Method and system for preparing sustainable aviation fuel through carbon dioxide hydrogenation

Abstract

The invention belongs to the technical field of chemical engineering and energy preparation, and particularly relates to a method and system for preparing sustainable aviation fuel through carbon dioxide hydrogenation. The method comprises the following steps: introducing carbon dioxide and hydrogen into a reactor filled with a catalyst, and reacting under the synergistic effect of microwaves and ultrasound to obtain the sustainable aviation fuel. Through the synergistic effect of microwave radiation and an ultrasonic field, high-efficiency hydrogenation conversion of CO2 is realized under mild reaction conditions (240-360 DEG C, 3-10 MPa), and the selectivity of a target product C8-C16 component exceeds 65 wt%. The reaction efficiency and the energy efficiency level are remarkably improved, the per-pass conversion rate of CO2 is larger than or equal to 60%, the energy consumption per unit product is lower than 25 MJ / ton, the service life of the catalyst exceeds 1000 h, and the catalyst can be regenerated many times. The method has the remarkable negative carbon property, meets the international sustainable aviation fuel standard, and provides a reliable and economical solution for low carbon in the aircraft industry.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of chemical industry and energy preparation, and particularly relates to a method and system for preparing sustainable aviation fuel by carbon dioxide hydrogenation. BACKGROUND

[0002] The rapid development of the aviation transportation industry has led to a continuous increase in carbon emissions. The annual consumption of aviation fuel is large, and the proportion of carbon emissions in the global transportation field is high. Therefore, the use of sustainable aviation fuel (SAF) needs to be improved. Sustainable aviation fuel (SAF) can be prepared by CO2 hydrogenation technology. The product needs to strictly meet the ASTM D7566 standard, and the content of paraffin needs to be between 40-70%, and the content of sulfur and nitrogen impurities needs to be less than 10 ppm.

[0003] At present, the technical route of CO2 hydrogenation for preparing sustainable aviation fuel mainly faces two core challenges. The first challenge lies in the catalyst and the reaction path. Although the existing Fischer-Tropsch synthesis route is relatively mature, the process energy consumption is high (35-40 MJ / ton), and the selectivity to the aviation kerosene target fraction (C8-C 16 ) is generally less than 70%. The more potential "one-step" direct synthesis route is limited by the difficulty in developing high-performance catalysts, and it is difficult to simultaneously achieve high-efficiency activation of CO2, precise control of carbon chain length (C8-C 16 ), and effective inhibition of side reactions. The second challenge, which is also a key bottleneck restricting industrialization and expansion, lies in the low mass transfer and heat transfer efficiency and energy utilization efficiency of the reactor system.

[0004] When traditional fixed bed or slurry bed reactors are used for CO2 hydrogenation process, the following inherent defects are generally present: (1) mass transfer limitation: the mass transfer resistance between gas-solid (or gas-liquid-solid) phases is large, and the reactants (CO2, H2) are difficult to efficiently diffuse to the catalyst active sites, and the products are also difficult to desorb in time, resulting in limited overall reaction rate. (2) Heat management problem: the reaction heat effect is significant, and the traditional external heating method has low efficiency, which easily forms local overheating (hot spots) in the catalyst bed. This not only accelerates the sintering and deactivation of the catalyst and the accumulation of carbon, but also causes cracking, excessive hydrogenation and other side reactions, reducing the selectivity of the target product. (3) Low energy utilization efficiency: the heating of the large reactor body causes a large amount of energy loss, and the activation energy required for the reaction can only be met by increasing the overall reaction temperature and pressure, resulting in high energy consumption in the preparation process.

[0005] Therefore, developing an integrated technical solution of "optimization of reaction method and matching system in coordination" is crucial for promoting the industrialization of the technology of preparing SAF from CO2 hydrogenation by strengthening the mass transfer and heat transfer process, realizing precise energy supply and effectively prolonging the service life of the catalyst. It is urgent to introduce advanced energy field coupling methods (such as microwaves) and efficient process intensification technologies (such as ultrasound) in coordination, and match appropriate reactor engineering structures to form a "method-system" deeply adapted technical system, and break through the existing technical bottlenecks from the engineering foundation. SUMMARY

[0006] Therefore, the present application aims to provide a method for preparing sustainable aviation fuel from carbon dioxide hydrogenation to overcome the defects of low heat transfer efficiency, insufficient selectivity of target products and poor stability of catalyst in existing catalytic reactions. The method can realize efficient conversion of CO2 and high-selectivity directed synthesis of SAF under mild conditions (240-360℃, 3-10MPa) through microwave-ultrasound external field coordination catalytic reaction, while relying on the external field coordination effect to reduce catalyst coking and prolong its stable operation period, solving the core pain points of traditional processes from the reaction mechanism level.

[0007] To adapt to the efficient implementation of the above method, the present application further provides a matching reaction system, which comprises a reactor, and a microwave generator and an ultrasonic transducer integrated in the reactor; the reactor is provided with a temperature sensor, a pressure sensor and a gas distribution plate, and a multi-field coordinated reaction environment that can simultaneously optimize reaction kinetics, mass transfer efficiency and thermal management can be constructed to ensure that the reactants (CO2, H2) in the method can efficiently diffuse to the active sites of the catalyst, the microwave energy can precisely act on the catalytic reaction area, and the ultrasonic cavitation effect can effectively eliminate the gas-solid mass transfer resistance, so as to ultimately ensure that the conversion efficiency, product selectivity and operation stability of the above method achieve the expected effect.

[0008] The present application provides a method for preparing sustainable aviation fuel from carbon dioxide hydrogenation, comprising the following steps: Passing carbon dioxide and hydrogen into a reactor containing a catalyst, and performing carbon dioxide hydrogenation reaction under the synergistic action of microwaves and ultrasound to obtain sustainable aviation fuel.

[0009] Preferably, the power of the microwaves is 100-300kW.

[0010] Preferably, the frequency of the ultrasound is 20-40kHz, and the power density is 0.5-1.0kW / cm 2 .

[0011] Preferably, the molar ratio of hydrogen to carbon dioxide is 3-5:1.

[0012] Preferably, the catalyst comprises one or more of ZnCr2O4 / HZSM-5, Fe-Mn-K, Na-Co7Fe3, LaFeO3 / Beta molecular sieve, and In2O3 / HZSM-5.

[0013] Preferably, the temperature of the carbon dioxide hydrogenation reaction is 240~360℃.

[0014] Preferably, the pressure of the carbon dioxide hydrogenation reaction is 3~10 MPa.

[0015] Preferably, the volume hourly space velocity (VHSV) of the carbon dioxide hydrogenation reaction is 1000-3000 h⁻¹. -1 .

[0016] The present invention also provides a system for producing sustainable aviation fuel by hydrogenating carbon dioxide, including a reactor, and a microwave generator and an ultrasonic transducer disposed on the reactor.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a method for preparing sustainable aviation fuel by hydrogenating carbon dioxide, comprising the following steps: introducing carbon dioxide and hydrogen into a reactor containing a catalyst, and carrying out a carbon dioxide hydrogenation reaction under the synergistic effect of microwave and ultrasound to obtain sustainable aviation fuel.

[0018] This invention utilizes a microwave-ultrasound synergistic catalytic reaction to efficiently convert carbon dioxide and hydrogen into sustainable aviation fuel (green aviation kerosene). Microwave energy is preferentially absorbed by polar components in the catalyst (such as ZnCr2O4), achieving rapid molecular-level heating (heating rate ≥10℃ / s) through dielectric loss effects. This results in a catalyst particle surface temperature significantly higher than the gas temperature (temperature difference 10~20℃), thereby drastically reducing the reaction activation energy and promoting CO2 activation and intermediate conversion. The ultrasonic cavitation effect generates microjets and shock waves at the gas-solid interface, effectively eliminating boundary layer resistance. The mass transfer coefficient can be increased from 0.01 mol / (m²) in conventional systems. 2 The concentration of ·s) was increased to 0.022 mol / (m 2 Simultaneously, the cleaning effect of ultrasound can delay carbon deposition on the catalyst surface and maintain stable activity. This invention solves the problems of low mass and heat transfer efficiency, low product selectivity, and easy catalyst deactivation in traditional processes, realizing the high-value conversion of CO2 and the sustainable production of green aviation fuel.

[0019] The application also provides a system for preparing sustainable aviation fuel by carbon dioxide hydrogenation. The application breaks through the traditional heating and reaction mode, and for the first time introduces a microwave energy field and an ultrasonic cavitation field into the reaction system, so that the multiple physical fields act synergistically: the microwave dielectric heating increases the surface temperature of the catalyst, and reduces the apparent activation energy; the ultrasonic cavitation effect greatly enhances the mass transfer efficiency between gas and solid; the microwave and ultrasonic synergistic effect effectively inhibits carbon deposition and prolongs the service life of the catalyst; the overall reaction can be carried out efficiently under milder temperature and pressure conditions, and has significant energy saving and carbon reduction potential. The system of the application is particularly suitable for large-scale and continuous production of sustainable aviation fuel (SAF) that meets international standards.

[0020] The application has at least the following advantages: (1) For the first time, microwave selective heating and ultrasonic cavitation mass transfer enhancement technology are integrated into a traditional carbon dioxide hydrogenation reactor, and the reaction efficiency and energy efficiency level are significantly improved through energy field synergy, the mass transfer coefficient is increased by 2 times, and the reaction activation energy is reduced by about 24%.

[0021] (2) The reaction temperature and pressure are greatly reduced, the reaction conditions are mild, the energy consumption is reduced by more than 30% compared with the Fischer-Tropsch process, energy saving and consumption reduction, and the system has the advantages of operation safety and equipment cost.

[0022] (3) Non-pure CO2 and green hydrogen can be directly used, the process is simple, no expensive purification unit is needed, and the raw material adaptability is strong; 1.2 tons of CO2 can be fixed for every 1 ton of aviation fuel produced, and negative carbon oil refining is achieved.

[0023] (4) The multi-field synergy effectively inhibits the formation of hot spots and catalyst carbon deposition, and the performance decay rate is less than 15% after 1000h of continuous operation, the system has good stability and long operation cycle; and the activity can be restored through regeneration, and has industrial amplification potential. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only show some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0025] Figure 1 The structure of the multi-field coupled reactor used in the embodiments is shown in the figure. The figure shows: 1-microwave generator; 2-quartz waveguide; 3-temperature sensor; 4-gas distribution plate; 5-material flow direction; 6-ultrasonic transducer; 7-pressure sensor; 8-reactor; 9-catalyst bed. DETAILED DESCRIPTION

[0026] The application provides a method for preparing sustainable aviation fuel by carbon dioxide hydrogenation, comprising the following steps: Carbon dioxide and hydrogen are introduced into a reactor containing a catalyst, and carbon dioxide hydrogenation is carried out under the synergistic action of microwaves and ultrasonic waves to obtain sustainable aviation fuel.

[0027] In the application, the materials and equipment used are commercially available in the art unless otherwise specified.

[0028] In the application, the molar ratio of hydrogen (H2) to carbon dioxide (CO2) is preferably 3-5:1, and can be 4:1 or 5:1. The carbon dioxide is preferably industrial CO2 capture, and the purity is preferably ≥90%, and the impurities contained are non-acidic impurities, including N2 and H2O; the hydrogen is preferably obtained by electrolysis of water from renewable energy; the carbon dioxide and hydrogen do not need to be pretreated, and the method for preparing sustainable aviation fuel according to the application is compatible with impurities such as N2 and H2O.

[0029] In the application, the flow rate of the feed gas introduced is preferably 100-300 mL / min, and can be 200 mL / min; the feed gas comprises CO2, H2 and N2, and the volume ratio of CO2, H2 and N2 is preferably 18:77:5.

[0030] In the application, the catalyst preferably comprises one or more of ZnCr2O4 / HZSM-5, Fe-Mn-K, Na-Co7Fe3, LaFeO3 / Beta molecular sieve and In2O3 / HZSM-5, and is more preferably ZnCr2O4 / HZSM-5; the HZSM-5 is short-b-axis HZSM-5; the mass ratio of ZnCr2O4 to short-b-axis H-ZSM-5 is preferably 1:1-3. In the Fe-Mn-K, Fe is the main active component, and the mass fraction is 60-90 wt%; Mn is a structure aid, and the mass fraction is 5-20 wt%; K is an electronic aid, and the mass fraction is 1-5 wt%. In the Na-Co7Fe3, the addition amount of Na is 0.01-5 wt%; in the LaFeO3 / Beta molecular sieve, the mass ratio of LaFeO3 to Beta molecular sieve is 1:1-3; in the In2O3 / HZSM-5, the mass ratio of In2O3 to HZSM-5 is 1:1-3. The particle size of the catalyst is preferably 80-120 μm.

[0031] In the application, the reactor is preferably a fixed bed reactor.

[0032] In the present application, the power of the microwave is preferably 100-300 kW, and specifically can be 200 kW, and the frequency is preferably 2.45 GHz; the power of the microwave can be adjusted in real time according to the bed temperature. The microwave is preferably generated by a microwave generator with a frequency of 2.45 GHz, coupled to the reaction area through a quartz waveguide (after impedance matching, the microwave energy is transmitted to the catalyst bed through a rectangular or circular quartz waveguide), and the surface temperature of the catalyst particles is 10-20℃ higher than the gas phase temperature through the dielectric loss effect.

[0033] In the present application, the frequency of the ultrasound is preferably 20-40 kHz, the power density is preferably 0.5-1.0 kW / cm 2 , and specifically can be 0.8 kW / cm 2 , and the power is preferably 200 kW. The ultrasound is preferably generated by an ultrasonic transducer installed on the side of the reactor, and the cavitation effect makes the gas-solid mass transfer efficiency of the reaction system increase by more than 40%. Under the action of the ultrasonic field, the gas-liquid interface generates micro-jets and shock waves due to the cavitation effect, eliminating the gas film resistance, strengthening the contact of CO2 and H2 with the catalyst surface, and greatly improving the mass transfer efficiency.

[0034] In the present application, the temperature of the carbon dioxide hydrogenation reaction is preferably 240-360℃, and specifically can be 320℃ or 350℃. The present application can reduce the temperature by 50℃ under the coupling action of ultrasound and microwave compared with the traditional external heating mode, and still has high CO2 conversion rate and product selectivity.

[0035] In the present application, the pressure of the carbon dioxide hydrogenation reaction is preferably 3-10 MPa, and specifically can be 4 MPa, 6 MPa, 8 MPa or 10 MPa.

[0036] In the present application, the volume space velocity of the carbon dioxide hydrogenation reaction is preferably 1000-3000 h -1 , and specifically can be 2000 h -1 or 2500 h -1 .

[0037] The present application also provides a system for preparing sustainable aviation fuel by carbon dioxide hydrogenation, comprising a reactor, and a microwave generator and an ultrasonic transducer arranged on the reactor.

[0038] In the present application, the reactor is preferably made of 316L stainless steel material with a pressure resistance grade of ≥10 MPa; the inside is provided with a gas distribution plate, temperature and pressure sensors, a microwave generator and an ultrasonic transducer, etc.

[0039] In the present application, the reactor 8 is the main body, and the gas distribution plate 4 and the fluidized catalyst bed 9 are arranged inside from top to bottom; the microwave is focused on the catalyst bed from the top side wall through the quartz waveguide 2, and the ultrasonic transducer 6 applies the cavitation effect from the bottom side wall; the temperature sensor 3 and the pressure sensor 7 are embedded in the wall to monitor the temperature and pressure online respectively; the material penetrates through the entire catalytic area from top to bottom. The present application realizes the multi-field synergy of microwave selective heating, ultrasonic enhanced mass transfer and high-efficiency mixing of fixed bed.

[0040] The system of the present application integrates the functional advantages of microwave selective heating and ultrasonic cavitation enhanced mass transfer, significantly improves the reaction efficiency and energy efficiency level, has high CO2 single-pass conversion rate, low energy consumption per unit product, long service life of catalyst, and can realize multiple regeneration.

[0041] The present application provides a method for preparing green aviation fuel by carbon dioxide hydrogenation, which realizes the high-value conversion of CO2 and the sustainable production of green aviation fuel through the microwave-ultrasonic multi-field synergy mechanism. Test data show that the CO2 single-pass conversion rate of the method provided by the present application is: ≥60%; the aviation fuel C8~C 16 The hydrocarbon selectivity is: ≥65wt%; wherein the paraffin content is: 50%~75%, the naphthene content is: 15%~25%, the alkene content is: 5%~15%; the sulfur content is: <5ppm, the nitrogen content is: not detected; the energy consumption per unit product is: ≤25 MJ / ton of aviation fuel; the continuous operation life of the catalyst is: >1000h; the regeneration recovery rate is: ≥90%, and the catalyst can be regenerated and recycled more than 3 times.

[0042] In order to further illustrate the present application, the method and system for preparing sustainable aviation fuel by carbon dioxide hydrogenation provided by the present application are described in detail below in combination with the drawings and examples, but they cannot be understood as limiting the protection scope of the present application.

[0043] Figure 1 The structure diagram of the multi-field coupling reactor used in the examples is shown in the figure; wherein 1-microwave generator; 2-quartz waveguide; 3-temperature sensor; 4-gas distribution plate; 5-material flow direction; 6-ultrasonic transducer; 7-pressure sensor; 8-reactor; 9-catalyst bed. The specific structure is as follows: The reactor 8 is the core container of the whole system, which is a fixed bed structure made of 316L stainless steel, and the whole is in the shape of a vertical cylinder, which contains catalysts and provides reaction space.

[0044] The catalyst bed 9 is located in the middle and lower region inside the reactor 8, which is composed of catalyst particles (ZnCr2O 4 / HZSM-5) with a particle size of 80~120μm, which is in a fluidized state under the action of gas.

[0045] Gas distribution plate 4: Set in the upper part of the reactor 8, directly above the catalyst bed 9, it is a porous sieve plate structure (pore size about 50 μm), used to uniformly disperse the feed gas (CO2 / H2 mixed gas) into the bed, to achieve good distribution.

[0046] Material flow 5: Indicates that the reaction gas flows from the top of the reactor, through the gas distribution plate 4, down through the catalyst bed 9, carrying the product out of the bottom of the reactor.

[0047] Microwave generator 1: Installed at the top of the outer wall of the reactor 8, not directly contacting the reaction material. The microwave energy generated by it is coupled into the interior of the reactor through the quartz waveguide 2.

[0048] Quartz waveguide 2: One end is connected to the microwave generator 1, the other end penetrates the reactor wall and extends to the vicinity and interior of the catalyst bed 9. Quartz material is used to withstand high temperature and high pressure and is transparent to microwaves, ensuring efficient and directional transmission of microwave energy to the catalytic reaction zone.

[0049] Ultrasonic transducer 6: Installed at the bottom of the outer wall of the reactor 8, near the gas distribution plate 4, with its vibration surface tightly attached to the wall, transmitting high-frequency ultrasonic waves (20~40 kHz) into the interior of the reactor, acting on the gas-solid interface to strengthen mass transfer.

[0050] Temperature sensor 3: Inserted into the interior of the reactor 8, with the probe located in the catalyst bed 9, used to monitor the bed temperature in real time and feedback to adjust the microwave power.

[0051] Pressure sensor 7: Installed on the wall of the reactor 8, usually in the area above the bed, used to monitor the reaction system pressure in real time, ensuring stable operation within the range of 3~10 MPa.

[0052] Example 1: Performance verification of microwave-ultrasonic synergy Reactor configuration: 316L stainless steel fixed bed reactor with an inner diameter of 25 mm and a height of 400 mm, effective loading volume of 100 mL, top equipped with 50 μm gas distribution plate and 2.45 GHz microwave waveguide (power 200 kW), side wall coupled with 20 kHz ultrasonic transducer (power 200 kW).

[0053] Catalyst: ZnCr2O4 / short b-axis H-ZSM-5 mixed catalyst 10 g (mass ratio 1:3) with particle size distribution of 80~120 μm.

[0054] Reaction conditions: Temperature 320℃, pressure 4 MPa, volume space velocity 2000 h -1, the composition of the feed gas is CO2 / H2 / N2=18 / 77 / 5 (vol%), the flow rate of the feed gas is 200 mL / min, the microwave power is 200 kW, and the ultrasonic power is 200 kW (power density 0.8 kW / cm 2 ).

[0055] Results: After stable operation for 24 h, the CO2 conversion rate is 65.2%, the C8~C 16 hydrocarbon selectivity is 76.4%, of which the mass fraction of paraffin is 62.3%, the mass fraction of naphthene is 22.8%, and the mass fraction of olefin is 14.9%. The energy consumption per unit product is 23.8 MJ / ton.

[0056] After 100 h of operation, the carbon deposition on the catalyst is 1.8% (measured by thermogravimetric analysis (TGA) method).

[0057] Comparative Example 1: Traditional external heating method Under the same reactor, catalyst, and feed conditions as in Example 1, the microwave and ultrasonic systems are turned off, and external electric heating is used to maintain the bed temperature at 320℃.

[0058] Results: After stable operation for 24 h, the CO2 conversion rate drops to 44.7%, the aviation kerosene (C8~C 16 hydrocarbon) selectivity is 61.5%, of which the mass fraction of paraffin is 51.2%, the mass fraction of naphthene is 16.9%, and the mass fraction of olefin is 5.4%.

[0059] After 100 h of operation, the carbon deposition on the catalyst reaches 4.2% (measured by thermogravimetric analysis (TGA) method).

[0060] Comparative Example 2 The difference from Comparative Example 1 is that the reaction temperature is increased to 380℃, achieving the same conversion rate level (66.7%) as in Example 1, but the energy consumption is increased by 42% compared to Example 1, and the energy consumption per unit product is 33.8 MJ / ton.

[0061] Example 2: Long-term operation and regeneration test Under the conditions of temperature 350℃, pressure 5 MPa, and volume space velocity 2500 h -1 , the remaining conditions are the same as in Example 1, and the continuous operation is carried out for 1000 h.

[0062] Results: From 0~600 h, the CO2 conversion rate is stable at 63~65%, the aviation kerosene selectivity is 66~68%, of which the mass fraction of paraffin is 60.6~61.2%, the mass fraction of naphthene is 17.8~18.0%, and the mass fraction of olefin is 7.6~7.8%; At 600-800 h, the CO2 conversion rate slowly decreased to 60%, the aviation fuel selectivity was 69.8%, the mass fraction of paraffins was 60.4%, the mass fraction of naphthenes was 17.2%, and the mass fraction of olefins was 7.4% (all the above values are average values in the running period) ; At 800-1000 h, the CO2 conversion rate was 55%, the aviation fuel selectivity was 67.3%, the mass fraction of paraffins was 58.9%, the mass fraction of naphthenes was 16.8%, and the mass fraction of olefins was 7.3% (all the above values are average values in the running period) ; After the running, regeneration was carried out: the feed was cut off, nitrogen-oxygen mixed gas containing 5% oxygen by volume (50 mL / min) was continuously introduced, the temperature was increased to 450℃ at a rate of 5℃ / min, and the temperature was kept for 3 h, the carbon deposition rate decreased from 8.5% to 0.9%, and after regeneration, the catalyst activity recovered to 61%, the aviation fuel selectivity was 66.9%, the mass fraction of paraffins was 60.6%, the mass fraction of naphthenes was 16.5%, and the mass fraction of olefins was 5.9%.

[0063] Example 3: Raw material adaptability test A certain chemical plant captured CO2 (purity 92%, containing 5vol% N2, 3vol% H2O) and photovoltaic electrolytic hydrogen (purity 99.5%) as raw materials, H2 / CO2 molar ratio = 5, at 320℃, 4 MPa, space velocity 2000 h -1 and multi-field synergy, and the other conditions were the same as in Example 1.

[0064] Results: The CO2 conversion rate was 63.8%, the aviation fuel selectivity was 67.7%, and the impurity content of the product (containing SO2 <10 ppm, NOx <1 ppm) met the international sustainable aviation fuel ASTM D7566 standard (aviation turbine fuel standard specification containing synthetic hydrocarbons), indicating that the method had good raw material tolerance.

[0065] The above test data show that the present application uses microwave-ultrasonic multi-field synergy catalysis, the microwave provides a local high temperature field to promote the intrinsic reaction kinetics, the ultrasonic optimizes the reactant transfer and product desorption process, and under the synergistic effect, the apparent activation energy decreases from 85 kJ / mol to 65 kJ / mol, and the reaction temperature required for the same conversion rate decreases by 30-50℃. The present application significantly improves the reaction efficiency, selectivity and process energy efficiency of CO2 hydrogenation to green aviation fuel through energy field coupling innovation, and has the advantages of strong raw material adaptability, long catalyst life and outstanding carbon negative benefit, providing a reliable and economic technical path for the industrialized production of sustainable aviation fuel.

[0066] Although the above embodiments have been described in detail, it should be understood that the detailed description is merely illustrative of the present application, not completely describing all the embodiments of the present application. Based on the embodiments of the present application, other embodiments can be obtained without creative labor, which are also within the scope of the present application.

Claims

1. A method for producing sustainable aviation fuel by hydrogenating carbon dioxide, characterized in that, Includes the following steps: Carbon dioxide and hydrogen are introduced into a reactor containing a catalyst, and under the synergistic effect of microwaves and ultrasound, a carbon dioxide hydrogenation reaction is carried out to obtain sustainable aviation fuel.

2. The method according to claim 1, characterized in that, The power of the microwave is 100~300kW.

3. The method according to claim 1 or 2, characterized in that, The ultrasound frequency is 20~40kHz, and the power density is 0.5~1.0kW / cm². 2 .

4. The method according to claim 1, characterized in that, The molar ratio of hydrogen to carbon dioxide is 3~5:

1.

5. The method according to claim 1 or 4, characterized in that, The catalyst includes one or more of ZnCr2O4 / HZSM-5, Fe-Mn-K, Na-Co7Fe3, LaFeO3 / Beta molecular sieve, and In2O3 / HZSM-5.

6. The method according to claim 1, characterized in that, The temperature for the carbon dioxide hydrogenation reaction is 240~360℃.

7. The method according to claim 1 or 6, characterized in that, The pressure of the carbon dioxide hydrogenation reaction is 3~10 MPa.

8. The method according to claim 1, characterized in that, The volume hourly space velocity (VHSV) of the carbon dioxide hydrogenation reaction is 1000-3000 h⁻¹. -1 .

9. A system for producing sustainable aviation fuel by hydrogenating carbon dioxide, characterized in that, It includes a reactor, and a microwave generator and an ultrasonic transducer mounted on the reactor.

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