A light-heat extraction catalytic oxidation desulfurization catalyst, a preparation method and application thereof

Abstract

The present application relates to the technical field of fuel desulfurization, and particularly relates to a photo-thermal extraction catalytic oxidation desulfurization catalyst, a preparation method and application thereof. The raw material of the catalyst comprises [Mo6O 19 ](NC 18 H 36 )2, NH2-MIL-125(Ti) and g-C3N4, and the catalyst Mo6 / NH2-MIL-125(Ti) / g-C3N4 is prepared by using an evaporation solvent method, wherein the molar ratio of Ti in NH2-MIL-125(Ti) to Mo in [Mo6O 19 ](NC 18 H 36 )2 is 1:0.1-1.0. The evaporation solvent method used in the present application has simple preparation process, controllable morphology and high stability, and the prepared catalyst has excellent catalytic effect in a photo-thermal extraction catalytic oxidation desulfurization system, and can be widely used for industrial desulfurization of sulfur-containing fuels.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fuel desulfurization technology, and particularly relates to a photo-thermal extraction catalytic oxidation desulfurization catalyst and a preparation method and application thereof. BACKGROUND

[0002] When sulfur-containing compounds are combusted, sulfur dioxide is generated, which pollutes the air and forms acid rain. Moreover, sulfur dioxide in the air can enter the human body through the respiratory process, causing damage to the respiratory system.

[0003] Among them, the combustion of sulfur-containing fuels is one of the sources of sulfur dioxide pollution. At present, sulfur oxide pollution caused by the combustion of sulfur-containing fuels can be prevented and treated by removing the sulfur-containing compounds in the fuel before combustion, that is, fuel desulfurization technology.

[0004] Among many desulfurization technologies, photo-thermal extraction catalytic oxidation desulfurization technology has the characteristics of simple operation and environmental friendliness. Among them, g-C3N4 is a cheap and readily available semiconductor material, and its excellent physical and chemical stability and light response have become a commonly used catalytic material in the field of photocatalysis. However, this material has the disadvantages of low specific surface area and relatively high recombination rate of photo-generated electron-hole pairs, which limits its photocatalytic performance. However, POMs have fast electron mobility, and loading POMs on g-C3N4 can promote the transfer of photo-generated electrons in the photocatalytic reaction process. However, POMs have small specific surface area and are prone to agglomeration, which cannot fully exert their advantages. SUMMARY

[0005] The purpose of the present application is to provide a photo-thermal extraction catalytic oxidation desulfurization catalyst and a preparation method and application thereof, and to improve the desulfurization effect of sulfur-containing fuels.

[0006] In order to achieve the above-mentioned purpose of the application, the present application provides the following technical solutions:

[0007] A photo-thermal extraction catalytic oxidation desulfurization catalyst, the preparation raw materials comprising [Mo6O 19 ](NC 18 H 36 )2, NH2-MIL-125(Ti) and g-C3N4.

[0008] Among them, the molar ratio of Ti in NH2-MIL-125(Ti) to Mo in [Mo6O 19 ](NC 18 H 36 )2 is 1:0.1-1.0.

[0009] Optionally, the mass ratio of the NH2-MIL-125(Ti) and the g-C3N4 is 0.1-1:1.

[0010] The application provides a preparation method of the photo-thermal extraction catalytic oxidative desulfurization catalyst.

[0011] [Mo6O 19 ](NC 18 H 36 )2、NH2-MIL-125(Ti) and g-C3N4 are mixed in an organic solvent, and then ultrasonic treatment and heat treatment are sequentially performed to obtain Mo6 / NH2-MIL-125(Ti) / g-C3N4, which is the photo-thermal extraction catalytic oxidative desulfurization catalyst.

[0012] Optionally, the organic solvent comprises isopropyl alcohol.

[0013] Optionally, the frequency of the ultrasonic treatment is 70-90 Hz, and the time is 20-45 min.

[0014] Optionally, the heat treatment is performed by water bath heating, and the temperature of the heat treatment is 50-75 DEG C.

[0015] The application further provides an application of the photo-thermal extraction catalytic oxidative desulfurization catalyst in desulfurization of a sulfur-containing fuel.

[0016] Optionally, the method for desulfurization of the sulfur-containing fuel comprises the following steps:

[0017] The sulfur-containing fuel, the catalyst, the extractant and the oxidant are mixed, and an oxidation reaction occurs under light irradiation to perform desulfurization.

[0018] The catalyst is the photo-thermal extraction catalytic oxidative desulfurization catalyst described in the above technical solution or the photo-thermal extraction catalytic oxidative desulfurization catalyst prepared by the preparation method described in the above technical solution.

[0019] Optionally, the sulfur-containing fuel comprises vehicle fuel, and the use amount ratio of the sulfur-containing fuel to the catalyst is 15 mL: 0.01-0.03 g.

[0020] The extractant comprises 1-butyl-3-methylimidazolium hexafluorophosphate, and the volume ratio of the sulfur-containing fuel to the extractant is 5-15:1.

[0021] The oxidant comprises H2O2, and the volume ratio of the sulfur-containing fuel to the oxidant is 15:0.072-0.096.

[0022] Optionally, the light source of the light irradiation is a 300 W xenon lamp, the reaction temperature of the oxidation reaction is 50-70 DEG C, and the time is 60-120 min.

[0023] The application provides a light-heat extraction catalytic oxidation desulfurization catalyst material Mo6 / NH2-MIL-125(Ti) / g-C3N4, which has high catalytic activity and has an ultra-deep desulfurization effect in a light-heat extraction catalytic oxidation desulfurization system.

[0024] The application utilizes an evaporation solvent method to prepare the light-heat extraction catalytic oxidation desulfurization catalyst Mo6 / NH2-MIL-125(Ti) / g-C3N4. 19 ](NC 18 H 36 )2 provides an anionic cluster Mo6 which interacts with NH2-MIL-125(Ti) through electrostatic force, so that the Mo6 enters the channel of the NH2-MIL-125(Ti) or is loaded on the surface of the NH2-MIL-125(Ti) to form Mo6 / NH2-MIL-125(Ti).

[0025] In the light-heat extraction catalytic oxidation desulfurization system, there are three phases, namely an ionic liquid phase, a water phase and an oil phase (containing a sulfur-containing fuel). When the light-heat extraction catalytic oxidation desulfurization catalyst Mo6 / NH2-MIL-125(Ti) / g-C3N4 of the application is used as a catalyst in the light-heat extraction catalytic oxidation desulfurization system, the catalyst is dispersed in the ionic liquid phase. Under stirring, the three phases are fully contacted to form a microemulsion system, and under the synergistic effect of light and heat, the sulfur-containing compounds in the oil phase are first extracted into the ionic liquid phase and fully contacted with the catalyst; the light makes the g-C3N4 and NH2-MIL-125(Ti) in the catalyst generate photo-generated electrons and holes. Among them, the holes on the valence band of the NH2-MIL-125(Ti) have strong oxidizing properties, and the lone pair electrons on the sulfur atoms in the sulfur-containing compounds are easily captured by the holes on the surface of the catalyst, and then the captured electrons are combined with the ·O2 - to complete oxidation;

[0026] Moreover, the z-type heterojunction structure formed between the g-C3N4 and the NH2-MIL-125(Ti) can promote the formation of ·O2 - , prolong the lifetime of h + , and enable the ·O2 - and h + to participate in the photocatalytic reaction as main active species. The electrons on the conduction band of the NH2-MIL-125(Ti) migrate to the valence band of the g-C3N4. Under the influence of the heterojunction structure, the photo-generated electrons of the g-C3N4 and the NH2-MIL-125(Ti) are quickly transferred; meanwhile, the hydrogen peroxide is decomposed into water and oxygen, and the O2 / ·O2 -The standard redox potential of the Mo6-NH2-MIL-125 (Ti) / g-C3N4 catalyst is more positive than the conduction band position of g-C3N4, and the O2 produced by the decomposition of H2O2 can combine with electrons on the conduction band of g-C3N4 to form ·O2 - participate in the oxidation of sulfur-containing substances;

[0027] Meanwhile, the Mo6 in the Mo6-NH2-MIL-125 (Ti) / g-C3N4 catalyst contains a Mo=O structure, and the reaction of Mo=O with H2O2 produces active component Mo(O2), which can oxidize sulfur-containing compounds, and Mo(O2) is converted back to the Mo=O structure until H2O2 is completely consumed.

[0028] The substances formed after the oxidation of sulfur-containing compounds have strong polar properties and can be extracted by the extractant (ionic liquid), so that the sulfur-containing compounds in the oil phase are removed to obtain clean fuel. Moreover, in the photo-thermal extraction catalytic oxidation desulfurization system, the ionic liquid acts as an extractant and a reaction medium, and also stabilizes the active sites during the desulfurization process; the desulfurization reaction is an endothermic reaction, and heating the photo-thermal extraction catalytic oxidation desulfurization system can further accelerate the rate of the desulfurization reaction and improve the desulfurization effect of the photo-thermal extraction catalytic oxidation desulfurization system.

[0029] The evaporation solvent method adopted in the application has simple preparation process, controllable morphology and high stability.

[0030] The photo-thermal extraction catalytic oxidation desulfurization catalyst Mo6 / NH2-MIL-125 (Ti) / g-C3N4 provided by the application can be applied to a photo-thermal extraction catalytic oxidation desulfurization system, and 500 ppm of DBT in simulated oil can be completely removed within 120 min when 0.03 g of the catalyst with a Ti:Mo ratio of 1:0.5 is used for photo-thermal extraction catalytic oxidation desulfurization at 70 DEG C, and the photo-thermal extraction catalytic oxidation desulfurization system has excellent catalytic effect and can be widely used for industrial desulfurization of sulfur-containing fuels. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The XRD spectrum of the photo-thermal extraction catalytic oxidation desulfurization catalyst with different Ti:Mo ratios prepared in Examples 1-5;

[0032] Figure 2 The FT-IR spectrum of the photo-thermal extraction catalytic oxidation desulfurization catalyst with different Ti:Mo ratios prepared in Examples 1-5;

[0033] Figure 3 The SEM photo of the photo-thermal extraction catalytic oxidation desulfurization catalyst in Example 3;

[0034] Figure 4Fig. 1 shows a graph of the change in desulfurization efficiency with time in a photo-thermal extraction catalytic oxidative desulfurization reaction using the photo-thermal extraction catalytic oxidative desulfurization catalysts of different Ti:Mo ratios prepared in Examples 1 to 5. DETAILED DESCRIPTION

[0035] The present application provides a photo-thermal extraction catalytic oxidative desulfurization catalyst, and the preparation raw material comprises [Mo6O 19 ](NC 18 H 36 )2, NH2-MIL-125(Ti), and g-C3N4.

[0036] The molar ratio of Ti in NH2-MIL-125(Ti) to Mo in [Mo6O 19 ](NC 18 H 36 )2 is 1:0.1-1.0.

[0037] In the present application, the molar ratio of Ti in NH2-MIL-125(Ti) to Mo in [Mo6O 19 ](NC 18 H 36 )2 is preferably 1:0.2-0.85, further preferably 1:0.3-0.75, and more further preferably 1:0.4-0.5.

[0038] In the present application, the preparation method of the [Mo6O 19 ](NC 18 H 36 )2 preferably comprises: mixing Na2MoO4·2H2O and dimethylformamide and stirring, then adding acetic anhydride, and using concentrated hydrochloric acid to obtain a reaction solution, heating the reaction solution, then filtering while hot, adding a tetrabutylammonium bromide solution to the filtrate to obtain yellow crystals, sequentially using ethanol and diethyl ether to wash, then recrystallizing in acetone to obtain [Mo6O 19 ](NC 18 H 36 )2.

[0039] In the present application, the use amount ratio of the Na2MoO4·2H2O to dimethylformamide is preferably 58 g:100 mL.

[0040] The volume ratio of the dimethylformamide to acetic anhydride is preferably 100:48.

[0041] The concentrated hydrochloric acid is preferably 12 mol / L, and the volume ratio of the dimethylformamide to the concentrated hydrochloric acid is preferably 100:33.

[0042] The heating temperature is preferably 60-80 DEG C, further preferably 65-75 DEG C, and more preferably 70-72 DEG C; and the time is preferably 15-30 min, further preferably 20-25 min.

[0043] The tetrabutylammonium bromide solution is preferably 1 mol / L, and the volume ratio of dimethylformamide to tetrabutylammonium bromide solution is preferably 100:100.

[0044] The washing is performed using ethanol and diethyl ether, and the number of washing times and the amount of ethanol and diethyl ether are adjusted according to actual conditions.

[0045] In the present application, the amount of acetone used in the recrystallization process is not fixed, and can be adjusted according to actual conditions.

[0046] In the present application, the mass ratio of NH2-MIL-125(Ti) to g-C3N4 is preferably 0.1-1:1, and further preferably 0.5-1:1.

[0047] The present application provides a preparation method of the photo-thermal extraction catalytic oxidation desulfurization catalyst, comprising the following steps:

[0048] Mixing [Mo6O 19 ](NC 18 H 36 )2, NH2-MIL-125(Ti) and g-C3N4 in an organic solvent, sequentially performing ultrasonic treatment and heat treatment to obtain Mo6 / NH2-MIL-125(Ti) / g-C3N4, which is the photo-thermal extraction catalytic oxidation desulfurization catalyst.

[0049] In the preparation method, the organic solvent preferably comprises isopropyl alcohol.

[0050] The amount of the organic solvent used is not fixed, and can be adjusted according to actual reaction conditions.

[0051] In the preparation method, the frequency of the ultrasonic treatment is preferably 70-90 Hz, further preferably 75-88 Hz, and more preferably 80-85 Hz; and the time is preferably 20-45 min, further preferably 25-40 min, and more preferably 30-35 min.

[0052] In the preparation method, the heat treatment is preferably performed by water bath heating, and the temperature of the heat treatment is preferably 50-75 DEG C, further preferably 55-70 DEG C, and more preferably 60-65 DEG C, and the water bath heating is performed until the solvent is completely evaporated.

[0053] The present application also provides application of the photo-thermal extraction catalytic oxidation desulfurization catalyst in desulfurization of sulfur-containing fuels.

[0054] In the present application, the method for desulfurization of the sulfur-containing fuel preferably comprises the following steps:

[0055] Mixing the sulfur-containing fuel, the catalyst, the extractant and the oxidant, and carrying out the oxidation reaction under the light condition to desulfurize;

[0056] The catalyst is the photo-thermal extraction catalytic oxidation desulfurization catalyst as described in the above technical solution or prepared by the preparation method as described in the above technical solution.

[0057] In the present application, the sulfur-containing fuel preferably comprises the vehicle fuel, and the usage ratio of the sulfur-containing fuel to the catalyst is preferably 15 mL: 0.01-0.03 g, further preferably 15 mL: 0.15-0.03 g, and more further preferably 15 mL: 0.2-0.3 g.

[0058] The extractant preferably comprises 1-butyl-3-methylimidazolium hexafluorophosphate, and the volume ratio of the sulfur-containing fuel to the extractant is preferably 5-15: 1, further preferably 9-15: 1, and more further preferably 10-14: 1.

[0059] The oxidant preferably comprises H2O2, and the volume ratio of the sulfur-containing fuel to the oxidant is preferably 15: 0.72-0.96, further preferably 15: 0.72-0.88, and more further preferably 15: 0.72-0.80.

[0060] In the present application, the light source of the light is preferably a 300 W xenon lamp, the reaction temperature of the oxidation reaction is preferably 70℃, and the time is preferably 60-120 min, further preferably 80-110 min, and more further preferably 90-100 min.

[0061] The technical solutions provided by the present application are described in detail below in combination with examples, but they should not be understood as limiting the protection scope of the present application.

[0062] Example 1

[0063] Mix 58 g of Na2MoO4·2H2O with 100 mL of dimethylformamide and stir, then add 48 mL of acetic anhydride and use 33 mL of concentrated hydrochloric acid (concentration of 12 mol / L) to acidify to obtain a reaction solution, heat the reaction solution to 70℃ and react for 20 min, then filter while hot, add 100 mL of tetrabutylammonium bromide solution (1 mol / L) to the filtrate to obtain 42 g of yellow crystals, wash with ethanol, ether in sequence, and recrystallize with acetone to obtain [Mo6O 19 ](NC 18 H 36)2.

[0064] 0.00825g of [Mo6O 19 ](NC 18 H 36 )2, 0.1 g of NH2-MIL-125(Ti) and 0.1 g of g-C3N4 were dissolved in 8 mL of isopropanol and treated with 80 Hz ultrasound for 30 min, followed by water bath heating at 60 °C to dryness to remove isopropanol. The yellow powder obtained was the photo-thermal extraction catalytic oxidation desulfurization catalyst Mo6 / NH2-MIL-125(Ti) / g-C3N4, in which the molar ratio of Ti:Mo was 1:0.1.

[0065] Example 2

[0066] 0.02475g of [Mo6O 19 ](NC 18 H 36 )2, 0.1 g of NH2-MIL-125(Ti) and 0.1 g of g-C3N4 were dissolved in 8 mL of isopropanol and treated with 80 Hz ultrasound for 30 min, followed by water bath heating at 60 °C to dryness to remove isopropanol. The yellow powder obtained was the photo-thermal extraction catalytic oxidation desulfurization catalyst Mo6 / NH2-MIL-125(Ti) / g-C3N4, in which the molar ratio of Ti:Mo was 1:0.3.

[0067] Example 3

[0068] 0.04125g of [Mo6O 19 ](NC 18 H 36 )2, 0.1 g of NH2-MIL-125(Ti) and 0.1 g of g-C3N4 were dissolved in 8 mL of isopropanol and treated with 80 Hz ultrasound for 30 min, followed by water bath heating at 60 °C to dryness to remove isopropanol. The yellow powder obtained was the photo-thermal extraction catalytic oxidation desulfurization catalyst Mo6 / NH2-MIL-125(Ti) / g-C3N4, in which the molar ratio of Ti:Mo was 1:0.5.

[0069] Example 4

[0070] 0.07013g of [Mo6O 19 ](NC 18 H 36)2, 0.1 g of NH2-MIL-125(Ti) and 0.1 g of g-C3N4 were dissolved in 8 mL of isopropanol and treated with 80 Hz ultrasonic for 30 min, then heated to dryness by water bath at 60 °C to remove isopropanol, the yellow powder obtained was the photo-thermal extraction catalytic oxidation desulfurization catalyst Mo6 / NH2-MIL-125(Ti) / g-C3N4 catalyst, wherein the molar ratio of Ti:Mo was 1:0.85.

[0071] Example 5

[0072] 0.0825 g of [Mo6O 19 ](NC 18 H 36 )2, 0.1 g of NH2-MIL-125(Ti) and 0.1 g of g-C3N4 were dissolved in 8 mL of isopropanol and treated with 80 Hz ultrasonic for 30 min, then heated to dryness by water bath at 60 °C to remove isopropanol, the yellow powder obtained was the photo-thermal extraction catalytic oxidation desulfurization catalyst Mo6 / NH2-MIL-125(Ti) / g-C3N4 catalyst, wherein the molar ratio of Ti:Mo was 1:1.

[0073] The photo-thermal extraction catalytic oxidation desulfurization catalysts prepared in Examples 1-5 were subjected to XRD detection, and the obtained XRD spectra are shown in Figure 1 ;

[0074] The photo-thermal extraction catalytic oxidation desulfurization catalysts prepared in Examples 1-5 were subjected to infrared spectrum detection in the wavelength range of 400-3500 cm -1 , and the obtained FT-IR spectra are shown in Figure 2 ;

[0075] The photo-thermal extraction catalytic oxidation desulfurization catalyst prepared in Example 3 was subjected to SEM detection, and the obtained SEM spectrum is shown in Figure 3 .

[0076] The photo-thermal extraction catalytic oxidation desulfurization catalysts prepared in Examples 1-5 were subjected to XRD detection, and the obtained XRD spectra are shown in Figure 1It can be found that the characteristic peaks of NH2-MIL-125(Ti) at 6.7°, 9.7° and 11.6° in 2θ correspond to its (101), (200) and (211) crystal planes, respectively; the diffraction peaks of g-C3N4 at 12.9° and 27.7° in 2θ correspond to the (100) plane formed by the stacking of triazine ring unit structure in the g-C3N4 plane and the (002) plane formed by the stacking of conjugated aromatic layers, respectively; and the diffraction peaks of the composite catalyst in the range of 5-15° correspond to the MoO units in Mo6 structure, which indicates the successful loading of Mo6 in the catalyst. Thus, it can be proved that the ternary composite catalyst Mo6-NH2-MIL-125(Ti) / g-C3N4 is successfully obtained. With the increase of Mo6 loading amount, the diffraction peak intensity of Mo6 also increases.

[0077] By Figure 2 It can be found that the FT-IR spectrum of g-C3N4 shows characteristic peaks at 1232 cm -1 , 1317 cm -1 , 1539 cm -1 and 1632 cm -1 , which correspond to the typical stretching vibration modes of C-N heterocycle. The peak at 808 cm -1 is caused by the vibration of triazine ring (Region I). For NH2-MIL-125(Ti), two small peaks at 3450 and 3336 cm -1 appear in the infrared spectrum, which are caused by the stretching vibration of -NH produced by the organic linker. The characteristic peaks in the range of 435-770 cm -1 all belong to the vibration of O-Ti-O (Region II). But the displayed positions are slightly shifted, which further confirms the interaction between Mo6-NH2-MIL-125(Ti) and g-C3N4. In the infrared spectrum of Mo6, the characteristic peaks at 954, 880, 789, 596 and 428 cm -1 correspond to the ν(Mo=O(t)), ν(Mo-O(b)-Mo) and ν(Mo-O(c)-Mo) vibrations in its structure, respectively. This indicates that the structure of Lindqvist-type POMs is retained in the composite catalyst.

[0078] By Figure 3 It can be found that the octahedral crystals of NH2-MIL-125(Ti) are loaded on the layered structure of g-C3N4, and the Mo6 nanoparticles are uniformly distributed on NH2-MIL-125(Ti) / g-C3N4.

[0079] Application Example

[0080] The photo-thermal extraction catalytic oxidation desulfurization catalysts prepared in Examples 1-5 are subjected to desulfurization performance test.

[0081] Using a n-octane solution containing 500 ppm dibenzothiophene (DBT) as a simulated sulfur-containing fuel, 15 mL of the simulated sulfur-containing fuel was placed in a round-bottom flask and kept at a constant temperature of 70°C for 15 min. Then, 0.03 g of the photo-thermal extraction catalytic oxidation desulfurization catalyst prepared in Examples 1-5 was added, and the mixture was stirred in the dark for 30 min. After stirring, 1 mL of 1-butyl-3-methylimidazolium hexafluorophosphate and 72 μL of H₂O₂ were added, followed by irradiation with a 300 W xenon lamp. Desulfurization was performed using a light source. Supernatant oil samples were collected at 20, 40, 60, 80, 100, and 120 minutes after the start of illumination and analyzed using high-performance liquid chromatography (HPLC) (using a DB-5 column (30m × 0.32mm × 0.25μm), injection volume 1μL, injection port temperature 20℃, detector temperature 250℃, column oven temperature 150℃, and internal standard method to calculate DBT content). The desulfurization performance of the catalyst was determined, and the results are as follows: Figure 4 As shown;

[0082] pass Figure 4 It can be observed that when the Ti:Mo molar ratio is too high or too low, the catalytic desulfurization efficiency is low. Specifically, after 60 min of reaction, when Ti:Mo = 1:0.5, the desulfurization efficiency of 0.03 g of Mo6 / NH2-MIL-125(Ti) / g-C3N4 catalyst is approximately 99.7%.

[0083] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A kind of light The thermal extraction catalytic oxidation desulfurization catalyst is characterized by, The raw materials for preparation include [Mo6O] 19 ](NC 18 H 36 2. NH2 MIL 125(Ti) and g C3N4; Among them, NH2 MIL In 125(Ti), Ti and [Mo6O] 19 ](NC 18 H 36 The molar ratio of Mo in 2 is 1:0.1~1.0; The light The preparation method of the thermal extraction catalytic oxidation desulfurization catalyst includes the following steps: [Mo6O] 19 ](NC 18 H 36 2. NH2 MIL 125(Ti) and g C3N4 was mixed in an organic solvent and then subjected to ultrasonic and heat treatments in sequence to obtain Mo6 / NH2. MIL 125(Ti) / g C3N4 is the light mentioned above. Thermal extraction catalytic oxidation desulfurization catalyst; The heat treatment method is water bath heating, and the heat treatment temperature is 50~75℃.

2. The light according to claim 1 The thermal extraction catalytic oxidation desulfurization catalyst is characterized by, The NH2 MIL 125(Ti) and g The mass ratio of C3N4 is 0.1 to 1:

1.

3. The light according to any one of claims 1 to 2 A method for preparing a thermal extraction catalytic oxidation desulfurization catalyst, characterized in that, Includes the following steps: [Mo6O] 19 ](NC 18 H 36 2. NH2 MIL 125(Ti) and g C3N4 was mixed in an organic solvent and then subjected to ultrasonic and heat treatments in sequence to obtain Mo6 / NH2. MIL 125(Ti) / g C3N4 is the light mentioned above. Thermal extraction catalytic oxidation desulfurization catalyst; The heat treatment method is water bath heating, and the heat treatment temperature is 50~75℃.

4. The preparation method according to claim 3, characterized in that, The organic solvent includes isopropanol.

5. The preparation method according to claim 3, characterized in that, The frequency of the ultrasound is 70~90Hz, and the duration is 20~45min.

6. The light according to any one of claims 1 to 2 The thermal extraction catalytic oxidation desulfurization catalyst or the light obtained by the preparation method according to any one of claims 3 to 5 Application of thermal extraction catalytic oxidation desulfurization catalyst in desulfurization of sulfur-containing fuels.

7. The application according to claim 6, characterized in that, The method for desulfurizing sulfur-containing fuel includes the following steps: Sulfur-containing fuel, catalyst, extractant and oxidant are mixed and subjected to an oxidation reaction under light conditions to achieve desulfurization; The catalyst is the photocatalyst according to any one of claims 1 to 2. The thermal extraction catalytic oxidation desulfurization catalyst or the light obtained by the preparation method according to any one of claims 3 to 5 Thermal extraction catalytic oxidation desulfurization catalyst.

8. The application according to claim 7, characterized in that, The sulfur-containing fuel includes vehicle fuel, and the ratio of the sulfur-containing fuel to the catalyst is 15 mL: 0.01~0.03 g; The extractant contains 1 Butyl 3 Methylimidazolium hexafluorophosphate, wherein the volume ratio of the sulfur-containing fuel to the extractant is 5-15:1; The oxidant contains H2O2, and the volume ratio of the sulfur-containing fuel to the oxidant is 15:0.072~0.

096.

9. The application according to claim 7, characterized in that, The light source is a 300W xenon lamp, and the oxidation reaction temperature is 50~70℃, with a time of 60~120min.

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