Method for preparing biological aviation oil precursor by driving lignocellulose through thermophotoelectric concerted catalysis

Abstract

The invention discloses a method for preparing a biological aviation oil precursor by driving lignocellulose through thermophotoelectric concerted catalysis, and the method comprises the following steps: electrifying a first reaction system of an anode under illumination and heating, the first reaction system being formed by lignocellulose dispersion liquid, an anode catalyst and anolyte; the platform chemicals generated by the first reaction system are diffused to the cathode to form a second reaction system with the cathode catalyst and the cathode electrolyte; the second reaction system is illuminated to obtain the biological aviation oil precursor. By utilizing the synergistic effect of multiple energy fields of heat, light and electricity, the limitation of single catalysis is broken through, selective depolymerization and carbon chain reconstruction of the lignocellulose under normal pressure are realized, efficient directional conversion of the lignocellulose is realized, and a new scheme is provided for green preparation of the biological aviation oil.

Description

Technical Field

[0001] The invention relates to the technical field of photocatalytic preparation of bio-aviation fuel, and in particular to a method for preparing a bio-aviation fuel precursor by driving lignocellulose through thermophotoelectric synergistic catalysis. Background Art

[0002] Lignin is a type of biomass that is a renewable organic carbon source with abundant reserves. Using cellulose as a raw material to obtain renewable bio-jet fuel precursors has great prospects. However, the stubborn chemical bonds of cellulose (such as lignin β-O-4 ether bonds) result in traditional thermochemical conversions requiring high temperatures (>300°C), high pressures, and multi-stage reactions, which have high energy consumption and poor product selectivity. At the same time, it relies on precious metal catalysts and high-pressure hydrogen, which poses a risk of flammability and explosion.

[0003] In addition, the synthesis of jet fuel precursors requires the conversion of small molecule platform compounds into C10-C18 long-chain hydrocarbons through carbon chain extension reactions (such as aldol condensation and hydrodeoxygenation). The current conversion methods also generally face challenges such as wide product distribution, low aromatic content, and insufficient catalyst stability. The development of mild, efficient, and safe lignocellulose conversion technology has become the focus of the global green energy field.

[0004] Heterojunction photocatalysis has shown good application prospects for the synthesis of organic products. Photocatalysis is expected to achieve selective cleavage of lignocellulose bonds without the participation of high-pressure hydrogen and avoiding the corrosive and dangerous conditions of high-temperature thermochemical pathways. However, the selection of catalytic materials and specific reaction conditions have not been reported. Summary of the invention

[0005] The purpose of the present invention is to utilize the synergistic effect of heat, light and electricity to drive the selective breakage of lignocellulose bonds (such as β-O-4 ether bonds) and cathode reduction-mediated carbon chain reconstruction under normal pressure, generate C10-C18 long-chain alkane / aromatic precursors through carbon-carbon coupling reactions, and simultaneously complete the cracking-isomerization-cyclization reactions without the participation of high-pressure hydrogen, avoiding the corrosiveness and danger of high-temperature thermochemical pathways, significantly reducing energy consumption and operational risks, and providing a new paradigm for the efficient and green conversion of bio-jet fuel.

[0006] In order to achieve the above-mentioned object, the present invention provides a method for preparing bio-jet fuel precursor by driving lignocellulose by thermophotoelectric synergistic catalysis, comprising: Applying electricity to a first reaction system at the anode under light and heating, wherein the first reaction system is formed by a lignocellulose dispersion, an anode catalyst and an anode electrolyte; The platform chemical generated by the first reaction system diffuses to the cathode and forms a second reaction system with the cathode catalyst and the cathode electrolyte; The second reaction system obtains the bio-jet fuel precursor under light irradiation.

[0007] Furthermore, the intensity of the illumination is 100-300 mW / cm 2 ; The heating temperature is 80-140°C; The voltage of the power supply is 0.4-1.2V.

[0008] Furthermore, the anode catalyst is WO3 / BiVO4 loaded with precious metals; The cathode catalyst is TiO2 / g-C3N4 loaded with single-atom metal.

[0009] Specifically, WO3 / BiVO4 is prepared by referring to the preparation method of the document "Fabrication and Characterization of Heterostructure WO3 / BiVO4 / TiO2 Photocatalyst for Efficient Performance of Photoelectrochemical Water Splitting" without any modification. WO3 / BiVO4 loaded with precious metal is prepared by dispersing WO3 / BiVO4 in a precious metal precursor aqueous solution, adding methanol or ethanol as a sacrificial agent, and 2 After irradiating under strong light for 20-120 minutes, the insoluble matter is collected, and the insoluble matter is placed in an air atmosphere at 300-500° C. and calcined for 2-4 hours to obtain a precious metal loading of 0.2wt%-5wt%.

[0010] Specifically, TiO2 / g-C3N4 is prepared by referring to the preparation method of the literature "Defect-Regulated Two-Dimensional Superlattice of Holey g- C3N4-TiO2Nanohybrids: Contrasting Influence of Vacancy Content on Hybridization Impact and Photocatalyst Performance" without modification. The TiO2 / g-C3N4 loaded with single-atom metal is prepared by dispersing 0.1-3g of TiO2 / g-C3N4 in 100-300mL of a 1wt%-5wt% metal aqueous solution, adding methanol or ethanol as a sacrificial agent, and heating the TiO2 / g-C3N4 to 100-300mW / cm 2 After irradiating under strong light for 60-120 minutes, the insoluble matter is collected and dried.

[0011] Furthermore, the anode electrolyte is an alkaline solution containing 5wt%-10wt% ionic liquid and a pH of 9-14.

[0012] The addition of ionic liquid is to enhance the solubility of lignocellulose. The type of ionic liquid is not limited. For example, it can be at least one of [BMIM]OH, [C4mim]OH and [N2222]OH.

[0013] Furthermore, the cathode electrolyte is an acidic solution with a pH of 1-5.

[0014] Furthermore, the mass ratio of the lignocellulose dispersion, the anode catalyst and the anode electrolyte in the first reaction system is 1-5: 0.02-0.1: 20-30; The mass ratio of the anolyte to the cathode electrolyte is 1-3:2-4.

[0015] Further, the mass ratio of the cathode catalyst to the cathode electrolyte is 0.02-0.1:50-100; Furthermore, the anode and the cathode are separated by a filter membrane, and the molecular weight cutoff value of the filter membrane is 1-100 kDa.

[0016] Furthermore, the preparation method of the lignocellulose dispersion comprises: The raw material rich in lignin and cellulose is mechanically crushed to 80-200 meshes, then treated in a 1wt%-5wt% acid solution at 60-100°C for 1-3h, washed and dried to obtain a pretreated material; the pretreated material is mixed with water at a mass ratio of 1:1-3 to obtain a lignocellulose dispersion. The raw material rich in lignin and cellulose is not limited, and can be exemplarily leaves, straw, sawdust, peanut shells, etc.

[0017] The present invention also provides a bio-aviation fuel precursor, which is obtained by adopting the above method.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention selectively breaks the β-O-4 ether bond and CC bond through anodic oxidation to generate platform chemicals that diffuse to the cathode, and then drive the carbon-carbon coupling reaction under the action of the cathode catalyst to generate aromatic or linear hydrocarbon bio-jet fuel precursors. The present invention utilizes the synergistic effect of heat, light, and electricity multi-energy fields to break through the limitations of single catalysis, so that the selective depolymerization and carbon chain reconstruction of lignocellulose under normal pressure can be achieved, and the efficient and directional conversion of lignocellulose can be realized, providing a new solution for the green preparation of bio-jet fuel.

[0019] The present invention can not only avoid the high energy consumption and safety hazards of traditional high-temperature and high-pressure processes, but also directly utilize biomass-derived molecules (such as phenols and aldehydes) to construct a carbon skeleton that meets aviation fuel standards, greatly reducing dependence on fossil raw materials and external hydrogen.

[0020] This invention can promote the low-carbon transformation of the aviation industry, activate the resource utilization of agricultural and forestry wastes, help the coordinated development of the rural economy and the green industrial chain, and provide a new solution for the green preparation of bio-jet fuel, which has far-reaching strategic significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 The H-NMR spectrum of the platform compound prepared at the anode of Example 3 is shown; Figure 2 The H-NMR spectrum of the bio-jet fuel precursor prepared in Example 3 is shown; Figure 3 The H-NMR spectrum of the bio-jet fuel precursor prepared in Example 5 is shown; Figure 4 The C-NMR spectrum of the bio-jet fuel precursor prepared in Example 5 is shown. DETAILED DESCRIPTION

[0023] The endpoints and any values ​​of the ranges disclosed in the present invention 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 each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be regarded as specifically disclosed in the present invention.

[0024] The preparation method of WO3 / BiVO4 loaded with precious metals used in the embodiment is: WO3 / BiVO4 was dispersed in chloroplatinic acid aqueous solution, methanol was added as sacrificial agent, and the 2 After irradiation under strong light for 60 minutes, the insoluble matter was collected and calcined in air at 400°C for 3 hours to obtain Pt-loaded WO3 / BiVO4. By adjusting the concentration of chloroplatinic acid aqueous solution, WO3 / BiVO4 with a Pt loading of 0.2wt%-5wt% was prepared.

[0025] The preparation method of TiO2 / g-C3N4 loaded with single-atom metal used in the embodiment is: 3 g of TiO2 / g-C3N4 was dispersed in 300 mL of 3 wt% H2PdCl4 aqueous solution, and 30 mL of methanol was added as a sacrificial agent. 2 After irradiation for 80 min under strong light, the insoluble matter was collected and dried to obtain TiO2 / g-C3N4 loaded with single Pd atom. Under the same preparation method, TiO2 / g-C3N4 loaded with single Cu atom was prepared using copper nitrate aqueous solution of the same concentration.

[0026] The raw material rich in lignin and cellulose used in the examples is straw.

[0027] The above contents will not be repeated in the embodiments.

[0028] The following will be combined with the specific embodiments of the present invention and the drawings of the specification to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1 Step 1: 2 g of straw was mechanically crushed to 100 mesh, treated with 200 mL of 3 wt % sulfuric acid aqueous solution at 80° C. for 2 h, and then washed and dried to obtain a pretreated material; the pretreated material was mixed with water at a mass ratio of 1:2 to obtain a lignocellulose dispersion; Step 2: 2 g of lignocellulose dispersion, 0.1 g of Pt-loaded WO3 / BiVO4 (loading amount is 2 wt%), and 25 g of potassium hydroxide aqueous solution containing 5 wt% [BMIM]OH and pH 10 were mixed to obtain a first reaction system; Step 3: Use a cellulose membrane with a cutoff value of 50 kDa to separate the anode chamber and the cathode chamber of the electrolytic cell, and add the first reaction system into the anode chamber; add 25 g of a sulfuric acid aqueous solution with a pH of 3 and 0.1 g of TiO2 / g-C3N4 loaded with single-atom Pd into the cathode chamber; Step 4: Use an intensity of 200mW / cm 2 The anode chamber and cathode chamber were irradiated with light, the anode chamber was heated to 120°C and a voltage of 1V was applied, and the platform chemicals vanillin and acetone generated by the first reaction system diffused to the cathode through the cellulose membrane and underwent carbon-carbon coupling reaction under light for 6 hours to generate a bio-jet fuel precursor.

[0030] The prepared bio-jet fuel precursor was tested using high performance liquid chromatography, and the results showed that the proportion of C12-C16 long-chain alkanes (hereinafter referred to as selectivity) was as high as 85%.

[0031] Example 2 Step 1: 3 g of straw was mechanically crushed to 150 mesh, treated with 300 mL of 2 wt % sulfuric acid aqueous solution at 90° C. for 1.5 h, and then washed and dried to obtain a pretreated material; the pretreated material was mixed with water in a mass ratio of 1:1 to obtain a lignocellulose dispersion.

[0032] Step 2: 2 g of lignocellulose dispersion, 0.1 g of Pt-loaded WO3 / BiVO4 (loading amount is 1 wt%), and 25 g of potassium hydroxide aqueous solution containing 5 wt% [C4mim]OH and pH 12 were mixed to obtain a first reaction system; Step 3: Use a cellulose membrane with a cutoff value of 50 kDa to separate the anode chamber and the cathode chamber of the electrolytic cell, and add the first reaction system into the anode chamber; add 50 g of a phosphoric acid aqueous solution with a pH of 2 and 0.1 g of TiO2 / g-C3N4 loaded with single-atom Cu into the cathode chamber; Step 4: Use intensity of 150mW / cm 2 The anode chamber and cathode chamber were irradiated with light, the anode chamber was heated to 100°C and a voltage of 1V was applied. The platform chemicals syringaldehyde and 3-pentanone generated by the first reaction system diffused to the cathode through the cellulose membrane and underwent carbon-carbon coupling reaction under light for 8 hours to generate a bio-jet fuel precursor.

[0033] The prepared bio-jet fuel precursor was tested using high performance liquid chromatography, and the results showed that the selectivity of C10-C14 long-chain alkanes was as high as 88%.

[0034] Example 3 Step 1: 1.5 g of straw was mechanically crushed to 200 mesh, treated with 150 mL of 4 wt % sulfuric acid aqueous solution at 70° C. for 2.5 h, and then washed and dried to obtain a pretreated material; the pretreated material was mixed with water at a mass ratio of 1:3 to obtain a lignocellulose dispersion; Step 2: 2 g of lignocellulose dispersion, 0.1 g of Pt-loaded WO3 / BiVO4 (loading amount is 3 wt%), and 30 g of potassium hydroxide aqueous solution containing 7 wt% [N2222]OH and pH 9 were mixed to obtain a first reaction system; Step 3: Use a cellulose membrane with a cutoff value of 50 kDa to separate the anode chamber and the cathode chamber of the electrolytic cell, and add the first reaction system into the anode chamber; add 60 g of a sulfuric acid aqueous solution with a pH of 4 and 0.1 g of TiO2 / g-C3N4 loaded with single-atom Pd into the cathode chamber; Step 4: Use an intensity of 250mW / cm 2 The anode chamber and cathode chamber were irradiated with light, the anode chamber was heated to 140°C and a voltage of 1V was applied, the platform chemicals 5-hydroxymethylfurfural and 2,5-hexanedione generated by the first reaction system diffused to the cathode through the cellulose membrane, and underwent carbon-carbon coupling reaction under light for 4 hours to generate a bio-jet fuel precursor.

[0035] The prepared bio-jet fuel precursor was tested using high performance liquid chromatography, and the results showed that the selectivity of C12-C14 long-chain alkanes was as high as 90%.

[0036] Figure 1 The H-NMR spectrum of the platform compound prepared at the anode of this embodiment is shown; Figure 2 The H-NMR graph of the bio-jet fuel precursor prepared in this example is shown. It further verifies that under the thermophotoelectric effect of the anode, lignocellulose is successfully converted into 5-hydroxymethylfurfural and 2,5-hexanedione. Combined with the H-NMR analysis results of the product, it shows that under the photoreduction reaction of the cathode, 5-hydroxymethylfurfural and 2,5-hexanedione are successfully coupled to prepare the C13 long carbon chain bio-jet fuel precursor.

[0037] Example 4 Step 1: 4 g of straw was mechanically crushed to 80 mesh, treated with 400 mL of 5 wt % sulfuric acid aqueous solution at 100 ° C for 1 h, and then washed and dried to obtain a pretreated material; the pretreated material was mixed with water in a mass ratio of 1:2 to obtain a lignocellulose dispersion; Step 2: 2 g of lignocellulose dispersion, 0.1 g of Pt-loaded WO3 / BiVO4 (loading amount is 0.5 wt%), and 25 g of potassium hydroxide aqueous solution containing 10 wt% [BMIM]OH and pH 14 were mixed to obtain a first reaction system; Step 3: Use a cellulose membrane with a cutoff value of 50 kDa to separate the anode chamber and the cathode chamber of the electrolytic cell, and add the first reaction system into the anode chamber; add 25 g of sulfuric acid aqueous solution with a pH of 1 and 0.1 g of TiO2 / g-C3N4 loaded with single-atom Cu into the cathode chamber; Step 4: Use intensity of 100mW / cm 2 The anode chamber and cathode chamber were irradiated with light, the anode chamber was heated to 80°C and a voltage of 1V was applied, the platform chemicals 5-hydroxymethylfurfural and 2,5-furandicarboxaldehyde generated by the first reaction system diffused to the cathode through the cellulose membrane, and underwent carbon-carbon coupling reaction under light for 10 hours to generate a bio-jet fuel precursor.

[0038] The prepared bio-jet fuel precursor was tested using high performance liquid chromatography, and the results showed that the selectivity of C10-C12 long-chain alkanes was as high as 82%.

[0039] Example 5 Step 1: 2.5 g of straw was mechanically crushed to 120 mesh, treated with 250 mL of 1 wt% sulfuric acid aqueous solution at 60° C. for 3 h, and then washed and dried to obtain a pretreated material; the pretreated material was mixed with water at a mass ratio of 1:2 to obtain a lignocellulose dispersion; Step 2: 2 g of lignocellulose dispersion, 0.1 g of Pt-loaded WO3 / BiVO4 (loading amount is 4 wt%), and 30 g of potassium hydroxide aqueous solution containing 8 wt% [BMIM]OH and pH 9 were mixed to obtain a first reaction system; Step 3: Use a cellulose membrane with a cutoff value of 50 kDa to separate the anode chamber and the cathode chamber of the electrolytic cell, and add the first reaction system into the anode chamber; add 60 g of a phosphoric acid aqueous solution with a pH of 5 and 0.1 g of TiO2 / g-C3N4 loaded with single-atom Pd into the cathode chamber; Step 4: Use intensity of 300mW / cm 2 The anode chamber and cathode chamber were irradiated with light, and the anode chamber was heated to 130°C and a voltage of 1V was applied. The platform chemical vanillin generated by the first reaction system diffused to the cathode through the cellulose membrane and underwent carbon-carbon coupling reaction under light for 5 hours to generate a bio-jet fuel precursor.

[0040] The prepared bio-jet fuel precursor was tested using high performance liquid chromatography, and the results showed that the selectivity of C12-C16 long-chain alkanes was as high as 87%.

[0041] Figure 3 and Figure 4 The H-NMR spectrum and the C-NMR spectrum of the bio-jet fuel precursor prepared in this example are shown respectively.

[0042] Example 6 Step 1: 2.5 g of straw was mechanically crushed to 120 mesh, treated with 250 mL of 1 wt% sulfuric acid aqueous solution at 60° C. for 3 h, and then washed and dried to obtain a pretreated material; the pretreated material was mixed with water at a mass ratio of 1:2 to obtain a lignocellulose dispersion; Step 2: 2 g of lignocellulose dispersion, 0.1 g of Pt-loaded WO3 / BiVO4 (loading amount is 4 wt%), and 25 g of potassium hydroxide aqueous solution containing 7 wt% [C4mim]OH and pH 14 were mixed to obtain a first reaction system; Step 3: Use a cellulose membrane with a cutoff value of 50 kDa to separate the anode chamber and the cathode chamber of the electrolytic cell, and add the first reaction system into the anode chamber; add 50 g of a sulfuric acid aqueous solution with a pH of 1 and 0.1 g of TiO2 / g-C3N4 loaded with single-atom Pd into the cathode chamber; Step 4: Use intensity of 300mW / cm 2 The anode chamber and cathode chamber were irradiated with light, the anode chamber was heated to 130°C and a voltage of 1V was applied, and the platform chemicals vanillin and 2,5-furandicarboxaldehyde generated by the first reaction system diffused to the cathode through the cellulose membrane and underwent carbon-carbon coupling reaction under light for 5 hours to generate a bio-jet fuel precursor.

[0043] The prepared bio-jet fuel precursor was tested using high performance liquid chromatography, and the results showed that the selectivity of C12-C16 long-chain alkanes was as high as 87%.

[0044] Example 7 Step 1: 1 g of straw was mechanically crushed to 180 mesh, treated with 100 mL of 2.5 wt% sulfuric acid aqueous solution at 85° C. for 2 h, and then washed and dried to obtain a pretreated material; the pretreated material was mixed with water at a mass ratio of 1:2 to obtain a lignocellulose dispersion; Step 2: 2 g of lignocellulose dispersion, 0.1 g of WO3 / BiVO4 loaded with Pt (loading amount is 1.5 wt%), and 30 g of potassium hydroxide aqueous solution containing 6 wt% [C4mim]OH and pH 11 are mixed to obtain a first reaction system; Step 3: Use a cellulose membrane with a cutoff value of 50 kDa to separate the anode chamber and the cathode chamber of the electrolytic cell, and add the first reaction system into the anode chamber; add 90 g of a sulfuric acid aqueous solution with a pH of 2 and 0.1 g of TiO2 / g-C3N4 loaded with single-atom Cu into the cathode chamber; Step 4: Use intensity of 180mW / cm 2 The anode chamber and cathode chamber were irradiated with light, the anode chamber was heated to 110°C and a voltage of 1V was applied, and the platform chemicals furfural and phenylpropanone generated by the first reaction system diffused to the cathode through the cellulose membrane and underwent carbon-carbon coupling reaction under light for 7 hours to generate a bio-jet fuel precursor.

[0045] The prepared bio-jet fuel precursor was tested using high performance liquid chromatography, and the results showed that the selectivity of C10-C18 long-chain alkanes was as high as 89%.

[0046] Example 8 Step 1: 3.5 g of straw was mechanically crushed into 90 meshes, treated with 350 mL of 3.5 wt% sulfuric acid aqueous solution at 75° C. for 2 h, and then washed and dried to obtain a pretreated material; the pretreated material was mixed with water at a mass ratio of 1:2 to obtain a lignocellulose dispersion; Step 2: 2 g of lignocellulose dispersion, 0.1 g of WO3 / BiVO4 loaded with Pt (loading amount is 2.5 wt%), and 30 g of potassium hydroxide aqueous solution containing 10 wt% [N2222]OH and pH 13 are mixed to obtain a first reaction system; Step 3: Use a cellulose membrane with a cutoff value of 50 kDa to separate the anode chamber and the cathode chamber of the electrolytic cell, and add the first reaction system into the anode chamber; add 30 g of sulfuric acid aqueous solution with a pH of 1 and 0.1 g of TiO2 / g-C3N4 loaded with single-atom Pd into the cathode chamber; Step 4: Use an intensity of 220mW / cm 2 The anode chamber and cathode chamber were irradiated with light, the anode chamber was heated to 80°C and a voltage of 1V was applied, the platform chemicals 5-hydroxymethylfurfural and phenylpropanone generated by the first reaction system diffused to the cathode through the cellulose membrane, and underwent carbon-carbon coupling reaction under light for 9 hours to generate a bio-jet fuel precursor.

[0047] The prepared bio-jet fuel precursor was tested using high performance liquid chromatography, and the results showed that the selectivity of C12-C14 long-chain alkanes was as high as 86%.

[0048] Example 9 Step 1: 2 g of straw was mechanically crushed to 160 mesh, treated with 200 mL of 4.5 wt % sulfuric acid aqueous solution at 95° C. for 1.5 h, and then washed and dried to obtain a pretreated material; the pretreated material was mixed with water at a mass ratio of 1:2 to obtain a lignocellulose dispersion; Step 2: 2 g of lignocellulose dispersion, 0.1 g of Pt-loaded WO3 / BiVO4 (loading amount: 3.5 wt%), and 30 g of potassium hydroxide aqueous solution containing 10 wt% [BMIM]OH and pH 14 were mixed to obtain a first reaction system; Step 3: Use a cellulose membrane with a cutoff value of 50 kDa to separate the anode chamber and the cathode chamber of the electrolytic cell, and add the first reaction system into the anode chamber; add 60 g of a sulfuric acid aqueous solution with a pH of 4 and 0.1 g of TiO2 / g-C3N4 loaded with single-atom Cu into the cathode chamber; Step 4: Use intensity of 280mW / cm 2 The anode chamber and cathode chamber were irradiated with light, and the anode chamber was heated to 105°C and a voltage of 1V was applied. The platform chemicals vanillic aldehyde and phenylpropanone generated by the first reaction system diffused to the cathode through the cellulose membrane and underwent carbon-carbon coupling reaction under light for 10 hours to generate a bio-jet fuel precursor.

[0049] The prepared bio-jet fuel precursor was tested using high performance liquid chromatography, and the results showed that the selectivity of C10-C12 long-chain alkanes was as high as 91%.

[0050] Example 10 Step 1: 4.5 g of straw was mechanically crushed into 110 meshes, treated with 450 mL of 1.5 wt% sulfuric acid aqueous solution at 80° C. for 2 h, and then washed and dried to obtain a pretreated material; the pretreated material was mixed with water at a mass ratio of 1:2 to obtain a lignocellulose dispersion; Step 2: 2 g of lignocellulose dispersion, 0.1 g of Pt-loaded WO3 / BiVO4 (loading amount: 4.5 wt%), and 30 g of potassium hydroxide aqueous solution containing 7 wt% [BMIM]OH and pH 9 were mixed to obtain a first reaction system; Step 3: Use a cellulose membrane with a cutoff value of 50 kDa to separate the anode chamber and the cathode chamber of the electrolytic cell, and add the first reaction system into the anode chamber; add 60 g of a sulfuric acid aqueous solution with a pH of 5 and 0.1 g of TiO2 / g-C3N4 loaded with single-atom Cu into the cathode chamber; Step 4: Use an intensity of 240mW / cm 2 The anode chamber and cathode chamber were irradiated with light, the anode chamber was heated to 125°C and a voltage of 1V was applied, and the platform chemicals syringaldehyde and 2,5-furandicarboxaldehyde generated by the first reaction system diffused to the cathode through the cellulose membrane and underwent carbon-carbon coupling reaction under light for 4 hours to generate a bio-jet fuel precursor.

[0051] The prepared bio-jet fuel precursor was tested using high performance liquid chromatography, and the results showed that the selectivity of C12-C16 long-chain alkanes was as high as 88%.

[0052] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing bio-jet fuel precursor from lignocellulose by thermophotoelectric catalysis, characterized in that: include, Applying electricity to a first reaction system at the anode under light and heating, wherein the first reaction system is formed by a lignocellulose dispersion, an anode catalyst and an anode electrolyte; The platform chemical generated by the first reaction system diffuses to the cathode and forms a second reaction system with the cathode catalyst and the cathode electrolyte; The second reaction system obtains the bio-jet fuel precursor under light irradiation.

2. The method according to claim 1, characterized in that: The intensity of the light is 100-300 mW / cm 2 ; The heating temperature is 80-140°C; The voltage of the power supply is 0.4-1.2V.

3. The method according to claim 1, characterized in that The anode catalyst is WO3 / BiVO4 loaded with precious metals; The cathode catalyst is TiO2 / g-C3N4 loaded with single-atom metal.

4. The method according to claim 1, characterized in that The anode electrolyte is an alkaline solution containing 5wt%-10wt% ionic liquid and a pH of 9-14.

5. The method according to claim 1, characterized in that The cathode electrolyte is an acidic solution with a pH of 1-5.

6. The method according to claim 1, characterized in that The mass ratio of the lignocellulose dispersion, the anode catalyst and the anode electrolyte in the first reaction system is 1-5: 0.02-0.1: 20-30; The mass ratio of the anolyte to the cathode electrolyte is 1-3:2-4.

7. The method according to claim 1, characterized in that The mass ratio of the cathode catalyst to the cathode electrolyte is 0.02-0.1:50-100.

8. The method according to claim 1, characterized in that The anode and the cathode are separated by a filter membrane having a molecular weight cut-off value of 1-100 kDa.

9. The method according to any one of claims 1 to 8, characterized in that: The method for preparing the lignocellulose dispersion comprises: The raw material rich in lignin and cellulose is mechanically crushed to 80-200 meshes, and then treated in a 1wt%-5wt% acid solution at 60-100°C for 1-3h, and washed and dried to obtain a pretreated material; The pretreated material is mixed with water in a mass ratio of 1:1-3 to obtain a lignocellulose dispersion.

10. A bio-jet fuel precursor, characterized in that: The method is obtained by the method according to any one of claims 1 to 9.

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