241 results about "Supercritical drying" patented technology

The invention provides quantum dot aerogel, a quantum dot light-emitting device and a preparation method thereof, and the preparation method comprises the following steps: adding a silane coupling agent into quantum dots to form modified quantum dots with silanol groups on the surfaces; uniformly stirring a silicon dioxide precursor and absolute ethyl alcohol, slowly adding deionized water and a catalyst, and stirring to form silicon dioxide sol; adding the modified quantum dots into silicon dioxide sol to form a mixed solution; placing the mixed solution in a closed container, and standing to form gel; putting the gel into absolute ethyl alcohol for aging treatment; and carrying out supercritical drying treatment on the aged gel to obtain the quantum dot aerogel composite material. The light-emitting performance of the quantum dots and the heat insulation performance of the aerogel are perfectly combined, the high temperature resistance and blue light resistance of the quantum dot aerogel composite material film layer can be greatly improved, the preparation method is simple, and the application range of the quantum dots can be greatly widened.

The invention relates to the technical field of thermal insulation material preparation, and discloses an aerogel composite metal film thermal insulation material and a preparation method thereof, and the preparation method comprises the following steps: metal film surface treatment; performing fiber-metal film needling; through mold forming and porosity control, a fiber-metal film prefabricated part with a specific shape and a high-porosity structure is prepared; soaking and aging the sol, realizing efficient permeation and filling of the sol in the fiber-metal film prefabricated member through staged pressure control, and completing conversion from the sol to gel in a low-temperature aging stage, so that a uniform and stable nano-particle continuous phase is constructed in the fiber-metal film prefabricated member, and a gel-containing fiber-metal film prefabricated member is formed; the preparation method comprises the following steps: preparing a fiber-metal film preform, performing supercritical drying, thoroughly removing a solvent under the condition of not damaging a gel network structure by utilizing the characteristic that alcohol fluid has no gas-liquid interface surface tension in a supercritical state aiming at the fiber-metal film preform containing gel, and further preparing the aerogel composite metal film heat insulation material.

The invention relates to a covalent organic framework modified cellulose nanofiber composite diaphragm which is characterized in that cellulose nanofiber is used as a matrix, an amide type or amine type covalent organic framework layer is grown on the surface in situ, the loading capacity of a covalent organic framework is regulated and controlled, and a hierarchical pore structure with gradient pore diameter is constructed; the preparation method comprises the following steps: synthesizing a covalent organic framework precursor bonded with an imine bond on the surface of cellulose nanofiber in situ by a one-pot method under an acidic mixed solution and a heating condition, and regulating and synchronously reducing to convert into an amine type covalent organic framework; or after the imine bond bonded covalent organic framework is synthesized in two stages, the imine bond bonded covalent organic framework is selectively converted into an amide type covalent organic framework through oxidation modification; the obtained cellulose nanofiber compound coated with the covalent organic framework is subjected to the processes of film forming, solvent replacement, supercritical drying and the like, and the composite diaphragm is obtained; the diaphragm has excellent electrolyte wettability, high liquid absorption rate, good ionic conductivity and thermal stability, and can promote uniform transmission of lithium ions and inhibit growth of lithium dendrites.

The invention belongs to the technical field of aerogel, and relates to a method for preparing aerogel by carbon dioxide supercritical drying based on gradient drying control, which comprises the following steps: preparing basic catalytic liquid, preparing silica sol, gelatinizing and aging, performing surface modification, pretreating a drying system, placing and sealing materials, replacing and boosting carbon dioxide, and performing gradient depressurization and material taking. After pressure reduction is completed, aerogel is obtained; by accurately controlling the temperature, the pressure and the pressure increasing and decreasing rate in the carbon dioxide supercritical drying process, skeleton collapse and size shrinkage caused by capillary stress are effectively avoided, and the morphology retentivity and the structural integrity of the aerogel are remarkably improved. The obtained aerogel is light blue and semitransparent, has no cracks on the surface, has the specific surface area of more than or equal to 850m < 2 > / g and the heat conductivity of less than or equal to 0.020 W / (m.K), has excellent heat insulation performance, structural stability and mechanical strength, and is suitable for the fields of building energy conservation, aerospace, microelectronic packaging, flexible heat management and the like.

The invention relates to a chitosan-collagen synergistic self-assembly fiber material and a preparation method thereof, and belongs to the technical field of biological fiber materials. According to the method, the mass ratio of chitosan to collagen is controlled, co-assembly is induced through hydrogen bonds and electrostatic interaction in a low-temperature PBS solution, and then glutaraldehyde crosslinking, gradient dehydration and supercritical drying are performed to prepare the freeze-dried fiber. The obtained material completely retains the triple helix conformation of collagen, and has excellent conformation stability and enzymolysis resistance. The mechanical strength of the composite fiber is remarkably improved, and the composite fiber has excellent antibacterial property and cell affinity. The process does not need a toxic cross-linking agent, the operation is simple and convenient, and the prepared fiber is suitable for the high-end biomedical fields of tissue engineering scaffolds, intelligent antibacterial dressings, degradable nerve conduits and the like.

The invention discloses a high-toughness thermal bridge blocking material and a preparation method thereof, namely a metal fibrofelt reinforced aerogel composite material and a preparation method thereof, and belongs to the technical field of thermal insulation materials. The preparation of the metal fibrofelt reinforced aerogel composite material is realized by adopting the processes of metal fibrofelt modification, fiber prefabricated part forming, sol dipping and aging, supercritical drying, heat treatment and the like. The composite material prepared by the invention has the characteristics of light weight, low thermal conductivity, high temperature resistance, high pressure bearing capacity, high toughness and the like, and can be used as a thermal bridge blocking material in the fields of aerospace, thermal equipment and the like.

The invention provides a hollow fiber reinforced aerogel composite material and a preparation method thereof, and relates to the field of aerogel materials. The preparation method of the hollow fiber reinforced aerogel composite material comprises the following steps: preparation of aluminum silica sol, modification compounding, vacuum impregnation, gel aging and supercritical drying. According to the hollow fiber reinforced aerogel composite material and the preparation method thereof, the sound insulation performance of the aerogel material can be effectively improved on the premise of overcoming the existing defects (the defect of a porous structure of aerogel, weak binding force among aerogel particles and thermal stress caused by mismatching of thermal expansion coefficients of aluminum and silicon components) of the aerogel material; the strength, the toughness and the heat insulation performance of the aerogel material are synchronously improved.

The invention relates to aerogel with high heat insulation performance and a preparation method thereof, and belongs to the technical field of aerogel materials. The aerogel is prepared from a silicon source, nano heat insulation particles, a surface modifier, a catalyst and a solvent. The nano heat insulation particles are a compound of zirconium dioxide and hollow glass beads, and the surface modifier is a mixture of trimethylchlorosilane and gamma-aminopropyltriethoxysilane. The preparation method comprises the steps of sol preparation, modification treatment, gelation, aging and supercritical drying. Through compounding and synergistic effects of specific components, the mesoporous network structure of the aerogel is remarkably optimized, so that the aerogel has ultralow normal-temperature thermal conductivity, relatively high compression strength and excellent thermal stability, and the problem that heat insulation performance and mechanical strength of traditional aerogel are difficult to consider at the same time is solved; the method is suitable for the fields of building insulation, industrial pipelines and aerospace.

The invention discloses a preparation method of an aerogel laminated composite heat insulation pad, and relates to the technical field of aerogel heat insulation pads, and the preparation method comprises the following steps: mixing and dispersing a silane precursor and absolute ethyl alcohol, adding a basic catalyst, hydrolyzing to generate sol, and aging to form prefabricated sol; adding a flame retardant, a smoke retardant and reinforced fibers, dispersing and gelatinizing, and carrying out supercritical drying to obtain an aerogel block; and coating basalt fiber non-woven fabric with the aerogel slurry to form a base layer, laminating a plurality of layers, and carrying out hot-pressing curing, cooling, post-curing, cutting and edge covering to obtain the composite heat insulation pad. According to the invention, by optimizing the ratio of silane and a drying process, the pore structure and the thermal stability of the aerogel are obviously improved; the flame-retardant, mechanical and heat-insulating properties are improved through multi-component collaborative design, and the obtained heat-insulating pad has the characteristics of low heat conductivity, high strength, excellent flame retardance and light weight, and is suitable for multiple heat-insulating and flame-retardant fields.

The invention relates to the technical field of preparation of high polymer materials and intelligent response materials, in particular to a preparation method of polyacrylamide for treatment. And constructing a quaternary polymerization system with acrylamide, a temperature-sensitive monomer and a zirconium-based metal organic framework-graphene quantum dot composite material. Magnetic response interpenetrating network gel is formed by induction of a photo-magnetic synergistic field, bacterial cellulose nanofibrils and a calcium silicate layered structure are introduced through a biomimetic mineralization technology, and the hierarchical porous carrier is prepared by combining a microfluidic crushing technology and a supercritical drying technology. Finally, through an intelligent regeneration mechanism of bimetal coordination activation and high-frequency magnetic field triggering, the material is endowed with multiple stimulation response characteristics, high adsorption capacity and in-situ regeneration capacity, and the mechanical strength and the salt resistance are remarkably improved through a pearl-layer-like micro-nano laminated structure. The method is suitable for industrial wastewater advanced treatment and emergency pollution repair scenes.

The invention relates to a composite aerogel for water treatment and a preparation method thereof, and the preparation method comprises the following steps: activating graphene oxide, and then carrying out amidation reaction on the activated graphene oxide, aminated beta-cyclodextrin and hexamethylenediamine to obtain modified graphene; then carrying out hydrothermal reaction on the GO / BiOCOOH composite material, a Bi < 3 + > solution and formamide to obtain a modified GO / BiOCOOH composite material; crosslinking in a lignin aqueous solution to obtain hydrogel; and finally, performing supercritical drying to obtain the composite aerogel. The preparation method has the beneficial effects that by constructing macroscopic blocky aerogel, the problems that a powder material is easy to lose and difficult to recycle are effectively solved; the high photocatalytic activity is still kept under the condition that iodine doping is not used, and the possibility of secondary pollution of free iodine to a water body due to instability of the material is reduced; under the synergistic effect of the aerogel and the photocatalytic reaction, the efficient proceeding of the adsorption and desorption-photocatalytic reaction is realized; the material is high in stability, easy to recover, capable of being recycled through simple desorption, high in cycle index and long in service life.

The invention relates to a method for treating printing and dyeing wastewater. The method comprises the following steps: neutralization regulation, primary filtration for removing scum, decoloration and flocculation, secondary filtration, pH regulation, catalytic degradation under visible light, MBR membrane treatment and discharge. The printing and dyeing wastewater treatment process provided by the invention is compact in link, the first-stage filtration, decoloration flocculation and second-stage filtration in the treatment process all adopt conventional technical means in the field, the operation is simple and convenient, the cost is low, and a special bismuth-based aerogel composite material is used as a catalyst for photocatalytic degradation at the rear end; the aerogel is prepared by cross-linking a modified graphene oxide / BiOCOOH composite photocatalyst with an acrylic polymer matrix and then carrying out supercritical drying, so that macroscopic immobilization of a nano catalyst is realized. According to the method, the technological process is compact, the cationic dye which is difficult to biologically treat can be efficiently degraded, the industrial problems that a powder catalyst is easy to lose and difficult to recycle are solved, key indexes such as COD and chromaticity of the treated wastewater are remarkably reduced, and the treated wastewater can be discharged after reaching the standard.

The invention discloses a preparation method of a nano-porous polyimide aerogel sandwich cylindrical structure and the structure, and belongs to the field of aerogel sandwich structure preparation. In order to solve the problem that an existing sandwich structure is difficult to consider mechanical and heat-insulating properties, the scheme comprises the steps that an inner-layer cylindrical shell mold and an outer-layer cylindrical shell mold which are coaxially arranged are constructed, and an annular gap is formed; the preparation method comprises the following steps: preparing a polyamide acid precursor solution, performing chemical imidization, injecting the polyamide acid precursor solution into a gap, regulating interface combination through gel curing, solvent replacement and supercritical drying triple contractility, and combining interference fit assembly to form an inner-layer cylindrical shell / aerogel sandwich layer / outer-layer cylindrical retaining sleeve integrated structure. According to the method, the blank of the integrated forming technology of the aerogel sandwich cylinder structure is solved, and the prepared structure has light weight, ultralow heat conductivity and mechanical stability, is suitable for the scenes of aerospace, weaponry, industrial pipeline heat insulation and the like, and has important industrial value for improving the structural performance and energy utilization efficiency under complex working conditions.

The invention provides a preparation method of ultra-low thermal conductivity silicon-based aerogel, and relates to the field of aerogel material preparation, and the preparation method comprises the following steps: S1, preparing a component A and a component B. The component A is prepared by fully mixing a silicon source, a modified silicon dioxide seed crystal, absolute ethyl alcohol and deionized water, then slowly adding an acid catalyst, and carrying out hydrolysis; the component B is a basic catalyst solution obtained by uniformly mixing deionized water and stronger ammonia water; step S2, gelling: fully mixing the component A and the component B to obtain wet gel, and then mixing the wet gel with a fiber felt to obtain a wet gel felt; step S3, aging; and S4, performing supercritical drying. According to the method, by introducing the modified silicon dioxide seed crystal, the thermal conductivity of a solid structure of the aerogel is effectively reduced, meanwhile, formation of macropores, communicating pores and the like is inhibited, and the performance of the aerogel is improved.

The invention discloses a methane dry reforming catalyst and a preparation method thereof, and belongs to the technical field of catalysts.The catalyst is composed of 480 parts to 600 parts of Fe2O3, 60 parts to 75 parts of NiO, 1020 parts to 1530 parts of Al2O3, 16.2 parts to 82.5 parts of La2O3 and 9 parts to 18 parts of Gd2O3, and the catalyst is of an integral aerogel structure with a honeycomb-shaped or latticed macroscopic morphology; the preparation method comprises the following steps: S1, preparing a precursor solution; s2, adding a gel accelerant; s3, carrying out integral gel forming; s4, aging the wet gel; s5, solvent replacement; s6, performing supercritical drying; s7, calcining; according to the invention, active site design, a structure stabilization strategy and material form innovation are closely combined, and the prepared monolithic aerogel oxygen carrier not only shows a high CH4 / CO2 conversion rate and an ideal H2 / CO ratio, but also has excellent cycle stability and extremely low bed pressure drop; the core problems that in the prior art, the activation capacity and the carbon removal capacity are not matched, the high-temperature cycling stability is poor, and the engineering applicability of a powder material is limited are effectively solved.

This application relates to the field of oxide target technology, specifically disclosing a high-density, high-uniformity IGO target and its preparation method. The preparation method of the high-density, high-uniformity IGO target includes the following steps: [The text abruptly shifts to a different topic]...containing In... 3+ Ga 3+ A mixed solution of metal ions and ammonia solution is mixed to obtain a precursor precipitate, which is then allowed to stand for a preset aging time. The aged precursor precipitate is then subjected to supercritical drying and calcination to obtain IGO powder. The IGO powder is mixed with a sintering aid and then subjected to ball milling, air classification, molding, cold isostatic pressing, spark plasma sintering, and heat treatment to obtain the IGO target material. The IGO target material obtained in this application has uniform composition, high density, and stable microstructure. The transparent conductive film prepared using this target material has high visible light transmittance and excellent conductivity, solving the problems of uneven composition, low density, and poor quality of sputtered films in existing target materials.

The application discloses a method for preparing ZrSiO4 aerogel by sol-gel combined supercritical drying, and the wet gel is prepared by using a silicon source, a zirconium source and a crosslinking agent as raw materials, then the low-density and high-porosity dry gel is obtained by CO2 supercritical drying, and then the control of the gel component and structure is realized by controlling the heat treatment process, so that the ZrSiO4 aerogel with low density, high porosity, excellent high-temperature resistance and good thermal stability is obtained. Through the control of the component, the gel process and the heat treatment process, the controllable preparation and performance regulation of the ZrSiO4 aerogel are realized.

The invention relates to an in-situ nanowire skeleton reinforced aerogel composite material and a preparation method thereof. The preparation method comprises the following steps: in-situ growth of a nanowire skeleton from quartz fiber felt, preparation of silica sol, sol impregnation and aging, and supercritical drying. The internal pores of the prepared nanowire skeleton reinforced aerogel composite material are refined and segmented by an in-situ grown nanowire network, the interface bonding of nanowires and aerogel is improved through interlocking, fracture under the action of external force is prevented, the structural performance of the aerogel composite material is improved, and the performance of the aerogel composite material is improved. The high-temperature-resistant and low-thermal-conductivity nanowire porous framework composite silicon oxide aerogel thermal insulation material is prepared by a simple and controllable process.

The application relates to the technical field of functional materials, and discloses a conductive polymer composite material and a preparation method thereof, which comprises the following steps: providing an oil phase solution comprising an organic solvent and a polymer, and a water phase solution comprising water, graphene oxide and carbon nanotubes; mixing the oil phase solution with the water phase solution, performing homogenization treatment, and then performing supercritical CO2 drying on the obtained graphene oxide stable Pickering emulsion to remove the organic solvent; then adding a reducing agent to perform a reduction reaction; and finally performing heating drying to remove water, so that the conductive polymer composite material is obtained. In the application, the carbon nanotubes are used as conductive fillers, the graphene oxide stable Pickering emulsion is used as a template, and the supercritical anti-solvent method is used to remove the organic solvent; then the graphene oxide is reduced into reduced graphene oxide with conductivity, and the reduced graphene oxide and the carbon nanotubes form double conductive fillers, so that the conductivity of the prepared conductive polymer composite material can reach 211 S.m ‑1 under the condition of low conductive filler content.

The application discloses a kind of superhigh temperature self-adaptive insulated cable of composite and preparation method thereof, which uses carbon nanotube fiber bundle as conductor, multiple layer aerogel-ceramic nanofiber composite felt as insulator, stress buffer layer formed by negative thermal expansion coefficient material is arranged between layers, and the outer sheath is chemical vapor infiltration SiC carbon fiber braided sleeve.The cable of the application has the advantages of ultra-light, high thermal stability, self-adaptive sealing and strong thermal shock resistance, and is suitable for extreme high temperature environment above 800 DEG C;The preparation method includes supercritical drying, pre-stretching winding and other key processes, to realize the high performance and reliability of the cable.

The invention provides a substrate processing device. The substrate processing device comprises a conveying block and a plurality of processing blocks. The conveying block is provided with a conveying device used for conveying the substrate. The plurality of processing blocks are disposed adjacent to the transport block and process the substrate transported by the transport device. In addition, each processing block includes a liquid processing assembly and a drying assembly. The liquid processing unit performs a liquid film forming process for forming a liquid film on the upper surface of the substrate. The drying assembly performs supercritical drying treatment, and the supercritical drying treatment enables the substrate after the liquid film forming treatment to be in contact with a treatment fluid in a supercritical state, so that the substrate after the liquid film forming treatment is dried. The liquid processing unit and the drying unit included in the same processing block are arranged on the same side with respect to the moving direction of the conveying device of the conveying block. The present invention enables a series of substrate treatments including liquid treatments and supercritical drying treatments to be optimized.

The application provides a kind of co-woven three-dimensional interpenetrating network reinforced aerogel composite material and its preparation method and application.The composite material is composed of reinforced phase and matrix phase, the reinforced phase is three-dimensional interpenetrating network fiber felt prepared by integrated weaving or needling process, containing hollow fiber and solid quartz fiber, which are interpenetrated and entangled in three-dimensional space to form a continuous network skeleton;The matrix phase is silica-based aerogel filled and coated network pores.The preparation method includes the steps of forming, sol impregnation, gelation and aging, supercritical drying and other steps of co-woven preform, and can also include hydrophobic post-processing.The material has the characteristics of light weight, high strength, ultra-low thermal conductivity and excellent wave-transparent performance, and is suitable for hypersonic aircraft radome, antenna window, radar fairing and satellite communication wave-transparent components, which can meet the requirements of load bearing, heat insulation and wave-transparent integration.

A substrate processing apparatus includes: a processing container including an internal space where a supercritical drying process is performed on a substrate having a surface to which a liquid is attached, by using a processing fluid in a supercritical state; a housing including a processing region where the processing container is disposed, and a carry-in / out region where carry-in / out of the substrate is performed; a delivery section that is provided in the carry-in / out region to deliver the substrate to / from a substrate transfer arm entering the carry-in / out region from an outside of the housing; a substrate transfer section that transfers the substrate between the delivery section and the processing container; and a gas supply provided in the carry-in / out region to supply a dry gas to the processing container.

The invention discloses a forming method of an aerogel heat insulation part, which comprises the following steps: selecting a needling die, a forming die and a porous pressing plate according to the shape and the size of a target heat insulation part, needling and forming a fiber preform on the needling die, coating the preform with demolding cloth, and sewing at the edge; the prefabricated body is arranged in a forming mold, the mold gap is adjusted twice, two-step vacuum-assisted sol-gel dipping compounding is conducted, gel aging, solvent replacement and supercritical drying are completed together with the mold, and a finished product is obtained after demolding. According to the method, machining is not needed, fiber completeness can be kept, thin part machining cracking is effectively avoided, the product thickness precision and surface flatness are improved, the defects of air holes, insufficient pouring and the like are overcome, and the method is suitable for preparing thin aerogel heat insulation parts of various structures.

The invention provides a preparation method and application of an ultra-transparent silicon dioxide aerogel thermal insulation material. The method comprises the following steps: dissolving a nonionic surfactant in an acidic solvent, and then adding double silicon sources for hydrolysis to obtain a silicon source precursor; dropwise adding a basic catalyst into the silicon source precursor solution, and carrying out sol-gel reaction to obtain wet gel; and putting the wet gel into a drying oven, carrying out aging treatment, and then carrying out solvent replacement and supercritical drying to obtain the ultra-transparent silicon dioxide aerogel. The prepared aerogel has the heat conductivity coefficient of 0.0259 W / m.K to 0.0339 W / m.K, the light transmittance of 67% to 95% and the water contact angle of 102 degrees to 121 degrees, the temperature of the aerogel is 3.5 DEG C lower than that of a common glass window in simulation of a building energy-saving window, the temperature of the aerogel is 27.3 DEG C higher than that of a common solar heat collection device in simulation of a solar heat collection device, the problem that low heat conductivity coefficient, high light transmittance and water repellency cannot be achieved at the same time is solved, and the aerogel is suitable for being used in a building energy-saving window and a building energy-saving window. The method has huge application value in the fields of building energy conservation, solar heat collection systems, super transparent heat insulation, deep space exploration and the like.

The invention discloses a synthesis process of tungsten hexafluoride, and relates to the technical field of special gas synthesis. The process comprises the following steps: mixing ammonium fluoride and hydrofluoric acid to prepare an activation solution, carrying out ultrasonic activation treatment on tungsten powder to obtain pretreated tungsten powder, and reacting the pretreated tungsten powder with fluorine gas at a certain temperature and pressure to prepare a liquefied crude product tungsten hexafluoride; the preparation method comprises the following steps: by taking aluminum sec-butoxide and the like as raw materials, carrying out sol-gel and ethanol supercritical drying and calcining to prepare highly porous activated aluminum oxide; gasifying the crude tungsten hexafluoride, adsorbing with activated aluminum oxide, and rectifying to obtain purified tungsten hexafluoride liquid; and finally, dissolving in liquid sulfur dioxide, treating under illumination with the wavelength of 395nm, and carrying out distillation separation to obtain high-purity tungsten hexafluoride. According to the method, the activation pretreatment is combined with multi-stage purification, so that the purity and the synthesis efficiency of tungsten hexafluoride are remarkably improved.

The invention relates to the technical field of preparation of nano aluminum oxide functional materials, in particular to a method for preparing nano aluminum oxide based on gradient centrifugation and a supercritical technology. The method comprises the following steps: carrying out dispersion treatment on a hydrophilic solvent, an aluminum oxide raw material and a dispersing agent to obtain initial slurry; under the condition of constant temperature, the initial slurry is subjected to graded grinding, and refined slurry is obtained; the graded grinding sequentially comprises first-stage grinding, second-stage grinding and third-stage grinding; carrying out gradient centrifugation on the refined slurry to obtain concentrated slurry; the gradient centrifugation sequentially comprises first-stage centrifugation, second-stage centrifugation and third-stage centrifugation; carrying out supercritical drying on the concentrated slurry by using carbon dioxide and a silane coupling agent to obtain coarse alumina powder; and drying the coarse alumina powder in vacuum to obtain the nano alumina. According to the method, through multi-unit collaborative integration of graded grinding, gradient centrifugation and supercritical drying, the production target of high-purity, narrow-particle-size-distribution and low-agglomeration-rate nanometer aluminum oxide is achieved, and the use performance of the nanometer aluminum oxide product is remarkably improved.

Disclosed herein is a metal oxide aerogel catalyst for hydrogenation and / or hydrodeoxygenation, a method for preparing the same, and a method for hydrogenation and / or hydrodeoxygenation using the same. The catalyst consists of a metal and an oxide thereof, and the catalyst is in a form of an aerogel produced by supercritical drying. The catalyst has an effect of providing high hydrogenation and / or hydrodeoxygenation efficiency of an oxygen-containing compound.

This invention provides a titanium-aluminum composite support and its preparation method, a hydrogenation catalyst, and a hydrogenation catalyst for heavy petroleum distillate oil. The preparation method of the titanium-aluminum composite support includes mixing a mixture of an aluminum source, a titanium source, and a template agent with a mixture of water, alcohol, and acid to obtain a wet gel; subjecting the wet gel to supercritical CO2 drying and calcination to obtain the titanium-aluminum composite support. This invention also provides a hydrogenation catalyst made from the above-mentioned titanium-aluminum composite support. Furthermore, this invention provides a hydrogenation catalyst for heavy petroleum distillate oil comprising the above-mentioned hydrogenation catalyst. The above-mentioned titanium-aluminum composite support has a mesoporous structure with a concentrated pore size distribution, and the hydrogenation catalyst made from this titanium-aluminum composite support exhibits high denitrification activity in the hydrogenation process of coking wax oil.

The invention provides a green low-temperature preparation method of nano aramid fiber aerogel based on a bio-based solvent, and relates to the technical field of aerogel preparation, and the green low-temperature preparation method comprises the following steps: immersing nano aramid fiber into an alkaline solution for pretreatment, and washing with water until the nano aramid fiber is neutral; dispersing the pretreated nano aramid fiber in a bio-based solvent, adding an ionic liquid, and performing stirring treatment under an ultrasonic condition to obtain a nano aramid fiber dispersion liquid; adding a cross-linking agent into the dispersion liquid, and standing for gelation to obtain wet gel; the wet gel is subjected to freeze drying, and the nano aramid fiber aerogel based on the bio-based solvent is obtained; and carrying out heat treatment in a normal-pressure nitrogen atmosphere after freeze drying. A bio-based solvent is adopted to replace a traditional toxic solvent, plant ash extracting solution pretreatment and multi-stage low-temperature freeze drying are combined to replace supercritical drying, and based on the synergistic effect of a cross-linking agent compounding system and ionic liquid, the technical problems that in the prior art, solvent toxicity is high, energy consumption is large, the structure is prone to collapse, and material performance is insufficient are solved.