Catalytic coal gasification catalyst and preparation method thereof

Abstract

The invention relates to a coal catalytic gasification catalyst and a preparation method thereof. The coal catalytic gasification catalyst comprises a carbon-based material, organic sylvite and inorganic sylvite, wherein the organic potassium salt and the inorganic potassium salt are fixed on the carbon-based material through chemical action; the content of potassium in the organic potassium salt and the inorganic potassium salt accounts for 7-20% of the mass of the carbon-based material; the particle size of the coal catalytic gasification catalyst is 60-80 meshes. According to the invention, the organic potassium salt and the inorganic potassium salt are used as gasification catalysts, and the content of metal potassium in the organic potassium salt and the inorganic potassium salt is controlled to be 7-20%, so that the gasification performance of the prepared coal catalytic gasification catalyst is improved, and the coal catalytic gasification catalyst has good stability and high applicability.

Description

Technical Field

[0001] The invention relates to the technical field of chemical industry, and in particular to a coal catalytic gasification catalyst and a preparation method thereof. Background Art

[0002] With the continuous increase in my country's coal production and consumption, the efficient and clean use of coal has become an important issue facing Chinese researchers. Coal gasification technology is one of the key technologies for efficient and clean use of coal in the future, providing an important guarantee for the sustainable development of my country's energy.

[0003] Since the oil crisis in the last century, low-temperature catalytic gasification of coal has been a hot topic for scholars in coal chemical industry. The research on catalysts occupies an important position in coal catalytic gasification technology. Over the years, domestic and foreign scholars have found that alkali metal, alkaline earth metal and iron metal catalysts have good gasification performance for coal. Potassium carbonate is a good catalyst for coal catalytic gasification. In the 1970s, Exxon Mobil Corporation in the United States developed catalytic coal gasification technology using salts and hydroxides of alkali metals (K, Na) or alkaline earth metals (Ca), such as K2CO3 and Na2CO3-Ca(OH)2 as catalysts.

[0004] Due to the presence of clay minerals in carbon-based materials, potassium in potassium carbonate catalysts easily reacts with minerals to form water-insoluble potassium aluminosilicate (KAlSiO4), which has no activity in the coal catalytic gasification process, thereby affecting the gasification performance of the catalyst, especially for coal with high silicon and aluminum content. This effect is more obvious; at the same time, when potassium carbonate catalysts are used, the methane content in the generated gas is relatively low and the quality is poor.

[0005] Related technology discloses a catalyst suitable for fluidized bed coal catalytic gasification and its preparation method. The catalyst is a mixture of potassium carbonate and one or more other organic potassium salts, prepared by an excess impregnation method, and the active component is strongly bound to the carbon-based material and highly dispersed on the carbon-based material.

[0006] However, the coal catalytic gasification catalyst provided by the related technology has low gasification performance and poor stability and cannot meet production needs. Summary of the invention

[0007] The main purpose of the present invention is to overcome the defects of existing coal catalytic gasification catalysts and provide a new coal catalytic gasification catalyst and a preparation method thereof. The technical problem to be solved is to enable it to have higher stability and gasification performance, so that it is more suitable for practical use and has industrial utilization value.

[0008] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions.

[0009] Compared with the prior art, the present invention has obvious advantages and beneficial effects. From the above technical scheme, it can be seen that in order to achieve the above-mentioned invention purpose, the main technical contents of the present invention are as follows:

[0010] The present invention provides a coal catalytic gasification catalyst, comprising: a carbon-based material, an organic potassium salt and an inorganic potassium salt;

[0011] Wherein, the organic potassium salt and the inorganic potassium salt are fixed on the carbon-based material by chemical action;

[0012] The potassium content of the organic potassium salt and the inorganic potassium salt accounts for 7%-20% of the mass of the carbon-based material;

[0013] The particle size of the coal catalytic gasification catalyst is 60-80 meshes.

[0014] In an optional embodiment, the potassium content in the organic potassium salt and the inorganic potassium salt accounts for 10%-15% of the mass of the carbon-based material.

[0015] In an optional embodiment, the organic potassium salt includes one or more of potassium oleate, potassium formate, potassium acetate, and potassium oxalate.

[0016] In an optional embodiment, the inorganic potassium salt includes one or more of potassium carbonate, potassium sulfate, potassium nitrate, and potassium chloride.

[0017] In an optional embodiment, the mass ratio of the organic potassium salt to the inorganic potassium salt is 5-16:2-9.

[0018] In another aspect, a method for preparing a coal catalytic gasification catalyst is provided, comprising:

[0019] S101, pre-treating the raw coal, grinding the raw coal in a mortar, screening, and drying the screened raw coal to obtain a carbon-based material;

[0020] S102, dissolving the organic potassium salt in deionized water, and then impregnating the organic potassium salt solution on the carbon-based material by an equal volume impregnation method, stirring, standing, and drying to obtain an intermediate;

[0021] S103, dissolving an inorganic potassium salt in deionized water, mixing evenly, dissolving the intermediate in a solution of the inorganic potassium salt by an equal volume impregnation method, stirring, standing, drying, grinding and sieving to obtain a coal catalytic gasification catalyst.

[0022] In an optional embodiment, in step S101, the raw coal is ground and screened and then dried in an oven at a constant temperature of 105° C. to 120° C.

[0023] In an optional embodiment, in step S102, the immersion temperature is 70° C.-80° C., and the immersion time is 1 h-2 h.

[0024] In an optional embodiment, in step S103, the immersion temperature is 70° C.-80° C., and the immersion time is 1 h-2 h.

[0025] In an optional embodiment, a 60-mesh to 80-mesh sieve is used for screening in step S103.

[0026] By means of the above technical solution, the present invention (name) has at least the following advantages:

[0027] The embodiment of the present invention uses organic potassium salt and inorganic potassium salt as gasification catalysts, and controls the metal potassium content in the organic potassium salt and the inorganic potassium salt between 7% and 20%, thereby improving the gasification performance of the prepared coal catalytic gasification catalyst, and having good stability and high applicability.

[0028] The mixture of the two potassium salts gives the coal higher gasification performance.

[0029] In summary, the special coal catalytic gasification catalyst and its preparation method of the present invention overcome the defects of the existing coal catalytic gasification catalyst and provide a new coal catalytic gasification catalyst and its preparation method. It has the above-mentioned advantages and practical value, and there is no similar design published or used in the same type of coal catalytic gasification catalyst, which is indeed innovative. It has great improvements in both coal catalytic gasification catalyst and function, great progress in technology, and produces good and practical effects. It has improved multiple functions compared with the existing coal catalytic gasification catalyst, so it is more suitable for practical use and has wide industrial utilization value. It is truly a novel, progressive and practical new design.

[0030] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0031] The specific coal catalytic gasification catalyst of the present invention is given in detail by the following examples and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Attached Figure 1 A schematic flow chart of a method for preparing a coal catalytic gasification catalyst provided in an embodiment of the present invention.

[0033] Attached Figure 2 This is a schematic structural diagram of a fixed bed test evaluation device provided in an embodiment of the present invention.

[0034] Reference numerals:

[0035] 01-water inlet, 02-front pressure reducing valve, 03-mass flow meter, 04-dryer, 05-vaporizer, 06-fixed bed reactor, 07-condenser, 08-back pressure valve, 09-wet flow meter. DETAILED DESCRIPTION

[0036] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the coal catalytic gasification catalyst and the preparation method thereof proposed in accordance with the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0037] The coal catalytic gasification catalyst of the preferred embodiment of the present invention comprises: a carbon-based material, an organic potassium salt and an inorganic potassium salt;

[0038] Among them, organic potassium salts and inorganic potassium salts are fixed on carbon-based materials through chemical reactions;

[0039] The potassium content of organic potassium salt and inorganic potassium salt accounts for 7%-20% of the mass of carbon-based materials;

[0040] The particle size of the coal catalytic gasification catalyst is 60-80 mesh.

[0041] The coal catalytic gasification catalyst provided in the embodiment of the present invention uses organic potassium salt and inorganic potassium salt as gasification catalysts, and controls the metal potassium content in the organic potassium salt and the inorganic potassium salt between 7% and 20%, thereby improving the gasification performance of the prepared coal catalytic gasification catalyst, and has good stability and high applicability.

[0042] The carbon-based material in the embodiment of the present invention is obtained by pre-treating raw coal, grinding the raw coal in a mortar, screening, and drying the screened raw coal.

[0043] In an optional embodiment, the potassium content of the organic potassium salt and the inorganic potassium salt accounts for 10%-15% of the mass of the carbon-based material. Exemplarily, the potassium content of the organic potassium salt and the inorganic potassium salt can account for 10%, 11%, 12%, 13%, 14% or 15% of the mass of the carbon-based material.

[0044] In an optional embodiment, the organic potassium salt includes one or more of potassium oleate, potassium formate, potassium acetate, and potassium oxalate. Exemplarily, the organic potassium salt can be potassium oleate, potassium formate, potassium acetate, or potassium oxalate, or can be potassium oleate and potassium formate, or can be potassium acetate and potassium oxalate, or can be a mixture of potassium oleate, potassium formate, acetic acid, and / or potassium oxalate.

[0045] In an optional embodiment, the inorganic potassium salt includes one or more of potassium carbonate, potassium sulfate, potassium nitrate, and potassium chloride. Exemplarily, the inorganic potassium salt can be potassium carbonate, potassium sulfate, potassium nitrate, or potassium chloride, or can be potassium carbonate and potassium sulfate, or can be potassium nitrate and potassium chloride.

[0046] In an optional embodiment, the mass ratio of the organic potassium salt to the inorganic potassium salt is 5-16:2-9. For example, the mass ratio of the organic potassium salt to the inorganic potassium salt can be 5:2, 6:4, 5:7, 5:8, 5:9, 11:2, 13:4, 16:9, 16:5, 14:8, 15:4, etc.

[0047] On the other hand, a method for preparing a coal catalytic gasification catalyst is also provided, comprising: step S101, step S102 and step S103.

[0048] Among them, S101, pre-treating the raw coal, grinding the raw coal in a mortar, screening, and drying the screened raw coal to obtain a carbon-based material.

[0049] In step S101, the raw coal is ground and screened and then dried in an oven at a constant temperature of 105°C-120°C to obtain a carbon-based material. For example, the raw coal can be ground and screened and then dried at a constant temperature of 105°C, 106°C, 109°C, 110°C, 115°C, 116°C, 117°C, 118°C, 119°C or 120°C.

[0050] S102, after dissolving the organic potassium salt in deionized water, the organic potassium salt solution is impregnated on the carbon-based material by an equal volume impregnation method, stirred, allowed to stand, and dried to obtain an intermediate.

[0051] Wherein, the immersion temperature in step S102 is 70°C-80°C, and the immersion time is 1h-2h. Exemplarily, the immersion temperature in step S102 may be 70°C, 71°C, 72°C, 73°C, 74°C, 75°C, 76°C, 77°C, 78°C, 79°C or 80°C, etc. The immersion time may be 1h, 1.2h, 1.5h, 1.6h, 1.8h, 1.9h, 2h, etc.

[0052] S103, dissolving an inorganic potassium salt in deionized water, mixing evenly, dissolving the intermediate in a solution of the inorganic potassium salt by an equal volume impregnation method, stirring, standing, drying, grinding and sieving to obtain a coal catalytic gasification catalyst.

[0053] Wherein, the immersion temperature in step S103 is 70°C-80°C, and the immersion time is 1h-2h. And a 60-mesh sieve is used for sieving. Exemplarily, the immersion temperature in step S103 can be 70°C, 71°C, 72°C, 73°C, 74°C, 75°C, 76°C, 77°C, 78°C, 79°C or 80°C, etc. The immersion time can be 1h, 1.2h, 1.5h, 1.6h, 1.8h, 1.9h, 2h, etc.

[0054] Illustratively, the method for preparing the coal catalytic gasification catalyst provided in the embodiment of the present invention may also be carried out by the following method.

[0055] The coal powder is ground, sieved with a 60-80 mesh sieve, and dried at a constant temperature of 110°C to obtain a carbon-based material for use. Weigh 0.5-8.0g of one or more mixtures of potassium formate, potassium acetate, potassium oxalate, potassium hydrogen phthalate and potassium oleate, mix them evenly, and dissolve them in 40ml of deionized water. After fully dissolved, weigh 10g of pretreated coal powder and add it to the above solution, stir while adding, and mix thoroughly. After the addition of coal powder is completed, continue to stir for 1h, let stand at room temperature for 1-2h, and dry to obtain an intermediate. Weigh 0.2-4.5g of one or more mixtures of potassium carbonate, potassium sulfate, potassium nitrate, and potassium chloride, mix them evenly, and dissolve them in 40ml of deionized water. After fully dissolved, add the intermediate to the above solution, stir while adding, and mix thoroughly. After the addition of coal powder is completed, continue to stir for 1h, and let stand at room temperature for 1-2h. Finally, the mixture after impregnation is dried, ground and sieved to obtain a 80-100 mesh coal catalytic gasification catalyst.

[0056] The method for preparing the coal catalytic gasification catalyst provided by the present invention is further explained and illustrated by means of specific examples below.

[0057] Example 1

[0058] Weigh 8.0g potassium oleate and dissolve it in 40ml deionized water. After fully dissolving, weigh 10g pretreated coal powder (carbon-based material of the present invention) and add it to the above solution, add and stir, mix thoroughly and evenly, continue stirring for 1.0h after the addition of coal powder, let stand for 2.0h at room temperature, and dry to obtain an intermediate. Weigh 0.97g potassium carbonate, mix well, dissolve it in 40ml deionized water, and after fully dissolving, add the intermediate to the above solution, add and stir, mix thoroughly and evenly, after the addition of the intermediate, continue stirring for 1.0h, and let stand for 1.0h at room temperature. Finally, the mixture after impregnation is dried, ground and sieved to obtain a 80-100 mesh coal catalytic gasification catalyst, marked K-1.

[0059] Example 2

[0060] Weigh 2.1g of potassium formate and dissolve it in 40ml of deionized water. After it is fully dissolved, weigh 10g of pretreated carbon-based material and add it to the above solution, stir while adding, mix thoroughly and evenly. After the carbon-based material is added, continue stirring for 1.0h, let stand at room temperature for 1.5h, and dry to obtain an intermediate. Weigh 1.0g of potassium carbonate, mix well, dissolve it in 40ml of deionized water, and after it is fully dissolved, add the intermediate to the above solution, stir while adding, mix thoroughly and evenly. After the intermediate is added, continue stirring for 1.0h, and let stand at room temperature for 1.5h. Finally, the mixture after impregnation is dried, ground and sieved to obtain a 80-100 mesh coal catalytic gasification catalyst, marked as K-2.

[0061] Example 3

[0062] Weigh 4.0g of potassium oleate and dissolve it in 40ml of deionized water. After it is fully dissolved, weigh 10g of pretreated carbon-based material and add it to the above solution, stir while adding, mix thoroughly and evenly. After the carbon-based material is added, continue to stir for 1.0h, let stand at room temperature for 2.0h, and dry to obtain an intermediate. Weigh 0.96g of potassium carbonate, mix well, dissolve it in 40ml of deionized water, and after it is fully dissolved, add the intermediate to the above solution, stir while adding, mix thoroughly and evenly. After the intermediate is added, continue to stir for 1.0h, and let stand at room temperature for 1.5h. Finally, the mixture after impregnation is dried, ground and sieved to obtain a 80-100 mesh coal catalytic gasification catalyst, marked as K-3.

[0063] Example 4

[0064] Weigh 3.0g potassium oleate and 0.5g potassium acetate and dissolve them in 40ml deionized water. After fully dissolved, weigh 10g pretreated coal powder and add it to the above solution, stir while adding, mix thoroughly and evenly. After the addition of coal powder is completed, continue stirring for 1.0h, let stand at room temperature for 2.0h, and dry to obtain an intermediate. Weigh 0.5g potassium sulfate, mix well, dissolve it in 40ml deionized water, and after fully dissolved, add the intermediate to the above solution, stir while adding, mix thoroughly and evenly. After the addition of coal powder is completed, continue stirring for 1.0h, and let stand at room temperature for 2.0h. Finally, the mixture after impregnation is dried, ground and sieved to obtain a 80-100 mesh coal catalytic gasification catalyst, marked as K-4.

[0065] Example 5

[0066] Weigh 2.0g potassium oleate and 1.0g potassium acetate and dissolve them in 40ml deionized water. After fully dissolved, weigh 10g pretreated coal powder and add it to the above solution, stir while adding, mix thoroughly and evenly. After the addition of coal powder is completed, continue stirring for 1.0h, let stand at room temperature for 2.0h, and dry to obtain an intermediate. Weigh 1.0g potassium carbonate, mix well, dissolve it in 40ml deionized water, and after fully dissolved, add the intermediate to the above solution, stir while adding, mix thoroughly and evenly. After the addition of the intermediate is completed, continue stirring for 1.0h, and let stand at room temperature for 2.0h. Finally, the mixture after impregnation is dried, ground and sieved to obtain a 80-100 mesh coal catalytic gasification catalyst, marked K-5.

[0067] Example 6

[0068] Weigh 0.5g potassium formate and 0.5g potassium acetate and dissolve them in 40ml deionized water. After fully dissolved, weigh 10g pretreated coal powder and add it to the above solution, stir while adding, mix thoroughly and evenly. After the coal powder is added, continue stirring for 1.0h, let stand at room temperature for 2.0h, and dry to obtain an intermediate. Weigh 0.5g potassium carbonate, mix well, dissolve it in 40ml deionized water, and after fully dissolved, add the intermediate to the above solution, stir while adding, mix thoroughly and evenly. After the intermediate is added, continue stirring for 1.0h, and let stand at room temperature for 2.0h. Finally, the mixture after impregnation is dried, ground and sieved to obtain a 80-100 mesh coal catalytic gasification catalyst, marked K-6.

[0069] Example 7

[0070] Weigh 1.0g potassium acetate and dissolve it in 40ml deionized water. After fully dissolved, weigh 10g pretreated coal powder and add it to the above solution, stir while adding, mix thoroughly and evenly. After the addition of coal powder is completed, continue to stir for 1.0h, let stand at room temperature for 2.0h, and dry to obtain an intermediate. Weigh 0.5g potassium carbonate, mix well, dissolve it in 40ml deionized water, and after fully dissolved, add the intermediate to the above solution, stir while adding, mix thoroughly and evenly. After the addition of the intermediate is completed, continue to stir for 1.0h, and let stand at room temperature for 2.0h. Finally, the mixture after impregnation is dried, ground and sieved to obtain a 80-100 mesh coal catalytic gasification catalyst, marked as K-7.

[0071] Example 8

[0072] Weigh 8.0g potassium oleate and dissolve it in 40ml deionized water. After fully dissolved, weigh 10g pretreated coal powder and add it to the above solution, stir while adding, mix thoroughly and evenly. After the addition of coal powder is completed, continue to stir for 1.0h, let stand at room temperature for 2.0h, and dry to obtain an intermediate. Weigh 1.6g potassium carbonate, mix well, dissolve it in 40ml deionized water, and after fully dissolved, add the intermediate to the above solution, stir while adding, mix thoroughly and evenly. After the addition of the intermediate is completed, continue to stir for 1.0h, and let stand at room temperature for 1.0h. Finally, the mixture after impregnation is dried, ground and sieved to obtain a 80-100 mesh coal catalytic gasification catalyst, marked K-8.

[0073] Comparative Example 1

[0074] Weigh 2.0g potassium carbonate and dissolve it in 40ml deionized water. After it is fully dissolved, weigh 10g pretreated coal powder and add it to the above solution. Stir while adding to mix thoroughly. After the addition of coal powder, continue stirring for 1.0h, let it stand at room temperature for 2.0h, dry, grind and sieve to obtain 80-100 mesh particles, marked as K-9.

[0075] Comparative Example 2

[0076] Weigh 2.7g potassium carbonate and dissolve it in 40ml deionized water. After it is fully dissolved, weigh 10g pretreated coal powder and add it to the above solution. Stir while adding to mix thoroughly. After the coal powder is added, continue stirring for 1.0h, let it stand at room temperature for 1.0h, dry, grind, and sieve to obtain 80-100 mesh particles, marked as K-10.

[0077] Coal catalytic gasification catalyst performance evaluation conditions: Figure 2 The fixed bed test device was used in the experiment, with gasification temperature of 700℃, gasification pressure of 3.5Mpa, initial coal-water mass ratio of 2g / g·min-1, and carrier gas flow rate of 100ml / min.

[0078] Water enters the vaporizer 05 through the water inlet 01 for vaporization and then enters the fixed bed reactor 06. The front end of the vaporizer 05 is provided with a dryer 04, the front end of the dryer 04 is provided with a mass flow meter 03, and the front end of the mass flow meter 03 is provided with a front pressure reducing valve 02, which is used to control the pressure of the vaporizer 05. The gas at the bottom of the fixed bed reactor 06 enters the condenser 07 for condensation, passes through the back pressure valve 08 and the wet flow meter, and part of the gas is emptied, and part of the gas is subjected to chromatographic online analysis.

[0079] Under the same test conditions, the performance test was conducted on the lignite gasification raw material of the embodiment and the comparative example gasification raw material, the water vapor was metered by the water inlet metering pump, the product gas volume was measured by the wet flow meter, and the product gas composition was analyzed by Agilent chromatography online. The specific analysis data are shown in Table 1 and Table 2.

[0080] Table 1 Coal gasification reaction conversion rate of the catalyst of the present invention and the comparative catalyst at different reaction times (%)

[0081]

[0082]

[0083] It can be seen from the data in Table 1 that in the coal catalytic gasification reaction, under the same experimental conditions, the gasification rate of the coal catalytic gasification catalyst prepared according to the method of the present invention is better than that of the coal catalytic gasification catalyst prepared using the potassium carbonate catalyst in the comparative example. The gasification time of the coal catalytic gasification catalyst prepared according to the method of the present invention is almost completed in 200 minutes, while the gasification time of the gasification catalyst using the potassium carbonate catalyst in the comparative example is significantly prolonged. During the entire gasification process, the reaction rate is slow, and the gasification process can only be completed after 270 minutes.

[0084] Table 2 Methane production in coal gasification reaction of the catalyst of the present invention and the comparative catalyst (mmol / gcoal)

[0085] catalyst K-1 K-2 K-3 K-4 K-5 K-6 K-7 K-8 K-9 K-10 Methane production 11.2 10.9 10.7 10.0 10.2 10.1 10.3 10.5 9.5 9.3

[0086] It can be seen from the data in Table 2 that in the coal catalytic gasification reaction, under the same experimental conditions, the added production amount of the gasification product of the coal catalytic gasification catalyst prepared according to the method of the present invention is better than that of the gasification catalyst prepared by the potassium carbonate catalyst in the comparative example. The average added production amount in the gasification product gas of the coal catalytic gasification catalyst prepared according to the method of the present invention is 10.475 mmol / gcoal, while the average added production amount in the gasification product gas of the coal gasification raw material prepared by the comparative method is 9.5 mmol / gcoal. The production amount of methane in the product increased by 10% year-on-year (compared with the potassium carbonate catalyst), and the present invention shows excellent methane production performance.

[0087] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A coal catalytic gasification catalyst, characterized in that: include: Carbon-based materials, organic potassium salts and inorganic potassium salts; Wherein, the organic potassium salt and the inorganic potassium salt are fixed on the carbon-based material by chemical action; The potassium content of the organic potassium salt and the inorganic potassium salt accounts for 7%-20% of the mass of the carbon-based material; The particle size of the coal catalytic gasification catalyst is 60-80 meshes.

2. The coal catalytic gasification catalyst according to claim 1, characterized in that: The potassium content in the organic potassium salt and the inorganic potassium salt accounts for 10%-15% of the mass of the carbon-based material.

3. The coal catalytic gasification catalyst according to claim 1, characterized in that: The organic potassium salt includes one or more of potassium oleate, potassium formate, potassium acetate and potassium oxalate.

4. The coal catalytic gasification catalyst according to claim 1, characterized in that: The inorganic potassium salt includes one or more of potassium carbonate, potassium sulfate, potassium nitrate and potassium chloride.

5. The coal catalytic gasification catalyst according to claim 1, characterized in that: The mass ratio of the organic potassium salt to the inorganic potassium salt is 5-16:2-9.

6. A method for preparing a coal catalytic gasification catalyst, characterized in that: include: S101, pre-treating the raw coal, grinding the raw coal in a mortar, screening, and drying the screened raw coal to obtain a carbon-based material; S102, dissolving the organic potassium salt in deionized water, and then impregnating the organic potassium salt solution on the carbon-based material by an equal volume impregnation method, stirring, standing, and drying to obtain an intermediate; S103, dissolving an inorganic potassium salt in deionized water, mixing evenly, dissolving the intermediate in a solution of the inorganic potassium salt by an equal volume impregnation method, stirring, standing, drying, grinding and sieving to obtain a coal catalytic gasification catalyst.

7. The method for preparing a coal catalytic gasification catalyst according to claim 6, characterized in that: In step S101, the raw coal is ground and screened and then dried in an oven at a constant temperature of 105°C-120°C.

8. The method for preparing a coal catalytic gasification catalyst according to claim 6, characterized in that: In step S102, the immersion temperature is 70°C-80°C, and the immersion time is 1h-2h.

9. The method for preparing a coal catalytic gasification catalyst according to claim 6, characterized in that: In step S103, the immersion temperature is 70° C.-80° C., and the immersion time is 1 h-2 h.

10. The method for preparing a coal catalytic gasification catalyst according to claim 6, characterized in that: In step S103, a 60-mesh to 80-mesh sieve is used for screening.

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