A supported iron-molybdenum-rare earth element catalyst and its preparation method and application

Abstract

The present invention provides a supported iron-molybdenum-rare earth element catalyst, its preparation method, and application. This invention relates to the technical field of catalysts and their preparation, and is intended to address the technical issues of low raw material conversion and tetrahydrothiophene selectivity in the catalytic synthesis of tetrahydrothiophene using current catalysts. The catalyst comprises a composite of ferric sulfate, a molybdenum-containing compound, and a rare earth element-containing compound as active components. The active components are then mixed with an acid solution in a water bath, and the support and impregnation solution are then stirred and impregnated in equal volumes. The resulting sample is dried and calcined to produce the catalyst, which is then used in the tetrahydrothiophene synthesis reaction. The catalyst and synthesis process are simple and environmentally friendly, with low synthesis costs. The catalyst has a maximum conversion rate of 99.5% and a tetrahydrothiophene selectivity of 99.7%.

Description

Technical Field

[0001] The present invention belongs to the technical field of catalysts and their preparation, and in particular relates to a loaded iron-molybdenum-rare earth element catalyst and a preparation method and application thereof. Background Art

[0002] Tetrahydrothiophene is chemically stable, resistant to air oxidation, non-corrosive to materials such as gas equipment and pipeline gaskets, and does not dull the human sense of smell. Therefore, it is used as a leak warning agent for gaseous fuels such as city gas and natural gas, added in small quantities to replace odorants such as ethyl mercaptan. Tetrahydrothiophene can also be used as an intermediate in the synthesis of various new pharmaceuticals, pesticides, and additives for polymer synthesis materials. It can also be used as a solvent, chain transfer inhibitor, modifier, catalyst, petroleum model compound, and dielectric in lithium batteries.

[0003] The traditional process for the direct sulfurization of furan to tetrahydrothiophene uses molybdenum disulfide or palladium supported on activated carbon as a catalyst, followed by hydrogen reduction of thiophene to produce tetrahydrothiophene. However, existing catalysts suffer from poor selectivity and low product purity. Therefore, the development of new, cost-effective and efficient catalysts is a hot topic in the production of tetrahydrothiophene. Summary of the Invention

[0004] In response to the technical problems of low raw material conversion rate and low selectivity of tetrahydrothiophene in the catalytic synthesis of tetrahydrothiophene by current catalysts, the present invention proposes a supported iron-molybdenum-rare earth element catalyst and its preparation method and application. The catalyst exhibits excellent catalytic activity and selectivity in the tetrahydrothiophene synthesis process.

[0005] A method for preparing a supported iron-molybdenum-rare earth element catalyst, comprising the following raw materials: ferric sulfate, a molybdenum-containing compound, a rare earth-containing compound, and a carrier in a mass ratio of 1-15:1-15:1-15:55;

[0006] The following steps are involved:

[0007] (1) dissolving ferric sulfate, a molybdenum-containing compound, and a rare earth-containing compound in an acid solution at 60° C.-90° C. in a water bath, and stirring the mixture in an open container for 5 min-60 min to prepare an impregnation solution, wherein the mass percentage concentration of ferric sulfate is 1%-15%, the mass percentage concentration of the molybdenum-containing compound is 1%-15%, and the mass percentage concentration of the rare earth compound is 1%-15%;

[0008] (2) Stirring equal volumes of the support and the impregnation solution in an open container to obtain a sample, drying it, and calcining it to obtain a catalyst;

[0009] The molybdenum-containing compound is one of sodium molybdate, ammonium molybdate, cobalt molybdate, cuprous molybdate, molybdic acid, phosphomolybdic acid, ammonium phosphomolybdate, phosphotungstomolybdic acid, phosphomolybdic vanadic acid, silicomolybdic acid, and silicomolybdic vanadic acid.

[0010] The rare earth-containing compound is one of rare earth element sulfate, rare earth element nitrate, rare earth element chloride and rare earth element oxide.

[0011] The carrier is one of powdered gamma-alumina, spherical gamma-alumina and columnar gamma-alumina.

[0012] The calcination means: in a nitrogen atmosphere, heating the temperature to 400-700° C. at a heating rate of 1° C. / min-15° C. / min, maintaining the temperature for more than 4 hours, and naturally cooling the temperature to room temperature to finally obtain the catalyst.

[0013] The rare earth compound includes one of lanthanum oxide, cerium sulfate, praseodymium oxide chloride, neodymium sulfate, samarium chloride, europium oxide, gadolinium sulfate, terbium sulfate, dysprosium oxide, samarium chloride, europium sulfate, gadolinium nitrate, terbium oxide, and dysprosium nitrate.

[0014] The acid solution comprises one of hydrochloric acid, nitric acid and sulfuric acid.

[0015] The carrier and the impregnation liquid are stirred in an open manner with equal volumes, which means that at 60°C-90°C, the impregnation liquid and the carrier are stirred in an open manner with equal volumes for 1h-24h; the mass ratio of ferric sulfate to the carrier is 1-10:70, the mass ratio of the molybdenum-containing compound to the carrier is 1-10:70, and the mass ratio of the rare earth element-containing compound to the carrier is 1-10:70.

[0016] The drying refers to placing the impregnated carrier in an oven at 90° C. to 120° C. for drying for 6 h to 24 h.

[0017] The application of the supported iron-molybdenum-rare earth element catalyst in catalyzing the synthesis reaction of tetrahydrothiophene is that under certain reaction conditions, the supported molybdenum-rare earth catalyst catalyzes the reaction of A and B to generate tetrahydrothiophene.

[0018] Reactant A is tetrahydrofuran or 1,4-butanediol; reactant B is hydrogen sulfide or carbon disulfide.

[0019] The present invention has the following beneficial effects: The active components of the catalyst provided by the present invention are non-precious metals, the catalyst synthesis process is simple and environmentally friendly, and the synthesis cost is low. In the tetrahydrothiophene synthesis process, the catalyst exhibits excellent activity and selectivity, with a conversion rate of up to 99.5% for tetrahydrofuran or 1,4-butanediol and a selectivity for tetrahydrothiophene of up to 99.7%. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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, the drawings described below are only 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.

[0021] Figure 1 1 is the hydrogen nuclear magnetic resonance spectrum of the products prepared by catalyst 4 and comparative catalyst 4 in the catalytic synthesis of tetrahydrothiophene.

[0022] Figure 2 This is the standard H NMR spectrum of tetrahydrothiophene. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0024] Example 1

[0025] A supported iron-molybdenum-rare earth element catalyst is prepared by the following steps: first, ferric sulfate, cerium sulfate, and ammonium phosphomolybdate are added to dilute sulfuric acid and stirred in a 65°C water bath for 30 minutes, thereby preparing an impregnation solution in which the concentrations of ferric sulfate, cerium sulfate, and ammonium phosphomolybdate are 5wt%, 5wt%, and 5wt%, respectively. Then, 16g of powdered γ-alumina is added to 54ml of the impregnation solution, and the mixture is impregnated in a 65°C water bath with equal volumes and stirred in an open atmosphere for 2 hours. The impregnated catalyst is dried in a 90°C drying oven for 12 hours. After drying, the catalyst is placed in a tubular furnace under a nitrogen atmosphere, calcined at 500°C for 4 hours, and naturally cooled to room temperature to obtain Catalyst 1.

[0026] The catalyst is used to catalyze the reaction of tetrahydrofuran and hydrogen sulfide to produce tetrahydrothiophene: 17.5g of the above catalyst is loaded into a fixed bed reactor (quartz material) with an inner diameter of 16mm, and the reaction is carried out under a hydrogen sulfide gas space velocity of 15h -1 The performance of the catalyst was tested under the conditions of reaction temperature of 200° C. and reaction time of 15 min. Analysis of the reaction products showed that the conversion rate of tetrahydrofuran was 99.1% and the selectivity of tetrahydrothiophene was 99.5%.

[0027] Example 2

[0028] A supported iron-molybdenum-rare earth element catalyst is prepared by the following steps: first, ferric sulfate, samarium chloride, and phosphomolybdovanadic acid are added to dilute sulfuric acid and stirred in a 65°C water bath for 30 minutes, thereby preparing an impregnation solution in which the concentrations of ferric sulfate, samarium chloride, and phosphomolybdovanadic acid are 1.5 wt%, 3 wt%, and 2.5 wt%, respectively. Then, 18 g of spherical γ-alumina is added to 50 ml of the impregnation solution, and the mixture is impregnated in an 80°C water bath with equal volumes of γ-alumina and stirred in an 80°C water bath for 4 hours. The impregnated catalyst is dried in a 100°C drying oven for 15 hours. After drying, the catalyst is calcined in a tubular furnace at 550°C for 6 hours under a nitrogen atmosphere, and then naturally cooled to room temperature to obtain Catalyst 2.

[0029] The catalyst is used to catalyze the reaction of tetrahydrofuran and carbon disulfide to produce tetrahydrothiophene: 18.5g of the above catalyst is loaded into a fixed bed reactor (quartz material) with an inner diameter of 16mm, and the carbon disulfide gas space velocity is 30h -1 The performance of the catalyst was tested under the conditions of reaction temperature of 210° C. and reaction time of 20 min. Analysis of the reaction products showed that the tetrahydrofuran conversion rate of the catalyst was 99.0%, and the selectivity of tetrahydrothiophene was 99.2%.

[0030] Example 3

[0031] A supported iron-molybdenum-rare earth element catalyst is prepared by the following steps: first, ferric sulfate, neodymium sulfate, and silicomolybdic acid are added to dilute sulfuric acid and stirred in an open bath at 80°C for 35 minutes to prepare an impregnation solution, wherein the concentrations of ferric sulfate, neodymium sulfate, and silicomolybdic acid are 2wt%, 4wt%, and 4wt%, respectively. Then, 15g of spherical gamma-alumina is added to 50ml of the impregnation solution, and the mixture is impregnated in an 80°C water bath with equal volumes of stirring in an open bath for 4 hours. The impregnated catalyst is dried in a 100°C drying oven for 12 hours. After drying, the catalyst is calcined in a tubular furnace at 500°C for at least 4 hours, and then naturally cooled to room temperature to obtain Catalyst 3.

[0032] The catalyst is used to catalyze the reaction of tetrahydrofuran and hydrogen sulfide to produce tetrahydrothiophene: 17.5g of the above catalyst is loaded into a fixed bed reactor (quartz material) with an inner diameter of 16mm, and the reaction is carried out under a hydrogen sulfide gas space velocity of 18h -1 The performance of the catalyst was tested under the conditions of reaction temperature of 240°C and reaction time of 8 min. Analysis of the reaction products showed that the conversion rate of tetrahydrofuran was 99.1% and the selectivity of tetrahydrothiophene was 99.5%.

[0033] Example 4

[0034] A supported iron-molybdenum-rare earth element catalyst is prepared by the following steps: first, ferric sulfate, cerium sulfate, and ammonium phosphomolybdate are added to dilute hydrochloric acid, stirred in a 65°C water bath for 30 minutes, to prepare an impregnation solution in which the concentrations of ferric sulfate, cerium sulfate, and ammonium phosphomolybdate are 1 wt%, 5 wt%, and 5 wt%, respectively. Then, 16 g of powdered γ-alumina is added to 50 ml of the impregnation solution, and the mixture is impregnated in a 65°C water bath for 2 hours with stirring in an equal volume. The impregnated catalyst is dried in a 100°C drying oven for 12 hours. After drying, the catalyst is placed in a tubular furnace under a nitrogen atmosphere, calcined at 600°C for 4 hours, and naturally cooled to room temperature to obtain Catalyst 4.

[0035] The catalyst is used to catalyze the reaction of 1,4-butanediol and hydrogen sulfide to produce tetrahydrothiophene: 17.5g of the above catalyst is loaded into a fixed bed reactor (quartz material) with an inner diameter of 16mm, and the reaction is carried out under a hydrogen sulfide gas space velocity of 15h -1 The performance of the catalyst was tested under the conditions of reaction temperature of 180°C and reaction time of 25 min. Analysis of the reaction products showed that the 1,4-butanediol conversion rate of the catalyst was 99.0%, and the selectivity of tetrahydrothiophene was 99.1%.

[0036] Example 5

[0037] A supported iron-molybdenum-rare earth element catalyst is prepared by the following steps: first, ferric sulfate, cerium sulfate, and ammonium phosphomolybdate are added to dilute hydrochloric acid, stirred in a 65°C water bath for 30 minutes, to prepare an impregnation solution in which the concentrations of ferric sulfate, cerium sulfate, and ammonium phosphomolybdate are 15 wt%, 15 wt%, and 15 wt%, respectively. Then, 16 g of powdered γ-alumina is added to 50 ml of the impregnation solution, and the mixture is impregnated in a 65°C water bath for 2 hours with stirring in an equal volume. The impregnated catalyst is dried in an 80°C drying oven for 12 hours. After drying, the catalyst is placed in a tubular furnace under a nitrogen atmosphere, calcined at 600°C for 4 hours, and naturally cooled to room temperature to obtain Catalyst 5.

[0038] The catalyst is used to catalyze the reaction of tetrahydrofuran and hydrogen sulfide to produce tetrahydrothiophene: 17.5g of the above catalyst is loaded into a fixed bed reactor (quartz material) with an inner diameter of 16mm, and the reaction is carried out under a hydrogen sulfide gas space velocity of 12h -1 The performance of the catalyst was tested under the conditions of reaction temperature of 200°C and reaction time of 18 min. Analysis of the reaction products showed that the tetrahydrofuran conversion rate of the catalyst was 99.5%, and the selectivity of tetrahydrothiophene was 99.0%.

[0039] Comparative Example 1

[0040] A catalyst for catalytic synthesis of tetrahydrothiophene is prepared by the following steps: first, cerium sulfate and ammonium phosphomolybdate are separately added to dilute sulfuric acid and stirred in a 65°C water bath for 30 minutes to prepare an impregnation solution, wherein the concentrations of cerium sulfate and ammonium phosphomolybdate are 5wt% and 5wt%, respectively. Then, 16g of powdered γ-alumina is added to 36ml of the impregnation solution, and the mixture is impregnated in a 65°C water bath with equal volumes of γ-alumina and stirred in an open bath for 2 hours. The impregnated catalyst is dried in a 90°C drying oven for 12 hours. After drying, the catalyst is calcined in a tubular furnace at 500°C for 4 hours under a nitrogen atmosphere and then naturally cooled to room temperature to obtain a comparative catalyst 1.

[0041] The catalyst is used to catalyze the reaction of tetrahydrofuran and hydrogen sulfide to produce tetrahydrothiophene: 17.5g of the above catalyst is loaded into a fixed bed reactor (quartz material) with an inner diameter of 16mm, and the reaction is carried out under a hydrogen sulfide gas space velocity of 15h -1 The performance of the catalyst was tested under the conditions of reaction temperature of 200°C and reaction time of 15 min. Analysis of the reaction products showed that the conversion rate of tetrahydrofuran was 70.2% and the selectivity of tetrahydrothiophene was 98.1%.

[0042] Comparative Example 2

[0043] A catalyst for catalytic synthesis of tetrahydrothiophene is prepared by the following steps: first, ferric sulfate and ammonium phosphomolybdate are separately added to dilute sulfuric acid and stirred in a 65°C water bath for 30 minutes to prepare an impregnation solution, wherein the concentrations of ferric sulfate and ammonium phosphomolybdate are 5 wt% and 5 wt%, respectively. Then, 16 g of powdered γ-alumina is added to 36 ml of the impregnation solution, and the mixture is impregnated in a 65°C water bath with equal volumes and stirred in an open atmosphere for 2 hours. The impregnated catalyst is dried in a 90°C drying oven for 12 hours. After drying, the catalyst is calcined in a tubular furnace at 500°C for 4 hours under a nitrogen atmosphere, and then naturally cooled to room temperature to obtain comparative catalyst 2.

[0044] The catalyst is used to catalyze the reaction of tetrahydrofuran and hydrogen sulfide to produce tetrahydrothiophene: 17.5g of the above catalyst is loaded into a fixed bed reactor (quartz material) with an inner diameter of 16mm, and the reaction is carried out under a hydrogen sulfide gas space velocity of 15h -1 The performance of the catalyst was tested under the conditions of reaction temperature of 200°C and reaction time of 15 min. Analysis of the reaction products showed that the conversion rate of tetrahydrofuran was 58.7% and the selectivity of tetrahydrothiophene was 91.9%.

[0045] Comparative Example 3

[0046] A catalyst for catalytic synthesis of tetrahydrothiophene is prepared by the following steps: first, ferric sulfate and cerium sulfate are separately added to dilute sulfuric acid and stirred in a 65°C water bath for 30 minutes to prepare an impregnation solution, wherein the concentrations of ferric sulfate and cerium sulfate are 5wt% and 5wt%, respectively. Then, 16g of powdered γ-alumina is added to 36ml of the impregnation solution, and the mixture is impregnated in a 65°C water bath with equal volumes and stirred in an open atmosphere for 2 hours. The impregnated catalyst is dried in a 90°C drying oven for 12 hours. After drying, the catalyst is calcined in a tubular furnace at 500°C for 4 hours under a nitrogen atmosphere, and then naturally cooled to room temperature to obtain comparative catalyst 3.

[0047] The catalyst is used to catalyze the reaction of tetrahydrofuran and hydrogen sulfide to produce tetrahydrothiophene: 17.5g of the above catalyst is loaded into a fixed bed reactor (quartz material) with an inner diameter of 16mm, and the reaction is carried out under a hydrogen sulfide gas space velocity of 15h -1 The performance of the catalyst was tested under the conditions of reaction temperature of 200°C and reaction time of 15 min. Analysis of the reaction products showed that the tetrahydrofuran conversion rate of the catalyst was 39.7% and the selectivity of tetrahydrothiophene was 89.2%.

[0048] Comparative Example 4

[0049] A catalyst for catalytic synthesis of tetrahydrothiophene is prepared by the following steps: first, cerium sulfate and ammonium phosphomolybdate are separately added to dilute hydrochloric acid and stirred in a 65°C water bath for 30 minutes to prepare an impregnation solution, wherein the concentrations of cerium sulfate and ammonium phosphomolybdate are 5wt% and 5wt%, respectively. Then, 16g of powdered γ-alumina is added to 50ml of the impregnation solution, and the mixture is impregnated in a 65°C water bath with equal volumes and stirred in an open atmosphere for 2 hours. The impregnated catalyst is dried in a 100°C drying oven for 12 hours. After drying, the catalyst is calcined in a tubular furnace at 600°C for 4 hours under a nitrogen atmosphere, and then naturally cooled to room temperature to obtain comparative catalyst 4.

[0050] The catalyst is used to catalyze the reaction of 1,4-butanediol and hydrogen sulfide to produce tetrahydrothiophene: 17.5g of the above catalyst is loaded into a fixed bed reactor (quartz material) with an inner diameter of 16mm, and the reaction is carried out under a hydrogen sulfide gas space velocity of 15h -1 The performance of the catalyst was tested under the conditions of reaction temperature of 180°C and reaction time of 25 min. The reaction products were analyzed and the 1,4-butanediol conversion rate of the catalyst was 68.0%, and the selectivity of tetrahydrothiophene was 87.4%.

[0051] Comparative Example 5

[0052] A catalyst for catalytic synthesis of tetrahydrothiophene is prepared by the following steps: 50 ml of a 5% by mass cerium sulfate solution and a 5% ammonium phosphomolybdate solution are mixed and stirred in a 65°C water bath for 30 minutes. First, 16 g of powdered γ-alumina is added to the cerium sulfate solution, impregnated, and dried. The mixture is then added to the ammonium phosphomolybdate solution and impregnated and dried, each drying step performed in a 90°C drying oven for 12 hours. After drying, the mixture is calcined in a tubular furnace at 600°C for 4 hours under a nitrogen atmosphere and allowed to cool naturally to room temperature to obtain comparative catalyst 5.

[0053] The catalyst is used to catalyze the reaction of 1,4-butanediol and hydrogen sulfide to produce tetrahydrothiophene: 17.5g of the above catalyst is loaded into a fixed bed reactor (quartz material) with an inner diameter of 16mm, and the reaction is carried out under a hydrogen sulfide gas space velocity of 15h -1 The performance of the catalyst was tested under the conditions of reaction temperature of 180°C and reaction time of 25 min. Analysis of the reaction products showed that the 1,4-butanediol conversion rate of the catalyst was 48.0% and the selectivity of tetrahydrothiophene was 92.5%.

[0054] Table 1 Catalyst evaluation table

[0055] Catalyst No. Conversion rate (%) Selectivity (%) Catalyst 1 99.1 99.5 Catalyst 2 99.0 99.2 Catalyst 3 99.1 99.7 Catalyst 4 99.0 99.1 Catalyst 5 99.5 99.0 Comparative Catalyst 1 70.2 98.1 Comparative Catalyst 2 58.7 91.9 Comparative Catalyst 3 39.7 89.2 Comparative Catalyst 4 68.0 87.4 Comparative Catalyst 5 48.0 92.5

[0056] As shown in Table 1, analysis of Catalyst 1 and Comparative Catalysts 1, 2, 3, and 4 demonstrates that the synergistic effect between the iron sulfate, cerium molybdenum sulfate, and ammonium phosphomolybdate in the catalysts effectively improves the conversion of tetrahydrofuran and the selectivity for tetrahydrothiophene. Analysis of Catalyst 4 and Comparative Catalysts 4 and 5 demonstrates that the impregnation method of the support also significantly affects the conversion of tetrahydrofuran and the selectivity for tetrahydrothiophene in this application. Analysis of Catalysts 1, 2, 3, 4, and 5 demonstrates that the synergistic effect between iron, molybdenum, and rare earth elements can enhance the catalytic performance of the catalysts in the direct hydrosulfurization of tetrahydrofuran.

[0057] And, by Figure 1 and Figure 2 It can be seen that Figure 1 In the figure, a is a sample prepared in comparative example 4, and b is a sample prepared in example 4. A and B are at 2.823 ppm and 1.936 ppm, respectively. Figure 1 The standard hydrogen spectrum of sample b is consistent with that of tetrahydrothiophene, but sample a also has other characteristic peaks at 3.812 ppm, proving that there are other impurities in sample a besides tetrahydrothiophene, further illustrating that the catalytic performance of comparative catalyst 4 in the reaction is much lower than that of catalyst 4.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Application of a supported iron-molybdenum-rare earth element catalyst in the catalytic synthesis of tetrahydrothiophene, characterized in that: The preparation method of the supported iron-molybdenum-rare earth element catalyst comprises: preparing an impregnation solution, wherein the raw materials of the impregnation solution include an iron salt, a molybdenum-containing compound, a rare earth-containing compound and an acid solution, adding a carrier into the impregnation solution, impregnating the carrier, and then drying the carrier, and then calcining the carrier to obtain the supported iron-molybdenum-rare earth element catalyst; The concentration of the iron salt in the impregnation solution is 1-15wt%, the concentration of the molybdenum compound is 1-15wt%, and the concentration of the rare earth compound is 1-15wt%; The iron salt is ferric sulfate; the molybdenum-containing compound is one of sodium molybdate, ammonium molybdate, cobalt molybdate, cuprous molybdate, molybdic acid, phosphomolybdic acid, ammonium phosphomolybdate, phosphotungstolybdic acid, phosphomolybdic vanadic acid, silicomolybdic acid, and silicomolybdic vanadic acid; The rare earth compound is one of lanthanum oxide, cerium sulfate, praseodymium chloride, neodymium sulfate, samarium chloride, europium oxide, gadolinium sulfate, terbium sulfate, dysprosium oxide, europium sulfate, gadolinium nitrate, terbium oxide, and dysprosium nitrate; The acid solution is one of hydrochloric acid, nitric acid, and sulfuric acid; the carrier is one of powdered γ-alumina, spherical γ-alumina, and columnar γ-alumina; The calcination step is as follows: calcination temperature is 400-700° C. under nitrogen atmosphere and heat preservation time is more than 4 hours.

2. Use of the supported iron-molybdenum-rare earth element catalyst according to claim 1 in the catalytic synthesis of tetrahydrothiophene, characterized in that: The impregnation step comprises: impregnating the carrier in an equal volume of impregnation liquid at 60° C.-90° C. and stirring for 1-24 hours; and the drying temperature is 90-120° C. and the drying time is 6-24 hours.

3. Use of the supported iron-molybdenum-rare earth element catalyst according to claim 1 in the catalytic synthesis of tetrahydrothiophene, characterized in that: Reactants A and B react to generate tetrahydrothiophene under the catalytic action of a supported iron-molybdenum-rare earth element catalyst, wherein reactant A is tetrahydrofuran or 1,4-butanediol; reactant B is hydrogen sulfide or carbon disulfide.

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