Catalysts and methods for oxidizing aromatic volatile organic compounds

Abstract

The present disclosure relates to a catalyst for oxidizing aromatic volatile organic compounds, comprising a mesoporous metal oxide, wherein the chemical formula of the mesoporous metal oxide is Ce x M y O z , wherein M is Mn, Co, or Cu, x+y=100, and z=100 to 200; when M is Mn, x=0.05 to 20, and y=99.95 to 80; when M is Co, x=0.05 to 20, and y=99.95 to 80; and when M is Cu, x=0.05 to 20, and y=99.95 to 80.

Description

Technical Field

[0001] The present invention relates to a method for oxidizing aromatic volatile organic compounds and a catalyst used therein. Background Art

[0002] In recent years, the air pollution problem caused by aromatic volatile organic compounds (VOCs) has attracted increasing attention. At present, the main methods for removing aromatic volatile organic compounds are adsorption, incineration, photocatalysis, and catalytic oxidation, among which catalytic oxidation is the most effective method for removing VOCs. The active components of the catalyst used in the catalytic oxidation method generally contain precious metals such as Pt, Pd, Rh, Ru, Au, or Ag, because of their high adsorption and oxidative decomposition ability for VOCs, thereby greatly improving the catalyst activity, but they have the problems of high cost and easy sintering. Therefore, it is urgent to develop catalysts that do not contain precious metals for use in catalytic oxidation methods for removing aromatic VOCs. Summary of the invention

[0003] The catalyst for oxidizing aromatic volatile organic compounds provided in one embodiment of the present disclosure includes a mesoporous metal oxide, wherein the chemical formula of the mesoporous metal oxide is Ce x M y O z , wherein M is Mn, Co, or Cu, x+y=100, and z=100 to 200; when M is Mn, x=0.05 to 20, and y=99.95 to 80; when M is Co, x=0.05 to 20, and y=99.95 to 80; and when M is Cu, x=0.05 to 20, and y=99.95 to 80.

[0004] The present invention provides a method for oxidizing aromatic volatile organic compounds, comprising: introducing aromatic volatile organic compounds and oxygen into a catalyst to oxidize the aromatic volatile organic compounds into water and carbon dioxide, wherein the catalyst comprises a mesoporous metal oxide, wherein the chemical formula of the mesoporous metal oxide is Ce: x M y O z , wherein M is Mn, Co, or Cu, x+y=100, and z=100 to 200; when M is Mn, x=0.05 to 20, and y=99.95 to 80; when M is Co, x=0.05 to 20, and y=99.95 to 80; and when M is Cu, x=0.05 to 20, and y=99.95 to 80. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1A and 1B For mesoporous catalyst Ce10 Mn 90 O z Transmission electron microscope image.

[0006] Figure 2A and 2B For mesoporous catalyst Ce1Mn 99 O z Transmission electron microscope image.

[0007] Figure 3A and 3B For mesoporous catalyst Ce 30 Mn 70 O z Transmission electron microscope image. DETAILED DESCRIPTION

[0008] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in conjunction with specific embodiments.

[0009] The catalyst for oxidizing aromatic volatile organic compounds provided in one embodiment of the present disclosure includes a mesoporous metal oxide, wherein the chemical formula of the mesoporous metal oxide is Ce x M y O z (A mixed structure with no obvious distinction between cerium oxide and M oxide is formed, except when x≤2, Ce is distributed on M oxide in the form of single atoms), where M is Mn, Co, or Cu, x+y=100, and z=100 to 200 (varies with valence balance); when M is Mn, x=0.05 to 20, and y=99.95 to 80; when M is Co, x=0.05 to 20, and y=99.95 to 80; and when M is Cu, x=0.05 to 20, and y=99.95 to 80. If x is too small, it will be similar to MO without Ce. z The properties are similar, but without the effect of low-temperature oxidation of aromatic volatile organic compounds. If x is too large, the cost will increase and the temperature for oxidizing aromatic volatile organic compounds cannot be further reduced.

[0010] In some embodiments, M is Mn, x=0.05 to 2, y=99.95 to 98, and Ce is distributed on the catalyst surface in a single-atom form (e.g., Ce size is less than 1 nanometer). In some embodiments, M is Co, x=0.05 to 2, y=99.95 to 98, and Ce is distributed on the catalyst surface in a single-atom form (e.g., Ce size is less than 1 nanometer). In some embodiments, M is Cu, x=0.05 to 2, y=99.95 to 98, and Ce is distributed on the catalyst surface in a single-atom form (e.g., Ce size is less than 1 nanometer). Ce in a single-atom form has a better oxygen exchange rate, which can effectively reduce the temperature of oxidizing aromatic volatile organic compounds and reduce the amount of Ce used to reduce costs.

[0011] In some embodiments, the pore size (more than 90% of the pores) of the catalyst for oxidizing aromatic volatile organic compounds is between 2 nm and 20 nm. If the pores are too small, the diffusion rate of reactants and the increase of active sites cannot be increased. If the pores are too large, the probability of contact between reactants and catalysts is reduced.

[0012] In some embodiments, the catalyst for oxidizing aromatic volatile organic compounds does not contain precious metals, and the precious metals include Pt, Pd, Rh, Ru, Au, Ag, or a combination thereof. Since the catalyst does not contain precious metals, the problem of high-temperature sintering of precious metals and reduced activity can be avoided. In addition, since the catalyst of the present disclosure does not contain precious metals, the cost is relatively low.

[0013] The above mesoporous metal oxide Ce x M y O z The preparation method can be as follows: after dissolving a cerium salt (such as Ce(NO3)3·6H2O, CeCl3·7H2O, Ce2(SO4)3·8H2O, or other suitable cerium salts) and an M salt (such as a cobalt salt (such as Co(NO3)2·6H2O, CoCl2·6H2O, CoSO4·7H2O, or other suitable cobalt salts), a manganese salt (such as Mn(NO3)2·4H2O, MnCl2·4H2O, MnSO4·xH2O, or other suitable manganese salts), or a copper salt (such as Cu(NO3)2·3H2O, CuCl2·2H2O, CuSO4, or other suitable copper salts)) in water, adding a surfactant such as P123 colloid (purchased from Sigma-Aldrich), F127 solid (purchased from Sigma-Aldrich), or other suitable surfactants, and forming micelles after ball milling dispersion. Collect the solid dispersed by ball milling and calcine to obtain mesoporous metal oxide Ce x M y O z It is worth noting that the above method is only suitable for forming mesoporous metal oxide Cex M y O z One of the methods is not the only method. A person skilled in the art can use any known method to form the mesoporous metal oxide Ce. x M y O z .

[0014] The method for oxidizing aromatic volatile organic compounds provided in one embodiment of the present disclosure includes: passing aromatic volatile organic compounds and oxygen into a catalyst to oxidize the aromatic volatile organic compounds into water and carbon dioxide. In some embodiments of the present disclosure, the aforementioned oxygen can use air, mixed gas or pure oxygen, as long as oxygen can be provided. In addition, the catalyst used in this method is the same as the aforementioned catalyst, which is not repeated here. It is worth noting that general catalysts must increase the reaction temperature to above 230°C to 250°C to remove aromatic volatile organic compounds. However, in some embodiments of the present disclosure, the temperature of passing aromatic volatile organic compounds and oxygen into the catalyst is 180°C to 230°C. This temperature range can effectively oxidize aromatic volatile organic compounds, such as oxidizing more than 99% of aromatic volatile organic compounds into water and carbon dioxide (there may be a small amount of by-products such as methane and carbon monoxide). If the temperature is too low, the aromatic volatile organic compounds cannot be effectively oxidized. If the temperature is too high, energy consumption is increased without obvious advantages. In some embodiments, the aromatic volatile organic compounds include benzene, toluene, xylene, ethylbenzene, or combinations thereof.

[0015] In order to make the above contents and other purposes, features, and advantages of the present disclosure more clearly understood, preferred embodiments are specifically cited below and described in detail with reference to the accompanying drawings as follows:

[0016] [Example]

[0017] Example 1-1

[0018] 0.22g of Ce(NO3)3·6H2O and 1.13g of Mn(NO3)2·4H2O were weighed and added to the ball mill. 0.34mL of preheated P123 colloid (purchased from Sigma-Aldrich) was added to the ball mill as a surfactant, and zirconium balls for ball milling were added and shaken (frequency was 30Hz) for 40 minutes. After ball milling, the solid was collected and moved to a high temperature furnace and calcined at 300℃ for 6 hours to obtain the mesoporous catalyst Ce. 10 Mn 90 O z . Mesoporous catalyst Ce 10 Mn 90 O z Transmission electron microscopy images of Figure 1A and1B As shown in the transmission electron microscope image, the above catalyst has a mixed structure, and CeO2 is distributed in it in nanometer size.

[0019] According to the teaching of Adsorption Isotherms. In: Gas Adsorption Equilibria. Springer, Boston, MA (2005), the mesoporous catalyst Ce 10 Mn 90 O z The constant temperature adsorption and desorption test showed that it has a mesoporous structure and its BET specific surface area is 23.27 m 2 / g, the average pore size is about 15.9nm, and the pore volume is about 0.09cm 3 / g.

[0020] The mesoporous catalyst Ce was calcined at 700℃, 750℃, and 800℃ respectively. 10 Mn 90 O z After 10 hours, the XRD pattern of the catalyst was measured. Compared with the catalyst before high-temperature calcination, the XRD pattern of the catalyst after calcination has similar signals, indicating that high-temperature calcination does not substantially affect the Ce of the mesoporous catalyst. 10 Mn 90 O z structure.

[0021] Take the above mesoporous catalyst Ce 10 Mn 90 O z After rolling, sieve and fill into the reaction tube for toluene oxidation reaction test. Put an appropriate amount of toluene into the aeration bottle and place it in a constant temperature water tank (temperature setting 15°C), aerate with 1-30mL / min dry air, and then mix with 330-2000mL / min dry air in the mixing bottle. The toluene inlet concentration of the above mixed gas is 180ppm, and the gas hourly space velocity (GHSV) is 59000h -1 The reaction test temperature was 190°C, and Fourier-transform Infrared Spectroscopy (FTIR) was used as the concentration measurement instrument at the front and back ends of the reaction tube. The mixed gas was passed into the reaction tube, and the toluene concentration was measured at the outlet of the reaction tube to confirm the mesoporous catalyst Ce. 10 Mn 90 O z The removal efficiency of toluene. 10 Mn 90 Oz The toluene removal efficiency is 75.2%. The mesoporous catalyst Ce after calcination at 700℃ 10 Mn 90 O z The toluene removal efficiency is 74.9%, and the mesoporous catalyst Ce after calcination at 750℃ 10 Mn 90 O z The toluene removal efficiency of the mesoporous catalyst Ce after calcination at 800℃ was 80.0%. 10 Mn 90 O z The toluene removal efficiency of the mesoporous catalyst Ce is 70.2%. 10 Mn 90 O z It can effectively remove toluene at low temperature, and it still has the property of removing toluene at low temperature after high temperature calcination.

[0022] Take the above mesoporous catalyst Ce 10 Mn 90 O z After rolling, the mixture was sieved and filled into a reaction tube for toluene oxidation test at different temperatures to confirm the toluene removal efficiency of the catalyst at different temperatures. 10 Mn 90 O z T 99 (i.e. the reaction temperature at which the toluene removal efficiency reaches 99%) is 210°C.

[0023] Example 1-2

[0024] Weigh 0.022g of Ce(NO3)3·6H2O and 1.27g of Mn(NO3)2·4H2O and add them to the ball mill. Add 0.34mL of preheated P123 colloid as a surfactant to the ball mill, add zirconium balls for ball milling and shake (frequency is 30Hz) for 40 minutes. Collect the solid after ball milling and move it to a high temperature furnace, calcined at 300℃ for 6 hours to obtain the mesoporous catalyst Ce1Mn 99 O z . Mesoporous catalyst Ce1Mn 99 O z Transmission electron microscopy images of Figure 2A and 2B As shown. Figure 2A and 2B It can be seen that Ce is distributed on the catalyst surface in the form of single atoms.

[0025] Take the above mesoporous catalyst Ce1Mn 99 O zAfter rolling, the mixture was sieved and filled into a reaction tube, and toluene oxidation reaction tests were carried out at different temperatures to confirm the toluene removal efficiency of the catalyst at different temperatures. The test conditions of Example 1-2 can be the same as those of Example 1-1. Mesoporous catalyst Ce1Mn 99 O z T 99 190℃. Since the mesoporous manganese oxide has a highly dispersed Ce single atom (less than 1 nanometer) structure, T can be further reduced. 99 temperature.

[0026] Examples 1-3

[0027] Weigh 0.575g of Ce(NO3)3·6H2O and 0.775g of Mn(NO3)2·4H2O and add them to the ball mill. Add 0.34mL of preheated P123 colloid as a surfactant to the ball mill, add zirconium balls for ball milling, and shake (frequency is 30Hz) for 40 minutes. Collect the solid after ball milling and move it to a high temperature furnace, calcined at 300℃ for 6 hours to obtain the mesoporous catalyst Ce. 30 Mn 70 O z . Mesoporous catalyst Ce 30 Mn 70 O z Transmission electron microscopy images of Figure 3A and 3B shown.

[0028] Take the above mesoporous catalyst Ce 30 Mn 70 O z After rolling, the mixture was sieved and filled into a reaction tube, and toluene oxidation reaction tests were carried out at different temperatures to confirm the toluene removal efficiency of the catalyst at different temperatures. The test conditions of Example 1-3 can be the same as the test conditions of Example 1-1. Mesoporous Catalyst Ce 30 Mn 70 O z T 99 At 210℃, the mesoporous catalyst Ce 10 Mn 90 O z T 99 Since the cost of Ce is higher than that of Mn, the cost of Example 1-3 will be higher than that of Example 1-1 without further reducing T 99 .

[0029] Examples 1-4

[0030] Weigh 0.011g of Ce(NO3)3·6H2O and 1.27g of Mn(NO3)2·4H2O and add them to the ball mill. Add 0.34mL of preheated P123 colloid as a surfactant to the ball mill, add zirconium balls for ball milling, and shake (frequency is 30Hz) for 40 minutes. Collect the solid after ball milling and move it to a high temperature furnace, calcined at 300℃ for 6 hours to obtain the mesoporous catalyst Ce. 0.5 Mn 99.5 O z .

[0031] Take the above mesoporous catalyst Ce 0.5 Mn 99.5 O z After rolling, the mixture was sieved and filled into a reaction tube, and toluene oxidation reaction tests were performed at different temperatures to confirm the toluene removal efficiency of the catalyst at different temperatures. The test conditions of Example 1-4 can be the same as the test conditions of Example 1-1. Mesoporous Catalyst Ce 0.5 Mn 99.5 O z T 99 is 205℃. Although the highly dispersed Ce still has a single atomic form, the concentration is too low so T 99 Higher than Example 1-2.

[0032] Comparative Example 1

[0033] Weigh 1.29g of Mn(NO3)2·4H2O and add it to the ball mill. Add 0.34mL of preheated P123 colloid as a surfactant to the ball mill, add zirconium balls for ball milling and shake (frequency is 30Hz) for 40 minutes. Collect the solid after ball milling and move it to a high temperature furnace, calcining it at 300℃ for 6 hours to obtain the mesoporous catalyst MnO z .

[0034] Take the above mesoporous catalyst MnO z After rolling, the mixture was sieved and filled into a reaction tube, and toluene oxidation reaction tests were carried out at different temperatures to confirm the efficiency of the catalyst in removing toluene at different temperatures. The test conditions of Comparative Example 1 can be the same as those of Example 1-1. Mesoporous Catalyst MnO z T 99 230°C. From the comparison between Comparative Example 1 and Examples 1-1 to 1-4, it can be seen that Ce x Mn y O z T 99 Lower than MnO z T 99 .

[0035] Example 2-1

[0036] Weigh 0.212g of Ce(NO3)3·6H2O and 1.28g of Co(NO3)2·6H2O and add them to the ball mill. Add 0.39mL of preheated P123 colloid as a surfactant to the ball mill, add zirconium balls for ball milling, and shake (frequency is 30Hz) for 40 minutes. Collect the solid after ball milling and move it to a high temperature furnace, calcined at 300℃ for 6 hours to obtain the mesoporous catalyst Ce. 10 Co 90 O z .

[0037] Take the above mesoporous catalyst Ce 10 Co 90 O z After rolling, the mixture was sieved and filled into a reaction tube, and toluene oxidation reaction tests were carried out at different temperatures to confirm the toluene removal efficiency of the catalyst at different temperatures. The test conditions of Example 2-1 can be the same as those of Example 1-1. Mesoporous Catalyst Ce 10 Co 90 O z T 99 It is 205℃.

[0038] Example 2-2

[0039] 0.022g of Ce(NO3)3·6H2O and 1.47g of Co(NO3)2·6H2O were weighed and added to the ball mill. 0.39mL of preheated P123 colloid was added to the ball mill as a surfactant, and zirconium balls were added for ball milling and then oscillated (frequency was 30Hz) for 40 minutes. After ball milling, the solid was collected and moved to a high temperature furnace and calcined at 300℃ for 6 hours to obtain the mesoporous catalyst Ce1Co 99 O z .

[0040] Take the above mesoporous catalyst Ce1Co 99 O z After rolling, the mixture was sieved and filled into a reaction tube, and toluene oxidation reaction tests were carried out at different temperatures to confirm the toluene removal efficiency of the catalyst at different temperatures. The test conditions of Example 2-1 can be the same as those of Example 1-1. Mesoporous Catalyst Ce1Co 99 O z T 99 Since highly dispersed Ce has a single atomic form, T can be further reduced. 99 temperature.

[0041] Comparative Example 2

[0042] 1.492 g of Co(NO3)2·6H2O was weighed and added to the ball mill. 0.35 mL of preheated P123 colloid was added to the ball mill as a surfactant, and zirconium balls were added for ball milling and then oscillated (frequency was 30 Hz) for 40 minutes. After ball milling, the solid was collected and moved to a high temperature furnace and calcined at 300°C for 6 hours to obtain the mesoporous catalyst CoO z .

[0043] Take the above mesoporous catalyst CoO z After rolling, the mixture was sieved and filled into a reaction tube, and toluene oxidation reaction tests were carried out at different temperatures to confirm the efficiency of the catalyst in removing toluene at different temperatures. The test conditions of Comparative Example 2 can be the same as those of Example 1-1. Mesoporous Catalyst CoO z T 99 230°C. From the comparison between Comparative Example 2 and Examples 2-1 to 2-2, it can be seen that Ce x Co y O z T 99 Lower than CoO z T 99 .

[0044] Example 3-1

[0045] Weigh 0.207g of Ce(NO3)3·6H2O and 1.035g of Cu(NO3)2·3H2O and add them to the ball mill. Add 0.34mL of preheated P123 colloid as a surfactant to the ball mill, add zirconium balls for ball milling, and shake (frequency is 30Hz) for 40 minutes. Collect the solid after ball milling and move it to a high temperature furnace, calcined at 300℃ for 6 hours to obtain the mesoporous catalyst Ce. 10 Cu 90 O z .

[0046] Take the above mesoporous catalyst Ce 10 Cu 90 O z After rolling, the mixture was sieved and filled into a reaction tube, and toluene oxidation reaction tests were carried out at different temperatures to confirm the toluene removal efficiency of the catalyst at different temperatures. The test conditions of Example 3-1 can be the same as those of Example 1-1. Mesoporous Catalyst Ce 10 Cu 90 O z T 99 It is 220℃.

[0047] Example 3-2

[0048] Weigh 0.022g of Ce(NO3)3·6H2O and 1.22g of Cu(NO3)2·3H2O and add them to the ball mill. Add 0.34mL of preheated P123 colloid as a surfactant to the ball mill, add zirconium balls for ball milling and shake (frequency is 30Hz) for 40 minutes. Collect the solid after ball milling and move it to a high temperature furnace, calcined at 300℃ for 6 hours to obtain the mesoporous catalyst Ce1Cu 99 O z .

[0049] Take the above mesoporous catalyst Ce1Cu 99 O z After rolling, the mixture was sieved and filled into a reaction tube, and toluene oxidation reaction tests were performed at different temperatures to confirm the toluene removal efficiency of the catalyst at different temperatures. The test conditions of Example 3-2 can be the same as those of Example 1-1. 99 O z T 99 Since highly dispersed Ce has a single atomic form, T can be further reduced. 99 temperature.

[0050] Comparative Example 3-1

[0051] 1.272g of Ce(NO3)3·6H2O and 0.078g of Cu(NO3)2·3H2O were weighed and added to the ball mill. 0.34mL of preheated P123 colloid was added to the ball mill as a surfactant, and zirconium balls were added for ball milling and then oscillated (frequency was 30Hz) for 40 minutes. After ball milling, the solid was collected and moved to a high temperature furnace and calcined at 300℃ for 6 hours to obtain the mesoporous catalyst Ce. 90 Cu 10 O z .

[0052] Take the above mesoporous catalyst Ce 90 Cu 10 O z After rolling, the mixture was sieved and filled into a reaction tube, and toluene oxidation reaction tests were carried out at different temperatures to confirm the toluene removal efficiency of the catalyst at different temperatures. The test conditions of Comparative Example 3-1 can be the same as those of Example 1-1. Mesoporous Catalyst Ce 90 Cu 10 O z T 99 is 240℃.

[0053] Comparative Example 3-2

[0054] Weigh 1.242g of Cu(NO3)2·3H2O and add it to the ball mill. Add 0.34mL of preheated P123 colloid as a surfactant to the ball mill, add zirconium balls for ball milling and shake (frequency is 30Hz) for 40 minutes. Collect the solid after ball milling and move it to a high temperature furnace, calcining it at 300℃ for 6 hours to obtain the mesoporous catalyst CuO. z .

[0055] Take the above mesoporous catalyst CuO z After rolling, the mixture was sieved and filled into a reaction tube, and toluene oxidation reaction tests were carried out at different temperatures to confirm the efficiency of the catalyst in removing toluene at different temperatures. The test conditions of Comparative Example 3-2 can be the same as those of Example 1-1. Mesoporous Catalyst CuO z T 99 245°C. From the comparison between Comparative Example 3-2 and Examples 3-1 to 3-3, it can be seen that Ce x Cu y O z T 99 Lower than CuO z T 99 .

[0056] Comparative Example 4

[0057] Weigh 0.022g of Ce(NO3)3·6H2O and 2.04g of Fe(NO3)3·9H2O and add them to the ball mill. Add 0.54g of preheated P123 colloid as a surfactant to the ball mill, add zirconium balls for ball milling and shake (frequency is 30Hz) for 40 minutes. Collect the solid after ball milling and move it to a high temperature furnace, calcined at 300℃ for 6 hours to obtain the mesoporous catalyst Ce. 10 Fe 90 O z .

[0058] Take the above mesoporous catalyst Ce 10 Fe 90 O z After rolling, the mixture was sieved and filled into a reaction tube, and toluene oxidation reaction tests were carried out at different temperatures to confirm the toluene removal efficiency of the catalyst at different temperatures. The test conditions of Comparative Example 4 can be the same as those of Example 1-1. Mesoporous Catalyst Ce 10 Fe 90 O z T 99 is 270℃. From Comparative Example 4, it can be seen that when Ce x M y O z When M is a metal other than Mn, Co, and Cu, such as Fe, it does not have the effect of removing toluene at low temperature.

[0059] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above description is only a specific embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A catalyst for oxidizing aromatic volatile organic compounds, characterized in that: comprising a mesoporous metal oxide; The chemical formula of the mesoporous metal oxide is Ce x M y O z , Ce is distributed in the form of single atoms on M oxide, wherein M is Mn, Co, or Cu, x+y=100, and z=100 to 200; When M is Mn, x = 0.05 to 1, and y = 99.95 to 99; When M is Co, x=0.05 to 1, and y=99.95 to 99; and When M is Cu, x=0.05 to 1, and y=99.95 to 99.

2. The catalyst for oxidizing aromatic volatile organic compounds according to claim 1, wherein the pore size is between 2 nm and 20 nm.

3. The catalyst for oxidizing aromatic volatile organic compounds according to claim 1, which does not contain a noble metal, and the noble metal comprises Pt, Pd, Rh, Ru, Au, Ag, or a combination thereof.

4. A method for oxidizing aromatic volatile organic compounds, characterized in that: include: Passing an aromatic volatile organic compound and oxygen through a catalyst to oxidize the aromatic volatile organic compound into water and carbon dioxide, wherein the catalyst comprises a mesoporous metal oxide, and the temperature at which the aromatic volatile organic compound and oxygen are passed through the catalyst is 180° C. to 230° C.; The chemical formula of the mesoporous metal oxide is Ce x M y O z , Ce is distributed in the form of single atoms on M oxide, wherein M is Mn, Co, or Cu, x+y=100, and z=100 to 200; When M is Mn, x = 0.05 to 1, and y = 99.95 to 99; When M is Co, x=0.05 to 1, and y=99.95 to 99; and When M is Cu, x=0.05 to 1, and y=99.95 to 99. 5 . The method for oxidizing aromatic volatile organic compounds according to claim 4 , wherein the aromatic volatile organic compounds comprise benzene, toluene, xylene, or a combination thereof. 6 . The method for oxidizing aromatic volatile organic compounds according to claim 4 , wherein the pore size of the catalyst is between 2 nm and 20 nm.

7. The method for oxidizing aromatic volatile organic compounds according to claim 4, wherein the catalyst does not contain a noble metal, and the noble metal comprises Pt, Pd, Rh, Ru, Au, Ag, or a combination thereof.

Images