877 results about "Synergistic catalysis" patented technology

The invention relates to a catalyst for ethylene oxide ring-opening polymerization and a preparation method thereof, and belongs to the technical field of high polymer material synthesis, and the catalyst is a composite structure based on a silicon dioxide nanoparticle loaded bimetal organic complex; a modified nitrogen-containing polydentate ligand is prepared by adopting a special method, is coordinated with metal ions through covalent bonds and is loaded on silicon dioxide nanoparticles; by utilizing the high dispersity and stability of the silicon dioxide nanoparticles and the synergistic catalytic effect of the bimetal organic complex, the catalytic effect is effectively improved, the polymerization process is accelerated, the polymerization stability is enhanced, the polymerization molecular weight is improved, and the distribution is narrow.

The invention discloses a high-entropy oxide for synergic nitrogen removal and catalysis as well as a preparation method and application thereof, and belongs to the technical field of material preparation, the high-entropy oxide is a single solid solution phase formed by five or more metal elements of Fe, Co, Ni, Cu, Mn, Ti and Ce and an oxygen element, the configuration entropy of the high-entropy oxide is greater than or equal to 1.5 R, R is a gas constant, and R is an oxygen constant. The mole fraction of each metal element is 0.1-0.3, and the sum of the mole fractions of the metal elements is 1. According to the high-entropy oxide with the synergistic nitrogen removal and catalysis effects and the preparation method and application thereof, a synergistic catalysis system is constructed through the high-entropy oxide and silicon carbide, and the high-entropy oxide has the multiple advantages of being high in nitrogen removal efficiency, high in stability, simple in process, environmentally friendly and wide in application range; the removal rate of total nitrogen and key nitrogen pollutants can reach 90% or above in the seawater high-salt environment, and the environment-friendly emission requirement is met.

The invention provides a preparation method and application of a cobalt-based catalyst, and relates to the technical field of chemical production. The cobalt-based catalyst includes cobalt, a transition metal element, and a Group IIIA element other than aluminum. Transition metal elements and IIIA group elements except aluminum are introduced into the cobalt-based catalyst, and the electronic structure and active sites of the cobalt-based catalyst are changed. The method not only can cooperate with catalytic reaction and promote the formation and conversion of intermediates, but also can enhance the adsorption and activation capability on substrates, reduce the reaction activation energy and guide the reaction to be carried out along a specific path. Finally, the effect of efficiently harvesting the 2-methyl pentamethylene diamine and the 3-methylpiperidine at the same time is achieved.

The invention discloses a composite microbial enzyme preparation and a preparation method thereof, and belongs to the technical field of bioplastic degradation. The enzyme preparation is synergistically constructed through a temperature-sensitive MOFs / Schiff base network composite carrier and black phosphorus quantum dots, FeO (at) ZIF-8 is taken as a core, and PNIPAM is grafted on the surface to form temperature-responsive MOFs; constructing a three-dimensional network carrier through Schiff base crosslinking of the CMC and the CNF; the complex enzyme is loaded on MOFs pore channels and then is embedded in a carrier network together with the black phosphorus quantum dots. The temperature-sensitive MOFs open pore channels to release enzyme when the compost is heated, and the Schiff base network dissociates secondary released enzyme under an acidic condition; the black phosphorus quantum dots promote enzyme activity and strengthen carrier response through a photothermal effect; the compound enzyme contains cutinase, alkaline lipase, neutral lipase, alpha-amylase, saccharifying enzyme, cellulase, laccase and protease, and can synergistically degrade PLA, PBAT and starch-based plastic. According to the invention, dual environment response controlled release, photo-thermal synergistic catalysis and synergistic degradation of the enzyme preparation are realized, and the plastic degradation period is shortened under the composting condition.

The invention provides a cerium oxide photo-thermal synergistic catalytic material loaded with a metal promoter as well as a preparation method and application of the cerium oxide photo-thermal synergistic catalytic material. The cerium oxide photo-thermal synergistic catalytic material loaded with the metal promoter comprises a cerium oxide nanocrystal and the metal promoter loaded on the surface of the cerium oxide nanocrystal, the exposed crystal face of the cerium oxide nanocrystal comprises a {111} crystal face, and the area of the {111} crystal face accounts for more than 50% of the total area of the outer surface of the crystal face; the mass fraction of the metal cocatalyst is 0.1-2wt% of the mass of the cerium oxide. The catalytic material provided by the invention takes cerium oxide with a {111} crystal face as an exposed special crystal face as a carrier, photons can be captured and charges can be separated more efficiently, and phonons further promote deep trap state charge release. Meanwhile, the metal additive is added and cooperates with cerium oxide with exposed special crystal faces for catalysis, so that the catalytic effect is remarkably improved, and efficient catalytic combustion of methane is achieved under the mild condition.

The invention discloses a method for degrading polystyrene (PS) plastic and upgrading and recycling the PS plastic into benzoic acid based on nano MnO2 photocatalytic ozonation, and belongs to the technical field of solid waste recycling. The method comprises the following steps: firstly, mixing PS plastic fragments with nano MnO2 and an organic solvent, then simultaneously introducing ozone into a reaction system at normal temperature and normal pressure, and irradiating with light. Through synergistic catalysis of light and ozone, molecular chains of the PS plastic can be efficiently and selectively broken and oxidized, and finally the PS plastic is directionally converted into benzoic acid with high additional value. After the reaction is finished, a benzoic acid product can be obtained through simple separation, concentration and purification steps. The method provided by the invention realizes high-valued recycling of the waste PS plastic under mild conditions, solves the problems of high energy consumption, complex products, easy generation of secondary pollution and the like in a traditional treatment method, and has the outstanding advantages of green process, efficient reaction, high product value and the like.

The invention provides a method for promoting acquisition of clean fuel by light / sound concerted catalytic degradation of waste plastics and upgrading and conversion thereof, which comprises the following steps: uniformly mixing g-C3N4, cadmium acetate and thioacetamide according to a predetermined proportion, pouring into a reaction kettle, placing in a high-temperature oven for a predetermined time, centrifuging, cleaning and drying to obtain a catalyst, the method comprises the following steps: loading a catalyst on the surface of aerogel, hydrogel or non-woven fabric to obtain an MTSJA-loaded catalyst, treating waste plastic with NaOH, adding the MTSJA-loaded catalyst, stirring under irradiation of a xenon lamp, starting ultrasound for reaction, and carrying out light / sound synergistic catalytic degradation on the waste plastic. According to the method, energy consumption is not needed, toxic and harmful gas is not generated, the purposes of energy conservation and environmental protection can be achieved, meanwhile, carbon dioxide in water can be catalytically reduced to generate clean energy such as methane in the process of degrading the waste plastic, and further obtaining of the energy is promoted.

The invention discloses an immunosensor for detecting cytokine interferon gamma through electrochemiluminescence as well as a preparation method and application of the immunosensor. The immunosensor comprises a three-electrode system consisting of an immunoelectrode, a reference electrode and a counter electrode, the immunoelectrode is a VMSF modified electrode confined to cerium dioxide nano enzyme and platinum nano particles, and is obtained by covalently immobilizing an IFN-gamma antibody and closing a non-specific site; when the immunosensor is used for detection, a solution containing luminol is used as an electrolyte. The CeO2 and the PtNPs which are confined in the nano channel show a remarkable synergistic catalysis effect. Compared with direct modification on a plate electrode, CeO2-PtNPs has higher catalytic activity and stability. The sensor provided by the invention is used for INF-gamma detection, has the advantages of high sensitivity, low detection limit and wide detection range, does not need complex pretreatment and separation processes during detection, reduces the detection cost, is simple to operate, and is suitable for large-scale application.

The invention discloses a metal supported activated carbon catalyst for efficiently preparing aquacide dichloride and application of the metal supported activated carbon catalyst. The catalyst is prepared by taking activated carbon as a carrier, loading Lewis acid active components such as aluminum ions, zinc ions, iron ions, copper ions and the like through an impregnation method, and carrying out vacuum pyrolysis activation treatment at 300-600 DEG C. The catalyst synergistically catalyzes a nucleophilic substitution reaction of a pyridine derivative and alkyl halide in an aprotic polar solvent such as acetonitrile or nitrobenzene, and synthesis of diquat dichloride can be realized under the conditions that the temperature is 100-180 DEG C and the pressure is 1-3 MPa. In a reaction system, the mass ratio of the pyridine derivative to the catalyst to the solvent is 1: (0.01-0.05): (5-8), and real-time monitoring and regulation are performed through an online infrared spectrum, a liquid chromatograph and a gas chromatograph-mass spectrometer. The purity of the product is more than 99% after the product is subjected to filtration, recrystallization with an ethanol-water mixed solvent and vacuum drying. The catalyst provided by the invention has the characteristics of high activity, strong stability and recoverability, obviously improves the atom economy of the reaction, simplifies the production process, reduces the energy consumption and pollution, and is suitable for large-scale industrial production.

The invention discloses a two-dimensional metal oxide composite reduced graphene oxide burning rate catalyst, which is prepared by the following steps: uniformly grinding glucose, ammonium nitrate and transition metal nitrate, calcining at high temperature to generate a two-dimensional metal oxide nanosheet, mixing the two-dimensional metal oxide nanosheet with surfactant modified reduced graphene oxide powder, and sintering at high temperature to obtain the two-dimensional metal oxide composite reduced graphene oxide burning rate catalyst. And transferring into a high-pressure hydrothermal kettle for solvothermal reaction, so that the reduced graphene oxide and the two-dimensional metal oxide nanosheet are compounded to form the composite burning rate catalyst with a 2D-2D structure. Two two-dimensional materials are compounded through a solvothermal method, the defects of accumulation of reduced graphene oxide and aggregation of the two-dimensional metal oxide due to high surface energy are effectively avoided, meanwhile, the high conductivity of the reduced graphene oxide is utilized, the synergistic catalysis effect of the metal oxide and the carbon material is enhanced, and the performance of the composite material is improved. The composite material has a good catalytic effect on the thermal decomposition process of ammonium perchlorate.

The invention discloses a Ni-based bimetallic multifunctional catalyst and a preparation method and application thereof, and belongs to the technical field of catalysis. The general formula of the Ni-based bimetallic multifunctional catalyst is Ni-M-Al2O3, M in the formula represents one or three of Cr, Mn, Fe, Co or Cu, and the preparation method of the Ni-based bimetallic multifunctional catalyst comprises the following steps: firstly synthesizing a Ni-M-Al hydrotalcite precursor oxide with a layered porous structure, and then preparing the Ni-M bimetallic multifunctional catalyst through an efficient in-situ desolvation method. According to the method disclosed by the invention, the multi-functionality and multi-center concerted catalysis of the catalyst, including an alkaline site, an acid site and a bimetallic hydrogenation active site, is fully utilized, and the target product dimethyl succinate is prepared with high selectivity under a mild condition through the concerted catalysis of bimetallic alkali sites and the interaction of strong metal carriers.

The invention discloses a gas-sensitive material based on double noble metal doped holmium iron oxide and application of the gas-sensitive material to detection of hydrogen sulfide in a sulfur-containing ore body exploration environment, and relates to the technical field of gas-sensitive materials. HoFeO3 is used as a substrate material, and two elements of Au and Pt are used for doping modification of the HoFeO3 to prepare the gas sensitive material based on double noble metal doped holmium iron oxide. Au and Pt are combined to perform doping modification on HoFeO3, a synergistic effect is achieved on improving the temperature stability of the gas-sensitive material, the sensitivity of the gas-sensitive material in a high-humidity environment can be improved, in addition, due to the synergistic catalysis effect of Au and Pt, an energy barrier of H2S adsorption reaction can be remarkably reduced, surface electron transfer and reaction activity are promoted, and the sensitivity of the gas-sensitive material in a high-humidity environment is improved. Therefore, the working temperature is reduced, the response value is improved, and the method is suitable for detecting hydrogen sulfide gas in a sulfur ore body exploration environment.

The invention discloses a synthesis process of vitamin C ethyl ether, and belongs to the technical field of vitamin C derivative synthesis. The process comprises the following steps: taking L-ascorbic acid as a raw material, adding acetone, anhydrous cupric sulfate and acetyl chloride, and reacting for 1-2 hours at 38-40 DEG C under the protection of nitrogen to obtain a vitamin C protector; adding alkali, water, an alkylating reagent and absolute ethyl alcohol into the reaction product, reacting for 3 hours at 75-78 DEG C under the protection of nitrogen, and performing reduced pressure distillation to obtain a vitamin C protector etherate; and finally, hydrolyzing by using cationic resin, removing a protecting group, and recrystallizing by using ethyl acetate to obtain the vitamin C ethyl ether. Through the synergistic catalysis of anhydrous cupric sulfate and acetyl chloride, the reaction time is remarkably shortened, and the product purity and yield are improved. Through detection, the product purity is more than 99.5%, the total yield can reach more than 80%, and an efficient and economical method is provided for industrial production of vitamin C ethyl ether.

The invention discloses a phase transfer catalyst of metal ion complexing crown ether for efficiently preparing aquacide dichloride and application of the phase transfer catalyst. The catalyst is prepared by taking crown ethers as 18-crown-6 and dicyclohexyl-18-crown-6 ether and complex ions as lewis acid active components such as potassium ions, lithium ions, cobalt ions, copper ions and the like through a direct chemical method. The catalyst synergistically catalyzes a nucleophilic substitution reaction of a pyridine derivative and alkyl halide in an aprotic polar solvent such as acetonitrile or nitrobenzene, and synthesis of diquat dichloride can be realized under the conditions of 60-140 DEG C, normal pressure and no oxygen. The mass ratio of the pyridine derivative to the catalyst to the solvent in a reaction system is 1: (0.001-0.05): (5-8), and real-time monitoring and regulation are performed through an online infrared spectrum, a liquid chromatograph and a gas chromatograph-mass spectrometer. The purity of the product is more than 99% after the product is subjected to filtration, recrystallization with an ethanol-water mixed solvent and vacuum drying. The catalyst provided by the invention has the characteristics of high activity, strong stability and recoverability, obviously improves the atom economy of the reaction, simplifies the production process, reduces the energy consumption and pollution, and is suitable for large-scale industrial production.

The invention provides a ceramic fiber tube and a preparation method thereof, the ceramic fiber tube is provided with a tube body, the tube body is provided with multiple fiber filter paper layers formed by overlapping fiber cotton layers, and the tube body comprises a denitration area and a CO removal area which are arranged along the wall thickness direction; the denitration area comprises a fiber filter paper layers, the CO removal area comprises b fiber filter paper layers, and a + b is greater than or equal to 100; the pipe body is overlapped between the adjacent fiber filter paper layers to form nanoscale pores, and the pore diameter of the nanoscale pores is 10-50nm; and the CO removal area at least further comprises a CO catalyst which is loaded in the pores and on the surface of the fiber cotton in a nano-scale manner. Different active components are loaded on the carrier structure according to functional areas, and the number of layers of the fiber filter paper layers and nanoscale pores are configured, so that the three-in-one design of partition loading, gradient pores and collaborative catalysis is realized, the technical bottleneck of collaborative purification of multiple pollutants in complex flue gas is overcome, and the application prospect is wide. And high efficiency, economical efficiency and long service life are achieved.

The invention discloses a Ni-based'bimetallic-alkali-acid 'multifunctional hydrotalcite catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalytic synthesis of fine chemicals. According to the invention, a Ni-N-MO-Al hydrotalcite precursor oxide (a main metal is Ni, a second metal N is one of Cr, Mn, Fe, Co or Cu, and M in an alkali metal oxide MO is one of Mg, Ca, Sr, Ba, Cd or Zn) with a layered porous structure is synthesized, and then the Ni-based'bimetal-alkali-acid 'multifunctional hydrotalcite catalyst is prepared through an efficient in-situ desolvation method. According to the method, the multi-center synergistic effect of the catalyst, including Ni-N bimetallic hydrogenation active sites, MO alkaline sites and Lewis acid sites of an Al framework, is fully utilized, and the target product dimethyl succinate is prepared with high selectivity under mild conditions through bimetallic-alkali-acid multi-site synergistic catalysis and strong metal carrier interaction.

The invention discloses a preparation method of a NiMnCeOx nano hollow sphere catalyst and application of the NiMnCeOx nano hollow sphere catalyst in photothermal synthesis of biomass-based synthesis gas, a Ni / MnxCe1-xO2 catalyst with a nano hollow sphere structure is prepared by utilizing a hydrothermal technology, and the loading amount of active metal Ni is 5%-15%. The catalyst shows relatively high catalytic activity in a photo-thermal synergistic CO2 reduction reaction, and the dispersity of the active metal Ni can be effectively improved and the sintering of the catalyst in the reaction process can be inhibited through strong interaction (SMSI) between the transition metal Ni and the carrier and a confinement effect of specific morphology. The preparation method of the catalyst has the advantages of simple process, low cost and the like, and accords with the concept of green sustainable development; and the method shows higher application potential in the field of synthesizing high-added-value chemicals from greenhouse gas CO2 through photo-thermal concerted catalysis, and has great significance in energy conservation and environmental protection.

The invention provides a preparation method and application of an Au-loaded bismuth-based semiconductor photothermal catalyst, and relates to the technical field of catalysts, a Bi-based precursor is prepared, and the Bi-based precursor is any one of BiVO4, Bi2WO6, BiOCl, BiOBr, BiOI, Bi2MoO6 and Bi2O3; loading Au onto the Bi-based precursor by adopting a homogeneous reduction method, a deposition-precipitation method, a photodeposition method or an Au sputtering method to obtain an Au-loaded bismuth-based catalytic material; and loading the Au-loaded bismuth-based catalytic material on 0.1-10mm quartz microspheres by adopting an initial wet impregnation method, and carrying out vacuum drying on the quartz microspheres to obtain the Au-loaded bismuth-based semiconductor photo-thermal catalyst for the reaction of preparing ethane by photo-thermal synergistic catalysis of methane coupling.

The invention discloses a method for detecting glucose on the basis of cascade catalysis of cerium dioxide / gold nano cluster-Prussian blue nano enzyme (AuNCs-CeO-HMPB). The material is prepared by compounding cerium dioxide (CeO) with similar glucose oxidase activity and hollow Prussian blue nanoparticles (AuNCs-HMPB) modified by gold nanoclusters with similar peroxidase activity through a hydrothermal assembly method. In the presence of glucose, CeO catalyzes oxidation of glucose to generate gluconic acid and H2O2, then AuNCs-HMPB synergistically catalyzes decomposition of newly generated H2O2 to generate high active oxygen species, further a colorless 3, 3 ', 5, 5'-tetramethyl benzidine (TMB) color developing agent is oxidized to generate obvious color change, and based on the cascade catalytic reaction, the enzyme-free glucose colorimetric sensor is successfully constructed. The sensor shows excellent detection performance on glucose under optimized conditions (pH = 4.0, 50 DEG C), the linear detection range is 10.00-90.00 [mu] mol / L, and the detection limit is 2.1 [mu] mol / L (S / N = 3).

The invention discloses a microwave catalysis and plasma combined waste gas treatment system and method. The system is formed by connecting a pretreatment module, a pretreatment cavity module, a main catalysis cavity module, a tail end purification module and an intelligent control module in series. The pretreatment module adopts two-stage condensation and multi-stage dust removal and is provided with a humidity particle return valve; the pretreatment cavity completes low-temperature oxidation under the cooperation of multi-frequency microwaves and a catalyst; the main catalytic cavity integrates a pulse corona-enhanced plasma discharge structure and a 2.45 / 5.80 GHz double-frequency microwave source, and cooperates with a catalyst to deeply crack VOCs. The tail end module achieves waste heat recovery and fine purification through double heat exchangers and double activated carbon adsorption, and a terminal monitors emission online through Fourier infrared. And the intelligent control module predicts and adjusts the microwave power, the discharge frequency and the valve position in real time based on a long short-term memory (LSTM) network algorithm, namely LSTM, so that the system keeps high-efficiency, low-energy-consumption and stable operation under the conditions of high humidity and multi-component VOCs (Volatile Organic Compounds).

The invention provides a preparation method of a carbon-supported nano zero-valent iron catalytic material based on multi-metal catalysis, and relates to the technical field of catalytic materials. The preparation method of the carbon-supported nano zero-valent iron catalytic material based on multi-metal catalysis comprises the following steps: step 1, preparing raw materials; step 2, pretreating a carbon carrier; step 3, preparing a multi-metal precursor solution; step 4, carrying out impregnation reaction; a synergistic catalytic system is formed by introducing various metals, so that the catalytic activity of the catalytic material is remarkably improved. Main catalytic metals such as iron, cobalt and nickel interact with auxiliary metals such as molybdenum and tungsten, so that the performance of the material is enhanced. The composite of the carbon nanofibers and the porous graphite is used as the carbon carrier, the advantages of the carbon nanofibers and the porous graphite are combined, a larger specific surface area and a more stable structure are provided for metal loading, and the stability of the catalytic material is improved.

The present invention discloses a titanium dioxide / manganese dioxide / carbon composite catalyst supported on a macroscopic carrier, a preparation method thereof and an application. The preparation process is as follows: titanium dioxide is added to deionized water, stirred, potassium permanganate is added, and stirring is continued; a carbon source is added, after stirring evenly, a macroscopic carrier is added, ultrasonic mixing is carried out, and reaction is carried out under water bath conditions. After the reaction is completed, it is cooled and dried to obtain the product. Compared with the existing formaldehyde removal materials, through the mutual synergistic effect among the components of the composite catalyst in the present invention, that is, the photo-thermal synergistic catalytic oxidation under light conditions and the adsorption / catalytic oxidation under dark conditions act together to mineralize formaldehyde into environmentally harmless water and carbon dioxide. In addition, the preparation method of the present invention has a simple operation process and low raw material prices. Combining the support on a macroscopic carrier and the synergistic effect among the composite catalysts, it has the characteristics of a wide range of applicable scenarios, convenient subsequent recovery, and all-weather formaldehyde removal, and has broad application prospects.

The present invention provides a microplastic degradation device based on acoustic-photothermal synergistic catalysis, which first promotes a Fenton-like activation oxidation reaction between a water sample to be tested and an activated oxidant by acoustic wave catalysis through an acoustic mold component, and simultaneously promotes the above-mentioned Fenton-like activation oxidation reaction by photothermal catalysis after being irradiated with light through a photothermal catalytic layer. Compared with the existing microplastic degradation technology, the microplastic degradation device based on acoustic-photothermal synergistic catalysis can simultaneously utilize more catalytic reaction modes and have a synergistic effect, and can achieve degradation treatment with lower energy consumption and shorter degradation time in the field of microplastic degradation, thereby effectively improving the degradation efficiency of microplastics in the water sample to be tested.

The invention discloses a method for degrading and recycling waste plastics based on a deep eutectic solvent, and belongs to the technical field of waste plastic resource recycling. The method comprises the following steps: treating waste PET plastic by using a decolorizing agent, carrying out catalytic alcoholysis on the waste PET plastic and ethylene glycol at 180-200 DEG C under normal pressure by using a choline chloride / ethylene glycol / zinc acetate ternary eutectic solvent as a catalyst and a solvent to generate a bis (2-hydroxyethyl) terephthalate monomer, and synthesizing the waterborne polyurethane with isophorone diisocyanate. The preparation method comprises the following steps: mixing waterborne polyurethane with an acrylamide-acrylic acid copolymer and a ternary eutectic solvent, and carrying out UV photopolymerization to prepare the dual-network eutectic gel. The method has the characteristics that the ternary eutectic solvent and Zn < 2 + > synergistically catalyze the degradation of the waste PET to obtain the bis (2-hydroxyethyl) terephthalate monomer with the purity of more than or equal to 96.1% and the yield of more than or equal to 95.3%, and then the eutectic gel with the tensile strength of more than or equal to 1.5 MPa is prepared through photopolymerization, and the temperature is reduced by 60-80 DEG C compared with that of the traditional process. The method effectively solves the problems of high energy consumption, more waste acid and low yield of the traditional waste PET plastic recovery technology.

The invention relates to the technical field of transition metal catalysts, in particular to a transition metal / alkali metal bimetallic monatomic catalyst for catalyzing acetylene hydrochlorination reaction and a preparation method and application of the transition metal / alkali metal bimetallic monatomic catalyst. After dipping in an alkali metal nitrate solution, the alkali metal is firstly converted into a metal oxide through two-stage calcination, and then the metal oxide is converted into a super-strong alkali metal monatomic material containing a high defect site. And dipping the alkali metal monatomic catalyst in a transition metal salt solution to obtain the transition metal / alkali metal bimetallic monatomic catalyst. Transition metal monatomic serves as a main active center, alkali metal monatomic serves as a super alkali auxiliary, the microenvironment of active sites is greatly improved, the adsorption capacity of the transition metal sites to reactants is enhanced, meanwhile, carbon deposition side reaction can be inhibited, and synergistic catalysis between transition metal and alkali metal monatomic is achieved; the catalyst shows high catalytic activity and stability on acetylene hydrochlorination reaction.

The invention provides a catalyst for synthesizing N-methylaniline and a preparation method thereof, the catalyst comprises an active component, a carrier and an auxiliary agent, the active component comprises oxygen-containing compounds of copper, zinc and chromium, the carrier is gamma-alumina subjected to surface hydroxylation treatment, and the auxiliary agent is a cerium-molybdenum bimetallic alloy. The preparation method comprises the following steps: loading the active component on the hydroxylation carrier through ultrasonic impregnation, drying, further loading the cerium-molybdenum auxiliary agent, and carrying out reduction alloying and roasting activation to form the composite catalyst. The catalyst is a regular cylinder, has the diameter of 4-6mm and the length of 4-6mm, has an optimized pore structure and surface properties, and is suitable for methylation reaction of aniline and methanol. According to the method, the dispersity of active components is improved through modified chromic oxide, the mass transfer efficiency is enhanced through a hydroxylation carrier, the synergistic catalysis effect of cerium-molybdenum alloy is combined, the reaction activity and selectivity are remarkably improved, meanwhile, side reactions are inhibited, the stability is enhanced, and the method can be widely applied to industrial production of N-methylaniline.

The invention provides a low-temperature concerted catalytic denitration device which comprises a lower shell and an upper shell, a cavity is formed in the lower shell, an infiltration assembly and a stirring assembly are arranged in the cavity, and a circulation assembly is arranged on the upper surface of the upper shell. By designing the infiltration assembly, nitrogen oxide gas can be introduced into absorption liquid to be in full contact with the absorption liquid, so that the contact area of the nitrogen oxide gas and the solution is increased, and the chemical reaction efficiency is greatly improved; according to the invention, nitrogen oxide gas can be broken into finer bubbles from the longitudinal direction and the transverse direction when the nitrogen oxide gas is introduced into the absorption liquid, and the bubbles slowly float up through the guide plate in the process of rotating along with vortex and floating up, so that the floating-up time of the bubbles in the solution can be fully prolonged, the reaction time is prolonged, the denitration rate is further improved, and the denitration efficiency is improved. Meanwhile, the backflow assembly is used for detecting gas at the exhaust port, and unqualified gas obtained after reaction is subjected to secondary circulation.

The invention belongs to the technical field of petroleum processing, and particularly relates to a preparation method and application of a catalyst. The catalyst comprises a metal active component and a molecular sieve, a metal complex is added in situ in the synthesis process of the molecular sieve, anchoring of metal in a molecular sieve cage is realized by using a confinement effect in the molecular sieve cage, sub-nanometer approaching of a metal site and an acid site is realized, and the synergistic effect of the metal site and the acid site is improved; the catalytic cracking catalyst is used for synergistic catalytic cracking of biomass pyrolytic oil and petroleum distillate oil. The high-activity confinement type catalyst is synthesized, the synthesis time of the catalyst is greatly shortened by adding the metal complex while the HY molecular sieve is synthesized, the original crystal structure is kept, metal dispersion is promoted, and the catalytic reaction activity is improved. The catalyst provided by the invention is simple and controllable in active component loading capacity and size, and can be applied to the co-catalytic cracking process of biomass pyrolytic oil and / or a model compound thereof and petroleum distillate oil and / or VGO.

The invention discloses a preparation method and application of a catalyst based on pyridine ionic liquid, and belongs to the technical field of catalyst preparation. According to the invention, a hydrolysis reaction of a silane coupling agent is utilized to prepare a silicon oxide nanotube containing a pyridine unit, and then a quaternization reaction is carried out to obtain the catalyst based on the pyridine ionic liquid. The catalyst has a high specific surface area and a rich pore channel structure, exposure of active sites and contact of the active sites and reactants are facilitated, and the catalytic rate is increased. Meanwhile, the silicon oxide nanotube contains hydroxyl, and can cooperate with a pyridine ionic liquid site to catalyze a carbon dioxide cycloaddition reaction. The obtained catalyst can catalyze the reaction of carbon dioxide and an epoxy compound to prepare cyclic carbonate under solvent-free and metal-free conditions, and the catalyst is easy to recover and simple in product purification, and has a good application prospect.

The invention relates to preparation of a molybdenum disulfide coated barium titanate nano material and application of the molybdenum disulfide coated barium titanate nano material in the field of piezoelectric light concerted catalysis. Compared with pure-phase MoS2 and BaTiO3, the molybdenum disulfide coated barium titanate nano material synthesized by a hydrothermal method shows a remarkably enhanced piezoelectric optical effect. Under the synergistic effect of ultrasound and light, the molybdenum disulfide coated barium titanate nano material can realize efficient degradation of rhodamine B and remarkable improvement of hydrogen production efficiency, the degradation rate constants are 2.3 and 14.4 times of those of pure-phase MoS2 and BaTiO3 respectively, and the hydrogen production efficiency is 2.3 and 1.9 times of those of pure-phase MoS2 and BaTiO3 respectively. The piezoelectric catalyst BaTiO3 and the photocatalyst MoS2 can be well combined to form a heterojunction, so that the electron-hole separation efficiency is improved. The invention discloses a method for improving the production of hydrogen by degrading rhodamine B and decomposing water by the material by constructing the heterojunction, and the method is simple in process flow, high in operability and wide in application prospect.