38results about How to "Catalytic activity does not decrease" patented technology

The invention discloses a graphene / molecular sieve composite catalyst and a preparation method thereof. The composite catalyst comprises, by weight, 5-40% of graphene and 60-95% of molecular sieve. The composite material has a quasi-two-dimensional lamellar structure, the ratio of the area of a single lamella to the thickness of the single lamella is more than 100 micrometers, the molecular sieve is evenly loaded on the surface of the graphene, and mesopore diameter is 2-30 nanometers. The preparation method includes: mixing the graphene, a silicon source, an aluminum source and a surfactant, separating out a graphene-containing part, crystalizing, purifying, and removing the surfactant. The graphene / molecular sieve composite catalyst has the advantages that the composite catalyst serving as a solid acid catalyst has enhanced catalytic activity, product yield and reusability can be evidently increased while the catalytic activity is not lowered when the catalyst is used in CBG and EHB reaction, and accordingly the catalyst is promising in application prospect.

The invention belongs to the technical field of organic silicon synthesis, and particularly relates to a method for preparing polyether-modified silicone oil in presence of an MOFs (metal-organic frameworks) supported catalyst. The preparation method includes the steps: performing hydrosilylation reaction of hydrogen containing silicone oil and allyl polyether without solvents in presence of the MOFs supported catalyst; filtering and separating the catalyst after reaction to obtain the polyether-modified silicone oil. The MOFs supported catalyst has a structural formula indicated in a formula (I), M refers to platinum, rhodium, palladium or ruthenium, and R1 and R2 are same or different H or Br. The hydrosilylation reaction of the hydrogen containing silicone oil and the allyl polyether is catalyzed by the MOFs supported catalyst which can be recycled by a simple method, and the quality of the polyether-modified silicone oil and the use ratio of precious metals can be effectively improved.

The invention relates to 1-ethylene-3-methylimidazolium hydrogen sulfate and a preparation method thereof, belonging to the acid ion liquid. The molecular formula is as above; the preparation method comprises the following steps: (1) 1-vinylimidazole and 1,4-butanesultone with a molar ratio of 1:1.1 are adopted for an reaction under the room-temperature of about 50 DEG C; and then zwitterionic 1-ethylene-3-methylimidazolium hydrogen sulfate is obtained after washing and drying; (2) a concentrated sulphuric acid is dropped onto the 1-ethylene-3-methylimidazolium hydrogen sulfate under the temperature less than 10 DEG C and with the molar ratio of 1:0.96 to 1.04 between the 1-ethylene-3-methylimidazolium hydrogen sulfate and the concentrated sulphuric acid, the reaction is carried out for 3 to 6 hours; then the target product is obtained after washing and drying. The 1-ethylene-3-methylimidazolium hydrogen sulfate prepared by the method contains -SO3H and HSO4<-> and is provided with two proton bits, and therefore has good Br nsted acidity; the double-bond functional group on the side chain of the product can be adopted for chemical bond combination so as to anchor the product on sold carriers and is used for preparinge solid acid catalysts.

The invention provides a supported bi-functional catalyst as well as a preparation method and applications thereof, belonging to the catalyst containing platinum and an organic compound simultaneously. The catalyst has the compositions: an acidic ionic liquid of 1-vinyl-3-sulfobutyl imidazole hydrosulfate ([HSO3-bvim]HSO4), an active metal Pt and a carrier silica gel. The preparation method comprises the steps: the acidic ionic liquid of 1-vinyl-3-sulfobutyl imidazole hydrosulfate and the modified silica gel are added in a weight ratio of 0.05 to 1:1, then a mixed solution of solvent and deionized water as well as azo-bis-isobutryonitrile (AIBN) are added thereto, and then the [HSO3-bvim]HSO4 / SiO2 solid-acid catalyst is obtained after the reaction; and finally the target product of supported bi-functional catalyst is obtained after the reaction by adding chloroplatinic acid and an alcohol-water mixed solution in a weight ratio of 0.0001 to 0.01:1 of the metal platinum to the solid-acid catalyst. The supported bi-functional catalyst is used in the nitrobenzene catalytic hydrogenation synthesis p-aminophenol reaction, and has advantages of extreme high stability, high mechanical strength, abrasion resistance and low loss of active components.

The invention belongs to the technical field of organic metal catalysis, and concretely relates to an MOFs supported catalyst, a preparation method thereof, and an application in an olefin hydrosilylation reaction. The catalyst has a structure represented by formula (I); and in the formula (I), M is metallic platinum, rhodium, palladium or ruthenium, and R1 and R2 can be H or Br, and can be same to or different from each other. The preparation method of the catalyst comprises the following steps: adding pyrrole, bromine-substituted benzaldehyde and a solvent into a reactor, adding trifluoroacetic acid and DDQ, and reacting to obtain an organic framework monomer; reacting the organic framework monomer with 1,3,5-triethynylbenzene to obtain an organic framework polymer; and reacting a homogeneous solution of the metallic platinum, rhodium, palladium or ruthenium with the organic framework polymer to obtain the catalyst. The MOFs supported catalyst can efficiently catalyze the hydrosilylation reaction of hydrogen-containing silane and olefin, can be recycled through a simple technology, and can effectively improve the utilization rate of precious metals.

The invention relates to a metal and / or its oxide in situ doped silica compound and its use. The target product is prepared through metal or / and its oxide in situ doping of a silica compound and a hydrothermal synthesis process, and the specific surface area (BET) of the target product is 100-800m<2> / g. 100% of the metal or / and its oxide in situ doped silica compound contains 1-20wt% of metallic nickel or / and its oxide, 0-5wt% of rare earth metals or / and oxides thereof, 0-10wt% of rare earths or / and oxides thereof, 0-5wt% of alkali metals or / and oxides thereof, and the balance silica. The invention also provides an application of the metal or / and its oxide in situ doped silica compound as a catalyst for preparing methane from synthetic gas.

The invention discloses a graphene / molecular sieve composite catalyst and a preparation method thereof. The composite catalyst comprises, by weight, 5-40% of graphene and 60-95% of molecular sieve. The composite material has a quasi-two-dimensional lamellar structure, the ratio of the area of a single lamella to the thickness of the single lamella is more than 100 micrometers, the molecular sieve is evenly loaded on the surface of the graphene, and mesopore diameter is 2-30 nanometers. The preparation method includes: mixing the graphene, a silicon source, an aluminum source and a surfactant, separating out a graphene-containing part, crystalizing, purifying, and removing the surfactant. The graphene / molecular sieve composite catalyst has the advantages that the composite catalyst serving as a solid acid catalyst has enhanced catalytic activity, product yield and reusability can be evidently increased while the catalytic activity is not lowered when the catalyst is used in CBG and EHB reaction, and accordingly the catalyst is promising in application prospect.

The invention relates to a lanthanum-silicon composite oxide catalyst and a method for treating high-concentration formaldehyde wastewater by using the lanthanum-silicon composite oxide catalyst, and belongs to the technical field of wastewater treatment. The lanthanum-silicon composite oxide catalyst is prepared by dropwise adding a lanthanum nitrate solution into an ethyl orthosilicate ethanol solution, reacting, drying and roasting. According to the prepared lanthanum-silicon composite oxide catalyst, the catalytic activity of the active component lanthanum oxide in the lanthanum-silicon composite oxide is improved, the activation energy of formaldehyde oxidation reaction is reduced, and the formaldehyde oxidation capability of potassium hydrogen persulfate is enhanced. The method comprises the following steps of: by taking the lanthanum-silicon composite oxide as a catalyst and potassium hydrogen persulfate as an oxidizing reagent, stirring and reacting at 25-45 DEG C for 5-60 minutes, and catalytically oxidizing formaldehyde into carbon dioxide and water. According to the method, high-concentration formaldehyde wastewater can be effectively treated, and the catalyst is easy to recover, reusable, environment-friendly, safe and non-toxic.

The invention relates to a mesoporous molecular sieve of doped metal and an application thereof. The mesoporous molecular sieve is formed by mixing a template, an alkali source, a silicon source and a metal source at the molar ratio of (0.06-0.24):(0.1-0.3):1:(0.01-0.20), and stirring at 20-40 DEG C for 0.5-24 hours to obtain emulsion; carrying out hydrothermal reaction on the emulsion at 80-180 DEG C for at least 12 hours (or reacting in a microwave reactor at the power of 200-2100w for 1-10h), then successively cooling, filtering, washing to be neutral and drying to obtain solid matters; and roasting the solid matters at 400-800 DEG C for 1-15 hours to obtain the molecular sieve, wherein the molecular sieve has a specific area of (BET)200-1500m2 / g, pore volume of 0.5-3.0cm3 / g and aperture of 2-15nm. The mesoporous molecular sieve has catalytic activity at 200-550 DEG C and the catalytic activity does not decline after roasting at 700 DEG C for 20 hours. The molecular sieve can be used as a catalyst for reaction during methane preparation by synthesis gas, and has commercial value.

The invention provides a supported bi-functional catalyst as well as a preparation method and applications thereof, belonging to the catalyst containing platinum and an organic compound simultaneously. The catalyst has the compositions: an acidic ionic liquid of 1-vinyl-3-sulfobutyl imidazole hydrosulfate ([HSO3-bvim]HSO4), an active metal Pt and a carrier silica gel. The preparation method comprises the steps: the acidic ionic liquid of 1-vinyl-3-sulfobutyl imidazole hydrosulfate and the modified silica gel are added in a weight ratio of 0.05 to 1:1, then a mixed solution of solvent and deionized water as well as azo-bis-isobutryonitrile (AIBN) are added thereto, and then the [HSO3-bvim]HSO4 / SiO2 solid-acid catalyst is obtained after the reaction; and finally the target product of supported bi-functional catalyst is obtained after the reaction by adding chloroplatinic acid and an alcohol-water mixed solution in a weight ratio of 0.0001 to 0.01:1 of the metal platinum to the solid-acid catalyst. The supported bi-functional catalyst is used in the nitrobenzene catalytic hydrogenation synthesis p-aminophenol reaction, and has advantages of extreme high stability, high mechanical strength, abrasion resistance and low loss of active components.

The invention provides a homogeneous phase bi-functional catalyst used for the synthesis of p-aminophenol as well as a preparation and application process thereof, belonging to a platinum-bearing nano-particle and an acidic ionic liquid at the same time. The catalyst has the compositions: one active component: the acidic ionic liquid N, N, N-trimethyl-N-sulfobutyl-ammonium hydrogen sulfate, the other active component: the active metal Pt nano-particle, wherein, the acidic ionic liquid N, N, N-trimethyl-N-sulfobutyl-ammonium hydrogen sulfate and the metal Pt are present in a molar ratio of 1000 to 6000:1. The preparation method comprises: positioning the acidic ionic liquid N, N, N-trimethyl-N-sulfobutyl-ammonium hydrogen sulfate and chloroplatinic acid in three flasks, then adding alcoholand deionized water thereto, magnetically stirring the mixture for 0.5 to 5 hours, and finally preparing the catalyst after decompression and distillation. The homogeneous phase bi-functional catalyst used for the synthesis of p-aminophenol has advantages of mild process conditions, simple and convenient operation and rather high catalytic activity, the maximum nitrobenzene conversion rate can reach 100 percent, the maximum p-aminophenol yield is 90 percent, and the maximum p-aminophenol selectivity is 92 percent.

The invention discloses a hydro-desulfurization and denitrification process of diesel oil. The hydro-desulfurization and denitrification process is characterized in that the process uses a fixed bed reactor filled with a hydro-desulfurization and denitrification catalyst, the hydro-desulfurization and denitrification catalyst comprises a carrier and an active component, the carrier is the compound or mixture of MSU-G, SBA-15 and HMS, and the active component is the mixture of dimolybdenum nitride MO2N, tungsten nitride W2N, molybdenum carbide Mo2C and tungsten carbide WC; the reaction condition of the fixed bed reactor includes: reaction temperature is 320-360 DEG C, reaction pressure is 6-8MPa, hydrogen to oil volume ratio is 300-600, and volume space velocity is 1.0-2.5h<-1>. By the hydro-desulfurization and denitrification process, the total sulfur content of the diesel oil can be controlled to be lower than 5ppm, and the total nitrogen content of the diesel oil can be controlled within 10ppm at the same time.

The invention discloses a synthesis method for calix [4] arenes substituted by 2-diphenylphosphine benzoyl as shown in drawings and discloses the application of calix [4] arenas serving as a catalyst in aza-Baylis-Hillman reaction for effectively preparing aza-Baylis-Hillman reaction affixture. The invention has the advantages of simple preparation technique for catalyst, low catalyst consumption, rapid reaction speed, gentle reaction conditions, etc.

The invention aims to improve the utilization rate of waste iron tailings, provides a method for preparing high-modulus water glass from iron tailings, and belongs to the technical field of water glass preparation. The method comprises the steps of 1) adding the iron tailings and liquid alkali into a reaction kettle in proportion, adding an activated catalyst SY-1, and carrying out closed reaction, wherein the catalyst SY-1 is a compound containing vanadium and phosphorus; and 2) filtering the material after the reaction is finished to obtain a liquid, namely, a water glass product with the modulus of 2.5-3.5. The method is low in energy consumption and simple to operate, and solves the environmental and recycling problems of the industrial solid waste iron tailings. The modulus range of the water glass prepared by the method is 2.5-3.5, so that the comprehensive utilization degree of the iron tailings is improved, and a new way is provided for effective utilization of silicon dioxidein the iron tailings.

The invention discloses an in-kettle nucleating method for preparing high-performance polypropylene. A defined amount of triethyl aluminum, an external electron donor, a nucleating agent, and a catalyst are added in a kettle, and react at a set temperature and a pressure, wherein the mol ratio of the catalyst to a cocatalyst to the external electron donor, namely Ti:Al:Si, is (1-20):(250-300):(20-100), the polypropylene is prepared through in-kettle nucleating; and the prepared polypropylene has modulus of elasticity in static bending of above 2 MPa, tensile strength of above 34 MPa, high combination property, and better economy and application values.

The invention provides a preparing method of denitration catalyst regeneration intensity repair fluid according to the problems existing in the conventional catalyst regeneration technology, comprising the steps of: (1) 8- 10 parts by weight of titanium dioxide containing tungsten or molybdenum, 2-3 parts of silica solution, 0.5-1 part of suspension from being mixed and stirred evenly with 70-100 parts of deionized water; (2) 0.05-0.1 part by weight of binder is then added in the suspension obtained in step (1), and stirred until the complete dissolution of the binder, after which the pH of the suspension is regulated as 1-3. Then 0.1-1 part by weight of ammonium metavanadate or vanadyl sulfate is added and ball ground to obtain the intensity repair liquid, and then the same is used for regenerating the inactivated denitration catalyst. The mechanical properties of the regenerated catalyst are improved obviously while the activity thereof is improved.

The invention belongs to the technical field of organic metal catalysis, and concretely relates to an MOFs supported catalyst, a preparation method thereof, and an application in an olefin hydrosilylation reaction. The catalyst has a structure represented by formula (I); and in the formula (I), M is metallic platinum, rhodium, palladium or ruthenium, and R1 and R2 can be H or Br, and can be same to or different from each other. The preparation method of the catalyst comprises the following steps: adding pyrrole, bromine-substituted benzaldehyde and a solvent into a reactor, adding trifluoroacetic acid and DDQ, and reacting to obtain an organic framework monomer; reacting the organic framework monomer with 1,3,5-triethynylbenzene to obtain an organic framework polymer; and reacting a homogeneous solution of the metallic platinum, rhodium, palladium or ruthenium with the organic framework polymer to obtain the catalyst. The MOFs supported catalyst can efficiently catalyze the hydrosilylation reaction of hydrogen-containing silane and olefin, can be recycled through a simple technology, and can effectively improve the utilization rate of precious metals.

The present invention is one kind of ionic liquid catalyst for produce alkylated oil and its preparation process. The catalyst is ionic liquid modified with sulfur or oxygen containing organic compound, benzene or alkyl derivative of benzene, and is used in preparing alkylated oil. It possesses alkylation selectivity, and the alkylated oil product has high octane number, C8 component accounting for 70-90 %, and the outstanding advantage of trimethylpentane proportion in the C8 component over 90 %. In addition, the catalyst can result in product yield up to 170-180 vol% of olefin feed.

The invention discloses a preparation method of a self-cleaning Bi2Ti2O7 / TiO2 nanowire array composite film with visible-light response, relating to a preparation method of a nanowire array composite film. The invention aims at solving the problem that the glass cleaning of the modern high buildings needs to be completed manually so that the resources are consumed, relatively high risk exists and the elements of sunshine and rainwater cannot be utilized to maintain the surface cleaning. The preparation method comprises the following steps: 1, preparing a titanium dioxide nanowire array precursor film-loaded glass substrate; and 2, preparing a Bi2Ti2O7 / TiO2 nanowire array composite film so as to obtain the self-cleaning Bi2Ti2O7 / TiO2 nanowire array composite film with visible-light response. The preparation method is completed under simple hydrothermal conditions, so that the synthesis method is simple and the cost is low. According to the preparation method, the self-cleaning Bi2Ti2O7 / TiO2 nanowire array composite film with visible-light response can be obtained.