Ethylene oxide catalyst and preparation method therefor

Abstract

The present invention relates to the technical field of catalyst preparation, and provides an ethylene oxide catalyst and a preparation method therefor. The preparation method for the ethylene oxide catalyst comprises the following steps: acquiring an alumina carrier; acquiring an impregnation solution containing a silver active component, an alkali metal auxiliary agent and a rare earth metal auxiliary agent; loading the impregnation solution onto the alumina carrier by means of a double cone impregnation method, so as to obtain a catalyst intermediate; and activating the catalyst intermediate by means of a vibro-activation method, so as to obtain the ethylene oxide catalyst. In the present invention, the double cone impregnation method and the vibro-activation method are used; and by means of the cooperation of the two methods, the performance of existing ethylene oxide catalysts is significantly improved, and the shortcomings of existing ethylene oxide catalysts prepared by means of an excess solution impregnation method and activation with a muffle / tube furnace are overcome.

Description

An ethylene oxide catalyst and a preparation method thereof TECHNICAL FIELD

[0001] The present application relates to the technical field of catalyst preparation, in particular to an ethylene oxide catalyst and a preparation method thereof. BACKGROUND

[0002] Ethylene oxide (EO) as a kind of simplest cyclic ether is a very important product in ethylene industry. Ethylene oxide with unique cyclic structure can be used in the production process of various fine chemical products, such as the production of ethylene glycol, the synthesis of detergents, non-ionic surfactants, anti-freezing agents, emulsifiers and ethylene glycol products, and also used in the production of plasticizers, lubricants, rubber and plastics, etc. It is widely used in washing and dyeing, electronics, medicine, pesticides, textiles, papermaking, automobiles, oil exploitation and refining, and many other fields.

[0003] As the main catalyst for the production of ethylene oxide by ethylene oxidation, the ethylene oxide catalyst has attracted extensive attention from researchers. In the process of producing ethylene oxide by ethylene oxidation, the use of catalysts with high activity, high selectivity and high stability is the key to improving economic benefits. However, the current researchers focus on the catalyst carrier and the composition of the catalyst, ignoring the influence of the catalyst impregnation process and the activation process. The performance of the ethylene oxide catalyst is not only related to the performance of the carrier and the composition of the catalyst, but also related to the control of the preparation process and the activation process of the catalyst.

[0004] The main processes of the preparation of the ethylene oxide catalyst are the impregnation of silver solution and the activation process of the catalyst. The impregnation process generally adopts the way of volume excess impregnation. Since the diffusion of the solution in the impregnation process will affect the performance of the final catalyst, the equipment used in the impregnation process is very critical. However, the use of ordinary impregnation method currently seriously affects the performance of the catalyst. At the same time, the activation of the catalyst determines the final performance of the catalyst. The volatilization speed of the solution in the activation process determines the performance of the catalyst. The existing muffle furnace activation and pipe furnace activation limit the final performance of the catalyst. SUMMARY

[0005] In order to solve the above problems, the present application provides an ethylene oxide catalyst and a preparation method thereof.

[0006] In a first aspect, the present application provides a preparation method of an ethylene oxide catalyst, which comprises the following steps:

[0007] obtaining an alumina carrier;

[0008] obtaining an impregnation solution containing silver active component, alkali metal adjuvant and rare earth metal adjuvant;

[0009] loading the impregnation solution onto the alumina carrier by a double-cone impregnation method to obtain a catalyst intermediate;

[0010] activating the catalyst intermediate by a vibration activation method to obtain the ethylene oxide catalyst.

[0011] Further, the physical and chemical property parameters of the alumina carrier include: an α-Al2O3 carrier with a specific surface area of 1-2 m2 / g, a porosity of 45%-75%, an Al2O3 content of more than 98%, and a strength of 60-200 N / pellet, and a shape of Rasching ring, five-hole column, or seven-hole column. Preferably, the α-Al2O3 carrier has a specific surface area of 0.8-1.5 m2 / g, a porosity of 50-55%, a strength of 80-120 N / pellet, and a shape of five-hole column.

[0012] Further, the weight content of each component in the ethylene oxide catalyst is, based on the total weight of the ethylene oxide catalyst: the weight content of the silver active component is 12-25 wt%, the content of the alkali metal promoter is 100-1000 ppm%, and the weight content of the rare earth metal promoter is 100-1200 ppm.

[0013] Further, the step of loading the impregnation solution onto the alumina carrier by a double-cone impregnation method to obtain a catalyst intermediate includes the following process:

[0014] The alumina carrier is added to a double-cone device, vacuum is drawn, the vacuum degree is controlled at -0.05 to -0.25 MPa, circulating cooling water is circulated through the double cone, the temperature is maintained at -10 to 30 oC, and the pretreatment is performed for 1-3 h; then the vacuum is closed, the impregnation solution is added, the double-cone rotation speed is 1-5 revolutions / min, nitrogen is used to pressurize the double cone to 1-3 MPa, and the pressure is maintained for 1-5 h to obtain the catalyst intermediate.

[0015] Further, the step of activating the catalyst intermediate by a vibration activation method to obtain the ethylene oxide catalyst includes the following process:

[0016] The catalyst intermediate is added to a vibration activation furnace, the vacuum frequency is controlled at 20-20 Hz, the catalyst intermediate contact temperature is 120-280 oC, the hot air flow is 10-50 L / h, and the activation time is 1-50 min to obtain the ethylene oxide catalyst.

[0017] Further, the silver active component includes silver nitrate.

[0018] Further, the alkali metal promoter includes at least one of Li, Na, K, Rb, and Cs.

[0019] Further, the rare earth metal promoter comprises at least one of La, Ce, Eu, Y.

[0020] In a second aspect, the present application provides an ethylene oxide catalyst prepared by the method of any one of the first aspect.

[0021] The above technical solution provided by the embodiments of the present application has at least the following advantages compared with the prior art:

[0022] The embodiments of the present application provide an ethylene oxide catalyst and a preparation method thereof. The present application adopts a double-cone impregnation method and a vibration activation mode, which are mutually matched, thereby significantly improving the performance of the existing ethylene oxide catalyst and overcoming the deficiencies of the existing ethylene oxide catalyst using a capacity excessive impregnation mode and a muffle furnace / tube furnace activation. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate an embodiment consistent with the present application and, together with the description, serve to explain the principles of the application.

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0025] FIG. 1 is a flowchart of the preparation method of the ethylene oxide catalyst provided by the embodiments of the present application.

[0026] FIG. 2 is a schematic diagram of the double-cone impregnation process in the preparation method of the ethylene oxide catalyst provided by the embodiments of the present application.

[0027] FIG. 3 is a schematic diagram of the vibration activation process in the preparation method of the ethylene oxide catalyst provided by the embodiments of the present application. Embodiments of the present application

[0028] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative effort fall within the scope of protection of the present application.

[0029] Unless otherwise specifically indicated, all the various raw materials, reagents, instruments and equipment used in the present application can be purchased from the market or can be prepared by the existing methods.

[0030] In a first aspect, the present application provides a preparation method of an ethylene oxide catalyst, as shown in Figure 1, the preparation method of the ethylene oxide catalyst comprising the following steps:

[0031] obtaining an alumina carrier;

[0032] obtaining an impregnation solution containing a silver active component, an alkali metal promoter and a rare earth metal promoter;

[0033] loading the impregnation solution onto the alumina carrier by a double-cone impregnation method to obtain a catalyst intermediate;

[0034] activating the catalyst intermediate by a vibration activation method to obtain the ethylene oxide catalyst.

[0035] The embodiments of the present application provide an ethylene oxide catalyst and a preparation method thereof. The present application adopts a double-cone impregnation method and a vibration activation method, which are matched with each other, significantly improve the performance of the existing ethylene oxide catalyst, and overcome the deficiencies of the existing ethylene oxide catalyst using a capacity excessive impregnation method and a muffle furnace / tube furnace activation.

[0036] In some embodiments, the physicochemical property parameters of the alumina carrier include: an α-Al2O3 carrier with a specific surface area of 1-2 m2 / g, a porosity of 45%-75%, an Al2O3 content of more than 98%, a strength of 60-200 N / pellet, and a shape of a Raschig ring, a five-hole column or a seven-hole column.

[0037] In some embodiments, the weight content of each component in the ethylene oxide catalyst is: the weight content of the silver active component is 12-25 wt%, preferably 15-18 wt%; the content of the alkali metal promoter is 100-1000 ppm, preferably 300-600 ppm; and the weight content of the rare earth metal promoter is 100-1200 ppm, preferably 400-800 ppm, based on the total weight of the ethylene oxide catalyst.

[0038] In some embodiments, as shown in Figure 2, the step of loading the impregnation solution onto the alumina carrier by a double-cone impregnation method to obtain a catalyst intermediate comprises the following process:

[0039] The alumina carrier is added to a double-cone device, vacuumized, and the vacuum degree is controlled at -0.05 to -0.25 MPa; circulating cooling water is circulated in the double-cone, and the temperature is maintained at -10 to 30 o C; and the pretreatment is performed for 1-3 h; then the vacuum is closed, the impregnation solution is added, the double-cone is rotated at 1-5 revolutions per minute, nitrogen is used to pressurize the double-cone to 1-3 MPa, and the pressure is maintained for 1-5 h to obtain the catalyst intermediate.

[0040] In some embodiments, as shown in Figure 3, the step of activating the catalyst intermediate to obtain the ethylene oxide catalyst by using a vibration activation method includes the following process:

[0041] The catalyst intermediate is added into a vibration activation furnace, the vacuum frequency is controlled to be 20-20 Hz, the catalyst intermediate contact temperature is controlled to be 120-280 oC, the hot air flow is controlled to be 10-50 L / h, and the activation time is controlled to be 1-50 min, so as to obtain the ethylene oxide catalyst.

[0042] In some embodiments, the silver active component includes silver nitrate.

[0043] In some embodiments, the alkali metal additive includes at least one of Li, Na, K, Rb, and Cs.

[0044] In some embodiments, the rare earth metal additive includes at least one of La, Ce, Eu, and Y.

[0045] It should be noted that the component raw materials involved in the ethylene oxide catalyst provided by the embodiments of the present application can be directly used as commercially available products if no special limitation or instruction is given.

[0046] In a second aspect, based on the overall inventive concept, the present application provides an ethylene oxide catalyst, which is prepared by using the preparation method of any one of the first aspect.

[0047] The ethylene oxide catalyst provided by the present application has a color of gray black, and the average crushing strength of the catalyst should be greater than 80 N / piece.

[0048] The present application provides an evaluation method of the above-mentioned ethylene oxide catalyst, which includes:

[0049] The present application uses a laboratory customized micro evaluation device for evaluation, the inner diameter of the reaction tube is 1.8 cm, the prepared catalyst is ground to 60-100 mesh particles, the catalyst loading mass is 2 g, and inert porcelain balls are pressed (padded) above (below) to ensure that the catalyst is not taken away during the reaction, and the catalyst loading position is placed in the constant temperature zone of the reactor.

[0050] The evaluation conditions are as follows: the reaction pressure is 2.0 MPa, the reaction temperature is 220 oC, the space velocity is 4200 h-1, the raw material gas composition is: 28% of ethylene, 7% of oxygen, 2% of carbon dioxide, and the balance of nitrogen as a stabilizing gas.

[0051] The application will be further described in conjunction with specific examples. It should be understood that these examples are only used to illustrate the application and not used to limit the scope of the application. The experimental methods in the following examples, if no specific conditions are noted, are generally determined according to the national standards. If there is no corresponding national standard, the international standard, the conventional conditions, or the conditions suggested by the manufacturer are used.

[0052] Example 1

[0053] This example provides an ethylene oxide catalyst, and the preparation method thereof comprises the following steps:

[0054] Preparation of the carrier: 1000g of gibbsite and 200g of pseudoboehmite are kneaded in a kneader, 200mL of 20% nitric acid aqueous solution, and 2g of SiO2, 10g of NH4F are added, and kneaded for 20min. The mesoporous cylinder is extruded in an extruder, dried at 100oC for 3h, and calcined at 1350oC for 4h to obtain carrier A.

[0055] Preparation of the impregnation solution: 800g of silver oxalate is accurately weighed and dissolved in a solution of 30L of water and ethylenediamine, and 8g of ammonium rhenate and 15g of cesium sulfate are continuously added to the solution; after stirring, it is left to stand for 1h and is ready for use.

[0056] Impregnation process: a double-cone impregnator (2.5L) is selected, 500g of the self-prepared α-Al2O3 carrier is added to the reactor, and then the carrier is pretreated at -0.1MPa and 15℃ circulating cooling water in the double-cone, and the pretreatment time is 2h. Then the vacuum is closed, the impregnation solution is added, and the system temperature inside the double-cone is ensured to be 15oC. The double-cone rotates at 2r / min, and the reactor is pressurized to 2MPa with nitrogen, and the pressure is maintained for 2h.

[0057] Activation process: the above catalyst is added to a vibration activation furnace, the temperature is ensured to be 180oC, the hot air flow is 30L / h, and the activation time is 5min, which is recorded as catalyst C1.

[0058] Example 2

[0059] This example provides an ethylene oxide catalyst, and the preparation method thereof comprises the following steps:

[0060] Preparation of the carrier and configuration of the impregnation solution refer to Example 1

[0061] Impregnation process: Impregnation double cone (2.5 L) was selected, 500 g of self-made a-Al2O3 carrier was added into the reactor, then the carrier was pretreated at -0.1 MPa and the double cone circulated cooling water at 15°C, the pretreatment time was 2 h. Then the vacuum was closed, the impregnation solution was added, the system temperature inside the double cone was ensured to be 15°C. The double cone rotation was 2 rotations / min, the reactor was pressurized to 2 MPa with nitrogen, and the pressure was maintained for 2 h.

[0062] Activation process: the above catalyst was added into the vibration activation furnace, the temperature was ensured to be 200°C, the hot air flow was 30 L / h, the activation time was 5 min, and it was recorded as catalyst C2.

[0063] Example 3

[0064] The example provides an ethylene oxide catalyst, and the preparation method thereof comprises the following steps:

[0065] The carrier preparation and the impregnation solution configuration refer to Example 1

[0066] Impregnation process: Impregnation double cone (2.5 L) was selected, 500 g of self-made a-Al2O3 carrier was added into the reactor, then the carrier was pretreated at -0.1 MPa and the double cone circulated cooling water at 15°C, the pretreatment time was 2 h. Then the vacuum was closed, the impregnation solution was added, the system temperature inside the double cone was ensured to be 15°C. The double cone rotation was 2 rotations / min, the reactor was pressurized to 2 MPa with nitrogen, and the pressure was maintained for 2 h.

[0067] Activation process: the above catalyst was added into the vibration activation furnace, the temperature was ensured to be 220°C, the hot air flow was 30 L / h, the activation time was 5 min, and it was recorded as catalyst C3.

[0068] Example 4

[0069] The example provides an ethylene oxide catalyst, and the preparation method thereof comprises the following steps:

[0070] The carrier preparation and the impregnation solution configuration refer to Example 1

[0071] Impregnation process: Impregnation double cone (2.5 L) was selected, 500 g of self-made a-Al2O3 carrier was added into the reactor, then the carrier was pretreated at -0.1 MPa and the double cone circulated cooling water at 15°C, the pretreatment time was 2 h. Then the vacuum was closed, the impregnation solution was added, the system temperature inside the double cone was ensured to be 15°C. The double cone rotation was 2 rotations / min, the reactor was pressurized to 2 MPa with nitrogen, and the pressure was maintained for 2 h.

[0072] Activation process: The above catalyst was added to a vibration activation furnace, ensuring a temperature of 240°C, a hot air flow of 30 L / h, and an activation time of 5 min, and was denoted as catalyst C4.

[0073] Comparative Example 1

[0074] This example provides an ethylene oxide catalyst, the preparation method of which comprises the following steps:

[0075] The carrier preparation and the impregnation liquid configuration refer to Example 1

[0076] Impregnation process: A self-made α-Al2O3 carrier 500 g was added to a reaction tank, the impregnation liquid was added, and impregnation was performed for 2 h.

[0077] Activation process: The above catalyst was added to a vibration activation furnace, ensuring a temperature of 220°C, a hot air flow of 30 L / h, and an activation time of 5 min, and was denoted as catalyst D1.

[0078] Comparative Example 2

[0079] This example provides an ethylene oxide catalyst, the preparation method of which comprises the following steps:

[0080] The carrier preparation and the impregnation liquid configuration refer to Example 1

[0081] Impregnation process: A rotary evaporator was used as a catalyst preparation reactor, a self-made α-Al2O3 carrier 500 g was added to the reactor, then the carrier was ensured to be at -0.1 MPa, the impregnation liquid was added, and impregnation was performed for 2 h.

[0082] Activation process: The above catalyst was added to a vibration activation furnace, ensuring a temperature of 220°C, a hot air flow of 30 L / h, and an activation time of 5 min, and was denoted as catalyst D2.

[0083] Comparative Example 3

[0084] This example provides an ethylene oxide catalyst, the preparation method of which comprises the following steps:

[0085] The carrier preparation and the impregnation liquid configuration refer to Example 1

[0086] Impregnation process: A double-cone impregnation device (2.5 L) was used, a self-made α-Al2O3 carrier 500 g was added to the reactor, then the carrier was pretreated at -0.1 MPa under the circulation of cooling water at 15°C for 2 h. Subsequently, the vacuum was closed, the impregnation liquid was added, the system temperature inside the double-cone was ensured to be 15°C, the double-cone rotated at 2 revolutions / min, and the reactor was pressurized to 2 MPa with nitrogen, and the pressure was maintained for 2 h.

[0087] Activation process: the above catalyst was added to a tube furnace, ensuring a temperature of 220°C and an activation time of 5 min, noted as catalyst D4.

[0088] Comparative Example 4

[0089] This example provides an ethylene oxide catalyst, the preparation method thereof comprising the following steps:

[0090] The carrier preparation and impregnation solution configuration refer to Example 1

[0091] Impregnation process: a double-cone (2.5 L) was selected, 500 g of the self-prepared a-Al2O3 carrier was added to the reactor, and then the carrier was pretreated at -0.1 MPa and 15°C circulating cooling water in the double-cone for 2 h. Subsequently, the vacuum was closed, the impregnation solution was added, and the system temperature inside the double-cone was ensured to be 15°C. The double-cone rotated at 2 revolutions / min, and the reactor was pressurized to 2 MPa with nitrogen, and the pressure was maintained for 2 h.

[0092] Activation process: the above catalyst was added to a tube furnace, ensuring a temperature of 220°C and an activation time of 5 min, noted as catalyst D4.

[0093] Test Example

[0094] This example uses a laboratory custom micro evaluation device for evaluation, the reaction tube has an inner diameter of 1.8 cm, the prepared catalyst is ground to 60-100 mesh particles, the catalyst loading mass is 2 g, and inert porcelain balls are placed on (under) the catalyst to ensure that the catalyst is not taken away during the reaction, and the catalyst loading position is placed in the constant temperature zone of the reactor.

[0095] The evaluation conditions are as follows: the reaction pressure is 2.0 MPa, the reaction temperature is 220°C, the space velocity is 4200 h-1, and the raw material gas composition is: 28% ethylene, 7% oxygen, 2% carbon dioxide, and the balance is nitrogen as a stabilizing gas.

[0096] The catalyst physical properties are shown in Table 1, and the catalyst performance test results are shown in Table 2.

[0097] Table 1 Catalyst physical properties table

[0098]

[0099] Table 2 Catalyst evaluation table

[0100] Item Reaction temperature oC Selectivity (%) C1 208 0.1 C2 208 1.2 C3 208 4.5 C4 208 2.6 D1 207 5.5 D2 207 6.3 D3 207 4.2 D4 207 5.1

[0101] From Table 1 and Table 2 above, it can be seen that: 1) Example 3 using a double cone impregnation and a vibratory activated furnace for activation of the catalyst performed very well; 2) Example 3 versus Comparative Example 1 shows that the catalyst prepared using a negative pressure and pressurized impregnation method performed better than the catalyst prepared without the negative pressure and pressurization steps. Example 3 versus Comparative Example 2 shows that the catalyst prepared using only a negative pressure impregnation performed worse than the catalyst prepared using a negative pressure and pressurization combined impregnation method; 3) Example 3 versus Comparative Example 3 and Comparative Example 4 shows that the catalyst activated using a vibratory activated furnace performed better than the catalyst activated using a tube furnace or a muffle furnace.

[0102] Various embodiments of the present application can exist in a range of forms; it should be understood that the description in a range form is merely for the convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single values within the range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, 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 values within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. In addition, whenever a numerical range is indicated in this document, it refers to any cited number (fraction or integer) within the indicated range.

[0103] In the present application, the orientation words such as "upper" and "lower" are specifically the directions of the drawing surface in the drawings, unless otherwise stated. In addition, in the description of the present application, the terms "comprise", "include", etc. mean "comprise but not limited to". In this document, the relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this document, "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the cases of A alone, A and B together, and B alone. Wherein A and B can be singular or plural. In this document, "one or more" means one or more, and "multiple" means two or more. "At least one", "at least one of the following", or the like, means any combination of these items, including any combination of single or multiple items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can mean a, b, c, a-b (i.e. a and b), a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.

[0104] The foregoing is considered as illustrative only of the principles of the application. Numerous modifications and changes will readily occur to those skilled in the art, and it is intended to embrace all such modifications and changes that fall within the scope of the application. Accordingly, the application is not to be restricted in scope to the specific embodiments disclosed herein but is to be accorded the full scope that the principles and novel features request appropriately granted.

Claims

1. A method for preparing an ethylene oxide catalyst, characterized in that, The preparation method of the ethylene oxide catalyst includes the following steps: Alumina support was obtained; An impregnation solution containing silver active components, alkali metal additives, and rare earth metal additives was obtained; The impregnation solution was loaded onto the alumina support using a double-cone impregnation method to obtain a catalyst intermediate. The catalyst intermediate was activated by vibration activation to obtain the ethylene oxide catalyst.

2. The method for preparing the ethylene oxide catalyst according to claim 1, characterized in that, The physicochemical properties of the alumina support include: an α-Al2O3 support with a specific surface area of ​​1~2 m2 / g, a porosity of 45%~75%, an Al2O3 weight content greater than 98%, a strength of 60~200 N / particle, and a shape of Raschig ring, five-hole column, or seven-hole column.

3. The method for preparing the ethylene oxide catalyst according to claim 1, characterized in that, Based on the total weight of the ethylene oxide catalyst, the weight content of each component in the ethylene oxide catalyst is as follows: the weight content of the silver active component is 12~25wt%, the content of the alkali metal auxiliaries is 100~1000ppmwt, and the weight content of the rare earth metal auxiliaries is 100~1200ppm.

4. The method for preparing the ethylene oxide catalyst according to claim 1, characterized in that, The step of loading the impregnation solution onto the alumina support using a double-cone impregnation method to obtain the catalyst intermediate includes the following process: The alumina support is added to a double-cone apparatus, and a vacuum is drawn, with the vacuum level controlled at -0.05 to -0.25 MPa. The double cone is circulated with cooling water to maintain the temperature at -10 to 30°C for 1 to 3 hours of pretreatment. Then the vacuum is turned off, impregnation liquid is added, the double cone is rotated at 1 to 5 rpm, and nitrogen is used to pressurize the double cone to 1 to 3 MPa. The pressure is maintained for 1 to 5 hours to obtain the catalyst intermediate.

5. The method for preparing the ethylene oxide catalyst according to claim 1, characterized in that, The step of activating the catalyst intermediate using a vibration activation method to obtain the ethylene oxide catalyst includes the following process: The catalyst intermediate is added to a vibration activation furnace, and the vacuum frequency is controlled at 20~20Hz, the catalyst intermediate contact temperature is controlled at 120~280°C, the hot air flow rate is controlled at 10~50L / h, and the activation time is controlled at 1~50 min to obtain the ethylene oxide catalyst.

6. The method for preparing the ethylene oxide catalyst according to claim 1, characterized in that, The silver active component includes silver nitrate.

7. The method for preparing the ethylene oxide catalyst according to claim 1, characterized in that, The alkali metal auxiliaries include at least one of Li, Na, K, Rb, and Cs.

8. The method for preparing the ethylene oxide catalyst according to claim 1, characterized in that, The rare earth metal additives include at least one of La, Ce, Eu, and Y.

9. An ethylene oxide catalyst, characterized in that, The ethylene oxide catalyst is prepared by the preparation method described in any one of claims 1 to 8.

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