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 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 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 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 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.