Cobalt-based catalyst and preparation method and application thereof

Abstract

The invention discloses a cobalt-based catalyst and a preparation method and application thereof. Comprising a cobalt element and an alkali metal element; the cobalt element exists in the form of a simple substance, cobalt oxide or cobalt carbide; the alkali metal element is selected from at least one of Li, Na, K, Rb and Cs; the alkali metal element exists in the form of a simple substance; in the cobalt-based catalyst, the total mass of the metal elements is 100 wt%, the content of the cobalt element is 50-99.5 wt%, and the balance is alkali metal elements. The catalyst has high activity and oxygen-containing compound selectivity in Fischer-Tropsch synthesis. The phenomenon of low selectivity of the oxygen-containing compound in Fischer-Tropsch synthesis is effectively solved, and an effective way is provided for improving the selectivity of the oxygen-containing compound.

Description

Technical Field

[0001] This application relates to a cobalt-based catalyst, its preparation method, and its application, belonging to the field of chemical engineering. Background Technology

[0002] Oxygenated compounds are important fine chemical raw materials, mainly used in the synthesis of surfactants, plasticizers, detergents, and other fine chemicals. These products have wide applications in textiles, papermaking, pharmaceuticals, and leather. Early production of oxygenated compounds primarily used vegetable and animal oils as raw materials, but with the development of the petrochemical industry, the production route using petroleum as the main raw material has gradually become mainstream. In recent years, methods for synthesizing oxygenated compounds mainly include natural oil routes and methods using ethylene and paraffin as raw materials. The Fischer-Tropsch synthesis technology can use widely available syngas as a raw material, derived from natural gas, coal, and biomass. The Fischer-Tropsch synthesis technology, also known as CO hydrogenation, refers to the reaction of producing hydrocarbons through chain growth using syngas (CO and H2) as raw materials under the action of a catalyst. It is an important non-petroleum route for synthesizing clean fuels and chemical products, with raw materials mainly derived from the conversion of coal, natural gas, and biomass. Since my country has richer coal reserves than natural gas, coal is the primary raw material for Fischer-Tropsch synthesis in my country. Different catalysts, processes, and engineering methods in Fischer-Tropsch synthesis lead to fundamental differences in product distribution and types. High-temperature Fischer-Tropsch synthesis (HTFT, 300–350°C) primarily produces gasoline and olefins, while low-temperature Fischer-Tropsch synthesis (LTFT, 220–250°C) mainly produces diesel, long-chain alkanes, Fischer-Tropsch waxes, and lubricating oil base feedstocks. Fischer-Tropsch synthesis products follow the ASF distribution, resulting in a relatively wide product range (C1-C100). Currently, high-value-added products such as low-carbon olefins, high / low-carbon alcohols, α-olefins, gasoline, aviation kerosene, and diesel are mainly produced through downstream hydrogenation and separation processes. However, directly preparing oxygen-containing compounds via Fischer-Tropsch synthesis still presents significant challenges, primarily due to the low selectivity of oxygen-containing compounds. Designing highly efficient catalysts is the main approach to improving the yield of oxygen-containing compounds. Summary of the Invention

[0003] According to one aspect of this application, a cobalt carbide catalyst is provided, which exhibits high activity and selectivity in the Fischer-Tropsch synthesis for the preparation of oxygen-containing compounds. This cobalt carbide catalyst has a favorable single-crystal structure, and the particle size is adjustable according to the catalyst preparation conditions, resulting in uniform cobalt carbide particle size. Specific crystal facets of the cobalt carbide crystals exhibit high activity and specific selectivity in the Fischer-Tropsch synthesis, thereby regulating the product distribution of the Fischer-Tropsch synthesis and improving the selectivity for oxygen-containing compounds.

[0004] According to one aspect of this application, a cobalt-based catalyst is provided, the cobalt-based catalyst comprising cobalt and an alkali metal element;

[0005] The cobalt element exists in the form of elemental form, cobalt oxide, or cobalt carbide.

[0006] The alkali metal element is selected from at least one of Li, Na, K, Rb, and Cs;

[0007] The alkali metal elements exist in elemental form;

[0008] In the cobalt-based catalyst, the total mass of metal elements is 100 wt%, of which the content of cobalt element is 50-99.5 wt%, and the remainder is alkali metal elements.

[0009] According to another aspect of this application, a method for preparing the above-mentioned cobalt-based catalyst is provided, comprising the following steps:

[0010] (1) Mix an aqueous solution containing a cobalt source with a precipitant, precipitate, age, filter, and wash until the pH of the filtrate is in the range of 6 to 8 to obtain a catalyst precursor.

[0011] (2) The catalyst precursor is mixed with an aqueous solution containing an alkali metal source, dried, calcined, and treated with syngas to obtain the cobalt-based catalyst.

[0012] The cobalt source is selected from at least one of cobalt nitrate, cobalt sulfate, and cobalt chloride;

[0013] The precipitant is selected from at least one of ammonia water, sodium carbonate aqueous solution, potassium carbonate aqueous solution, and ammonium carbonate aqueous solution;

[0014] The precipitation temperature is 10–95°C;

[0015] The pH of the precipitate is 7–11;

[0016] The aging temperature is 5–95°C;

[0017] The aging time is 0.5 to 100 hours.

[0018] The alkali metal source is selected from at least one of water-soluble metal salts of Li, Na, K, Rb, and Cs;

[0019] The drying temperature is 5–150°C;

[0020] The drying time is 1 to 100 hours;

[0021] The roasting temperature is 150–1000℃;

[0022] The roasting time is 0.5 to 50 hours;

[0023] The roasting atmosphere is an air atmosphere, an oxygen-containing atmosphere, a nitrogen atmosphere, or an inert gas atmosphere.

[0024] The atmosphere for the syngas treatment is a mixture of hydrogen and carbon monoxide, wherein the volume ratio of hydrogen to carbon monoxide is 0.1 to 100.

[0025] The temperature for the synthesis gas treatment is 80–600°C;

[0026] The synthesis gas treatment time is 0.5 to 100 hours.

[0027] According to another aspect of this application, a method for preparing oxygen-containing compounds by hydrogenation of CO is provided, comprising the following steps:

[0028] In a reactor, raw materials containing hydrogen and CO are brought into contact with a catalyst and reacted to obtain oxygen-containing compounds; this is known as Fischer-Tropsch synthesis for the preparation of oxygen-containing compounds.

[0029] The catalyst is the cobalt-based catalyst described above;

[0030] The oxygen-containing compounds include alcohols with more than 6 carbon atoms.

[0031] The reaction temperature is 150–450°C;

[0032] The reaction pressure is 0.1–8 MPa.

[0033] The volume ratio of hydrogen to CO is 0.2 to 8;

[0034] The gas space velocity (GHSV) of the raw material is 200–20000 h⁻¹. -1 .

[0035] The beneficial effects that this application can produce include:

[0036] (1) The cobalt carbide catalyst provided in this application has both high activity and selectivity for oxygen-containing compounds in Fischer-Tropsch synthesis.

[0037] (2) The cobalt carbide catalyst provided in this application effectively solves the problem of low selectivity of oxygen-containing compounds in Fischer-Tropsch synthesis, and provides an effective way to improve the selectivity of oxygen-containing compounds.

[0038] (3) The cobalt carbide catalyst provided in this application has a good single crystal structure, and the particle size can be adjusted according to the catalyst preparation conditions. The cobalt carbide particle size is uniform. The specific crystal facets of cobalt carbide crystals have high activity and special selectivity in Fischer-Tropsch synthesis, thereby regulating the product distribution of Fischer-Tropsch synthesis and improving the selectivity of oxygen-containing compounds. Detailed Implementation

[0039] The reaction products were analyzed by online gas chromatography. The gas chromatograph was an Agilent 7890A, using a TCD and FID detector. TCD analysis used a packed column TDX-01 (2m × 2mm) with high-purity helium as the carrier gas; FID analysis used a capillary column HP-PLOT / Q (30m × 0.32mm). Column temperature was programmed: the temperature was increased from 40℃ to 150℃ at a rate of 20℃ / min, held for 5 min, then increased to 240℃ at a rate of 30℃ / min, and held for 5 min.

[0040] Example 1: Preparation of catalyst sample

[0041] 20.0 g of cobalt nitrate hexahydrate was dissolved in 200 ml of deionized water to obtain solution I. The coprecipitant was 25% ammonia solution. Solution I and the coprecipitant were continuously mixed in a co-current flow manner, controlling the mixing ratio to maintain the pH of the solution at 7. The temperature was maintained at 20°C during coprecipitation, with continuous stirring throughout the process. After coprecipitation, the mixture was aged at 30°C for 10 h, filtered, and washed with deionized water until neutral. The filter cake was then re-slurryed with 190 g of 1 wt% potassium carbonate solution (solution II) to obtain mixture I. Mixture I was dried at 50°C for 12 h, then calcined at 500°C in air for 10 h. Finally, it was treated at 500°C in a syngas (H2 / CO = 2) atmosphere for 10 h. This yielded the desired catalyst, denoted as sample C1. # .

[0042] Example 2 Preparation of catalyst samples

[0043] 20.0 g of cobalt nitrate hexahydrate was dissolved in 200 ml of deionized water to obtain solution I. The coprecipitant was 30% sodium carbonate (w / w). Solution I and the coprecipitant were continuously mixed in a co-current flow manner, controlling the mixing ratio to maintain the pH at 8. The temperature was maintained at 50°C during coprecipitation, with continuous stirring throughout the process. After coprecipitation, the mixture was aged at 5°C for 100 h, filtered, and washed with deionized water until neutral. The filter cake was then re-slurried with 50 g of 5 wt% potassium carbonate solution (solution II) to obtain mixture I. Mixture I was dried at 20°C for 100 h, then calcined at 300°C in a nitrogen atmosphere for 50 h. Finally, it was treated at 600°C in a syngas atmosphere (H2 / CO = 0.5) for 50 h. This yielded the desired catalyst, denoted as sample C2. # .

[0044] Example 3 Preparation of catalyst samples

[0045] 20.0 g of cobalt nitrate hexahydrate was dissolved in 200 ml of deionized water to obtain solution I. The coprecipitant was 40% ammonium carbonate (w / w). Solution I and the coprecipitant were continuously mixed in a co-current flow, controlling the mixing ratio to maintain the pH at 10. The temperature was maintained at 10°C during coprecipitation, with continuous stirring throughout the process. After coprecipitation, the mixture was aged at 95°C for 0.5 h, filtered, and washed with deionized water until neutral. The filter cake was then re-slurried with 0.01 g of 50 wt% potassium carbonate solution (solution II) to obtain mixture I. Mixture I was dried at 150°C for 1 h, then calcined at 1000°C in a helium atmosphere for 0.5 h. Finally, it was treated at 80°C in a syngas atmosphere (H2 / CO = 100) for 100 h. This yielded the desired catalyst, denoted as sample C3. # .

[0046] Example 4 Preparation of catalyst sample

[0047] 20.0 g of cobalt nitrate hexahydrate was dissolved in 200 ml of deionized water to obtain solution I. The coprecipitant was 10% potassium carbonate (w / w). Solution I and the coprecipitant were continuously mixed in a co-current flow manner, controlling the mixing ratio to maintain the pH of the solution at 11. The temperature was maintained at 60°C during coprecipitation, with continuous stirring throughout the process. After coprecipitation, the mixture was aged at 70°C for 80 h, filtered, and washed with deionized water until neutral. The filter cake was then re-slurried with 150 g of 0.005 wt% potassium carbonate solution (solution II) to obtain mixture I. Mixture I was dried at 80°C for 40 h, then calcined at 700°C in a nitrogen atmosphere for 30 h. Finally, it was treated at 200°C in a syngas atmosphere (H2 / CO = 60) for 80 h. This yielded the desired catalyst, denoted as sample C4. # .

[0048] Example 5 Preparation of catalyst sample

[0049] 20.0 g of cobalt nitrate hexahydrate was dissolved in 200 ml of deionized water to obtain solution I. The coprecipitant was 50% sodium carbonate (w / w). Solution I and the coprecipitant were continuously mixed in a co-current flow, controlling the mixing ratio to maintain the pH at 10. The temperature was maintained at 60°C during coprecipitation, with continuous stirring throughout the process. After coprecipitation, the mixture was aged at 80°C for 30 h, filtered, and washed with deionized water until neutral. The filter cake was then re-slurried with 0.2 g of 30 wt% potassium carbonate solution (solution II) to obtain mixture I. Mixture I was dried at 90°C for 16 h, then calcined at 400°C in an argon atmosphere for 40 h. Finally, it was treated at 200°C in a syngas atmosphere (H2 / CO = 40) for 50 h. This yielded the desired catalyst, denoted as sample C5. # .

[0050] Example 6 Preparation of catalyst sample

[0051] 20.0 g of cobalt nitrate hexahydrate was dissolved in 200 ml of deionized water to obtain solution I. The coprecipitant was 15% sodium carbonate (w / w). Solution I and the coprecipitant were continuously mixed in a co-current flow manner, controlling the mixing ratio to maintain the pH at 8. The temperature was maintained at 50°C during coprecipitation, with continuous stirring throughout the process. After coprecipitation, the mixture was aged at 70°C for 60 h, filtered, and washed with deionized water until neutral. The filter cake was then re-slurried with 3 g of 15 wt% potassium carbonate solution (solution II) to obtain mixture I. Mixture I was dried at 120°C for 44 h, then calcined at 700°C in a helium atmosphere for 20 h. Finally, it was treated at 300°C in a syngas atmosphere (H2 / CO = 50) for 30 h. This yielded the desired catalyst, denoted as sample C6. # .

[0052] Example 7 Preparation of catalyst sample

[0053] 20.0 g of cobalt nitrate hexahydrate was dissolved in 200 ml of deionized water to obtain solution I. The coprecipitant was 10% potassium carbonate (w / w). Solution I and the coprecipitant were continuously mixed in a co-current flow manner, controlling the mixing ratio to maintain the pH of the solution at 9. The temperature was maintained at 70°C during coprecipitation, with continuous stirring throughout the process. After coprecipitation, the mixture was aged at 60°C for 70 h, filtered, and washed with deionized water until neutral. The filter cake was then re-slurried with 60 g of 3 wt% potassium carbonate solution (solution II) to obtain mixture I. Mixture I was dried at 70°C for 60 h, then calcined at 200°C in a helium atmosphere for 30 h. Finally, it was treated at 400°C in a syngas atmosphere (H2 / CO = 50) for 70 h. This yielded the desired catalyst, denoted as sample C7. # .

[0054] Example 8 Preparation of catalyst sample

[0055] 20.0 g of cobalt nitrate hexahydrate was dissolved in 200 ml of deionized water to obtain solution I. The coprecipitant was 50% sodium carbonate (w / w). Solution I and the coprecipitant were continuously mixed in a co-current flow, controlling the mixing ratio to maintain the pH at 9. The temperature was maintained at 40°C during coprecipitation, with continuous stirring throughout the process. After coprecipitation, the mixture was aged at 70°C for 60 h, filtered, and washed with deionized water until neutral. The filter cake was then re-slurried with 0.05 g of 30 wt% potassium carbonate solution (solution II) to obtain mixture I. Mixture I was dried at 70°C for 46 h, then calcined at 900°C in air for 3 h. Finally, it was treated at 400°C in a syngas atmosphere (H2 / CO = 60) for 90 h. This yielded the desired catalyst, denoted as sample C8. # .

[0056] Example 9 Preparation of catalyst sample

[0057] 20.0 g of cobalt nitrate hexahydrate was dissolved in 200 ml of deionized water to obtain solution I. The coprecipitant was 25% ammonia solution (w / w). Solution I and the coprecipitant were continuously mixed in a co-current flow manner, controlling the mixing ratio to maintain the pH of the solution at 8. The temperature was maintained at 70°C during coprecipitation, with continuous stirring throughout the process. After coprecipitation, the mixture was aged at 60°C for 80 h, filtered, and washed with deionized water until neutral. The filter cake was then re-slurryed with 40 g of 0.5 wt% potassium carbonate solution (solution II) to obtain mixture I. Mixture I was dried at 60°C for 40 h, then calcined at 300°C in air for 20 h. Finally, it was treated at 200°C in a syngas atmosphere (H2 / CO = 60) for 90 h. This yielded the desired catalyst, denoted as sample C9. # .

[0058] Example 10 Preparation of catalyst sample

[0059] 20.0 g of cobalt nitrate hexahydrate was dissolved in 200 ml of deionized water to obtain solution I. The coprecipitant was 25% ammonia solution. Solution I and the coprecipitant were continuously mixed in a co-current flow manner, controlling the mixing ratio to maintain the pH of the solution at 10. The temperature was maintained at 70℃ during the coprecipitation process, with continuous stirring throughout. After coprecipitation, the mixture was aged at 60℃ for 50 h, filtered, and washed with deionized water until neutral. The filter cake was then re-slurried with 20 g of 8 wt% potassium carbonate solution (solution II) to obtain mixture I. Mixture I was dried at 60℃ for 36 h, then calcined at 800℃ in a nitrogen atmosphere for 30 h. Finally, it was treated at 200℃ in a syngas atmosphere (H2 / CO = 70) for 50 h. The desired catalyst was thus obtained, denoted as sample C10. # .

[0060] Example 11 Preparation of catalyst sample

[0061] 20.0 g of cobalt nitrate hexahydrate was dissolved in 200 ml of deionized water to obtain solution I. The coprecipitant was 15% ammonium carbonate (w / w). Solution I and the coprecipitant were continuously mixed in a co-current flow, controlling the mixing ratio to maintain the pH at 10. The temperature was maintained at 60°C during coprecipitation, with continuous stirring throughout the process. After coprecipitation, the mixture was aged at 50°C for 50 h, filtered, and washed with deionized water until neutral. The filter cake was then re-slurried with 50 g of 3 wt% potassium carbonate solution (solution II) to obtain mixture I. Mixture I was dried at 60°C for 40 h, then calcined at 700°C in air for 30 h. Finally, it was treated at 400°C in a syngas (H2 / CO = 3) atmosphere for 50 h. This yielded the desired catalyst, denoted as sample C11. # .

[0062] Example 12 Preparation of catalyst sample

[0063] 20.0 g of cobalt nitrate hexahydrate was dissolved in 200 ml of deionized water to obtain solution I. The coprecipitant was 25% ammonia solution. Solution I and the coprecipitant were continuously mixed in a co-current flow manner, controlling the mixing ratio to maintain the pH of the solution at 8. The temperature was maintained at 60℃ during the coprecipitation process, with continuous stirring throughout. After coprecipitation, the mixture was aged at 50℃ for 70 h, filtered, and washed with deionized water until neutral. The filter cake was then re-slurried with 20 g of 2 wt% potassium carbonate solution (solution II) to obtain mixture I. Mixture I was dried at 70℃ for 80 h, then calcined at 600℃ in a nitrogen atmosphere for 20 h. Finally, it was treated at 400℃ in a syngas atmosphere (H2 / CO = 4) for 20 h. This yielded the desired catalyst, denoted as sample C12. # .

[0064] Example 13 Preparation of catalyst sample

[0065] 20.0 g of cobalt nitrate hexahydrate was dissolved in 200 ml of deionized water to obtain solution I. The coprecipitant was 10% sodium carbonate (w / w). Solution I and the coprecipitant were continuously mixed in a co-current flow, controlling the mixing ratio to maintain the pH at 9. The temperature was maintained at 30°C during coprecipitation, with continuous stirring throughout the process. After coprecipitation, the mixture was aged at 50°C for 60 h, filtered, and washed with deionized water until neutral. The filter cake was then re-slurried with 5 g of 10 wt% potassium carbonate solution (solution II) to obtain mixture I. Mixture I was dried at 70°C for 20 h, then calcined at 200°C in a helium atmosphere for 20 h. Finally, it was treated at 300°C in a syngas atmosphere (H2 / CO = 70) for 50 h. This yielded the desired catalyst, denoted as sample C13. # .

[0066] Example 14 Preparation of catalyst sample

[0067] 20.0 g of cobalt nitrate hexahydrate was dissolved in 200 ml of deionized water to obtain solution I. The coprecipitant was 25% ammonia solution (w / w). Solution I and the coprecipitant were continuously mixed in a co-current flow manner, controlling the mixing ratio to maintain the pH of the solution at 9. The temperature was maintained at 30°C during coprecipitation, with continuous stirring throughout the process. After coprecipitation, the mixture was aged at 60°C for 70 h, filtered, and washed with deionized water until neutral. The filter cake was then re-slurried with 20 g of 1 wt% potassium carbonate solution (solution II) to obtain mixture I. Mixture I was dried at 70°C for 45 h, then calcined at 600°C in air for 20 h. Finally, it was treated at 400°C in a syngas atmosphere (H2 / CO = 50) for 60 h. This yielded the desired catalyst, denoted as sample C14. # .

[0068] Example 15 Preparation of catalyst sample

[0069] 20.0 g of cobalt nitrate hexahydrate was dissolved in 200 ml of deionized water to obtain solution I. The coprecipitant was sodium carbonate with a mass percentage concentration of 40%. Solution I and the coprecipitant were continuously mixed in a co-current flow manner, controlling the mixing ratio to maintain the pH of the solution at 8. The temperature was maintained at 60℃ during the coprecipitation process, with continuous stirring throughout. After coprecipitation, the mixture was aged at 50℃ for 70 h, filtered, and washed with deionized water until neutral. The filter cake was then re-slurried with 50 g of 0.7 wt% potassium carbonate solution (solution II) to obtain mixture I. Mixture I was dried at 70℃ for 50 h, then calcined at 700℃ in air for 2 h. Finally, it was treated at 200℃ in a syngas atmosphere (H2 / CO = 50) for 30 h. The desired catalyst was thus obtained, denoted as sample C15. # .

[0070] Example 16 Sample C1 # —Sample C15 # Performance testing of CO hydrogenation to prepare oxygen-containing compounds

[0071] 2g of sample was loaded into the reaction tube, and the catalyst was kept in a constant temperature zone using a liner, quartz wool, and quartz sand. The reaction tube was then placed in a fixed-bed apparatus, with the thermocouple positioned in the catalyst bed. The reaction conditions are shown in Table 1. Simultaneously, the valve box temperature, pipeline insulation, and chromatographic pipeline insulation were set to 150℃. The reaction products were analyzed online every 30 minutes. The reaction results are shown in Table 2.

[0072] Table 1 Reaction conditions for the preparation of oxygen-containing compounds by CO hydrogenation.

[0073]

[0074] Table 2 Results of CO hydrogenation for the preparation of oxygen-containing compounds

[0075]

[0076]

[0077] The above description is merely a few embodiments of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A cobalt-based catalyst, characterized in that, The cobalt-based catalyst includes cobalt and alkali metal elements; The cobalt element exists in the form of elemental form, cobalt oxide, or cobalt carbide. The alkali metal element is selected from at least one of Li, Na, K, Rb, and Cs; The alkali metal elements exist in elemental form; In the cobalt-based catalyst, the total mass of metal elements is 100 wt%, of which the content of cobalt element is 50-99.5 wt%, and the remainder is alkali metal elements.

2. A method for preparing the cobalt-based catalyst according to claim 1, characterized in that, Includes the following steps: (1) Mix an aqueous solution containing a cobalt source with a precipitant, precipitate, age, filter, and wash to obtain a catalyst precursor; (2) The catalyst precursor is mixed with an aqueous solution containing an alkali metal source, dried, calcined, and treated with syngas to obtain the cobalt-based catalyst.

3. The preparation method according to claim 2, characterized in that, The cobalt source is selected from at least one of cobalt nitrate, cobalt sulfate, and cobalt chloride; The precipitant is selected from at least one of ammonia water, sodium carbonate aqueous solution, potassium carbonate aqueous solution, and ammonium carbonate aqueous solution; The precipitation temperature is 10–95°C; The pH of the precipitate is 7–11; The aging temperature is 5–95°C; The aging time is 0.5 to 100 hours.

4. The preparation method according to claim 2, characterized in that, The alkali metal source is selected from at least one of water-soluble metal salts of Li, Na, K, Rb, and Cs; The drying temperature is 5–150°C; The drying time is 1 to 100 hours; The roasting temperature is 150–1000℃; The roasting time is 0.5 to 50 hours; The roasting atmosphere is an air atmosphere, an oxygen-containing atmosphere, a nitrogen atmosphere, or an inert gas atmosphere.

5. The preparation method according to claim 2, characterized in that, The atmosphere for the syngas treatment is a mixture of hydrogen and carbon monoxide, wherein the volume ratio of hydrogen to carbon monoxide is 0.1 to 100. The temperature for the synthesis gas treatment is 80–600°C; The synthesis gas treatment time is 0.5 to 100 hours.

6. A method for preparing oxygen-containing compounds by hydrogenation of CO, characterized in that, Includes the following steps: In a reactor, raw materials containing hydrogen and CO are brought into contact with a catalyst and reacted to obtain oxygen-containing compounds. The catalyst is the cobalt-based catalyst according to claim 1.

7. The method according to claim 6, characterized in that, The reaction temperature is 150–450°C; The reaction pressure is 0.1–8 MPa.

8. The method according to claim 6, characterized in that, The volume ratio of hydrogen to CO is 0.2 to 8; The gas space velocity (GHSV) of the raw material is 200–20000 h⁻¹. -1 .

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