A) includes at least one of cerium chloride, cerium sulfate or cerium nitrate; The precipitant in step (A) includes at least one of sodium hydroxide, sodium carbonate or ammonia water.

6. The use according to claim 5, characterized in that The molar ratio of the trivalent cerium salt to the precipitant is 1:(2-7).

7. The use according to claim 6, characterized in that The molar ratio of the trivalent cerium salt to the precipitant is 1:(3-5).

8. The use according to claim 4, characterized in that The platinum salt precursor aqueous solution in step (B) includes at least one of a chloroplatinic acid aqueous solution, a platinum acetylacetonate aqueous solution, and a platinum chloride aqueous solution.

9. The use according to claim 8, characterized in that The concentration of the platinum salt precursor aqueous solution is 1-7 g (Pt) / 1000 mL.

10. The use according to claim 8, characterized in that The concentration of the platinum salt precursor aqueous solution is 3-5 g (Pt) / 1000 mL.

11. The use according to claim 4, characterized in that In the step (B), the platinum salt precursor aqueous solution is added to the suspension A obtained in the step (A) and stirred for reaction at a stirring speed of 200-600 rpm for a stirring time of 1-5 h.

12. The use according to claim 11, characterized in that The volume ratio of the platinum salt precursor aqueous solution to the suspension A is (1-10):(30-100).

13. The use according to claim 4, characterized in that The step (C) comprises: grinding the catalyst precursor obtained in the step (B) into powder, and then reducing it in a hydrogen atmosphere; The reduction temperature under the hydrogen atmosphere is 100-400°C and the time is 1-4 h.

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