30results about How to "Does not affect catalytic activity" patented technology

The invention relates to a preparation method of composite catalyst of the titanium silicate molecular sieve and the nano-carbon fiber. The composite catalyst of the titanium silicate molecular sieve and the nano-carbon fiber prepared by the method of the invention has strong bonding force between the active component of the titanium silicate molecular sieve and the nano-carbon fiber. Comparing with the industrial micro-nano TS-1 powder (100-500nm), the filtering quality is significantly improved. In the course of using the TS-1 catalyst, the problem of the solution dispersion and separation can be solved; the method is simple and the application range is wide. The catalytic performance of the made composite catalyst is excellent, and can be used for the cyclohexanone ammoximation, the conversion rate of the cyclohexanone and the cyclohexanone oxime selectivity can both reach over 98 percent.

The invention belongs to the technical field of catalysts and especially relates to a preparation method for an efficient load type ozone oxidation catalyst. The preparation method for the efficient load type ozone oxidation catalyst provided by the invention comprises five processes of preparing a titanium sol solution, preparing a template agent sol solution, preparing a mesoporous titanium dioxide molecular sieve precursor, de-molding the mesoporous titanium dioxide molecular sieve precursor and loading a MnO2 active component. According to the invention, a self-prepared mesoporous titanium dioxide molecular sieve is used as a carrier, a Mn metallic oxide catalyst is loaded into an inner pore structure of a titanium molecular sieve, the molecular sieve is composed of active components, the content of the active components in the catalyst material is ultrahigh, the removal rate of the pollutants is high, the catalytic activity is high, the active component loss is less and the catalyst has an obvious catalytic effect in ozone oxidation treatment for antibiotic wastewater, such as, chloramphenicol wastewater, penicillin wastewater, erythrocin wastewater, streptomycin wastewater, vancomycin wastewater and pipemidic acid wastewater.

The invention belongs to the technical field of biological detection and relates to a novel method for detecting the activity of hydrogen sulfide synthetase by using a hydrogen sulfide fluorescence probe as well as an application approach of the method. The method is suitable for detection of the activity of hydrogen sulfide synthetase such as CBS, CSE and CL, and comprises the following steps: shearing a tissue sample into small blocks, grinding, performing cell lysis in a tissue cell lysis solution, performing protein quantification on a lysis product, as the drawings, adding a reaction system (comprising the tissue cell lysis product, L-cysteine and 5-pyridoxal phosphate) into a reaction pool on an outer ring of a reaction bottle, and adding an absorption system (comprising operating fluid of the H2S fluorescence probe containing a reaction adjuvant cetrimonium bromide) into an absorption pool on an inner ring of the reaction bottle, wherein H2S gas molecules generated in the reaction system are combined with the fluorescence probe in the absorption system, the system can be used for fluorescence assay and fluorescence imaging, the H2S content is quantitatively detected, and the activity of the H2S synthetase is intuitively reflected. The invention can provide a good method for research of H2S-related signal paths and significance and diagnosis of H2S in disease processes.

The invention belongs to the technical field of medical materials, and relates to preparation of drugs for catalytic treatment of tumors, in particular to a hyaluronic acid modified FeCo bimetal synergistic monatomic catalyst as well as a preparation method and application of the hyaluronic acid modified FeCo bimetal synergistic monatomic catalyst. The hyaluronic acid modified FeCo bimetal synergistic monatomic catalyst is prepared by the following steps: firstly, synthesizing a FeCo bimetal synergistic monatomic catalyst; the FeCo bimetal synergistic monatomic catalyst can play a synergistic role, so that the catalytic efficiency is remarkably improved. By adopting the hyaluronic acid coated FeCo bimetal synergistic monatomic catalyst, the antitumor activity is remarkably improved and the toxicity to normal tissues is effectively avoided while the catalytic activity is not influenced and the water solubility is increased, so that the biomedical application of the FeCo bimetal synergistic monatomic catalyst is expanded, efficient catalytic tumor treatment is realized, great potential and prospects are realized in the aspect of tumor treatment application.

The invention discloses a titanium-containing molecular sieve composite material which is characterized in that: the composite material contains Silicalite-1 used as a matrix and also contains silicon, titanium and oxygen elements; based on oxides, the molar ratio of silicon to titanium is 1:>(0-0.05); the X-ray diffraction spectra of the composite material shows the characteristic diffraction peaks of an MFI (Mobil Five) structure; and in the TEM (Transmission Electron Microscopy)-spectrum microscopic composition of the composite material, the molar ratio of TiO2 to SiO2 of the composite material at the edge of which a target is located is more than 150% that of the composite material in the center of which a target is located. The invention also discloses a preparation method of the titanium-containing molecular sieve composite material.

The invention relates to a load type visible light photocatalyst and a preparation method thereof. Polyvinylpyrrolidone (PVP) and polyving akohol (PVA) are weighed according to the mass ratio at the room temperature, deionized water is added for dissolution, the PVP and the PVA are heated in a water bath at 90 DEG C and stirred till the PVP and the PVA are completely dissolved, Ag/AgBr/TiO2 visible light photocatalyst powder is added while the temperature is maintained, and the Ag/AgBr/TiO2 visible light photocatalyst powder is evenly dispersed into the PVA and PVP mixed solution; and after the solution is cooled to the room temperature, a cross-linking agent and a catalyst are added for immobilization, gel is formed, and the gel can be cut into small cubic integrated visible light photocatalysts of certain sizes as needed. By the adoption of the load type visible light photocatalyst and the preparation method thereof, the problems that a powder material is difficult to recycle, secondary pollution is caused, and the photocatalysis efficiency is low after immobilization are solved, and the load type visible light photocatalyst and the preparation method thereof are used for the field of treatment of water pollution which is difficult to treat and is high in organic matter content. Complex hydrogel carriers have higher moisture content and have better diffusivity to the visible light photocatalyst powder, the contact area between the powder and organic matter is increased, the photocatalysis efficiency of the visible light photocatalyst is improved, and recycling and reutilization are achieved.

The invention relates to a preparation method and application of a porous carbon coated PdFe/C alloy nano-frame. According to the preparation method, 1-naphthylamine (C10H9N), adopted as a coordination agent, forms a Pd(II)-(C10H7-NH2) flaky yellow precipitate complex with PdCl2; the Pd(II)-(C10H7-NH2) flaky yellow precipitate complex is arranged in an aqueous solution of FeCl3 so as to be subjected to ultrasonic mixing; an obtained mixture is stirred for a long time, so that Fe<3+> can be fully adsorbed on the surface of the flaky precipitate, and an obtained Pd(II)/Fe(III)-(C10H7-NH2) flakyyellow-green precipitate is arranged in an inert atmosphere so as to be subjected to high-temperature heat treatment, so that the porous carbon coated PdFe/C alloy nano-frame can be obtained. The porous carbon coated PdFe/C alloy nano-frame prepared by the method has the advantages of ultrafine particle size of PdFe alloy, adjustable compositions, high electrochemical activity, high stability, simple preparation process, convenience in batch production, environmental friendliness and the like. The porous carbon coated PdFe/C alloy nano-frame shows higher electrocatalytic activity and stabilitywhen being used as a cathode oxygen reduction catalyst under an acidic condition.

The invention relates to the technical field of molecular biology, in particular to a preparation method and application of a Pt-based alloy/MOFs catalyst with high hydrogenation selectivity. A Pt alloy/MOFs structure in which Pt alloy particles are uniformly loaded on the surface of MOFs is prepared through a one-step solvothermal method; the preparation method is simple, the reaction environment is not harsh, and no special atmosphere is needed. The obtained product is unique in structure, metal particles are small in size, uniform in distribution and not prone to loss, and meanwhile the catalytic activity of metal cannot be affected. In the aspect of catalytic performance, the Pt alloy/MOFs catalyst prepared by the invention can be used for catalytic hydrogenation of cinnamyl aldehyde at normal temperature and normal pressure, and is excellent in performance. In addition, the catalyst can also catalyze selective hydrogenation of 3-nitrostyrene, which proves that the catalyst provided by the invention has wide application.

The invention provides a methane low-temperature combustion catalyst for a boiling-bed reactor as well as a preparation method and application of the methane low-temperature combustion catalyst. The methane low-temperature combustion catalyst consists of alumina supporters and active components, wherein the alumina supporters are alumina microspheres generated from aluminum hydroxide through high-temperature roasting, the alumina microspheres comprise spherical supporters of kappa-Al2O3, delta-Al2O3, theta-Al2O3 or alpha-Al2O3; the active component is a perovskite type composite metal oxide. The alumina supporters provided by the invention have relatively large specific surface areas and are relatively high in water absorption rate, so that the loading capacity of the active component on the support can be increased, the active component is not liable to drop off, secondly, the roasted alumina supporters can directly load the active component by using an impregnation method, the preparation process is simple, the active components are uniformly distributed, the stability is high, in addition, the catalyst provided by the invention is high in catalytic activity, good in mobility and high in bulk density and can be used in the boiling-bed reactor.

The invention discloses a catalyst used for cathode reaction of a fuel cell and a preparation method thereof. Firstly, an imidazole compound and zinc nitrate are treated in a solution, in a standing manner, to prepare a porous metal organic framework; then transition metal ions are adsorbed by the metal organic framework; further, high temperature treatment is carried out to reduce the transitionmetal ions into metal nanoparticles having uniform particle size and being coated with a carbon layer, thus preparing the catalyst. The non-noble metal composite catalyst is prepared with the metal organic framework and inorganic salt being precursors, so that on the basis of guaranteeing catalytic activity and stability of the catalyst, the cost of the catalyst is reduced. The method is simple and is suitable for industrial production.

The invention discloses a short-chain alcohol intermediate for efficiently preparing high-molecular-weight polyether synthetic oil as well as a preparation method and application of the short-chain alcohol intermediate, and the short-chain alcohol intermediate is prepared by carrying out polymerization reaction on short-chain alcohol serving as an initiator and epoxide under the action of a catalyst. The preparation method is low in byproduct content, narrow in molecular weight distribution, simple in production process, free of aftertreatment and high in yield. Meanwhile, the short-chain alcohol intermediate prepared by the method disclosed by the invention is weakly acidic, so that a weakly acidic condition required by DMC catalysis in the preparation process of high-molecular polyether synthetic oil can be met, the short-chain alcohol intermediate can be directly subjected to polymerization reaction with epoxide without treatment and is not easy to inactivate, and relatively high reaction activity is maintained; meanwhile, the materials can be directly discharged without neutralization, so that the narrow-distribution high-molecular-weight oily polyether is finally prepared. Meanwhile, the short-chain alcohol intermediate is low in ion content, so that the catalytic activity of the catalyst is not influenced, and the defect of refining treatment by adopting a base catalyst is avoided.