CN110339858B - Bi for synthesizing methyl phenyl carbonate2O3-PbO-SBA-15 catalyst, preparation method and application - Google Patents

Abstract

The invention discloses a _{Bi2O3 -} PbO-SBA-15 catalyst for synthesizing methyl phenyl carbonate, wherein the molar ratio of Pb ²⁺ and Bi ³⁺ in the catalyst is 5-6:1, Bi ₂ O The mass ratio of the sum of the mass of ₃ and PbO to the mass of SBA‑15 is 1:4‑24. The present invention also provides a method for synthesizing the Bi ₂ O ₃ -PbO-SBA-15 catalyst of methyl phenyl carbonate. The Bi ₂ O ₃ -PbO-SBA-15 catalyst synthesized by the invention has the characteristics of convenient and controllable synthesis route, stable structure, etc., has good catalytic activity for the transesterification reaction, and can make MPC have higher yield and selection sex. The catalyst prepared by the invention is environmentally friendly, has the advantages of easy separation, recovery and recycling, and has good stability in repeated use, and is a new type of green catalyst.

Description

Bi2O3-PbO-SBA-15 catalyst for the synthesis of methyl phenyl carbonate, preparation method law and application

technical field

The invention belongs to the technical field of organic synthesis catalysts, and specifically discloses a Bi ₂ O ₃ -PbO-SBA-15 catalyst for synthesizing methyl phenyl carbonate, a preparation method and an application.

Background technique

Methyl phenyl carbonate (MPC), as an important organic carbonate, is widely used in chemical, battery, pharmaceutical, material and other fields. The synthetic routes of MPC mainly include the transesterification of methyl chloroformate and phenol, the transesterification of phenyl chloroformate and methanol, and the transesterification of dimethyl carbonate (DMC) and diphenyl carbonate (DPC). The first two methods use highly toxic chloroformates as raw materials, which have potential safety hazards, are not easy to operate, and pollute the environment. Due to the transesterification of DMC and DPC to synthesize MPC, it is environmentally friendly, the reaction process is simple, and the operation is convenient. It is a green synthetic route and has become a hot research topic in recent years.

At present, the catalysts for the transesterification reaction mainly include Lewis acid homogeneous catalysts, supported catalysts and bimetallic composite oxide catalysts. The Lewis acid homogeneous catalyst is used for the transesterification of DMC and DPC to synthesize MPC. Although high-purity MPC can be obtained, the yield of MPC and the stability of the catalyst are not ideal. The supported catalyst is used for transesterification of DMC and DPC to synthesize MPC. Although the yield is high, the selectivity of MPC is poor, and the stability of the catalyst is also poor, so it is difficult to reuse; the bimetallic composite oxide catalyst is used for the transesterification of DMC and DPC to synthesize MPC. Although it has good stability and can be reused, MPC Selectivity is low. Therefore, it is of great significance to develop novel, efficient and stable catalysts, which is also one of the core contents of current MPC synthesis research.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a Bi ₂ O ₃ -PbO-SBA-15 catalyst, preparation method and application for the reaction of dimethyl carbonate and diphenyl carbonate to synthesize methyl phenyl carbonate by transesterification. The use of methyl phenyl carbonate can make the methyl phenyl carbonate have high selectivity, and can be used repeatedly for many times, and has good stability.

The first object of the present invention is to provide a Bi ₂ O ₃ -PbO-SBA-15 catalyst for synthesizing methyl phenyl carbonate, wherein the molar ratio of Pb ²⁺ to Bi ³⁺ in the catalyst is 5- 6:1, the mass ratio of _Bi2O3 to _PbO and SBA-15 is 1:4-24.

The second object of the present invention is to provide a kind of preparation method of Bi ₂ O ₃ -PbO-SBA-15 catalyst for synthesizing methyl phenyl carbonate, comprising the following steps:

SBA-15 is prepared into SBA-15 suspension, then PbO precursor and Bi ₂ O ₃ precursor are added to SBA-15 suspension, mixed evenly, and precipitating agent is added dropwise until the pH value of the reaction solution reaches 9-10 , and then aging, the aging is completed to obtain the reaction product, and the reaction product is processed and calcined to obtain the Bi ₂ O ₃ -PbO-SBA-15 catalyst;

Among them, the molar ratio of Pb ²⁺ and Bi ³⁺ in the PbO precursor and the Bi ₂ O ₃ precursor is 5-6:1;

The Pb ²⁺ in the PbO precursor is calculated as PbO, and the Bi ³⁺ in the Bi ₂ O ₃ precursor is calculated as Bi ₂ O ₃ , then the mass ratio of the sum of the mass of Bi ₂ O ₃ and PbO to that of SBA-15 is 1:4 -twenty four.

Preferably, the PbO precursor is lead nitrate, lead chloride or lead acetate; the Bi ₂ O ₃ precursor is bismuth nitrate pentahydrate or bismuth acetate, and the precipitant is ammonium carbonate.

Preferably, the concentration of the SBA-15 suspension is 0.1-0.22 g/mL.

Preferably, the PbO precursor and the Bi ₂ O ₃ precursor are added to the SBA-15 suspension and heated to 30-80° C. under agitation to make them evenly mixed.

Preferably, the aging conditions are: aging at room temperature for 12-24 hours.

Preferably, the reaction product obtained after the aging is filtered, washed with deionized water and ethanol until neutral, dried, and then calcined at 400-600° C. for 3-5 hours to obtain Bi ₂ O ₃ -PbO-SBA- 15 Catalyst.

Preferably, the preparation process of the SBA-15 is as follows:

The triblock copolymer P123 was added to the HCl solution with a concentration of 2.0 mol/L, and heated to 40°C under stirring conditions to completely dissolve the triblock copolymer P123 to obtain a transparent solution;

TEOS (ethyl orthosilicate) was added dropwise to the transparent solution, aged for 24h under stirring conditions, and then crystallized at 100°C for 24h to obtain the reaction product. After the reaction product was treated, it was calcined at 500°C for 5h to prepare get SBA-15;

Wherein, the dosage ratio of triblock copolymer P123, HCl solution, and TEOS is 1 g: 30 mL: 2 g.

Preferably, the post-processing step is as follows: the reaction product is washed and filtered with deionized water and ethanol for 3-5 hours, and then dried at 100° C. for 12 hours.

The third object of the present invention is to provide the application of the above-mentioned Bi ₂ O ₃ -PbO-SBA-15 catalyst for synthesizing methyl phenyl carbonate in the synthesis of methyl phenyl carbonate.

Compared with the prior art, the beneficial effects of the present invention are:

In the present invention, the transesterification of DMC and DPC to synthesize MPC is a nucleophilic substituted Lewis acid catalysis process, and the addition of Bi changes the chemical state of Pb, making it better dispersibility and showing more moderate-strength Lewis acid active sites , which is conducive to the activation of DMC, which is the main reason for the high selectivity of MPC. In addition, the strong interaction between Pb and Si in Bi ₂ O ₃ -PbO-SBA-15 makes it have better stability for repeated use.

The synthesis route of the Bi ₂ O ₃ -PbO-SBA-15 catalyst synthesized by the invention is convenient and controllable, and the structure is stable. The transesterification reaction has good catalytic activity, and can make MPC have high yield and selectivity, and the catalyst prepared by the invention is environmentally friendly, has the advantages of easy separation, recovery and recycling, and is a new type of green Catalyst with broad application prospects.

Detailed ways

In order to enable those skilled in the art to better understand that the technical solutions of the present invention can be implemented, the present invention will be further described below with reference to specific embodiments, but the embodiments are not intended to limit the present invention.

The experimental methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials can be purchased in the market unless otherwise specified.

Example 1

A Bi ₂ O ₃ -PbO-SBA-15 catalyst for synthesizing methyl phenyl carbonate, the molar ratio of Pb ²⁺ and Bi ³⁺ in the catalyst is 6:1, and the mass of Bi ₂ O ₃ and PbO is equal to And the mass ratio to SBA-15 is 1:7.

The specific preparation method is as follows:

S1, Preparation of SBA-15

10.0 g of triblock copolymer P123 was added to 300 mL of HCl solution with a concentration of 2.0 mol/L, and heated to 40°C under stirring conditions to completely dissolve triblock copolymer P123 to obtain a transparent solution;

20.0 g of TEOS was slowly added dropwise to the transparent solution, aged for 24 h under stirring conditions, and then transferred to a hydrothermal kettle for crystallization at 100 °C for 24 h to obtain the reaction product; the reaction product was washed with deionized water and ethanol for 3 times respectively. After filtering, the product was dried at 100°C for 12h, and then calcined at 500°C for 5h to obtain SBA-15;

S2, Preparation of _{Bi2O3 -} PbO-SBA-15 catalyst

The SBA-15 prepared in S1 was prepared into an SBA-15 suspension with a concentration of 0.1 g/mL, and then 0.79 g of lead nitrate and 0.19 g of bismuth nitrate pentahydrate were added to 44 mL of the SBA-15 suspension, under stirring conditions. It was heated to 30°C to make it evenly mixed, and then ammonium carbonate was added dropwise until the pH value of the solution was 9.0, and then the reaction solution was aged at room temperature for 24 hours to obtain the reaction product, which was filtered and washed with deionized water and ethanol. to neutrality, dried at 110°C for 24h, and then calcined at 600°C for 3h to obtain Bi ₂ O ₃ -PbO-SBA-15 catalyst.

Example 2

A Bi ₂ O ₃ -PbO-SBA-15 catalyst for synthesizing methyl phenyl carbonate, the molar ratio of Pb ²⁺ and Bi ³⁺ in the catalyst is 6:1, and the mass of Bi ₂ O ₃ and PbO is equal to And the mass ratio to SBA-15 is 1:7.

The specific preparation method is as follows:

S1, Preparation of SBA-15

The preparation method of SBA-15 is exactly the same as in Example 1;

Preparation of S2, Bi ₂ O ₃ -PbO-SBA-15 catalyst

The SBA-15 prepared in S1 was prepared into an SBA-15 suspension with a concentration of 0.2 g/mL, and then 0.79 g of lead nitrate and 0.15 g of bismuth acetate were added to 22 mL of the SBA-15 suspension, and heated under stirring conditions to 50°C to make it evenly mixed, then dropwise add ammonium carbonate until the pH value of the solution is 9.5, then the reaction solution is aged at room temperature for 12h to obtain a reaction product, which is filtered and washed with deionized water and ethanol respectively to neutrality, dried at 110°C for 24h, and then calcined at 400°C for 5h to obtain Bi ₂ O ₃ -PbO-SBA-15 catalyst.

Example 3

A Bi ₂ O ₃ -PbO-SBA-15 catalyst for synthesizing methyl phenyl carbonate, the molar ratio of Pb ²⁺ and Bi ³⁺ in the catalyst is 6:1, and the mass of Bi ₂ O ₃ and PbO is equal to And the mass ratio to SBA-15 is 1:7.

The specific preparation method is as follows:

S1, Preparation of SBA-15

The preparation method of SBA-15 is exactly the same as in Example 1;

Preparation of S2, Bi ₂ O ₃ -PbO-SBA-15 catalyst

The SBA-15 prepared by S1 was prepared into an SBA-15 suspension with a concentration of 0.15g/mL, and then 0.67g of lead chloride and 0.19g of bismuth nitrate pentahydrate were added to 29mL of the SBA-15 suspension. Heat to 80°C under conditions to make it evenly mixed, then add ammonium carbonate dropwise until the pH value of the solution is 10.0, and then place the reaction solution at room temperature for 18 hours to obtain the reaction product, which is filtered and deionized water and ethanol. Washed to neutrality, dried at 110°C for 24h, and then calcined at 500°C for 5h to obtain Bi ₂ O ₃ -PbO-SBA-15 catalyst.

Example 4

A Bi ₂ O ₃ -PbO-SBA-15 catalyst for synthesizing methyl phenyl carbonate, the molar ratio of Pb ²⁺ and Bi ³⁺ in the catalyst is 5:1, and the mass of Bi ₂ O ₃ and PbO is equal to And the mass ratio to SBA-15 is 1:24.

The specific preparation method is as follows:

S1, Preparation of SBA-15

The preparation method of SBA-15 is exactly the same as in Example 1;

S2, Preparation of _{Bi2O3 -} PbO-SBA-15 catalyst

The SBA-15 prepared in S1 was prepared into an SBA-15 suspension with a concentration of 0.22 g/mL, and then 0.26 g of lead acetate and 0.05 g of bismuth acetate were added to 20 mL of the SBA-15 suspension, and heated under stirring conditions to 50°C to make it evenly mixed, then dropwise add ammonium carbonate precipitant until the pH value of the solution is 9.5, then the reaction solution is aged at room temperature for 24h to obtain the reaction product, which is filtered and washed with deionized water and ethanol. washed to neutrality, dried at 110 °C for 24 h, and then calcined at 500 °C for 5 h to obtain Bi ₂ O ₃ -PbO-SBA-15 catalyst.

Example 5

A Bi ₂ O ₃ -PbO-SBA-15 catalyst for synthesizing methyl phenyl carbonate, the molar ratio of Pb ²⁺ and Bi ³⁺ in the catalyst is 5:1, and the mass of Bi ₂ O ₃ and PbO is equal to And the mass ratio to SBA-15 is 1:12.

The specific preparation method is as follows:

S1, Preparation of SBA-15

The preparation method of SBA-15 is exactly the same as in Example 1;

Preparation of S2, Bi ₂ O ₃ -PbO-SBA-15 catalyst

The SBA-15 prepared in S1 was prepared into an SBA-15 suspension with a concentration of 0.22g/mL, and then 0.52g of lead acetate and 0.11g of bismuth acetate were added to 20mL of the SBA-15 suspension, and heated under stirring conditions to 80°C to make it evenly mixed, then add ammonium carbonate precipitant dropwise until the pH value of the solution is 10.0, then the reaction solution is aged at room temperature for 12 hours to obtain the reaction product, which is filtered and filtered with deionized water and ethanol. washed to neutrality, dried at 110 °C for 24 h, and then calcined at 500 °C for 5 h to obtain Bi ₂ O ₃ -PbO-SBA-15 catalyst.

Example 6

A Bi ₂ O ₃ -PbO-SBA-15 catalyst for synthesizing methyl phenyl carbonate, the molar ratio of Pb ²⁺ and Bi ³⁺ in the catalyst is 5:1, and the mass of Bi ₂ O ₃ and PbO is equal to And the mass ratio to SBA-15 is 1:7.

The specific preparation method is as follows:

S1, Preparation of SBA-15

The preparation method of SBA-15 is exactly the same as in Example 1;

Preparation of S2, Bi ₂ O ₃ -PbO-SBA-15 catalyst

The SBA-15 prepared by S1 was prepared into an SBA-15 suspension with a concentration of 0.15g/mL, and then 0.88g of lead acetate and 0.18g of bismuth acetate were added to 29mL of the SBA-15 suspension, and heated under stirring conditions to 50°C to make it evenly mixed, then dropwise add ammonium carbonate precipitant until the pH value of the solution is 9.5, then the reaction solution is aged at room temperature for 24h to obtain the reaction product, which is filtered and washed with deionized water and ethanol. washed to neutrality, dried at 110°C for 24h, and then calcined at 500°C for 4h to obtain Bi ₂ O ₃ -PbO-SBA-15 catalyst.

Example 7

A Bi ₂ O ₃ -PbO-SBA-15 catalyst for synthesizing methyl phenyl carbonate, the molar ratio of Pb ²⁺ and Bi ³⁺ in the catalyst is 5:1, and the mass of Bi ₂ O ₃ and PbO is equal to And the mass ratio to SBA-15 is 1:5.

The specific preparation method is as follows:

S1, Preparation of SBA-15

The preparation method of SBA-15 is exactly the same as in Example 1;

Preparation of S2, Bi ₂ O ₃ -PbO-SBA-15 catalyst

The SBA-15 prepared in S1 was prepared into an SBA-15 suspension with a concentration of 0.18g/mL, and then 1.24g of lead acetate and 0.25g of bismuth acetate were added to 25mL of the SBA-15 suspension, and heated under stirring conditions to 80°C to make it evenly mixed, and then dropwise add ammonium carbonate precipitant until the pH value of the solution is 9.0, then the reaction solution is aged at room temperature for 18 hours to obtain the reaction product, which is filtered and filtered with deionized water and ethanol. washed to neutrality, dried at 110 °C for 24 h, and then calcined at 600 °C for 3 h to obtain Bi ₂ O ₃ -PbO-SBA-15 catalyst.

Example 8

A Bi ₂ O ₃ -PbO-SBA-15 catalyst for synthesizing methyl phenyl carbonate, the molar ratio of Pb ²⁺ and Bi ³⁺ in the catalyst is 5:1, and the mass of Bi ₂ O ₃ and PbO is equal to And the mass ratio to SBA-15 is 1:4.

The specific preparation method is as follows:

S1, Preparation of SBA-15

The preparation method of SBA-15 is exactly the same as in Example 1;

Preparation of S2, Bi ₂ O ₃ -PbO-SBA-15 catalyst

The SBA-15 prepared in S1 was prepared into an SBA-15 suspension with a concentration of 0.18 g/mL, and then 1.55 g of lead acetate and 0.32 g of bismuth acetate were added to 25 mL of the SBA-15 suspension, and heated under stirring conditions to 30°C to make it evenly mixed, then dropwise add ammonium carbonate precipitant until the pH value of the solution is 10.0, then the reaction solution is aged at room temperature for 12 hours to obtain the reaction product, which is filtered and filtered with deionized water and ethanol. washed to neutrality, dried at 110°C for 24h, and then calcined at 400°C for 5h to obtain Bi ₂ O ₃ -PbO-SBA-15 catalyst.

In order to verify the performance of the catalyst prepared by the present invention, the catalyst prepared in Examples 1-3 is used in the reaction of catalyzing the transesterification of dimethyl carbonate and diphenyl carbonate to synthesize methyl phenyl carbonate, and the specific process is as follows.

Application Example 1

Utilize the Bi ₂ O ₃ -PbO-SBA-15 catalyst prepared by Example 1 to synthesize the method for methyl phenyl carbonate, the concrete steps are as follows:

(1) in the there-necked flask that is connected with nitrogen conduit, dropping funnel and condenser, replace the air in the device with nitrogen, add the catalyst 1.2g prepared by diphenyl carbonate 17.2g and embodiment 1;

(2) The temperature was raised to 180° C., and 7.5 g of dimethyl carbonate was added dropwise.

Application Example 2

The synthesis method of methyl phenyl carbonate is the same as that in Application Example 1, except that the catalyst used in the reaction is the Bi ₂ O ₃ -PbO-SBA-15 catalyst prepared in Example 2.

Application Example 3

The synthesis method of methyl phenyl carbonate is the same as that in Application Example 1, except that the catalyst used in the reaction is the Bi ₂ O ₃ -PbO-SBA-15 catalyst prepared in Example 3.

Application Example 4

The synthesis method of methyl phenyl carbonate is the same as that of Application Example 1, except that the catalyst used in the reaction is the Bi ₂ O ₃ -PbO-SBA-15 catalyst prepared in Example 4.

Application Example 5

The synthesis method of methyl phenyl carbonate is the same as that in Application Example 1, except that the catalyst used in the reaction is the Bi ₂ O ₃ -PbO-SBA-15 catalyst prepared in Example 5.

Application Example 6

The synthesis method of methyl phenyl carbonate is the same as that in Application Example 1, except that the catalyst used in the reaction is the Bi ₂ O ₃ -PbO-SBA-15 catalyst prepared in Example 6.

Application Example 7

The synthesis method of methyl phenyl carbonate is the same as that in Application Example 1, except that the catalyst used in the reaction is the Bi ₂ O ₃ -PbO-SBA-15 catalyst prepared in Example 7.

Application Example 8

The synthesis method of methyl phenyl carbonate is the same as that in Application Example 1, except that the catalyst used in the reaction is the Bi ₂ O ₃ -PbO-SBA-15 catalyst prepared in Example 8.

An appropriate amount of the reaction solution was taken and analyzed by Shanghai Tianmei 7980 gas chromatograph, and quantified by the corrected normalization method. The catalytic properties of the catalysts prepared in Examples 1-8 are shown in Table 1.

Catalytic performance of the catalysts of Table 1 Examples 1-8

project MPC yield (%) MPC selectivity (%) Example 1 61.5 98.6 Example 2 62.5 98.1 Example 3 65.8 98.9 Example 4 35.4 98.4 Example 5 44.1 98.3 Example 6 62.5 98.6 Example 7 57.1 98.2 Example 8 51.2 98.1

As can be seen from Table 1, when the catalysts in Examples 1-8 are used in the reaction of catalyzing the transesterification of dimethyl carbonate and diphenyl carbonate to synthesize methyl phenyl carbonate, the yield and selectivity of MPC are relatively high. high, indicating that the catalyst prepared by the present invention has good catalytic performance.

Application Example 9

The catalyst after reaction in Application Example 3 was filtered, separated and recovered, washed with DMC, dried at 100°C in a vacuum drying oven, and then used the same steps as in Application Example 3 for the next transesterification to synthesize methyl phenyl carbonate. , and the results are shown in Table 2.

Table 2 Reuse performance of Bi ₂ O ₃ -PbO-SBA-15 catalyst

usage count MPC yield (%) MPC selectivity (%) 1 65.8 98.9 2 64.3 98.4 3 63.1 98.6 4 62.8 98.5

It can be seen from Table 2 that after the catalyst is used four times, the MPC yield remains above 62%, and the MPC selectivity remains at 98%, indicating that the catalyst has good reuse stability.

The present invention describes preferred embodiments, but additional changes and modifications to these embodiments may occur to those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include the preferred embodiment and all changes and modifications that fall within the scope of the present invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (10)

1. Bi for synthesizing methyl phenyl carbonate₂O₃-PbO-SBA-15 catalyst, characterized in that the catalyst contains Pb²⁺And Bi³⁺In a molar ratio of 5 to 6: 1, Bi₂O₃The mass ratio of the sum of PbO and SBA-15 is 1: 4-24;

the Bi₂O₃The preparation method of the-PbO-SBA-15 catalyst comprises the following specific steps:

SBA-15 is prepared into SBA-15 suspension, and then PbO precursor and Bi are added₂O₃Adding the precursor into SBA-15 suspension, uniformly mixing, adding a precipitator dropwise until the pH value of the reaction solution reaches 9-10, then aging, obtaining a reaction product after the aging is finished, and roasting the reaction product after the reaction product is treated to obtain Bi₂O₃-PbO-SBA-15 catalyst.

2. The Bi for synthesizing methyl phenyl carbonate according to claim 1₂O₃The preparation method of the-PbO-SBA-15 catalyst is characterized by comprising the following specific steps of:

SBA-15 is prepared into SBA-15 suspension, and then PbO precursor and Bi are added₂O₃Adding the precursor into SBA-15 suspension, uniformly mixing, adding a precipitator dropwise until the pH value of the reaction solution reaches 9-10, then aging, obtaining a reaction product after the aging is finished, and roasting the reaction product after the reaction product is treated to obtain Bi₂O₃-PbO-SBA-15 catalyst;

wherein, PbO precursor and Bi₂O₃Pb in the precursor²⁺And Bi³⁺In a molar ratio of 5 to 6: 1;

pb in PbO precursor²⁺Calculated as PbO, Bi₂O₃Bi in the precursor³⁺With Bi₂O₃Measured then Bi₂O₃The mass ratio of the sum of PbO and SBA-15 is 1: 4-24.

3. The Bi for synthesizing methyl phenyl carbonate according to claim 2₂O₃The preparation method of the-PbO-SBA-15 catalyst is characterized in that the PbO precursor is lead nitrate, lead chloride or lead acetate; the Bi₂O₃The precursor is pentahydrate bismuth nitrate or bismuth acetate, and the precipitator is ammonium carbonate.

4. The Bi for synthesizing methyl phenyl carbonate according to claim 2₂O₃-PbO-SBA-15 catalyst, characterized in that the concentration of the SBA-15 suspension is 0.1-0.22 g/mL.

5. The Bi for synthesizing methyl phenyl carbonate according to claim 2₂O₃The preparation method of the (E) -PbO-SBA-15 catalyst is characterized in that a PbO precursor and Bi₂O₃Adding the precursor into the SBA-15 suspension, heating to 30-80 ℃ under the condition of stirring, and uniformly mixing.

6. The Bi for synthesizing methyl phenyl carbonate according to claim 2₂O₃-PbO-SBA-15 catalyst, characterized in that the aging conditions are: aging at room temperature for 12-24 h.

7. The Bi for synthesizing methyl phenyl carbonate according to claim 6₂O₃The preparation method of the-PbO-SBA-15 catalyst is characterized in that a reaction product obtained after aging is filtered, washed to be neutral by deionized water and ethanol, dried and roasted for 3 to 5 hours at the temperature of 600 ℃ with 400-₂O₃-PbO-SBA-15 catalyst.

8. The Bi for synthesizing methyl phenyl carbonate according to claim 2₂O₃-a method for preparing a PbO-SBA-15 catalyst, characterized in that SBA-15 is prepared as follows:

adding the triblock copolymer P123 into an HCl solution with the concentration of 2.0mol/L, and heating to 40 ℃ under the stirring condition to completely dissolve the triblock copolymer P123 to obtain a transparent solution;

adding TEOS dropwise into the transparent solution, aging for 24h under stirring, crystallizing for 24h at 100 ℃ to obtain a reaction product, and roasting for 5h at 500 ℃ after the reaction product is treated to obtain SBA-15;

wherein the dosage ratio of the triblock copolymer P123 to the HCl solution to the TEOS is 1 g: 30mL of: 2g of the total weight.

9. The Bi for synthesizing methyl phenyl carbonate according to claim 8₂O₃The preparation method of the-PbO-SBA-15 catalyst is characterized in that in the preparation process of the SBA-15, the reaction product treatment steps are as follows: the reaction product is washed and filtered by deionized water and ethanol respectively, and then dried for 12h at 100 ℃.

10. The Bi for synthesizing methyl phenyl carbonate according to claim 1₂O₃-PbO-SBA-15 catalyst in the synthesis of methyl phenyl carbonate.