Composite purifying agent as well as preparation method and application thereof

Abstract

The invention discloses a composite purifying agent as well as a preparation method and application thereof, and relates to the technical field of fuel oil refining and adsorption separation. According to the purifying agent, an amorphous high-entropy alloy with three-dimensional communicated macropores serves as a framework, an all-silicon zeolite coating with 2-30 nm gradient mesopores grows on the surface of the amorphous high-entropy alloy in situ through a gas-phase silane permeation and microwave pulse flash crystallization technology, and a bicontinuous intercommunication network structure is formed. The element composition of the amorphous high-entropy alloy framework comprises at least one of Zr, Ti, Cu, Ni and Co; the mesoporous aperture of the zeolite coating is in gradient distribution. The composite purifying agent has excellent diesel oil decolorization performance, can decolorize degraded diesel oil with the initial chroma close to 400 to 100 or below according to the GB / T 3143 test standard, and the performance attenuation is lower than 5% after the composite purifying agent is recycled for 10 times, so that the technical problems of low decolorization efficiency and poor stability of a traditional adsorbent are solved.

Description

Technical Field

[0001] This invention relates to the field of fuel oil refining and adsorption separation technology, and more specifically, to a composite purifying agent, its preparation method, and its application. Background Technology

[0002] Diesel fuel, as an important petroleum refining product, undergoes complex oxidation and polymerization reactions during storage, transportation, and use, generating colored substances such as gums, asphaltenes, and polycyclic aromatic hydrocarbons, leading to a significant increase in diesel fuel color. According to GB / T3143-1982 "Determination of Color of Liquid Chemical Products (Platinum-Cobalt Color Number)" standard, the color of fresh diesel fuel is typically less than 100, but deteriorated diesel fuel or catalytic diesel fuel that has undergone long-term storage or improper treatment can reach or exceed 400 in color, severely affecting product quality and performance.

[0003] Industrially, hydrorefining and adsorption refining are the main methods for decolorization. Hydrorefining requires significant investment and stringent conditions; while adsorption refining has simpler equipment, traditional adsorbent materials each have their shortcomings: activated clay has limited decolorization depth for high-color diesel; molecular sieves are limited by pore size and have poor removal efficiency for large-molecule pigments; activated carbon is costly and difficult to regenerate; silica gel is prone to pulverization and has limited capacity. Existing modified adsorbent technologies also struggle to decolorize high-color diesel to a low-color level, failing to meet the requirements for high-quality oil products.

[0004] Traditional metal-based purifiers face common challenges such as the contradiction between activity and stability, poor selectivity, and limited active sites due to their crystal structure. Metallic glasses (amorphous alloys), due to their amorphous structure and surface properties, show potential in catalysis and may have a strong adsorption capacity for various pigment molecules. However, their application in diesel decolorization is less studied, mainly due to their low specific surface area and difficulty in controlling surface properties. Meanwhile, the pore size limitations of traditional materials such as zeolites and the uncontrollable structure after mesoporization also restrict the effective removal of large molecular pigments.

[0005] Therefore, there is an urgent need to develop a new type of composite purification material that can achieve deep decolorization, has high adsorption capacity, good selectivity and stability, and to develop a simple and efficient preparation method to overcome the current technical bottlenecks.

[0006] In view of this, the present invention is proposed. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a composite purifying agent, its preparation method, and its application. Through innovative structural design of the composite purifying agent, high-color diesel oil can be deeply decolorized.

[0008] Another objective of this invention is to provide a method for preparing the composite purifying agent, which should have the characteristics of simple process, low energy consumption, and environmental friendliness.

[0009] Another object of the present invention is to provide the application of the composite purifying agent in diesel decolorization, particularly in the application of deep decolorizing high-color diesel to below 100.

[0010] This invention is implemented as follows: In the first aspect, the present invention constructs a composite purifier with a unique "dual continuous interconnected network structure" through careful material selection and structural design. It includes an amorphous high-entropy alloy skeleton with three-dimensional interconnected macropores, a gradient mesoporous all-silica zeolite coating grown in situ on the surface of the skeleton, and an interfacial diffusion layer between the alloy skeleton and the gradient mesoporous all-silica zeolite coating.

[0011] Secondly, the present invention provides a method for preparing a composite purifying agent, comprising the following steps: melting metal raw materials weighed according to atomic ratio into a master alloy ingot under argon protection; remelting the master alloy ingot and obtaining an amorphous high-entropy alloy skeleton with three-dimensional interconnected macropores by melt rapid quenching; forming a uniform oxide layer with a thickness of 5-10 nm on the surface of the alloy skeleton by surface oxidation activation treatment; subjecting the surface-activated alloy skeleton to precursor infiltration treatment in a mixed gas containing silane vapor and ammonium fluoride; and finally subjecting the alloy skeleton after infiltration treatment to pulsed microwave treatment to obtain the composite purifying agent.

[0012] Thirdly, the present invention provides an application of a composite purifying agent in diesel decolorization.

[0013] The present invention has the following beneficial effects: (1) The composite purifier described in this invention has excellent decolorization performance, fast decolorization speed, and large adsorption capacity for polycyclic aromatic hydrocarbons.

[0014] (2) The purifier described in this invention has excellent structural stability. After 10 adsorption-regeneration cycles, the decolorization performance retention rate is ≥95%, and the active components do not significantly fall off under the action of fluid shear force.

[0015] (3) The purifying agent described in this invention has wide environmental adaptability and can still maintain good decolorization performance under the condition of sulfur content ≤2000ppm. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0017] The following provides a detailed description of a composite purifying agent, its preparation method, and its application.

[0018] In a first aspect, the present invention provides a composite purifier that, through careful material selection and structural design, constructs a composite purifier with a unique “dual continuous interconnected network structure”, comprising a three-dimensional interconnected macroporous amorphous high-entropy alloy skeleton, a gradient mesoporous all-silica zeolite coating grown in situ on the skeleton surface, and an interfacial diffusion layer between the alloy skeleton and the gradient mesoporous all-silica zeolite coating.

[0019] In an optional embodiment, the elemental composition of the amorphous high-entropy alloy skeleton includes at least one of Zr, Ti, Cu, Ni, and Co, preferably five elements: Zr, Ti, Cu, Ni, and Co, with the atomic percentage of each element being Zr:Ti:Cu:Ni:Co=(0-25):(0-25):(0-25):(0-25):(0-25), and more preferably Zr:Ti:Cu:Ni:Co=20:20:20:20:20; its Vickers hardness is ≥500HV, and its thermal stability temperature is ≥500℃, ensuring long-term stability under operating conditions; the amorphousness of the obtained amorphous high-entropy alloy skeleton is ≥95%, and the pore size distribution deviation is ±0.5μm.

[0020] In this design, the amorphous high-entropy alloy framework serves as the supporting framework and catalytic active center for the composite purifier. Zr and Ti readily form amorphous structures, and the oxides / hydroxides enriched on their surfaces can strongly interact with heteroatoms (N, S, O) in the pigment molecules. Cu and Ni provide excellent catalytic activity, potentially catalyzing the degradation of pigment molecules by activating dissolved oxygen. Co modulates the electronic structure, further enhancing catalytic activity and stability. This multi-principal element design, through high-entropy and lattice distortion effects, endows the alloy with a unique electronic structure and abundant active sites.

[0021] In an optional embodiment, the skeleton has a precisely regulated three-dimensional interconnected macroporous structure with a pore size range of 0.5-5 μm and a porosity of 60-80%, providing a rapid channel for the transport of macromolecular pigments in diesel fuel and effectively avoiding the problem of easy clogging of traditional microporous materials.

[0022] In an optional embodiment, the specific surface area of ​​the gradient mesoporous all-silica zeolite coating is 400-600 m². 2 / g, pore volume 0.8-1.2cm 3 / g, and its surface silicon-to-aluminum ratio ≥1000.

[0023] In this application, the gradient mesoporous all-silica zeolite coating serves as a selective adsorption layer and molecular sieving unit. It employs an all-silica zeolite material with a high silica-to-alumina ratio (S / A ratio) of ≥1000, ensuring both hydrophobicity and affinity for organic pigment molecules. The coating's specific surface area reaches 300-600 m² / s. 2 / g, pore volume 0.8-1.5cm 3 / g ensures both sufficient adsorption capacity and good mass transfer performance.

[0024] In an optional embodiment, the thickness of the gradient mesoporous all-silica zeolite coating is 50-200 nm, and it has a unique gradient mesoporous structure. From the inner layer to the outer layer, the pore size gradually increases from 2-5 nm to 20-30 nm, forming a continuous pore size gradient distribution.

[0025] This gradient mesoporous structure design enables hierarchical capture of pigment molecules of different sizes: the outer layer of larger mesopores (20-30 nm) first captures larger molecules of colloids and asphaltenes, while the inner layer of smaller mesopores (2-5 nm) is responsible for adsorbing smaller molecules of polycyclic aromatic hydrocarbons.

[0026] In this application, a special preparation process is used to form an interfacial diffusion layer with a thickness of 10-50 nm between the amorphous high-entropy alloy skeleton and the gradient mesoporous zeolite coating. The presence of the interfacial transition layer not only enhances the mechanical strength of the material, but also promotes electron transfer between the alloy skeleton and the zeolite coating, thereby enhancing the synergistic catalytic effect.

[0027] In an optional embodiment, the atomic concentrations of Zr and Ti elements in the interfacial diffusion layer decrease in a gradient from the alloy side to the zeolite side, with a decreasing gradient of 5-10 at% / nm. This achieves a strong bond between the two elements at the atomic scale, effectively solving the common interfacial separation problem in traditional composite materials.

[0028] Secondly, the present invention provides a method for preparing a composite purifying agent, the method comprising the following steps: S1. Preparation of porous amorphous high-entropy alloy framework: The metal raw materials weighed according to the atomic ratio are melted into a master alloy ingot under argon protection; after the master alloy ingot is remelted, an amorphous high-entropy alloy framework with three-dimensional interconnected macropores is obtained by melt rapid quenching method.

[0029] In an optional embodiment, the remelting temperature of the master alloy ingot is 200-300°C with a superheat, and the cooling rate of the melt rapid quenching method is ≥10. 6 K / s.

[0030] In this application, a rapid cooling and solidification technique is employed to melt high-purity metal raw materials weighed according to a specific atomic ratio into a homogeneous master alloy ingot under argon protection. By precisely controlling the melt temperature (superheat 200-300℃) and cooling rate (≥106K / s), an amorphous high-entropy alloy framework with a three-dimensional interconnected macroporous structure is prepared, ensuring its amorphism ≥95% and pore size distribution deviation controlled within ±0.5μm.

[0031] S2. Surface oxidation activation treatment: After the alloy skeleton is subjected to surface oxidation activation treatment, a uniform oxide layer with a thickness of 5-10nm is formed on its surface.

[0032] In an optional embodiment, the framework is heat-treated at 400°C for 30 minutes in an inert mixed atmosphere with an oxygen concentration of 1-5% vol to form a uniform oxide layer with a thickness of 5-10 nm on its surface. This oxide layer serves as the basis for subsequent gas-phase reactions, providing not only reactive sites but also ensuring the uniform adsorption and reaction of the silane precursor.

[0033] S3. Precursor infiltration: The surface-activated alloy skeleton is placed in a special reactor and a mixture of argon gas containing silane vapor and ammonium fluoride is introduced to carry out precursor infiltration treatment.

[0034] In an optional embodiment, the silane vapor content in the mixed gas is 5-10 vol%, and the ammonium fluoride content is 1-3 vol%; the precursor permeation treatment is carried out at 295-305℃ and 0.1-0.5 MPa pressure for 2 hours, with the gas flow rate controlled at 50-100 mL / min.

[0035] Through gas-phase precursor permeation treatment, the precursor is uniformly permeated into all the pores of the skeleton through the gas phase and adsorbed on the surface of the pores.

[0036] S4. Microwave pulse flash crystallization: Finally, the alloy skeleton after the infiltration treatment is subjected to pulse microwave treatment to obtain the composite purifier.

[0037] In an optional embodiment, the pulsed microwave processing power is 800-1200W, the frequency is 2.45GHz, the pulse interval is 0.8-1.2s, and the processing time is 5-15 minutes.

[0038] In this invention, a specially designed microwave reactor is used. The unique heating mechanism of microwaves enables rapid and uniform crystallization of the precursor, while promoting the formation of the interfacial diffusion layer. Compared with the traditional hydrothermal method, which takes several days, the pulsed microwave treatment process is greatly shortened, significantly improving production efficiency.

[0039] Thirdly, the present invention provides an application of a composite purifying agent in diesel decolorization, preferably in the refining and adsorption separation process of fuel oil, or in the deep refining of high-color diesel products in refineries, the regeneration treatment of deteriorated diesel during storage and transportation, and other deep decolorization processes of fuel oil products that require deep decolorization.

[0040] The decolorization method used in this application is simple: the composite purifying agent is mixed with the diesel oil to be treated at a mass-volume ratio of 1g:50ml, and the mixture is treated at a temperature of 60℃ and a stirring speed of 200rpm for 40 minutes to achieve deep decolorization.

[0041] In some preferred embodiments, the composite purifying agent, according to the GB / T 3143 test standard, can decolorize deteriorated diesel fuel with an initial color of 380-420 to below 100.

[0042] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0043] Example 1 This embodiment provides a composite purifying agent, which is prepared according to the following steps: Accurately weigh 20g each of high-purity zirconium, titanium, copper, nickel, and cobalt, and melt them into a master alloy ingot under argon protection. Take 10g of the master alloy ingot and remelt it at a superheat of 250℃ to obtain an amorphous high-entropy alloy skeleton by melt rapid quenching. Heat-treat the alloy skeleton in air at 400℃ for 30 minutes to activate its surface oxidation. Then, place the activated skeleton in a reactor and introduce a mixture of argon gas containing 8vol% silane and 2vol% ammonium fluoride (flow rate 80mL / min), and maintain it at 300℃ and 0.2MPa pressure for 2 hours. Finally, pulse treatment is performed at 1000W microwave power for 10 minutes to obtain the composite purifying agent.

[0044] The amorphous high-entropy alloy skeleton prepared in Example 1 has a pore size distribution of 1-3 μm and a porosity of 70%.

[0045] Example 2 This embodiment provides a composite purifier. The preparation steps of the composite purifier are the same as those in Embodiment 1, except that the pore size of the amorphous high-entropy alloy skeleton is controlled to be 0.5-2μm and the porosity is 65%.

[0046] Example 3 This embodiment provides a composite purifier. The preparation steps of the composite purifier are the same as those in Embodiment 1, except that the pore size of the amorphous high-entropy alloy skeleton is controlled to be 3-5 μm and the porosity is 75%.

[0047] Example 4 This embodiment provides a composite purifying agent. The preparation steps of the composite purifying agent are the same as those in Embodiment 1, except that the concentration of silane in the gas phase precursor permeation step is 5 vol and the concentration of ammonium fluoride is 1 vol.

[0048] Example 5 This embodiment provides a composite purifying agent. The preparation steps of the composite purifying agent are the same as those in Embodiment 1, except that the concentration of silane in the gas phase precursor permeation step is 10 vol and the concentration of ammonium fluoride is 3 vol.

[0049] Example 6 This embodiment provides a composite purifying agent. The preparation steps of the composite purifying agent are the same as those in Embodiment 1, except that the microwave pulse treatment time is 5 minutes.

[0050] Example 7 This embodiment provides a composite purifying agent. The preparation steps of the composite purifying agent are the same as those in Embodiment 1, except that the microwave pulse treatment time is 15 minutes.

[0051] Example 8 This embodiment provides a composite purifying agent. The preparation steps of the composite purifying agent are the same as those in Embodiment 1, except that the amorphous high-entropy alloy composition is Zr. 25 Ti 25 Cu 25 Ni 25 (at%), does not contain Co.

[0052] Comparative Example 1 This comparative example provides a purifying agent, using commercially available activated clay with a specific surface area of ​​250 m². 2 / g, pore volume 0.4cm 3 / g.

[0053] Comparative Example 2 This comparative example provides a purifying agent, using commercially available 13X molecular sieve with a specific surface area of ​​550 m². 2 / g, pore size 0.8nm.

[0054] Comparative Example 3 This comparative example provides a purifying agent, using common Zr. 50 Cu 50 Amorphous alloy powder, prepared by gas atomization, with a particle size of 50-100μm.

[0055] Comparative Example 4 This comparative example provides a purifying agent, which uses a traditional impregnation method to prepare Cu / 13X molecular sieve. The preparation steps are as follows: the 13X molecular sieve is impregnated in a 0.5 mol / L copper nitrate solution for 4 hours, dried at 120°C for 12 hours, and then calcined in air at 500°C for 3 hours with a Cu loading of 5 wt%.

[0056] Comparative Example 5 This comparative example provides a composite purifier, which is prepared by the sol-gel method to prepare a SiO2-Al2O3 composite carrier. The preparation steps are as follows: using tetraethyl orthosilicate and aluminum isopropoxide as precursors, hydrolyzing and condensing them under pH=3 conditions, and calcining at 500℃ for 4 hours.

[0057] Comparative Example 6 This comparative example provides a composite purifying agent, which is prepared by mechanical mixing of amorphous alloy powder and activated clay. The preparation steps are as follows: the amorphous alloy powder obtained in Example 3 and the activated clay of Comparative Example 1 are mixed in a ball mill at a mass ratio of 1:1 for 2 hours.

[0058] Comparative Example 7 This comparative example provides a composite purifier, which uses a traditional coating method to coat the surface of an amorphous high-entropy alloy skeleton with SiO2. The preparation steps are as follows: the skeleton obtained in Example 1 is immersed in silica sol, coated by dip coating, and then heat-treated at 500°C for 2 hours.

[0059] Comparative Example 8 This comparative example provides a composite purifier, which uses chemical deposition to deposit TiO2 on the surface of an amorphous high-entropy alloy skeleton. The preparation steps are as follows: the skeleton obtained in Example 1 is placed in an ethanol solution of tetrabutyl titanate and treated at 400°C for 2 hours by chemical vapor deposition.

[0060] Experimental Example 1 The composite purifying agents described in Examples 1-8 and Comparative Examples 1-8 were subjected to the following tests: The pore structure was characterized by nitrogen adsorption-desorption testing (Micromeritics ASAP 2020) to analyze the specific surface area and pore structure of the material.

[0061] Decolorization performance test: Take 2.0g of the purifying agent sample prepared in each example and comparative example, mix it with 100mL of degraded diesel oil with an initial color of 400±20 (tested according to GB / T 3143 standard), stir for 40 minutes at 60℃ and 200rpm, filter, and then determine the color of the decolorized diesel oil according to GB / T 3143 standard.

[0062] Cyclic stability test: The used purifier was regenerated by calcining it in air at 400°C for 2 hours to examine its recyclability. Each cycle included the entire adsorption-regeneration process, and a total of 10 cycles were performed.

[0063] Sulfur resistance test: High-sulfur diesel oil with a sulfur content of 2000 ppm (adjusted by adding dibenzothiophene) was prepared, and the decolorization performance of each sample under harsh conditions was examined. The test results are shown in Tables 1 and 2.

[0064] Table 1. Decolorization performance test results of each sample (in accordance with GB / T 3143 standard)

[0065] Table 2. Test results of sulfur resistance of each sample

[0066] The test results show that the composite purifying agent prepared by this invention (Examples 1-8) is significantly superior to the comparative samples in terms of decolorization performance, cycle stability, and sulfur resistance. According to the GB / T 3143 test standard, all the sample examples were able to decolorize the deteriorated diesel fuel with an initial color of around 400 to below 100. Among them, Examples 1, 5, and 7 achieved a color of below 85 after decolorization, which is far superior to the comparative samples (color of 125-325 after decolorization).

[0067] Regarding cycle stability, after 10 regeneration cycles, the color of the example sample remained below 118 after decolorization, while the performance of the comparative sample deteriorated significantly (the color reached 215-325 after 10 cycles). This indicates that the strong bonding achieved by the interfacial diffusion layer in this invention effectively prevents the shedding of active components and ensures stability during long-term use.

[0068] Regarding sulfur resistance, the example samples maintained good decolorization performance under high sulfur conditions (2000 ppm), with the color remaining below 128 after decolorization and a performance degradation rate of less than 20%, while the performance degradation rate of the comparative samples generally exceeded 25%. This indicates that the unique electronic structure of amorphous high-entropy alloys gives them good tolerance to sulfides.

[0069] Comparing the examples, Example 7 (microwave treatment for 15 minutes) exhibits the best overall performance, indicating that an appropriate crystallization time is beneficial for forming a more complete gradient mesoporous structure. Examples 5 (high-concentration precursor) and Example 1 (standard conditions) also show excellent performance, demonstrating that the process of the present invention has good tolerance. Example 8 (Co-free) has slightly inferior performance, proving that the pentagonal high-entropy design has a synergistic enhancement effect.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A composite purifying agent, characterized in that, It includes a three-dimensional interconnected macroporous amorphous high-entropy alloy framework, a gradient mesoporous all-silica zeolite coating grown in situ on the surface of the framework, and an interfacial diffusion layer between the alloy framework and the gradient mesoporous all-silica zeolite coating. The amorphous high-entropy alloy framework has a pore size of 0.5-5 μm and a porosity of 60-80%. The thickness of the gradient mesoporous all-silica zeolite coating is 50-200 nm, and its mesopore size is gradient-distributed, with the inner layer pore size being 2-5 nm and the outer layer pore size being 20-30 nm.

2. The composite purifying agent according to claim 1, characterized in that, The elemental composition of the amorphous high-entropy alloy framework includes at least one of Zr, Ti, Cu, Ni and Co, with each element having an atomic percentage of Zr:Ti:Cu:Ni:Co=(0-25):(0-25):(0-25):(0-25):(0-25), a Vickers hardness ≥500HV, and a thermal stability temperature ≥500℃. The amorphousness of the resulting amorphous high-entropy alloy framework is ≥95%, and the pore size distribution deviation is ±0.5μm.

3. The composite purifying agent according to claim 1, characterized in that, The specific surface area of ​​the gradient mesoporous all-silica zeolite coating is 400-600 m². 2 / g, pore volume 0.8-1.2cm 3 / g, and its surface silicon-to-aluminum ratio is ≥1000.

4. The composite purifying agent according to claim 1, characterized in that, The thickness of the interface diffusion layer is 10-50 nm, and the atomic concentrations of Zr and Ti elements in the interface diffusion layer decrease in a gradient from the alloy side to the zeolite side, with a decreasing gradient of 5-10 at% / nm.

5. A method for preparing the composite purifying agent as described in any one of claims 1-4, characterized in that, The process includes the following steps: metal raw materials weighed according to atomic ratio are melted into a master alloy ingot under argon protection; the master alloy ingot is remelted and then subjected to melt rapid quenching to obtain an amorphous high-entropy alloy framework with three-dimensional interconnected macropores; the alloy framework is subjected to surface oxidation activation treatment to form a uniform oxide layer with a thickness of 5-10 nm on its surface; the surface-activated alloy framework is subjected to precursor infiltration treatment in a mixed gas containing silane vapor and ammonium fluoride; finally, the alloy framework after infiltration treatment is subjected to pulsed microwave treatment to obtain the composite purifying agent.

6. The method for preparing a composite purifying agent according to claim 5, characterized in that, The remelting temperature of the master alloy ingot is 200-300℃ with a superheat, and the cooling rate of the melt rapid quenching method is ≥10. 6 K / s.

7. The method for preparing a composite purifying agent according to claim 5, characterized in that, The surface oxidation activation treatment includes heat-treating the alloy skeleton at 400°C for 30 minutes in an inert mixed atmosphere with an oxygen concentration of 1-5% vol.

8. The method for preparing a composite purifying agent according to claim 5, characterized in that, The mixed gas contains 5-10 vol% silane vapor and 1-3 vol% ammonium fluoride; the precursor permeation treatment is carried out at 295-305℃ and 0.1-0.5 MPa pressure for 2 hours, with the gas flow rate controlled at 50-100 mL / min.

9. The method for preparing a composite purifying agent according to claim 5, characterized in that, The pulsed microwave processing has a power of 800-1200W, a frequency of 2.45GHz, a pulse interval of 0.8-1.2s, and a processing time of 5-15 minutes.

10. The application of a composite purifying agent as described in any one of claims 1-4 in diesel decolorization.

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