31 results about "Acid strength" patented technology

The present invention provides an onium salt capable of generating an acid with moderate acid strength and low diffusion, a chemically amplified positive-type resist composition containing the same, and a method for forming a resist pattern using the resist composition. [Solution] An onium salt represented by the following formula (A). TIFF2026090779000330.tif29102

This invention provides a zinc-modified composite molecular sieve catalyst, its preparation method, and its application, relating to the field of molecular sieve catalysts. The zinc-modified composite molecular sieve catalyst comprises zinc and a composite molecular sieve, wherein the composite molecular sieve is an MCM-22 / MCM-41 composite molecular sieve, and the zinc content is 1%-10% by weight of the total weight of the zinc-modified composite molecular sieve catalyst. The catalyst provided by this invention features an MCM-22 / MCM-41 composite molecular sieve with a microporous-mesoporous composite structure, exhibiting good thermal stability and resistance to decomposition during the preparation of diisopropylnaphthalene, and possessing high overall acid strength. Zinc modification adjusts the ratio and intensity distribution of Brønsted (B) and Lewis (L) acids in the MCM-22 / MCM-41 composite molecular sieve, optimizing the synthesis process, enhancing the alkylation performance of the catalyst, and improving the conversion rate of raw materials and the selectivity of diisopropylnaphthalene.

The invention discloses a carrier for a diesel hydrofining catalyst as well as a preparation method and application of the carrier, and belongs to the technical field of hydrofining catalyst carriers. According to the carrier prepared by the method, halogen elements are directly introduced, for example, hydroxyl groups on the surface of the carrier are replaced by adding fluorine, so that the capability of dissociating protons is enhanced. Meanwhile, fluorine can increase the number of B acid centers and the acid strength on the surface of the catalyst, reduce Lewis acid centers, enhance the cracking function of the catalyst and reduce coke formation and carbon deposition on the surface of the catalyst. According to the diesel oil hydrofining catalyst, a Mo-Ni-P combination is adopted as a hydrogenation active component, a proper pore structure and a large specific surface area can be provided for the catalyst by combining a carrier, reactant molecules can approach to the active component on the surface, and conditions are provided for fully playing the role of the active component; the content of strong acid on the surface of the carrier is reduced, so that catalyst deactivation caused by coking reaction is slowed down, and the stability of the catalyst is enhanced.

The invention discloses a cation modified gallium-silicon MTW molecular sieve catalyst as well as a preparation method and application thereof, and relates to the technical field of molecular sieve catalysts. The cation modified gallium-silicon MTW molecular sieve catalyst provided by the invention at least comprises a gallium-silicon MTW molecular sieve; the alkali metal cations are loaded on the gallium-silicon type MTW molecular sieve; the acid sites of the cation modified gallium silicon type MTW molecular sieve catalyst comprise a Bronsted acid and a Lewis acid. The cation-modified gallium-silicon MTW molecular sieve catalyst prepared by the invention takes gallium and silicon as main framework elements, and after being modified by alkali metal cations, the cation-modified gallium-silicon MTW molecular sieve catalyst has appropriate acid strength, uniform acid site distribution and unique one-dimensional twelve-membered ring pore channel shape-selective effect of the MTW molecular sieve, and is used for preparing acrylic acid by dehydrating lactic acid; the activity, selectivity and stability of the catalyst in a lactic acid dehydration reaction are improved.

The present application relates to the technical field of molecular sieve preparation, and provides a surface silicon-rich binderless ZSM-5 molecular sieve catalyst and a preparation method and application thereof.The overall SiO2 / Al2O3 of the ZSM-5 molecular sieve catalyst is 86-203, the SiO2 / Al2O3 of a surface layer with a depth of 2-10 nm is 8-33% higher than the overall SiO2 / Al2O3; the acid strength measured by using Hammett indicator n-butylamine titration method is H0≤+2.27, and the content of surface acid sites is ≤0.02 mmol / g; and the ZSM-5 molecular sieve catalyst is a shaped body without amorphous phase.The surface silicon-rich binderless ZSM-5 molecular sieve catalyst provided by the present application does not contain inert adhesive, has extremely weak surface acidity, can improve the catalytic effect, and reduces the generation of by-products.In addition, the preparation method provided by the present application is simple in process and suitable for industrial production.

The invention discloses a phosphotungsten / molybdenum synergistic modified supported catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysis. The catalyst takes gamma-Al2O3 as a carrier and takes transition metal oxide and / or phosphide as an active component. The catalyst is prepared by precursor dipping, drying at 80-120 DEG C and calcining at 300-500 DEG C. The synergistic effect of phosphorus, tungsten and molybdenum is utilized, so that acid sites are newly increased, the acid strength is enhanced, and agglomeration of active components is inhibited. The catalyst provided by the invention has excellent catalytic performance, has higher reaction activity under the pressure of 0.5 Mpa, which is far lower than the pressure provided in the prior art, and has the characteristics of high target product yield, good catalyst stability, simple preparation process and low production cost.

The application discloses a kind of low ring body hydrogen-containing silicone oil and preparation method thereof, belong to the technical field of silicone material.The preparation method includes: preparation gradient acid strength core-shell solid acid catalyst;Siloxane raw materials are mixed, and the raw material mixed solution is obtained by dehydration and deoxidation pretreatment;The catalyst is loaded in fixed bed reactor, and the raw material mixed solution is continuously introduced to carry out ring-opening polymerization reaction;Reaction effluent is continuously sent into thin film evaporator, first remove unreacted monomer, then remove ring body and low boiling point substance, collect the product at the bottom of kettle, i.e.low ring body hydrogen-containing silicone oil.The application designs a kind of gradient acid strength core-shell solid acid catalyst, the core is sulfated zirconium oxide, shell is 2-3nm mesoporous SiO2.Limited effect is used in pore, and the limited ring-opening polymerization of cyclosiloxane is realized in fixed bed reactor, chain back-bite into ring is inhibited from space.Combination continuous thin film evaporation separates product in time, so that ring body content is lower than traditional scheme.

The present invention relates to the technical field of molecular sieve preparation. Provided are a binderless ZSM-5 molecular sieve catalyst having a silicon-rich surface, and a preparation method therefor and the use thereof. The overall SiO2 / Al2O3 ratio of the ZSM-5 molecular sieve catalyst is 50-500, and the surface-layer SiO2 / Al2O3 ratio of the ZSM-5 molecular sieve catalyst is 5-50% higher than the overall SiO2 / Al2O3 ratio; and the content of a surface acid site having an acid strength H0 of greater than or equal to +2.27 in the ZSM-5 molecular sieve is less than or equal to 0.04 mmol / g. The binderless ZSM-5 molecular sieve catalyst having a silicon-rich surface provided by the present invention does not contain an inert binder, has an extremely weak surface acidity, and can improve the catalytic effect and reduce the production of by-products. In addition, the preparation method provided by the present invention has a simple process and is suitable for industrial production.

The invention provides a method for preparing 5-hydroxymethylfurfural from fructose, which comprises the following steps: dissolving the fructose in a mixed solvent of an organic solvent and water, contacting with a catalyst, placing in a closed autoclave, heating, stirring and reacting in an inert atmosphere, cooling, filtering the reaction liquid to remove solid particles, and storing the 5-hydroxymethylfurfural in the filtrate; the catalyst is a polypeptide modified SAPO-34 molecular sieve catalyst. The SAPO-34 molecular sieve is grafted with polypeptide, the surface of the catalyst has good biocompatibility, adsorption of fructose molecules can be enhanced, meanwhile, the catalyst has certain hydrophobicity, water generated on active sites in situ in the reaction process is removed in time, it can be guaranteed that the acid strength of the catalyst is at a high level, and the reaction time is shortened. And meanwhile, the timely removal of water also inhibits the occurrence of side reaction rehydration, and the water quickly diffuses from the acid center to promote the reaction balance, so that the problems of low conversion rate and poor selectivity of HMF synthesis in the prior art are solved.

The invention relates to the technical field of catalyst preparation, in particular to a modified ZSM-5 molecular sieve, a preparation method thereof and a hydrocarbon cracking reaction. According to the hydrocarbon cracking reaction provided by the invention, the pore property and the acid property of the ZSM-5 molecular sieve are regulated and controlled based on the introduction of manganese species with different valence states in the ZSM-5 molecular sieve, more importantly, the acid strength and the B / L acid ratio of the ZSM-5 molecular sieve are increased while the acid density of the ZSM-5 molecular sieve is increased, and the series of modified ZSM-5 molecular sieves have different acid structures and present gradient change of the acid property, so that the performance of the ZSM-5 molecular sieve is improved. Along with the increase of the valence state of manganese in the manganese species, the acid amount of the ZSM-5 molecular sieve, especially the strong B / L acid ratio of the ZSM-5 molecular sieve, is sequentially increased, so that the product yields of ethylene and propylene can be regulated and controlled according to the change of the microstructure and the acidic structure of the catalyst. And the service life of the modified ZSM-5 molecular sieve is greatly prolonged, the hydrocarbon catalytic cracking performance is improved, and the conversion rate, the low-carbon olefin yield and the catalytic stability are remarkably improved.

This invention discloses a floating catalyst and its application in the synthesis of p-hydroxyphenylhydantoin. Copper and manganese co-doped nano-TiO2 hydrosol is loaded onto fly ash cenospheres to form a gel. The dried gel is sintered at 600-700℃ to obtain a floating catalyst with fly ash cenospheres as the support. Its chemical composition is: SO42- 2‑ / TiO2-CuO-Mn2O3 / fly ash cenospheres; its mass composition is: TiO2-CuO-Mn2O3 / 2 25%‑30%, CuO3%‑10%, Mn2O 3 6%–20%, S 0.02%–0.1%, fly ash cenospheres 50%–60%; its specific gravity is 0.6–0.90 g / cm³. 3 Specific surface area is 10-50 m² 2 / g; possesses solid superacid properties with an acid strength H0 ≤ -14.5; dissolves in acidic solvents to generate trace amounts of copper and manganese ions. The catalyst of this invention can float on the surface of aqueous solutions, solving the problem of separating solid catalysts from insoluble p-hydroxybenzylhydantoin products; it catalyzes the synthesis of p-hydroxybenzylhydantoin via two pathways, achieving a product molar yield of 68%-72%; it possesses photocatalytic functionality, allowing for the regeneration of catalysts that have lost surface catalytic activity; and it reduces the generation of organic pollutants at the source.

A solid alumina composition is prepared from an acid-treated precursor composition, the precursor composition having an alumina hydroxide (Al(OH)3), aluminum oxyhydroxide (AlO(OH)), or a mixture thereof; where the solid alumina composition includes η-alumina characterized by having an X-ray powder diffraction pattern with peaks at 19.6±0.5° 2θ and 66.8±0.5° 2θ; and where the solid alumina composition has an acidity measured by an NH3-TPD test, characterized by: (1) an acid site density ranging from about 200 to 800 μmol / g; and / or (2) an acid strength distribution of: about 20%-70% weak acid sites (such as about 30-50%, about 30-40%, or about 35-40%), about 30%-80% medium acid sites (such as about 50-70%, about 60-70%, or about 60-65%), and about 0-20% strong acid sites (such as about 0-10%, about 0-5%, or about 0-2%).

This invention relates to the field of catalysis, and discloses a bilayer gradient acidic core-shell molecular sieve catalyst, its preparation method, and its applications. The bilayer gradient acidic core-shell molecular sieve catalyst comprises a ZSM-11 core layer and a BEA shell layer covering its surface; the acid strength of the ZSM-11 core layer is 0.40–1.20 mmol / g, and its average thickness is 0.5–3 μm; the acid strength of the BEA shell layer is 0.10–0.40 mmol / g, and its average thickness is 20–300 nm. This catalyst possesses a bilayer gradient acidic core-shell structure. When applied to the catalytic synthesis of tert-butylamine from isobutylene or its precursors (alcohols / ethers), it can improve single-pass conversion while maintaining high selectivity, and significantly reduce the carbon deposition rate and bed pressure drop growth, achieving long-term stable operation.

The invention relates to an onium salt, a chemically amplified positive resist composition and a resist pattern forming method. The present invention addresses the problem of providing: an onium salt capable of generating an acid having appropriate acid strength and small diffusion; a chemically amplified positive resist composition containing the onium salt; and a method for forming a resist pattern using the resist composition. [Solution] An onium salt represented by formula (A).

This invention relates to a strength-modified block copolymer based on polylactic acid (PLA) / polyglycolic acid (PEG), its preparation method, and its application, belonging to the field of block copolymer technology. It solves the technical problem in the prior art where PLA or PEG has poor compatibility with PB / AT, making it difficult for both to fully utilize their respective advantages. The preparation method of this invention involves first uniformly mixing phthalic acid, adipic acid, an aliphatic diol, a polyol with ≥3 hydroxyl groups, and an organometallic ester, then heating and reacting the mixture under reduced pressure to remove water and excess polyol, yielding an alcohol-modified poly(terephthalic acid-adipic acid-diol ester). Then, molten dehydrated lactone monomer, a catalyst, and solvent oil are added, and the mixture is heated and reacted to obtain the strength-modified block copolymer based on PLA / PEG. This block copolymer exhibits good toughness, ductility, elongation at break, heat resistance, and excellent impact performance, and can be used as a temporary plugging agent.

This invention discloses a catalyst for the synthesis of chlorobenzene and its application, belonging to the field of catalyst technology. The catalyst is a CeO2@volcanic rock composite material supported on FeCl3 / ZnCl2. This invention uses ferric chloride and zinc chloride, two Lewis acids, as the main catalytically active components, and the CeO2@volcanic rock composite material as the support, loading the catalytically active components via an impregnation method. In the catalyst prepared by this invention, the support structure is optimized through the CeO2 and volcanic rock composite material, allowing ferric chloride and zinc chloride to be highly dispersed and anchored on the support, thus improving catalytic efficiency. The co-loading of ferric chloride and zinc chloride adjusts the acid strength of the Lewis acid, meeting the requirements for activating chlorine gas to generate chlorobenzene, while avoiding secondary substitution, significantly improving catalyst selectivity.

The invention discloses preparation and application of a CeO2-doped modified solid superacid catalyst. The preparation method comprises the following steps: dissolving zirconium oxychloride octahydrate and cerium nitrate hexahydrate by adopting a coprecipitation method, aging, filtering, washing and drying to obtain ZrO2-CeO2, dipping the ZrO2-CeO2 in an ammonium persulfate solution, and drying and roasting to obtain rare earth element doped S2O82- / ZrO2-CeO2 solid superacid; and then the Ni-S2O82-ZrO2-CeO2 solid superacid catalyst is soaked in a nickel precursor solution, and the Ni-S2O82- / ZrO2-CeO2 solid superacid catalyst is obtained. By regulating the doping amount of CeO2, the density of Zr species on the surface of the catalyst is effectively regulated, and the crystal structure, the acid strength and the stability of the catalyst are changed, so that the activity of the catalyst is improved. The Ni-S2O82- / ZrO2-CeO2 shows excellent catalytic activity in hydrocracking reaction of diphenyl ether and benzyl phenyl ether, the conversion rate reaches 100%, a monocyclic product is obtained through C-O bond hydrogenolysis, and compared with some noble metal hydrogenation catalysts, the cost is greatly reduced, and the Ni-S2O82- / ZrO2-CeO2 has a good application prospect.

The invention relates to an onium salt, a chemically amplified positive resist composition and a resist pattern forming method. The invention provides an onium salt capable of generating an acid with moderate acid strength and small diffusion, a chemically amplified positive resist composition containing the onium salt, and a resist pattern forming method using the resist composition. An onium salt represented by formula (A).

Provided is a method for preparing 5-hydroxymethylfurfural from fructose, comprising: dissolving fructose in a mixed solvent of an organic solvent and water, contacting with a catalyst, placing in a sealed autoclave, heating under an inert atmosphere, stirring, cooling after reaction, filtering the reaction liquid to remove solid particles, and 5-hydroxymethylfurfural being present in the filtrate; the catalyst being a SAPO-34 molecular sieve catalyst modified with a hydrophobic group. The present application modifies SAPO-34 molecular sieve with a modifier, and grafts a hydrophobic group on the surface of the catalyst, so that the catalyst has strong hydrophobicity, thereby the water generated in situ on the active site during the reaction can be removed in time, which not only ensures that the acid strength of the catalyst is at a relatively high level, but also inhibits the occurrence of the side reaction of rehydration, and in addition, the rapid diffusion of water from the acid center promotes the reaction equilibrium, thereby overcoming the problems of low conversion rate and poor selectivity in the synthesis of HMF in the prior art.

To provide a chemically amplified negative resist composition containing a polymer-bonded acid generator having excellent etching resistance, solubility in an organic solvent and moderate acid strength and capable of generating an acid with little diffusion, and a method for forming a resist pattern using the chemically amplified resist composition.SOLUTION: A chemically amplified negative resist composition comprising (A) a base polymer comprising a polymer comprising a recurring unit having the formula (A1) and a recurring unit having a specific structure, the polymer having a solubility in alkaline aqueous solution that decreases under the action of acid.SELECTED DRAWING: None

A solid alumina composition is prepared from an acid-treated precursor composition, the precursor composition having an alumina hydroxide (Al(OH)3), aluminum oxyhydroxide (AlO(OH)), or a mixture thereof; where the solid alumina composition includes η-alumina characterized by having an X-ray powder diffraction pattern with peaks at 19.6 ± 0.5 °2θ and 66.8 ± 0.5 °2θ; and where the solid alumina composition has an acidity measured by an NH3-TPD test, characterized by: (1) an acid site density ranging from about 200 to 800 µmol / g; and / or (2) an acid strength distribution of: about 20%-70% weak acid sites (such as about 30-50%, about 30-40%, or about 35-40%), about 30%-80% medium acid sites (such as about 50-70%, about 60-70%, or about 60-65%), and about 0-20% strong acid sites (such as about 0-10%, about 0-5%, or about 0-2%).

The invention provides a multi-acid modified long-chain isomerization catalyst and a preparation method thereof. The preparation method comprises the following steps: dipping tetragonal zirconium oxide by adopting a combination of two or three of a solution containing sulfate radicals, a solution containing phosphotungstate radicals and an ammonia water solution containing molybdate radicals, performing first drying and first roasting, and then compounding the tetragonal zirconium oxide with a ZSM-48 molecular sieve according to a mass ratio of 5: 95-95: 5 to obtain a composite carrier; impregnating the composite carrier with platinum, and performing secondary drying, secondary roasting and reduction to obtain the multi-acid modified long-chain isomerization catalyst. According to different requirements of the long-chain alkane isomerization catalyst, the acid strength, the particle size and the specific surface property of the catalyst can be adjusted by adopting different solutions and the ratio of the nanoscale tetragonal zirconium oxide to the ZSM-48.

The invention discloses a pentacyanocyclopentadiene supported catalyst and application of the pentacyanocyclopentadiene supported catalyst in bisphenol AF synthesis. The bisphenol AF synthesis steps are as follows: phenol and hexafluoroacetone trihydrate are taken as raw materials, the pentacyanocyclopentadiene supported catalyst is taken as a catalyst, and under the protection of nitrogen, heating and reaction are performed; and after the reaction is finished, cooling to room temperature, filtering and recovering the catalyst, carrying out reduced pressure distillation on filtrate to remove excessive phenol, recrystallizing residues by using an ethanol / water solution, and filtering to obtain bisphenol AF. The pentacyanocyclopentadiene supported catalyst is adopted, the acidity is enhanced through the pi-pi conjugation effect, meanwhile, the stability and recoverability of the catalyst are improved, the activity of the catalyst is high, the yield of bisphenol AF can reach 95% or above, and the purity of bisphenol AF is larger than 99.5%. Meanwhile, the reaction condition is mild, compared with a homogeneous reaction system, the reaction temperature is remarkably reduced, the equipment requirement is low, and the production cost is reduced by 20-30% compared with that of a traditional method.

The invention relates to the technical field of synthesis of methyl chloroacetate, in particular to a preparation method of methyl chloroacetate. The acidic cation exchange resin is used as a catalyst framework, and the acidic group (-SO3H) of the acidic cation exchange resin can provide acid strength equivalent to that of concentrated sulfuric acid, so that the problem of corrosivity of liquid acid is solved; carrying out acetate functionalization on the acidic cation exchange resin, capturing water molecules generated by esterification reaction, and assisting water to migrate to the hydrophilic pervaporation membrane tube; hydrophobic groups are grafted on the surface of the resin through silanization reaction, so that a catalyst skeleton is hydrophobic, water generated by reaction is effectively repelled, adsorption and retention of water at active sites are reduced, and the conversion rate of methyl chloroacetate is increased; a hydrophilic pervaporation membrane tube is combined with a vacuum pump to realize a synergistic effect with hydrophobic acetate functionalized acidic resin, so that water is removed in real time in the methyl chloroacetate synthesis process, the reaction equilibrium limitation is broken, the reaction is promoted to be carried out in a positive direction, and the conversion rate and the yield of methyl chloroacetate are improved.

The invention discloses a method for producing sustainable aviation fuel by catalytically pyrolyzing polyolefin waste plastics through a metal-hierarchical pore molecular sieve, which comprises the following steps: preparing metal and a hierarchical pore molecular sieve: firstly, adding a quantitative nano carbon material as a mesoporous template in a hydrothermal synthesis process of the molecular sieve, and then calcining the nano carbon material at high temperature to obtain the metal-hierarchical pore molecular sieve. The preparation method comprises the following steps: preparing a mesoporous molecular sieve through a hydrothermal method to obtain a hierarchical pore molecular sieve rich in mesopores, loading a certain amount of active metal on the hierarchical pore molecular sieve rich in mesopores through a wet impregnation method to obtain a bifunctional metal-hierarchical pore molecular sieve, and carrying out catalytic cracking on polyolefin through the metal-hierarchical pore molecular sieve to convert the polyolefin into SAFs. Mesopores are introduced through a template method to control pore channel spatial characteristics, a hierarchical pore molecular sieve of a micro-mesoporous composite structure is synthesized, then the acid strength and the acid density of the catalyst are regulated and controlled by loading active metal, and the bifunctional molecular sieve with matched acidity and pore structure is obtained.

This invention relates to the field of furfural production, and more particularly to catalysts, methods, and applications for the gas-phase hydrogenation of furfural to produce 2-methylfuran. The furfural hydrogenation dehydration catalyst is CuO / SiO2-La2O3-CeO2; the hydrogenation components are CuO, SiO2 support, and rare earth alkaline additives La2O3 and CeO2. Using chromium-free CuO / SiO2 as the base system, a one-step ammonia stripping method is employed without additional reagents, and activation is performed at a low temperature of 250℃, addressing issues of toxicity, cost, and stability. This patent introduces a composite of La2O3 and CeO2, regulating the acid strength and matching the active sites to achieve 100% furfural conversion and 98.1% selectivity for 2-methylfuran, ensuring long-term stability. Combining ammonia stripping with rare earth modification, the reaction is carried out at a low pressure of 0.05 MPa and 180~210℃, adaptable to existing equipment, improving product selectivity, and solving mass production and safety issues.

Provided are an onium salt monomer which has excellent etching resistance, organic solvent solubility, and appropriate acid strength, and can generate an acid with low diffusion, a base polymer comprising a polymer-bonded acid generator using the same, a chemically amplified negative resist composition using the same, and a resist pattern forming process using the chemically amplified negative resist composition. An onium salt monomer has the formula (A1):

To provide a xylylene diisocyanate composition capable of producing an optical lens having high transmittance and improved optical uniformity, and a polymerizable composition for optical use containing the same.SOLUTION: The xylylene diisocyanate (XDI) composition according to exemplary embodiments comprises a xylylene diisocyanate and an acid strength adjusting agent having a boiling point of 110 °C or more, and has an acid strength of more than 100ppm and 1, 000ppm or less based on the total weight of the xylylene diisocyanate (XDI). The polymerization reaction rate may be controlled by adjusting the acidity, and an optical lens having high transmittance and improved optical uniformity may be prepared.SELECTED DRAWING: None

The invention discloses a preparation method of a Cr-based propane dehydrogenation catalyst, which comprises the following steps: firstly, carrying out acid treatment on a catalytic cracking waste catalyst, then further independently treating a filter cake and filtrate, and mixing with an active component Cr2O3 to prepare and form. Compared with an existing dehydrogenation catalyst, the cost of the propane dehydrogenation catalyst prepared through the method is greatly reduced, inert substrate silicon oxide in the waste catalyst serves as a carrier, the acid strength and the number of acid centers of the dehydrogenation catalyst can be obviously reduced, and sintering and inactivation of active components are reduced.

This invention discloses a highly active anti-coking bifunctional hydrocracking catalyst and its preparation method, relating to the field of petroleum refining hydrocracking catalyst technology. This invention introduces silicon, an anti-coking factor, directly during the boehmite synthesis stage, embedding silicon atoms into the boehmite framework structure. After calcination, an alumina-silica composite support with specific surface chemistry is formed. The silicon element is uniformly distributed within the support framework, forming a stable Si-O-Al bonded structure after calcination. This structure effectively regulates the distribution and strength of acid centers on the support surface, reducing the number of strong acid centers and thus inhibiting the condensation and deposition of coke precursors at strong acid sites during the reaction. Simultaneously, the silicon-containing boehmite, after calcination, forms a support with a specific pore structure, providing a substrate for the uniform loading of subsequent active components and avoiding pore blockage and uneven distribution problems caused by the introduction of additives in post-processing.