Molecular sieve catalyst, its preparation method and application and method for treating chlorinated petrochemical organic waste gas

Abstract

The present application relates to the field of catalyst, disclose a kind of molecular sieve catalyst for catalytic combustion treatment chlorinated organic waste gas and its preparation method and application, the catalyst contains carrier ultrastable Y molecular sieve, and active metal component cobalt and indium.Preparation includes: in the salt solution containing cobalt indium, precipitant and ultrastable Y molecular sieve contact, then separate, dry, calcination.The present application provides a kind of catalytic combustion method to treat chlorinated petrochemical organic waste gas.The catalyst of the present application is higher in activity, and can be widely used in catalytic oxidation combustion reaction of chlorinated petrochemical organic waste gas and other industrial organic waste gas.

Description

Technical Field

[0001] This invention relates to the field of catalysts, specifically to a molecular sieve catalyst for treating chlorine-containing organic waste gas by catalytic combustion, its preparation method and application, and a method for treating chlorine-containing petrochemical organic waste gas by catalytic combustion. Background Technology

[0002] Petrochemical production processes frequently generate waste gases containing volatile organic compounds (VOCs). These include the use of chemicals such as paints, lubricants, and organic solvents; the incineration of industrial waste; the emission of various exhaust gases; petrochemical and oil refining processes; rubber production; and the frequent use of pesticides. Direct release of these waste gases into the atmosphere causes significant harm to the atmospheric environment. Most VOCs have unpleasant odors and can cause illness and even cancer in humans; halogenated VOCs, in particular, are highly toxic and can react with ozone to produce photochemical smog, causing severe damage to the Earth's environment. Therefore, the effective treatment of organic waste gases generated during petrochemical production is an important topic in environmental science.

[0003] The most fundamental and effective way to control volatile organic compound (VOC) pollution is to replace current processes with green and pollution-free technologies, reducing or eliminating the use of harmful raw materials and controlling emissions. However, due to limitations in science and technology, many industries affecting people's livelihoods cannot yet find environmentally friendly alternatives, and their production and use inevitably still release various organic waste gases into the environment. To mitigate the harm of VOCs to the environment and humans, current methods generally employ recovery (physical methods) or degradation (chemical methods) to control VOC emissions. Physical methods include adsorption, condensation, and membrane separation, which are non-destructive methods. Their advantage is the ability to recover and reuse VOCs, but the treatment is incomplete and can easily cause secondary pollution. Chemical methods mainly include direct thermal combustion and catalytic combustion. The characteristic of chemical methods is thorough treatment. Thermal combustion, which involves cracking harmful substances in exhaust gases at high temperatures (800-900℃), consumes large amounts of fuel oil, resulting in high operating costs and energy consumption. It also has a low removal rate for halogenated organic compounds. Direct combustion of chlorinated VOCs requires high combustion temperatures, and incomplete combustion produces harmful substances such as CO, formaldehyde, phosgene, and formic acid, causing secondary pollution. In contrast, catalytic combustion, aided by a catalyst, lowers the operating temperature to 280-450℃, significantly reducing energy consumption. It is safer, more stable, and less expensive, and it does not produce nitrogen oxides, thus avoiding secondary pollution. Therefore, catalytic combustion is a more ideal method for treating petrochemical organic waste gas.

[0004] Catalysts for catalytic combustion mainly include: noble metal catalysts, such as Pt, Pd, and Rh, which have high activity but poor halogen resistance, are easily poisoned, and are scarce and expensive; single metal oxide catalysts, such as copper, manganese, and cobalt oxides, which are lower in cost but have generally lower activity; and composite oxide catalysts, which are readily available, have good halogen resistance, are not easily poisoned, and have higher catalytic activity than the corresponding single oxides. For example, CN103769074B discloses a catalytic combustion catalyst prepared by loading a composite oxide of cerium, lanthanum, and zirconium onto honeycomb ceramics or alumina. It also describes the in-situ loading of noble and non-noble metal oxides onto molecular sieve supports to prepare catalysts. This catalyst has the advantages of high activity and resistance to halogen and water vapor poisoning, and has broad application prospects, such as in the treatment of industrial waste gas containing epichlorohydrin and allyl chloride using catalytic combustion. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems of high cost and poor toxicity of precious metal catalysts for catalytic combustion of chlorinated petrochemical organic waste gas in the prior art, and to provide a molecular sieve catalyst for catalytic combustion treatment of chlorinated organic waste gas. This catalyst has the advantages of low raw material cost, high activity and good toxicity resistance, and its application in catalytic combustion can significantly reduce the reaction temperature.

[0006] To achieve the above objectives, the present invention provides a molecular sieve catalyst for catalytic combustion treatment of chlorine-containing organic waste gas, wherein the catalyst contains a supported ultrastable Y molecular sieve and active metal components cobalt and indium.

[0007] The second aspect of the present invention provides a method for preparing the molecular sieve catalyst of the present invention, the method comprising: mixing and contacting a cobalt-indium salt solution, a precipitant and an ultrastable Y molecular sieve, followed by separation, drying and calcination.

[0008] The catalyst prepared by this invention has the characteristics of high activity, halogen resistance, and good water resistance.

[0009] A third aspect of the present invention provides the application of the catalyst described herein in the catalytic combustion of chlorine-containing petrochemical organic waste gas.

[0010] The molecular sieve catalyst prepared by this invention has high activity and can be widely used in the catalytic oxidation and combustion reaction of industrial organic waste gases such as chlorinated petrochemical organic waste gases.

[0011] The fourth aspect of the present invention provides a method for treating chlorinated petrochemical organic waste gas by catalytic combustion, the method comprising: in the presence of the catalyst described in the present invention, introducing oxygen-containing gas at a temperature of 200-500°C to combust the chlorinated petrochemical organic waste gas.

[0012] The molecular sieve catalyst of this invention can catalytically combust chlorine-containing petrochemical organic waste gas to produce carbon dioxide and water at a relatively low temperature.

[0013] The molecular sieve catalyst of the present invention, when the chlorinated petrochemical organic waste gas contains allyl chloride and epichlorohydrin, achieves a conversion rate of over 99% for allyl chloride and epichlorohydrin when the catalyst bed temperature is above 420°C, and a selectivity of over 99% for the final product carbon dioxide. Detailed Implementation

[0014] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0015] This invention provides a molecular sieve catalyst for catalytic combustion treatment of chlorine-containing organic waste gas, wherein the catalyst contains a supported ultrastable Y molecular sieve, and active metal components cobalt and indium.

[0016] According to a preferred embodiment of the present invention, the molecular sieve catalyst has a BET specific surface area of ​​200–800 m². 2 / g, preferably 300-700m 2 / g. By adopting the aforementioned preferred scheme, the catalyst performance can be further improved.

[0017] In this invention, as long as the objective of the invention can be achieved, there are no special requirements for the content of the active metal component of the molecular sieve catalyst. According to a preferred embodiment of the invention, the total mass content of cobalt and indium in the molecular sieve catalyst, calculated as oxides, is 0.1-10%, preferably 1-5%. By adopting the aforementioned preferred embodiment, the catalyst performance can be further improved.

[0018] In this invention, as long as the objective of the invention can be achieved, there are no particular requirements for the molar ratio of the active metal components cobalt and indium. According to a preferred embodiment of the invention, the molar ratio of the active metal components cobalt and indium is (1-25):1, preferably (4-22):1. By adopting the aforementioned preferred scheme, the catalyst performance can be further improved.

[0019] In this invention, molecular sieve catalysts with the aforementioned characteristics can achieve the purpose of this invention. There are no special requirements for the preparation method of the molecular sieve catalyst. According to a preferred embodiment of this invention, the preparation method of the molecular sieve catalyst includes: mixing and contacting a cobalt-indium salt solution, a precipitant and an ultrastable Y molecular sieve, followed by separation, drying and calcination.

[0020] According to a preferred embodiment of the present invention, the contact is preferably carried out under dynamic conditions, such as stirring. The stirring conditions are not particularly required and are determined according to operational needs.

[0021] The catalyst prepared by this invention has the characteristics of high activity, halogen resistance, and good water resistance.

[0022] According to a particularly preferred embodiment of the present invention, the preparation method wherein the contact conditions include: a temperature of 40–95°C and a time of 1–5 hours.

[0023] According to a particularly preferred embodiment of the present invention, the preparation method further includes contact conditions of: being carried out under water bath conditions, wherein the precipitant is added dropwise to a mixed solution of cobalt-indium salt and ultrastable Y molecular sieve.

[0024] In this invention, the precipitant can be any conventional choice in the art, as long as it achieves the objective of the invention. According to a preferred embodiment of the invention, the precipitant is selected from at least one of ammonia and urea. By adopting the aforementioned preferred embodiment, the catalyst performance can be further improved.

[0025] In this invention, as long as the objective of the invention can be achieved, there are no special requirements for the molar ratio of the precipitant to the active component. According to a preferred embodiment of the invention, the molar ratio of the precipitant to the active metal component is (10-30):1. By adopting the aforementioned preferred scheme, the catalyst performance can be further improved.

[0026] In this invention, as long as the objective of the invention is achieved, there are no particular requirements regarding the concentration of the cobalt-indium salt solution. According to a preferred embodiment of the invention, the concentration of the cobalt-indium salt solution is 0.05–5 mol / L. By adopting the aforementioned preferred embodiment, the catalyst performance can be further improved.

[0027] In this invention, as long as the purpose of this invention can be achieved, the cobalt salt and indium salt can be conventional choices in the art. According to a preferred embodiment of this invention, the cobalt salt and indium salt are each selected from one or more of nitrates, acetates and hydrochlorides. In the embodiments of this invention, cobalt nitrate hexahydrate is used as a cobalt salt to illustrate the advantages of this invention, and indium nitrate monohydrate is used as an indium salt to illustrate the advantages of this invention, but this invention is not limited thereto.

[0028] In this invention, as long as the objective of this invention can be achieved, the drying conditions in the preparation method can be conventionally chosen in the art. According to a preferred embodiment of this invention, the drying conditions include: a temperature of 80–120°C, and a drying time determined as needed. For this invention, a drying time of 2–5 hours is preferred. By adopting the aforementioned preferred scheme, the catalyst performance can be further improved.

[0029] In this invention, as long as the objective of this invention can be achieved, the calcination conditions in the preparation method can be conventionally selected in the art. According to a preferred embodiment of this invention, the calcination conditions include: a temperature of 500–650°C, and a calcination time determined as needed. For this invention, a calcination time of 3–8 hours is preferred. By adopting the aforementioned preferred scheme, the catalyst performance can be further improved.

[0030] Another aspect of the present invention provides the application of the catalyst described herein in the catalytic combustion of chlorine-containing petrochemical organic waste gas.

[0031] The present invention also provides a method for treating chlorinated petrochemical organic waste gas by catalytic combustion, the method comprising: in the presence of the catalyst described in the present invention, introducing oxygen-containing gas at a temperature of 200-500°C to combust the chlorinated petrochemical organic waste gas.

[0032] In this invention, there are no special requirements for the oxygen-containing gas; commonly used oxygen-containing combustion gases can be used in this invention. According to a preferred embodiment of this invention, the oxygen-containing gas is a mixture of inert gas and oxygen or air.

[0033] According to a preferred embodiment of the present invention, the chlorinated petrochemical organic waste gas contains one or more of chloropropene and epichlorohydrin volatile organic compounds.

[0034] According to a preferred embodiment of the present invention, the allyl chloride content in the chlorinated petrochemical organic waste gas is 0-3000 mg / m³. 3 The preferred concentration is 1000-2000 mg / m³. 3 and epichlorohydrin content of 0-3000 mg / m³ 3 The preferred concentration is 1000-2000 mg / m³. 3 .

[0035] According to a preferred embodiment of the present invention, the volume content of water in the chlorinated petrochemical organic waste gas ranges from 0 to 10%, preferably from 2 to 6%.

[0036] The molecular sieve catalyst prepared in this invention is suitable for use in chlorinated petrochemical organic waste gas components allyl chloride and epichlorohydrin at a concentration of 3000 mg / m³. 3Under these conditions, when the catalyst bed temperature is above 420℃, the conversion rate of propylene chloride and epichlorohydrin is above 99%, and the selectivity of the final product carbon dioxide is above 99%.

[0037] The present invention will be further described below through specific embodiments. The scope of the present invention is not limited to the scope covered by the embodiments. The evaluation method for the molecular sieve catalyst of the present invention is as follows: at 20000 ml·g -1 ·h -1 At a gas space velocity of [value missing], the chlorinated petrochemical organic waste gas undergoes a catalytic combustion reaction under the catalysis of the aforementioned catalyst. The allyl chloride content in the chlorinated petrochemical organic waste gas is 1500 mg / m³. 3 The epichlorohydrin content is 1500 mg / m³. 3 The water volume content is 5%.

[0038] Example 1

[0039] A solution was prepared by dissolving 6.5 g of cobalt nitrate hexahydrate and 0.57 g of indium nitrate monohydrate in 150 g of water. Then, 30 g of ultrastable Y2 was added to the solution. Under stirring and a 67.5 °C water bath, 112.6 g of 15% wt ammonia solution was added dropwise for 3 hours. The resulting slurry was filtered, and the solid was dried at 100 °C for 4 hours, followed by calcination at 550 °C for 4 hours to obtain the catalyst. This catalyst contained 3% by mass of cobalt and indium non-precious metal oxides and had a specific surface area of ​​500 m². 2 / g. Finally, the catalyst was compressed into tablets for evaluation.

[0040] In 20000ml·g -1 ·h -1 At a gas hourly space velocity (GHSV) in an air atmosphere, under programmed temperature increases starting from 200°C, chlorinated petrochemical organic waste gas undergoes catalytic combustion under the catalysis of the aforementioned catalyst. The reaction results are shown in Table 1. The allyl chloride content in the chlorinated petrochemical organic waste gas is 1500 mg / m³. 3 The epichlorohydrin content is 1500 mg / m³. 3 The water volume content is 5%.

[0041] Example 2

[0042] 3.5 g of cobalt nitrate hexahydrate and 0.77 g of indium nitrate monohydrate were dissolved in 150 g of water to obtain a solution. Then, 30 g of ultrastable Y1 was added to the above solution. 33.6 g of 15 wt% ammonia solution was added dropwise to the above solution under stirring and a water bath at 40 °C. After the addition was complete, the mixture was stirred for 3 hours. The slurry was filtered, and the resulting solid was dried at 100 °C for 4 hours, and then calcined at 550 °C for 4 hours to obtain the catalyst. The catalyst contained 1% by mass of cobalt and indium non-precious metal oxides, and the catalyst had a specific surface area of ​​300 m². 2 / g. Finally, the catalyst was compressed into tablets for evaluation.

[0043] In 20000ml·g -1 ·h -1 At a gas hourly space velocity (GHSV) in an air atmosphere, under programmed temperature increases starting from 200°C, chlorinated petrochemical organic waste gas undergoes catalytic combustion under the catalysis of the aforementioned catalyst. The reaction results are shown in Table 1. The allyl chloride content in the chlorinated petrochemical organic waste gas is 1500 mg / m³. 3 The epichlorohydrin content is 1500 mg / m³. 3 The water volume content is 5%.

[0044] Example 3

[0045] 11 g of cobalt nitrate hexahydrate, 0.60 g of indium nitrate monohydrate, and 71.4 g of urea were dissolved in 150 g of water to obtain a solution. Then, 30 g of ultrastable Y3 was added to the above solution. The solution was heated to 95 °C in a water bath and stirred for 3 hours. The slurry was filtered, and the resulting solid was dried at 100 °C for 4 hours and then calcined at 550 °C for 4 hours to obtain the catalyst. The catalyst contained 5% by mass of cobalt and indium non-noble metal oxides and had a specific surface area of ​​700 m². 2 / g. Finally, the catalyst was compressed into tablets for evaluation.

[0046] In 20000ml·g -1 ·h -1 At a gas hourly space velocity (GHSV) in an air atmosphere, under programmed temperature increases starting from 200°C, chlorinated petrochemical organic waste gas undergoes catalytic combustion under the catalysis of the aforementioned catalyst. The reaction results are shown in Table 1. The allyl chloride content in the chlorinated petrochemical organic waste gas is 1500 mg / m³. 3 The epichlorohydrin content is 1500 mg / m³. 3 The water volume content is 5%.

[0047] Example 4

[0048] The method was the same as in Example 1, except that the specific surface area of ​​the prepared ultrastable Y was different, and the final catalyst had a specific surface area of ​​200 m². 2 / g, the results are shown in Table 1.

[0049] Example 5

[0050] The method of Example 1 was followed, except that the loading of the catalyst active component was 0.5%, and the results are shown in Table 1.

[0051] Example 6

[0052] The method of Example 1 was followed, except that the molar ratio of the active components cobalt and indium was 25:1, and the results are shown in Table 1.

[0053] Example 7

[0054] The method of Example 1 was followed, except that NaOH was added as the precipitant. The results are shown in Table 1.

[0055] Example 8

[0056] The method of Example 1 was followed, except that the molar ratio of the added precipitant to the active component was 8, and the results are shown in Table 1.

[0057] Example 9

[0058] The method was followed in Example 1, except that the water bath temperature during precipitation was 30°C. The results are shown in Table 1.

[0059] Comparative Example 1

[0060] A solution was prepared by dissolving 6.5 g of cobalt nitrate hexahydrate and 0.57 g of indium nitrate monohydrate in 150 g of water. Then, 30 g of alumina was added to the solution. Under stirring and a water bath at 67.5 °C, 112.6 g of 15 wt% ammonia solution was added dropwise, followed by stirring for 3 hours. The slurry was filtered, and the resulting solid was dried at 100 °C for 4 hours and then calcined at 550 °C for 4 hours to obtain the catalyst. This catalyst contained 3% by mass of cobalt and indium non-precious metal oxides and had a specific surface area of ​​500 m². 2 Finally, the catalyst was compressed into tablets for evaluation.

[0061] In 20000ml·g -1 ·h -1 At a gas hourly space velocity (GHSV) in an air atmosphere, under programmed temperature increases starting from 200°C, chlorinated petrochemical organic waste gas undergoes catalytic combustion under the catalysis of the aforementioned catalyst. The reaction results are shown in Table 1. The allyl chloride content in the chlorinated petrochemical organic waste gas is 1500 mg / m³. 3 The epichlorohydrin content is 1500 mg / m³. 3 The water volume content is 5%.

[0062] Comparative Example 2

[0063] 11 g of cobalt nitrate hexahydrate, 0.60 g of indium nitrate monohydrate, and 71.4 g of urea were dissolved in 150 g of water to obtain a solution. Then, 30 g of alumina was added to the above solution. The solution was heated to 95 °C in a water bath and stirred for 3 hours. The slurry was filtered, and the resulting solid was dried at 100 °C for 4 hours and then calcined at 550 °C for 4 hours to obtain a catalyst. The catalyst contained 5% by mass of cobalt and indium non-precious metal oxides and had a specific surface area of ​​500 m². 2 / g. Finally, the catalyst was compressed into tablets for evaluation.

[0064] In 20000ml·g -1 ·h -1 At a gas hourly space velocity (GHSV) in an air atmosphere, under programmed temperature increases starting from 200°C, chlorinated petrochemical organic waste gas undergoes catalytic combustion under the catalysis of the aforementioned catalyst. The reaction results are shown in Table 1. The allyl chloride content in the chlorinated petrochemical organic waste gas is 1500 mg / m³. 3 The epichlorohydrin content is 1500 mg / m³. 3 The water volume content is 5%.

[0065] Comparative Example 3

[0066] The method of Example 1 was followed, except that indium nitrate was not used, and cobalt nitrate hexahydrate was used entirely, while the amount of active component remained unchanged. The results are shown in Table 1.

[0067] 7.02 g of cobalt nitrate hexahydrate was dissolved in 150 g of water to obtain a solution, and then 30 g of ultrastable Y1 was added to the solution. 112.6 g of 15 wt% ammonia solution was added dropwise to the solution under stirring and a water bath at 67.5 °C, and stirring was continued for 3 hours after the addition was complete. The slurry was filtered, and the resulting solid was dried at 100 °C for 4 hours, and then calcined at 550 °C for 4 hours to obtain the catalyst. The catalyst contained 3% by mass of cobalt non-precious metal oxides and had a specific surface area of ​​500 m². 2 Finally, the catalyst was compressed into tablets for evaluation.

[0068] In 20000ml·g -1 ·h -1 At a gas hourly space velocity (GHSV) in an air atmosphere, under programmed temperature increases starting from 200°C, chlorinated petrochemical organic waste gas undergoes catalytic combustion under the catalysis of the aforementioned catalyst. The reaction results are shown in Table 1. The allyl chloride content in the chlorinated petrochemical organic waste gas is 1500 mg / m³. 3 The epichlorohydrin content is 1500 mg / m³. 3 The water volume content is 5%.

[0069] Table 1: Catalyst Composition and Performance of Examples and Comparative Examples

[0070]

[0071]

[0072] In Table 1, T1 represents the minimum inlet temperature when the conversion rate of allyl chloride is above 99%, and T2 represents the minimum inlet temperature when the conversion rate of epichlorohydrin is above 99%.

[0073] The data in the table above may differ from the examples due to writing errors; therefore, the data in the examples shall prevail.

[0074] In this invention, the reaction is evaluated using a programmed temperature rise method. The minimum inlet temperature refers to the lowest temperature at which the conversion rate reaches 99%. The selectivity of carbon dioxide = amount of substrate converted into carbon dioxide * 100 / (amount of substrate converted into carbon dioxide + amount of substrate converted into other substances).

[0075] As can be seen from the results in Table 1, the molecular sieve catalyst of the present invention has significant performance advantages over ordinary alumina supported catalysts.

[0076] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. The application of a molecular sieve catalyst in the catalytic combustion of chlorine-containing petrochemical organic waste gas, characterized in that, The catalyst contains a supported ultrastable Y molecular sieve, and active metal components cobalt and indium. In the molecular sieve catalyst, the total mass content of cobalt and indium, calculated as oxides, is 0.1-10%, and the molar ratio of cobalt to indium is (1-25):

1.

2. The application according to claim 1, wherein, The molecular sieve catalyst has a BET specific surface area of ​​200-800 m². 2 / g.

3. The application according to claim 2, wherein, The molecular sieve catalyst has a BET specific surface area of ​​300–700 m². 2 / g.

4. The application according to any one of claims 1-3, wherein, In the molecular sieve catalyst, the total mass content of cobalt and indium, calculated as oxides, is 1–5%; and / or The molar ratio of cobalt to indium is (4–22):

1.

5. The application according to any one of claims 1-3, wherein, The preparation method of molecular sieve catalyst includes: mixing and contacting a cobalt-indium salt solution, a precipitant and an ultrastable Y molecular sieve, followed by separation, drying and calcination.

6. The application according to claim 5, wherein, The contact conditions include a temperature of 40–95°C and a time of 1–5 hours.

7. The application according to claim 5, wherein, The precipitant is ammonia and / or urea; and / or The molar ratio of the precipitant to the active metal component element is (10–30):1; and / or The concentration of the cobalt-indium salt solution is 0.05 mol / L to 5 mol / L; and / or The cobalt salt and indium salt are each selected from one or more of nitrates, acetates and hydrochlorides.

8. The application according to claim 5, wherein, Drying conditions include: a temperature of 80–120°C and a time of 2–5 hours; and / or The roasting conditions include a temperature of 500–650℃ and a time of 3–8 hours.

9. A method for treating chlorine-containing petrochemical organic waste gas by catalytic combustion, characterized in that, The method includes: in the presence of a molecular sieve catalyst, introducing oxygen-containing gas at 200-500°C to combust chlorinated petrochemical organic waste gas. The catalyst contains a support of ultrastable Y molecular sieve, and active metal components cobalt and indium. In the molecular sieve catalyst, the total mass content of cobalt and indium, calculated as oxides, is 0.1-10%, and the molar ratio of cobalt to indium is (1-25):

1.

10. The method according to claim 9, wherein, The molecular sieve catalyst has a BET specific surface area of ​​200-800 m². 2 / g.

11. The method according to claim 10, wherein, The molecular sieve catalyst has a BET specific surface area of ​​300–700 m². 2 / g.

12. The method according to claim 9, wherein, In the molecular sieve catalyst, the total mass content of cobalt and indium, calculated as oxides, is 1–5%; and / or The molar ratio of cobalt to indium is (4–22):

1.

13. The method according to claim 9, wherein, The oxygen-containing gas is a mixture of inert gas and oxygen or air; and / or The chlorinated petrochemical organic waste gas contains one or more of the following volatile organic compounds: allyl chloride and epichlorohydrin; and / or The volumetric content of water in chlorinated petrochemical organic waste gas ranges from 0% to 10%.

14. The method according to claim 13, wherein, The allyl chloride content in the chlorinated petrochemical organic waste gas is 0-3000 mg / m³. 3 Epichlorohydrin content is 0-3000 mg / m³ 3 The content of allyl chloride and epichlorohydrin are not both 0; and / or The volumetric content of water in chlorinated petrochemical organic waste gas ranges from 2% to 6%.

15. The method according to claim 14, wherein, The allyl chloride content in the chlorinated petrochemical organic waste gas is 1000-2000 mg / m³. 3 The epichlorohydrin content is 1000-2000 mg / m³. 3 ; and / or The volumetric content of water in chlorinated petrochemical organic waste gas ranges from 2% to 6%.

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