Rare-earth-additive-containing catalyst for preparing propyl alcohol through propionaldehyde hydrogenation as well as preparation method and application of catalyst

Abstract

The invention relates to a catalyst containing a rare earth auxiliary agent and used for preparing propyl alcohol through propionaldehyde hydrogenation and a preparation method and application of the catalyst, and relates to the technical field of catalysts.The preparation method comprises the following steps that a first mixed solution containing a copper source, a zinc source, an aluminum source and a rare earth metal source is obtained; carrying out a co-precipitation reaction on the mixed solution containing the copper source, the zinc source and the aluminum source and a carbonate solution, and then carrying out aging treatment to obtain a second mixed solution; and filtering the second mixed solution, washing and drying the obtained precipitate to obtain a first solid, and the like. The catalyst containing the rare earth additive and used for preparing propyl alcohol through propionaldehyde hydrogenation has good catalytic performance, selectivity of propionaldehyde hydrogenation reaction can be effectively improved, generation of by-products is reduced, and the catalyst has long service life. The catalyst has a wide application prospect in industrial production of propyl alcohol, and can provide technical support for efficient and green production of propyl alcohol.

Description

Technical Field

[0001] The present invention relates to the technical field of catalysts, and in particular to a catalyst for preparing propanol by hydrogenating propionaldehyde containing a rare earth additive, a preparation method thereof, and an application thereof. Background Art

[0002] The hydrogenation of propionaldehyde to produce propanol is a key reaction process in the chemical industry, widely used in multiple fields such as pharmaceuticals, chemicals, and energy. As an important chemical solvent, pharmaceutical intermediate, and chemical raw material, propanol is widely used in the pharmaceutical industry to synthesize important drugs such as probenecid, sodium valproate, and erythromycin. It is also widely used in the chemical and food industries. However, although the propionaldehyde hydrogenation reaction has been used in industry for many years, the selectivity of traditional catalysts is low, and the formation of by-products remains one of the main challenges of this reaction. In particular, the formation of by-products such as propyl propionate not only affects the yield of propanol, but also significantly increases production costs, limiting the efficiency and cost-effectiveness of the reaction.

[0003] Currently, propionaldehyde is primarily produced globally through ethylene hydroformylation, followed by catalytic hydrogenation to produce propanol. Traditional propionaldehyde hydrogenation catalysts are mostly based on composite catalysts composed of metal oxides such as copper, zinc, and aluminum, particularly copper-zinc catalysts, which have been widely used in propionaldehyde hydrogenation reactions. However, copper-zinc catalysts suffer from the following drawbacks in practical applications: 1. Low selectivity: These catalysts are prone to forming byproducts during propionaldehyde hydrogenation, particularly propyl propionate, which affects the yield of propanol. 2. Poor catalyst stability: Over long reaction times, the catalysts exhibit poor stability and are prone to losing activity, shortening their lifespan and reducing reaction efficiency. To overcome these issues, scientists are continuously seeking ways to improve catalyst performance, particularly strategies to enhance reaction selectivity and reduce byproduct formation. In recent years, several studies and patents have addressed improvements to existing catalysts, aiming to increase the efficiency and selectivity of propionaldehyde hydrogenation reactions.

[0004] For example, CN100590108C proposes a copper-zinc catalyst for gas-phase hydrogenation of propionaldehyde. Although it can achieve a good catalytic effect in the hydrogenation reaction, the generation of by-products (such as propyl propionate) still exists. CN100564338C points out that the crude product of hydrogenation using the copper-zinc catalyst contains 0.3% to 4% of propyl propionate by-product, and the selectivity of the catalyst is still unable to fully improve the generation of by-products. CN1045548C provides an improved method for using a nickel-containing catalyst for hydrogenation of propionaldehyde to propyl alcohol, but its hydrogenated product still contains 0.7% of unconverted propionaldehyde and a small amount of by-products. Although these catalysts have improved the reaction efficiency to a certain extent, they are still unable to effectively eliminate by-products, and the long-term stability and selectivity of the catalyst are still insufficient. In addition, CN1011232B and CN1021636C propose to improve the performance of the copper-zinc catalyst by adding selectivity improvers (such as alkali metals, nickel, cobalt, etc.). These improvers can reduce the generation of propyl propionate to a certain extent. However, the practical application of these catalysts is still subject to some limitations, especially in terms of reaction selectivity and catalyst stability. Summary of the Invention

[0005] To solve the above problems, the present invention provides a catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive, as well as a preparation method and application thereof.

[0006] In a first aspect, the present invention provides a method for preparing a catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive, the method comprising the following steps:

[0007] obtaining a first mixed solution containing a copper source, a zinc source, an aluminum source, and a rare earth metal source;

[0008] subjecting the mixed solution containing the copper source, the zinc source, and the aluminum source to a coprecipitation reaction with a carbonate solution, and then subjecting the mixed solution to an aging treatment to obtain a second mixed solution;

[0009] filtering the second mixed solution, and then washing and drying the obtained precipitate to obtain a first solid;

[0010] crushing and calcining the first solid to obtain a second solid;

[0011] The second solid material, water and graphite are mixed and then pressed into shape to obtain the rare earth additive-containing propionaldehyde hydrogenation catalyst for preparing propanol.

[0012] Furthermore, the step of obtaining a first mixed solution containing a copper source, a zinc source, an aluminum source, and a rare earth metal source includes the following process:

[0013] Adding a copper source into water and dissolving it to obtain solution A;

[0014] Adding a zinc source into water and dissolving it to obtain solution B;

[0015] Adding an aluminum source into water and dissolving it to obtain solution C;

[0016] Adding a rare earth metal source into water and dissolving it to obtain a solution D;

[0017] The solution A, the solution B, the solution C and the solution D are stirred and mixed to obtain the first mixed solution containing the copper source, the zinc source, the aluminum source and the rare earth metal source.

[0018] Furthermore, the copper source includes copper nitrate, the zinc source includes zinc nitrate, the aluminum source includes aluminum nitrate, and the rare earth metal source includes lanthanum salt, cerium salt or neodymium salt.

[0019] Furthermore, the weight ratio of the copper source, the zinc source, the aluminum source and the rare earth metal source is (185-190):(185-190):(7.4-8.12):(4.06-24.37).

[0020] Furthermore, the working condition parameters of the coprecipitation reaction include: a temperature of 60-70° C., and an endpoint pH value of the coprecipitation reaction of 7.5; the working condition parameters of the calcination include: calcination at 300-350° C. for 3-5 hours.

[0021] Furthermore, the working condition parameters of the aging treatment include: temperature of 70° C. to 75° C., and time of 1 to 3 hours.

[0022] In a second aspect, the present invention provides a catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive, wherein the catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive is prepared by the preparation method of the catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive as described in any one of the first aspects.

[0023] In a third aspect, the present invention provides a use of the catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive as described in any one of the second aspects in preparing propanol by hydrogenation of propionaldehyde, wherein the weight content of propyl propionate in the obtained product is ≤0.11wt%.

[0024] The above technical solution provided by the embodiment of the present invention has at least the following advantages compared with the prior art:

[0025] Embodiments of the present invention provide a catalyst for producing propanol by hydrogenating propionaldehyde containing a rare earth additive, as well as a preparation method and application thereof. The catalyst for producing propanol by hydrogenating propionaldehyde containing a rare earth additive provided by the present invention has excellent catalytic performance, can effectively improve the selectivity of the propanaldehyde hydrogenation reaction, reduce the formation of byproducts, and has a long service life. This catalyst has broad application prospects in the industrial production of propanol and can provide technical support for the efficient and green production of propanol. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0028] Figure 1 The present invention provides a flow chart of a method for preparing a catalyst for hydrogenating propionaldehyde to propanol containing a rare earth additive. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0030] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0031] In the first aspect, the present invention provides a method for preparing a catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive, such as Figure 1 As shown, the preparation method of the catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive comprises the following steps:

[0032] obtaining a first mixed solution containing a copper source, a zinc source, an aluminum source, and a rare earth metal source;

[0033] subjecting the mixed solution containing the copper source, the zinc source, and the aluminum source to a coprecipitation reaction with a carbonate solution, and then subjecting the mixed solution to an aging treatment to obtain a second mixed solution;

[0034] filtering the second mixed solution, and then washing and drying the obtained precipitate to obtain a first solid;

[0035] crushing and calcining the first solid to obtain a second solid;

[0036] The second solid material, water and graphite are mixed and then pressed into shape to obtain the rare earth additive-containing propionaldehyde hydrogenation catalyst for preparing propanol.

[0037] An embodiment of the present invention provides a method for preparing a catalyst for preparing propanol by hydrogenating propionaldehyde containing a rare earth additive. The catalyst for preparing propanol by hydrogenating propionaldehyde containing a rare earth additive provided by the present invention adopts a copper oxide-zinc oxide-aluminum oxide composite catalyst as its matrix, and a rare earth metal additive (such as lanthanum, cerium, neodymium, etc.) is added to the catalyst to improve the selectivity of the catalyst and reduce the formation of byproducts (such as propyl propionate).

[0038] In some specific embodiments, the step of obtaining a first mixed solution containing a copper source, a zinc source, an aluminum source, and a rare earth metal source comprises the following process:

[0039] Adding a copper source into water and dissolving it to obtain solution A;

[0040] Adding a zinc source into water and dissolving it to obtain solution B;

[0041] Adding an aluminum source into water and dissolving it to obtain solution C;

[0042] Adding a rare earth metal source into water and dissolving it to obtain a solution D;

[0043] The solution A, the solution B, the solution C and the solution D are stirred and mixed to obtain the first mixed solution containing the copper source, the zinc source, the aluminum source and the rare earth metal source.

[0044] In some specific embodiments, the copper source includes copper nitrate, the zinc source includes zinc nitrate, the aluminum source includes aluminum nitrate, and the rare earth metal source includes lanthanum salt, cerium salt, or neodymium salt.

[0045] Furthermore, the weight ratio of the copper source, the zinc source, the aluminum source and the rare earth metal source is (185-190):(185-190):(7.4-8.12):(4.06-24.37).

[0046] In some specific embodiments, the working condition parameters of the coprecipitation reaction include: a temperature of 60-70° C., and an endpoint pH value of the coprecipitation reaction of 7.5; the working condition parameters of the calcination include: calcination at 300-350° C. for 3-5 hours.

[0047] In some specific embodiments, the working condition parameters of the aging treatment include: a temperature of 70° C. to 75° C. and a time of 1 to 3 hours.

[0048] In a second aspect, the present invention provides a catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive, wherein the catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive is prepared by the preparation method of the catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive as described in any one of the first aspects.

[0049] In a third aspect, the present invention provides a use of the catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive as described in any one of the second aspects in preparing propanol by hydrogenation of propionaldehyde, wherein the weight content of propyl propionate in the obtained product is ≤0.11wt%.

[0050] It should be noted that the catalyst for preparing propanol by hydrogenation of propanal containing a rare earth additive and its preparation method and the component raw materials involved in the application provided in the embodiment of the present invention, unless otherwise specified or specified, can be directly commercially available products or homemade using existing public preparation methods; at the same time, the steps and parameters involved, unless otherwise specified or specified, can be carried out according to the processing technology of the prior art or directly using existing equipment, and the present invention document will not repeat them one by one.

[0051] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended to illustrate the present invention only and are not intended to limit the scope of the invention. The experimental methods in the following examples where specific conditions are not specified are generally measured in accordance with national standards. If there are no corresponding national standards, then the methods are carried out in accordance with general international standards, conventional conditions, or the conditions recommended by the manufacturer.

[0052] Example 1

[0053] Weigh 187.55 g of copper nitrate and add it to 500 mL of deionized water. Stir until completely dissolved to prepare Solution A. Weigh 189.38 g of zinc nitrate and add it to 500 mL of deionized water. Stir until completely dissolved to prepare Solution B. Weigh 7.4 g of aluminum nitrate and add it to 50 mL of deionized water. Stir until completely dissolved to prepare Solution C. Mix Solutions A, B, and C to form a uniform solution. Co-precipitate the mixed solution with 1 mol / L sodium carbonate solution in a precipitation tank equipped with a stirrer. The precipitation temperature was maintained at 65°C, and the endpoint pH was 7.5. After the precipitation reaction, the product was aged at 72°C for 2 hours. The precipitate was thoroughly washed with deionized water to remove impurities. The washed precipitate was then dried at 90°C to a constant weight. The dried product was sieved through a 100-mesh sieve to ensure uniform particle size. The crushed catalyst sample was placed in a furnace and calcined at 320°C for 4 hours to enhance catalytic activity. The calcined catalyst was then mixed with an appropriate amount of water and graphite. After proper conditioning, the mixture was pressed into cylindrical tablets with a diameter of 6 mm and a thickness of 6 mm using a tablet press. This resulted in the catalyst used in the propionaldehyde hydrogenation reaction, designated RPOH-1.

[0054] Example 2

[0055] Weigh 187.55 g of copper nitrate and add it to 500 mL of deionized water. Stir until completely dissolved to prepare Solution A. Weigh 189.38 g of zinc nitrate and add it to 500 mL of deionized water. Stir until completely dissolved to prepare Solution B. Weigh 8.12 g of aluminum nitrate and add it to 50 mL of deionized water. Stir until completely dissolved to prepare Solution C. Weigh 4.06 g of lanthanum nitrate and add it to 50 mL of deionized water. Stir until completely dissolved to prepare Solution D. Solutions A, B, C, and D were mixed to form a uniform solution. The mixed solution was co-precipitated with 1 mol / L sodium carbonate solution in a precipitation tank equipped with a stirrer. The precipitation temperature was maintained at 65°C, and the endpoint pH was 7.5. After the precipitation reaction was complete, the precipitate was aged at 72°C for 2 hours. The precipitate was thoroughly washed with deionized water to remove impurities. The washed precipitate was dried at 90°C to constant weight. The dried product was pulverized through a 100-mesh sieve to ensure uniform particle size. The pulverized catalyst sample was placed in a furnace and calcined at 320°C for 4 hours to enhance catalyst activity. The calcined catalyst was mixed with an appropriate amount of water and graphite. After proper conditioning, the mixture was pressed into cylindrical tablets with a diameter of 6 mm and a thickness of 6 mm using a tablet press. This resulted in the catalyst for propionaldehyde hydrogenation, designated RPOH-2.

[0056] Example 3

[0057] Weigh 187.55 grams of copper nitrate and add it to 500 mL of deionized water. Stir until completely dissolved to prepare Solution A. Weigh 189.38 grams of zinc nitrate and add it to 500 mL of deionized water. Stir until completely dissolved to prepare Solution B. Weigh 7.4 grams of aluminum nitrate and add it to 50 mL of deionized water. Stir until completely dissolved to prepare Solution C. Weigh 16.25 grams of lanthanum nitrate and add it to 50 mL of deionized water. Stir until completely dissolved to prepare Solution D. Solutions A, B, C, and D were mixed to form a uniform solution. The mixed solution was co-precipitated with 1 mol / L sodium carbonate solution in a precipitation tank equipped with a stirrer. The precipitation temperature was maintained at 65°C, and the endpoint pH was 7.5. After the precipitation reaction was complete, the precipitate was aged at 72°C for 2 hours. The precipitate was thoroughly washed with deionized water to remove impurities. The washed precipitate was dried at 90°C to constant weight. The dried product was pulverized through a 100-mesh sieve to ensure uniform particle size. The pulverized catalyst sample was placed in a furnace and calcined at 320°C for 4 hours to enhance catalyst activity. The calcined catalyst was mixed with an appropriate amount of water and graphite. After proper conditioning, the mixture was pressed into cylindrical tablets with a diameter of 6 mm and a thickness of 6 mm using a tablet press. This resulted in the catalyst for propionaldehyde hydrogenation, designated RPOH-3.

[0058] Example 4

[0059] Weigh 187.55 g of copper nitrate and add it to 500 mL of deionized water. Stir until completely dissolved to prepare Solution A. Weigh 189.38 g of zinc nitrate and add it to 500 mL of deionized water. Stir until completely dissolved to prepare Solution B. Weigh 7.4 g of aluminum nitrate and add it to 50 mL of deionized water. Stir until completely dissolved to prepare Solution C. Weigh 24.37 g of lanthanum nitrate and add it to 50 mL of deionized water. Stir until completely dissolved to prepare Solution D. Solutions A, B, C, and D were mixed to form a uniform solution. The mixed solution was co-precipitated with 1 mol / L sodium carbonate solution in a precipitation tank equipped with a stirrer. The precipitation temperature was maintained at 65°C, and the endpoint pH was 7.5. After the precipitation reaction was complete, the precipitate was aged at 72°C for 2 hours. The precipitate was thoroughly washed with deionized water to remove impurities. The washed precipitate was dried at 90°C to constant weight. The dried product was pulverized through a 100-mesh sieve to ensure uniform particle size. The pulverized catalyst sample was placed in a furnace and calcined at 320°C for 4 hours to enhance catalyst activity. The calcined catalyst was mixed with an appropriate amount of water and graphite. After proper conditioning, the mixture was pressed into cylindrical tablets with a diameter of 6 mm and a thickness of 6 mm using a tablet press. This resulted in the catalyst for propionaldehyde hydrogenation, designated RPOH-4.

[0060] Example 5

[0061] Weigh 187.55 g of copper nitrate and add it to 500 mL of deionized water. Stir until completely dissolved to prepare Solution A. Weigh 189.38 g of zinc nitrate and add it to 500 mL of deionized water. Stir until completely dissolved to prepare Solution B. Weigh 7.4 g of aluminum nitrate and add it to 50 mL of deionized water. Stir until completely dissolved to prepare Solution C. Weigh 16.31 g of cerium nitrate and add it to 50 mL of deionized water. Stir until completely dissolved to prepare Solution D. Solutions A, B, C, and D were mixed to form a uniform solution. The mixed solution was co-precipitated with 1 mol / L sodium carbonate solution in a precipitation tank equipped with a stirrer. The precipitation temperature was maintained at 65°C, and the endpoint pH was 7.5. After the precipitation reaction was complete, the precipitate was aged at 72°C for 2 hours. The precipitate was thoroughly washed with deionized water to remove impurities. The washed precipitate was dried at 90°C to constant weight. The dried product was pulverized through a 100-mesh sieve to ensure uniform particle size. The pulverized catalyst sample was placed in a furnace and calcined at 320°C for 4 hours to enhance catalyst activity. The calcined catalyst was mixed with an appropriate amount of water and graphite. After proper conditioning, the mixture was pressed into cylindrical tablets with a diameter of 6 mm and a thickness of 6 mm using a tablet press. This resulted in the catalyst for propionaldehyde hydrogenation, designated RPOH-5.

[0062] Example 6

[0063] Weigh 187.55 grams of copper nitrate and add it to 500 mL of deionized water. Stir until completely dissolved to prepare Solution A. Weigh 189.38 grams of zinc nitrate and add it to 500 mL of deionized water. Stir until completely dissolved to prepare Solution B. Weigh 7.4 grams of aluminum nitrate and add it to 50 mL of deionized water. Stir until completely dissolved to prepare Solution C. Weigh 16.51 grams of neodymium nitrate and add it to 50 mL of deionized water. Stir until completely dissolved to prepare Solution D. Solutions A, B, C, and D were mixed to form a uniform solution. The mixed solution was co-precipitated with 1 mol / L sodium carbonate solution in a precipitation tank equipped with a stirrer. The precipitation temperature was maintained at 65°C, and the endpoint pH was 7.5. After the precipitation reaction was complete, the precipitate was aged at 72°C for 2 hours. The precipitate was thoroughly washed with deionized water to remove impurities. The washed precipitate was dried at 90°C to constant weight. The dried product was pulverized through a 100-mesh sieve to ensure uniform particle size. The pulverized catalyst sample was placed in a furnace and calcined at 320°C for 4 hours to enhance catalyst activity. The calcined catalyst was mixed with an appropriate amount of water and graphite. After proper conditioning, the mixture was pressed into cylindrical tablets with a diameter of 6 mm and a thickness of 6 mm using a tablet press. This resulted in the catalyst for propionaldehyde hydrogenation, designated RPOH-6.

[0064] Test Case

[0065] The present invention provides a catalyst evaluation method, which uses a single-tube fixed-bed reactor for experimentation. The specific steps are as follows:

[0066] Reactor conditions: Reaction pressure range: 0.4 MPa to 0.6 MPa; Reaction starting temperature: 125°C ± 2°C;

[0067] Propionaldehyde liquid space velocity: 0.36h -1 ; Molar ratio of hydrogen to aldehyde: 10 to 30;

[0068] Catalyst evaluation indicators:

[0069] Determine the specific surface area of the catalyst;

[0070] The reaction products were analyzed by gas chromatography to determine the composition and yield of the products;

[0071] The test results are shown in Table 1.

[0072] Table 1 Catalyst specific surface area performance and evaluation results

[0073]

[0074] As shown in Table 1, the catalyst for preparing propanol by hydrogenation of propanal containing a rare earth additive provided by the present invention has good catalytic performance, can effectively improve the selectivity of the propanal hydrogenation reaction, reduce the formation of by-products, and has a long service life. This catalyst has broad application prospects in the industrial production of propanol and can provide technical support for the efficient and green production of propanol.

[0075] Various embodiments of the present invention may be presented in the form of a range; it should be understood that the description in a range format is only for convenience and brevity and should not be construed as an inflexible limitation on the scope of the invention; therefore, the range description should be considered to have specifically disclosed all possible subranges and single numerical values within the range. For example, the description of a range from 1 to 6 should be considered to have specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. In addition, whenever a numerical range is indicated herein, it is intended to include any cited numeral (fractional or integer) within the indicated range.

[0076] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for preparing a catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive, characterized in that: The preparation method comprises the following steps: obtaining a first mixed solution containing a copper source, a zinc source, an aluminum source, and a rare earth metal source; performing a coprecipitation reaction on the mixed solution containing the copper source, the zinc source and the aluminum source and the carbonate solution, followed by an aging treatment to obtain a second mixed solution; filtering the second mixed solution, and then washing and drying the obtained precipitate to obtain a first solid; crushing and calcining the first solid to obtain a second solid; The second solid material, water and graphite are mixed and then pressed into shape to obtain the rare earth additive-containing propionaldehyde hydrogenation catalyst for preparing propanol.

2. The method for preparing a catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive according to claim 1, wherein: The step of obtaining a first mixed solution containing a copper source, a zinc source, an aluminum source, and a rare earth metal source comprises the following process: Adding a copper source into water and dissolving it to obtain solution A; Adding a zinc source into water and dissolving it to obtain solution B; Adding an aluminum source into water and dissolving it to obtain solution C; Adding a rare earth metal source into water and dissolving it to obtain a solution D; The solution A, the solution B, the solution C and the solution D are stirred and mixed to obtain the first mixed solution containing the copper source, the zinc source, the aluminum source and the rare earth metal source.

3. The method for preparing a catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive according to claim 1, wherein: The copper source includes copper nitrate, the zinc source includes zinc nitrate, the aluminum source includes aluminum nitrate, and the rare earth metal source includes lanthanum salt, cerium salt or neodymium salt.

4. The method for preparing a catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive according to claim 1, wherein: The rare earth metal source is cerium nitrate or lanthanum nitrate.

5. The method for preparing a catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive according to claim 1, wherein: The weight ratio of the copper source, the zinc source, the aluminum source and the rare earth metal source is (185-190):(185-190):(7.4-8.12):(4.06-24.37).

6. The method for preparing a catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive according to claim 1, wherein: The working condition parameters of the coprecipitation reaction include: a temperature of 60-70° C., and an endpoint pH value of 7.5; the working condition parameters of the calcination include: calcination at 300-350° C. for 3-5 hours.

7. The method for preparing a catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive according to claim 1, wherein: The working condition parameters of the aging treatment include: a temperature of 70° C. to 75° C. and a time of 1 to 3 hours.

8. A catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive, characterized in that: The catalyst for preparing propanol by hydrogenating propionaldehyde containing a rare earth additive is prepared by the method for preparing the catalyst for preparing propanol by hydrogenating propionaldehyde containing a rare earth additive according to any one of claims 1 to 7.

9. Use of the catalyst for preparing propanol by hydrogenation of propionaldehyde containing a rare earth additive according to claim 8 in preparing propanol by hydrogenation of propionaldehyde, characterized in that: The weight content of propyl propionate in the obtained product is less than or equal to 0.11 wt %.

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