117results about How to "Catalytic activity unchanged" patented technology

The invention relates to a carbon supported catalyst for ozone oxidation, and a preparation method and a use thereof. The carbon supported catalyst is composed of an active carbon supported Fe, Cu, Ni or Mg transition metal active component and a Ce, La or K cocatalyst. The catalyst has a very high catalysis activity against non-degradable organic wastewater, allows the COD removal rate to reach above 55% and the biodegradability of the wastewater to be improved to above 0.30, has the advantages of long service life, simple preparation, no secondary pollution, containing of no precious metals, and low production cost, and is very suitable for the use in the industrialized production.

The invention relates to an activated carbon catalyst used for treating refractory organic wastewater with a Fenton-like technology, and preparation and application thereof. The catalyst is prepared by using an isopyknic impregnation method with transition metals - Cu, Fe, Ni and Mn or rare earth elements as active components and formed activated carbon as a carrier; and the catalyst is mainly used for treating refractory organic wastewater, or wastewater failing to achieve standards after treated by using a biochemical method. The activated carbon catalyst provided by the invention treats the wastewater at room temperature without adjustment of the pH value of the wastewater, wherein the concentration ratio of H2O2 (mg / L) to COD (mg / L) is 0.3 to 1.5, and airspeed is 0.5 to 2.0 h<-1>. According to the invention, COD removal rate is greater than 50%; BOD5/COD indexes of the wastewater before and after treatment is significantly enhanced; biodegradability of the wastewater is improved; and the catalyst is capable of continuously operating for more than 700 hours with unchanged catalytic activity, and can be popularized in industrial application of treating industrial wastewater, specifically the refractory organic wastewater, by using the Fenton-like method.

The invention discloses a fluorination catalyst, and a preparation method and a use thereof, and belongs to the field of chemical synthesis. The precursor of the catalyst is formed by blending 40-95mass% of a trivalent chromium compound with 5-60mass% of tungstate, wherein the trivalent chromium compound can be chromic oxide or chromium hydroxide, and the tungstate can be zinc tungstate, nickel tungstate, magnesium tungstate, aluminum tungstate, silicotungstic acid, ammonium tungstate, ammonium paratungstate or ammonium metatungstate. The fluorination catalyst has the advantages of high use temperature, high catalysis activity and long service life, and can be mainly used in reactions for preparing fluorinated alkenes through gas phase catalysis of fluorination of alkenyl halides at a high temperature.

Synthesis of cyclic carbonic acid ester is carried out by taking epoxide and carbon dioxide as raw materials without organic solvent, utilizing binary catalyst with transition metal salt and bidentate ionic liquid, cycloaddition reacting at 313.15-483.15K and 0.1-5.0Mpa and synthesizing cyclic carbonic acid ester. It is simple and clean, has higher recovery rate and selectivity and can be re-used.

The invention relates to an air cleaning agent and a preparation method thereof, and belongs to the technical field of environmental protection. The air cleaning agent comprises a globular carrier and a reactive metal or reactive metal oxide, wherein the globular carrier is a flower-ball-shaped rare-earth oxide, the globular carrier is composed of sheet petals by interweaving, and the reactive metal or reactive metal oxide is attached on the petal gaps of the globular carrier and the outer-layer petals. The air cleaning agent provided by the invention has the advantages that the air cleaning effect under the normal temperature is greatly improved, the air cleaning agent has the good catalytic activity, and the air cleaning speed is greatly improved; compared with the existing catalyst, the service life of the air cleaning agent is prolonged more than ten times, the air cleaning cost is reduced, and the air cleaning agent has the good antibacterial effect and has the good killing action on the common germs and viruses; the technology of the preparation method is mature, the technology and the operation are easy to control, the distribution of a microstructure of the cleaning agent is uniform, and the productive rate is more than 80%.

Production of cyclic carbonic acid ester from high-activity catalyst is carried out by utilizing efficient binary catalyst with transition metal salt and quaternary alkylphosphonium salt halide ionic liquid, cycloaddition reacting at 313.15-483.15K and 0.1-5.0Mpa and synthesizing cyclic carbonic acid ester. It is simple and clean, has recovery rate and selectivity and can be re-used.

The invention relates to a hydroxy acid esterification method that is catalyzed by sulfonic group ion liquid. It adopts alpha-pyrrolidone positive ion that is sulfonic functionalized and ion liquid formed by inorganic or organic ion as catalyst, solvent, and dehydrating agent, the ion liquid quantity is 10-200% mol ratio of alcohol and acid, taking 0.5-8 hours reaction at 40-140 degree centigrade to gain ester. The method has the advantages of high selective, hig universality, and the ester could be automatically separated with catalyst.

The invention relates to a method for rapid, high-efficiency and selective degradation of trace benzopyrene in water. The method comprises the following steps: cutting trace-benzopyrene-containing wastewater having undergone biochemical treatment into water films with a filling material in a catalytic ozonation reactor; allowing the water films to contact with ozone or ozonized air flowing along a reverse direction and to be dissolved; and selectively degrading trace benzopyrene in the wastewater under the preferential adsorption and catalytic oxidation coupling effects of a molecular imprinting filling material. According to the invention, molecular imprinting technology and catalytic ozonation technology are combined, and trace benzopyrene in the wastewater is rapidly, highly efficiently and selectively treated; the absorption rate of ozone is more than 90% in 10 min in the catalytic ozonation reactor, so the removal rate of trace benzopyrene is more than 99%. The method can be widely applied to deep and recycling treatment of a variety of sewage and wastewater containing benzopyrene.

The invention relates to a Pd/MIL-53(Al) catalyst, preparation and application thereof. The preparation method includes: letting terephthalic acid, aluminum nitrate and deionized water in a mass ratio of 1:5:20-30 react, conducting natural cooling to room temperature, and carrying out filtering and drying to obtain MIL-53(Al); and performing roasting to obtain a high specific surface area carrier, adding palladium nitrate, and conducting equivalent-volume impregnation to obtain a mixed solution, carrying out drying, and introducing Ar/H2 (0.1-0.2L/min) to conduct reduction activation so as to obtain the Pd/MIL-53(Al) catalyst. The loading capacity of palladium is 1-8wt%; the structural formula of MIL-53(Al) is [Al(OH)(O2C-C6H4-CO2)]. The catalyst is suitable for catalytic elimination of CO in catalytic cracking catalyst regeneration device discharged flue gas and motor vehicle exhaust, and has the advantages of large specific surface area, uniform distribution of active components, high catalytic activity, high thermal stability, easy synthesis, reduction of CO catalytic conversion temperature, and low consumption of precious metals.

The invention relates to a hydroxy acid esterification method that is catalyzed by acid ion liquid. It adopts alpha-pyrrolidone positive ion and ion liquid formed by inorganic or organic ion as catalyst, solvent, and dehydrating agent, the ion liquid quantity is 10-200% mol ratio of alcohol and acid, taking 0.5-8 hours reaction at 80-140 degree centigrade to gain ester. The method has the advantages of high selective, hig universality, and the ester could be automatically separated with catalyst.

The invention relates to a preparation method for a cerium-zirconium-palladium nanopowder catalyst. The preparation method comprises the following steps: dissolving a cerium source and a zirconium source in absolute ethanol, and adding P123 template agent to obtain sol; adding palladium nitrate; keeping constant temperature of 35DEG C and constant relative humidity of 40 percent, and performing evaporation induction to form gel; drying at the temperature of 100DEG C; calcining at the temperature of 400DEG C for 4 hours at the temperature rise rate of 1DEG C per minute; and ensuring that the atomic mole ration of cerium to zirconium is 8:2, the palladium loading quantity is 0.1 to 5 weight percent, and a ratio of the cerium source and the zirconium source to the absolute ethanol to the P123 is 10mmol:20ml:1g. The catalyst is suitable for catalytic elimination of CO in flue gas discharged by a catalytic cracking catalyst regeneration device and Co in tail gas of motor vehicles and has the advantages of large specific surface area, uniform distribution of noble metal active ingredients, high catalytic activity and thermal stability, and simple synthesis method; the temperature for complete catalytic conversion of CO can be greatly reduced; the consumption of noble metals is reduced; and the cost of the catalyst is reduced.

The present invention discloses a method for synthesis of acetal/ketal in presence of acidic ionic liquid as catalyst, including: taking aldehyde/ketone and alcohol as raw materials and cyclohexane as a dehydrating agent, and performing azeotropic dehydration condensation under the catalytic action of the acidic ionic liquid at 80-120 DEG C. The acetal/ketal is obtained by aftertreatment of the reaction liquid after the reaction is completed. The acidic ionic liquid is a 3-(3-sulfonic acid)propyl benzothiazole salt acidic ionic liquid. The alcohol is C2-C4 organic alcohol. The method for synthesis of acetal/ketal catalyzed by the acidic ionic liquid has the advantages that the reaction operation is simple and convenient; separation of the catalyst from the product is easy; product purity and yield are high; and the catalyst can be reused and the catalytic activity thereof is essentially same. Accordingly, the method has broad application prospects.

The invention discloses a polysulfo-functionalized heteropolyacid ionic hybrid with multiple heteropolyacid negative ions as well as a preparation method and an application thereof. Two ionic hybrids with novel structures are built by taking aliphatic polyamine, 1,4-butanesultone, phosphotungstic acid and silicotungstic acid as starting materials and carrying out two steps of atomic economic reaction through quaternization and acidification. Positive ions of the ionic hybrid comprise four or three bissulfo-functionalized long-chain quaternary ammonium positive ions; negative ions matched with the positive ions comprise three Keggin configuration silicotungstic acid negative ions or two Keggin configuration phosphotungstic acid negative ions; the prepared ionic hybrid can be used for preparing cyclohexyl carboxylate. The ionic hybrid has high acid strength and high acid content; the ionic hybrid also shows high amphipathy, so the reaction between substrate cyclohexene and organic carboxylic acid is facilitated; the ionic hybrid has the characteristics of atom economy, mild reaction condition, no backflow water diversion, high separation probability of products and high purity.

The invention discloses a supported gold-platinum duplex metal alloy catalyst and a preparation method and application thereof. The carrier of the catalyst is silicon dioxide with the surface functionalized, the alloy of metal Au and metal Pt is loaded on the surface of the carrier, the load rate of the alloy is 0.6-2.5wt%, and the mass ratio of Au to Pt is 5:1-20:1. The gold-platinum duplex metal alloy catalyst is successfully prepared through an in-site reduction method, the catalyst is simple to prepare, and the proportion of the components is controllable. When the reaction is carried out for 40 minutes at 50 DEG C in 0.8MPa hydrogen, the productive rate of azobenzene is over 90%. The reaction process is environment-friendly and does not need such reagents seriously contaminating the environment as nitrite. Compared with the reported supported catalysts, the supported gold-platinum duplex metal alloy catalyst has higher activity; compared with precious metal catalysts such as pure platinum or palladium catalyst, the supported gold-platinum duplex metal alloy catalyst greatly improves the use ratio of precious metals, is easy to separate and recycle after reaction, is small in loss, and is more suitable for popularization and application.

The invention discloses a chromium base catalyst, and a preparation method and a use thereof, and belongs to the field of chemical synthesis. The precursor of the catalyst is composed of 90-99.9mass% of a trivalent chromium compound and 0.1-10mass% of a silicon-containing compound, wherein the trivalent chromium compound is chromic oxide or chromium hydroxide, and the silicon-containing compound can be zinc silicate, nickel silicate, magnesium silicate, aluminum silicate, zirconium silicate, barium silicate, bismuth silicate, ammonium fluorosilicate, nickel hexafluorosilicate, zinc fluorosilicate, magnesium fluorosilicate, aluminum fluorosilicate or calcium fluorosilicate The chromium base catalyst has the advantages of large specific surface area, effective inhibition of carbon formation, and long service life, is mainly used for gas phase catalysis of reactions for preparing hydrofluorocarbons or fluorinated alkenes from halogenated hydrocarbons or halogenated alkenes at a high temperature, and can also be used for gas phase catalysis of reactions for preparing hydrofluoroalkenes through hydrogen fluoride removal of hydrofluorocarbons at a high temperature.

The invention belongs to the technical field of chemical products and preparation thereof, and specifically relates to a B/L dual acidic heteropolyacid ion hybrid and a preparation method and applications thereof. The B/L dual acidic heteropolyacid ion hybrid has organic positive ions with one bisulfonic acid functionalized long chain quaternary ammonium structure and transition metal positive ions at the same time. The matched heteropolyacid negative ion is Keggin type phosphotungstic acid or silicotungstic acid negative ions. The organic positive ions with one bisulfonic acid functionalized long chain quaternary ammonium structure and the transition metal positive ions are wrapped on the surface of the heteropolyacid negative ion through electrostatic force so as to form a core-shell structure. The B/L dual acidic heteropolyacid ion hybrid can be used as a heterogeneous catalyst to prepare five acetal (ketal) perfumes: series of benzaldehyde acetal, series of cyclohexanone ketal, fructone, fraistone, and [2-(1-ethoxyethoxy)ethyl]benzene. The heterogeneous catalyst has the characteristics of high catalytic activity, good selectivity, mild conditions, large operation elasticity, easy product separation, and high purity, and the catalyst system can be circularly used.

The invention belongs to the technical field of chemical products and preparation therefore, and specifically relates to preparation and applications of a cationic poly(quaternary ammonium salt) vanadium doped heteropolyacid supramolecular system. In the supramolecular system, poly(quaternary ammonium salt) cation is a homopolymer with a linear structure, and the homopolymer is prepared through free radical polymerization of dimethyl diallyl ammonium chloride monomers. The matched heteropolyacid anion is Dawson type vanadium doped P2Mo17VO62<-7>, P2Mo16VO62<-8>, and P2Mo15VO62<-9>. The supramolecular system is a heterogeneous catalyst, industrial hydrogen peroxide with a mass percentage of 3 to 5% is used as an oxidant, and cyclic ketone is oxidized to synthesize omega-dicarboxylic acid through one-step ring opening in the absence of solvent. The omega-dicarboxylic acid preparation method has the advantages of high catalytic activity, good selectivity, wide substrate range, friendly synthesis technology environment, mild operation conditions, large elasticity, and high product purity, and the catalytic system is reusable.

The invention discloses a homogeneous catalyst. The homogeneous catalyst comprises ionic liquid, wherein the ionic liquid comprises anions and cations; both the anions and the cations contain nitrogenheterocyclic rings; the cations have structures as shown in a formula I or a formula II; and the anions have a structure as shown in a formula III, a formula IV or a formula V. The invention also discloses a heterogeneous catalyst containing the homogeneous catalyst. The invention also relates to preparation methods and application of the homogeneous catalyst and the heterogeneous catalyst. The homogeneous catalyst and the heterogeneous catalyst are used for transesterification of dimethyl carbonate and ethanol, transesterification of dimethyl carbonate and diethyl carbonate, and transesterification of methanol and diethyl carbonate to synthesize high-purity ethyl methyl carbonate products. The catalysts show extremely high reaction activity, reaction equilibrium can be achieved after a reaction is conducted for 5 min at 76-78 DEG C, and the catalysts show high catalytic activity even under the condition of near room temperature (30 DEG C). The synthesized ionic liquid can be repeatedly used for 20 times, the catalytic activity of the ionic liquid is basically unchanged, and the ionic liquid shows high stability.

The invention relates to a regeneration method of an olefin isomerization catalyst. The problems that the catalytic activity is reduced after the olefin isomerization catalyst in the prior art is regenerated, and the olefin isomerization catalyst cannot regenerate in an apparatus and regenerate for a plurality of times are mainly solved. The regeneration method orderly comprises the following steps: a) leading in a gas which is inert to reaction in a reactor after reaction is stopped, and pre-purging the catalyst for 2-10 hours at 200-400 DEG C; b) leading into an oxygen gas until the oxygen content is 0.1-1mol%, burning until the temperature stops rising; c) heating to 420-500 DEG C, increasing the flow of the oxygen gas until the content of the oxygen is 1.5-5mol%, and burning until the temperature stops rising; d) heating to 520-600 DEG C, continuing to increase the flow of the oxygen gas until the content of the oxygen is 5.5-15mol%, and burning until the temperature stops rising; e) stopping leading in the oxygen gas, and continuing to purge the gas which is inert to the reaction via heat. By adopting the regeneration method, the problem is better solved; the regeneration method can be applied to regeneration of the olefin isomerization catalyst in industrial application.

The invention discloses a method for catalytically synthesizing silanol and relates to the fields of organic chemicals and fine chemicals. The method is essentially a transition metal catalyzed organic synthesis reaction. In the method, the raw materials comprise organosilane and a clean oxidant, a used catalyst is inexpensive copper salt, the raw material is heated and stirred to react without a solvent so as to rapidly produce silanol at a moderate temperature. By adopting the method, the reaction time is 3-12 hours. The mole ratio of the organosilane to the clean oxidant is 1:(1-5), the copper salt as the catalyst accounts for 1-10mol% of the mole number of the organosilane, the raw materials react at a temperature of 50-80 DEG C, and then the silanol can be greatly yielded after simple posttreatment. The oxidant used in the method is safe and nontoxic, and the catalyst used in the method is cheap and easily available. The method disclosed by the invention is a very simple and practical method for synthesizing silanol.

The invention discloses an organic multi-pore supported catalyst as well as a synthesis method and application thereof. The synthesis method comprises the following steps: firstly, synthesizing a precursor of the organic multi-pore supported catalyst, namely (2-acrylamido-ethyl) tert-butyl carbamate-modifying core-shell polylactic acid-polystyrene bottle brush macromolecules; then carrying out a friedel-crafts hyper-crosslinking reaction on the precursor by taking dimethoxymethane as a crosslinking agent and anhydrous ferric chloride as a catalyst; then carrying out hydrolysis to remove cores and deprotection to synthesize the organic multi-pore supported catalyst, namely the organic multi-pore supported catalyst loaded with organic amine. The invention further provides the application of the organic multi-pore supported catalyst loaded with organic amine in a catalytic Knoevenagel condensation reaction.

The invention discloses a method for preparing an olefin compound based on a catalyst obtained by compounding carbon tubes and transition metals. The method comprises the following steps: preheating and vaporizing an alkane compound, mixing the compound with carrier gas, and carrying out a dehydrogenation reaction in a reactor under the action of a catalyst; and collecting the olefin compound after condensation, wherein the catalyst contains 5-30wt% of transition metals/transition metal oxides and 70-95wt% of carbon tubes. The method is used for preparing aliphatic olefin compounds and aromatic olefin compounds, the catalyst compounded based on the carbon tubes and transition metal elements/transition metal oxides is stable to water, air and heat, the catalytic activity is invariable after the continuous experiment of over 150 hours, continuous operation can be realized, activation is not needed, and the catalyst is economic and convenient. According to the method disclosed by the invention, when the catalyst is applied to ethylbenzene gaseous phase direct dehydrogenation so as to prepare styrene, the conversion rate of the alkane compound is not less than10 percent, and the selectivity of the olefin compound can be more than or equal to 97 percent.

The invention discloses preparation of a hydroxyl/sulfo bifunctional vanadium-doped heteropolyacid ionic hybrid and application thereof. In the structure of the hydroxyl/sulfo bifunctional vanadium-doped heteropolyacid ionic hybrid, a long-chain quaternary ammonium structure cation simultaneously has hydroxyl/sulfo bifunctional groups, and the matched heteropolyacid anions are respectively [P2Mo17VO62]-7, [P2Mo16V2O62]-8 and [P2Mo15V3O62]-9; and 7 or 8 or 9 bifunctional organic cations are coated on the surface of nano-scale polyoxoanions due to electrostatic interaction so as to present a core-shell structure. The prepared ionic hybrid serving as a heterogeneous catalyst is applied to a phenol cleaning preparation method. The phenol preparation method provided by the invention has the characteristics of being high in reaction activity of the catalytic system, excellent in selectivity, mild in reaction conditions, high in operating flexibility, easily separable in products, high in purity, recyclable in catalytic system and the like.

The invention discloses a method for catalyzing cross coupling reaction of Suzuki with palladium magnesium aluminum class layered double hydroxides (LDHs). The method includes that aryl halide and arylboronic acid are taken as raw materials, PdMgAl-LDHs are taken as a catalyst, and biphenyl compounds are reacted and generated under the condition that the phase transfer catalyst, alkali, additives and solvents exist. The catalyst is featured in that palladium is directly bonded on the slabs of the layered double hydroxides with even distribution and good stability. With the method, cross coupling reaction of Suzuki can be efficiently catalyzed, the catalyst is simple in preparation, easy to be regenerated and reusable, and pollution of the palladium on terminal product and environment is effectively reduced.