11results about How to "Efficient Catalysis" patented technology

The application belongs to the field of medical materials, and particularly relates to a metal core enhanced double-barrier piezoelectric nano system and a preparation method and application thereof. The preparation method comprises the following steps: first, a core-shell structure of'metal@mesoporous titanium dioxide@mesoporous barium titanate' is prepared through a step-by-step reaction, and then the target nanoparticles are obtained through lipid wrapping. The system innovatively constructs a double-barrier structure, can self-trigger active oxygen under a physiological pressure of 4 mmHg, realizes endogenous pressure self-driven treatment of malignant ascites, has the advantages of low pressure, high catalytic efficiency, long-term structural stability and good biocompatibility, solves the problems that existing treatment methods are highly invasive and depend on exogenous stimulation, and provides a new safe and efficient technical scheme for the treatment of malignant ascites.

The invention discloses a cerium-based photosensitizer, a preparation method and application of the cerium-based photosensitizer in photocatalytic reaction, and relates to the technical field of coordination chemistry and photocatalysis. The general formula of the cerium-based photosensitizer is Ce (L1) 3 (L2) m, and L1 comprises a strong field anion ligand of at least one strong electron withdrawing group or a strong field anion ligand of a rigid structure; l2 is a neutral nitrogen-containing heterocyclic ligand, and m is 0 or 1. According to the invention, strong visible light absorption and long excited state life can be achieved by introducing L1, and the Ce < + > / Ce < 4 + > oxidation potential can be reduced to a mild range, so that the Ce < 4 + > intermediate can be efficiently reduced by a mild reducing agent generated in the reaction, and simple catalytic circulation without an external reinforced reducing agent is realized. When being applied to boronation reaction of various alkenyl / aryl / heteroaryl halides and various organic boron reagents, the photosensitizer shows high catalytic activity (the yield is as high as 91%), the performance is superior to that of a noble metal photosensitizer, but the cost is remarkably reduced, and the photosensitizer is environment-friendly.

The application relates to the technical field of high ignition point insulating oil, and particularly discloses a metal-supported catalyst and application of the metal-supported catalyst in high ignition point insulating oil. The metal-supported catalyst comprises a carrier, an active metal supported on the carrier and a composite metal oxide mesoporous layer, the carrier is a metal oxide and is at least one selected from MoO2, Al2O3, ZrO2, MgO, TiO2 and SnO2; the active metal is a transition metal and is at least one selected from Fe, Co, Cu, Ni, Ti, Zr, Mn, V and Zn; and raw materials of the composite metal oxide mesoporous layer comprise SiO2, ZrO2 and a carbon precursor. The metal-supported catalyst can be used for synthesizing ester insulating oil, can produce high-efficiency catalysis on synthesis of the ester insulating oil with a small amount, has high cycle stability and can keep excellent catalytic efficiency after multiple cycles.

This invention discloses a catalytic synthesis method for 1-arylmethyl-4-arylmethyl-3-hydroxypyrrole-2-( 5H A method for reacting 1-arylmethyl-4-arylmethylenepyrrole-2,3-dione compounds and diethyl phosphonate in an organic solvent under the presence of a base catalyst undergoes a Michael addition and a 1,4-P-Brook rearrangement tandem reaction. Sodium ethoxide is then added for hydrolysis to yield 1-arylmethyl-4-arylmethyl-3-hydroxypyrrole-2,3-dione compounds and their derivatives. 5H )-ketone. This invention achieves 3-hydroxypyrrole-2-( )-ketone in one step through a series of reactions in a one-pot reaction mode. 5H Alkylation of ketones at the C(4) position: The catalyst used is mild and readily available, enabling highly efficient catalytic reactions with good yields of the target product. It is both economical and environmentally friendly, making it suitable for large-scale applications.

The invention belongs to the field of gene engineering and enzyme engineering, and particularly relates to an activity-improved UDP glycosyl transferase mutant and application thereof. The glycosyl transferase mutant is a four-combination mutant N2HN1I, and the amino acid sequence of the glycosyl transferase mutant is as shown in SEQ ID NO. 4. The mutant provided by the invention has higher catalytic activity, the conversion rate of a substrate crocetin is high, and the mutant has important industrial application value.

The utility model discloses a novel self-adhesive book wrapping film which comprises a cover protection film, a bottom paper protection film and a side protection film, and a first stainless steel positioning piece is fixedly arranged on the inner wall face of the side protection film. A photocatalytic layer, a first activated carbon adsorption layer and a first positioning layer are sequentially arranged in a first storage groove in the lower surface of the cover protection film from top to bottom, first adhesive layers are arranged on the lower surfaces of the first positioning layer and the cover protection film, and a plurality of first ventilation through holes are formed in the lower surfaces of the first adhesive layers; the first positioning layer is provided with a second breathable through hole, and the upper surface of the cover protection film is provided with a plurality of third breathable through holes; a second activated carbon adsorption layer and a second positioning layer are sequentially arranged in a second storage groove in the upper surface of the backing paper protective film from bottom to top; and second adhesive layers are arranged on the upper surface of the second positioning layer and the upper surface of the backing paper protective film. According to the technical scheme, the textbook protecting device is reasonable in structural design, not prone to damage, good in textbook protecting effect, good in peculiar smell removing effect and good in practicability.

The application discloses a method and device for catalytic leaching of argillaceous uranium ore based on ozone, and relates to the technical field of uranium leaching and reaction equipment. The application utilizes biomass raw materials and iron-based material powder to prepare a magnetic composite material with catalysis-adsorption dual functions through in-situ reduction by high-temperature heat treatment. The slurry of argillaceous uranium ore and the magnetic composite material are mixed in a reactor for reaction. Ozone is introduced through an aeration disc to avoid bubble aggregation, significantly increase the gas-liquid contact area, and improve the ozone utilization rate. A spiral guide plate is arranged in the reactor to effectively prolong the gas-liquid contact time and improve the ozone mass transfer efficiency. A magnetic recovery device is used to recover the magnetic material to ensure the catalyst activity, reduce the catalyst loss rate, and realize efficient catalysis. Through optimization of the reactor structure, the catalyst preparation process and the process flow, the ozone utilization rate and the leaching efficiency of the argillaceous uranium ore are significantly improved, and the catalyst recycling and the recycling of residual gas are realized.

This invention relates to the field of chemical synthesis, and more particularly to a process for producing allyl diethylene glycol dicarbonate, comprising the following steps: using allyl alcohol and dimethyl carbonate as raw materials, a transesterification reaction is carried out under the action of a core-shell catalyst to produce dipropylene carbonate; after solid-liquid separation and vacuum distillation to recover methanol and dimethyl carbonate, a second transesterification reaction is carried out with diethylene glycol under the same catalyst to produce allyl diethylene glycol dicarbonate; finally, high-purity product is obtained by multi-stage vacuum distillation purification. The core-shell catalyst uses MCM-41 molecular sieve as a support, with an amino-modified and zirconium-ion-coordinated core, encapsulated by an interface layer and a phenyl-modified silica shell, exhibiting high activity, high selectivity, and excellent structural stability. This process is mild, the catalyst is recyclable, and the product yield is high with excellent purity, making it suitable for industrial production.

This invention relates to the field of functional polymer materials and discloses a method for preparing an antibacterial composite nanofiber material with cascade activity. The method includes: dissolving a gold precursor in a solvent; adding a polymer to obtain a polymer solution; reacting with a sodium borohydride solution; electrospinning to obtain an Au composite nanofiber membrane; dissolving TCPP in a mixed solvent of N-N-dimethylformamide / ethanol; adding Cu₂O, polyvinylpyrrolidone, and trifluoroacetic acid; reacting to obtain Cu-TCPP; adding the Cu-TCPP dispersion to the surface of the Au composite nanofiber membrane under vacuum filtration; and drying. In the antibacterial composite nanofiber material of this invention, Cu-TCPP is stably anchored on the surface of the nanofiber membrane, preventing excessive encapsulation of Cu-TCPP and thus reducing the therapeutic effect. In a weakly alkaline environment conducive to infection, this antibacterial composite nanofiber material can utilize Au nanozymes as initial enzymes to continuously catalyze the production of gluconic acid and H₂O₂ from glucose, thereby activating the POD-Like activity of Cu-TCPP to catalyze the generation of hydroxyl radicals to kill bacteria.

The utility model relates to the technical field of plasma thermocatalysis, and discloses a miniature plasma thermocatalysis reaction device which comprises a base, a catalysis mechanism is arranged at the top of the base and comprises a thermocatalysis reactor, the thermocatalysis reactor is arranged at the top of the base, and the thermocatalysis reactor is arranged on the base. A heating furnace is fixedly connected to the right side of the thermocatalytic reactor, the right side of the top of the heating furnace communicates with a reactor, and a system pressure gauge is arranged on the left side of the top of the heating furnace. According to the utility model, gas and liquid raw materials enter the reactor through a gas path and a circulating liquid path respectively; a touch screen sets flow pressure; a control button starts a heating furnace for gradient heating and constant temperature; a plasma cathode in a reaction section is combined with a high-frequency power supply to adjust power; the product is analyzed by a chromatograph after being separated, flow is controlled by a valve, and the device is miniature and efficient in catalysis.

This invention discloses a method for preparing a peak-supported carbon nanocatalyst by metal-directed carbonization, comprising: Step 1: preparing hierarchical organic microspheres; mixing at least one aldehyde compound with an aprotic solvent to obtain solution I, mixing at least one amino compound with a protic solvent to obtain solution II, and mixing solution I and solution II to perform a condensation reaction to obtain hierarchical organic microspheres; Step 2: loading metal ions; dispersing the hierarchical organic microspheres prepared in step 1 in a solution containing metal ions, and loading the metal ions onto the hierarchical organic microspheres to obtain a metal ion-organic microsphere composite; Step 3: carbonization; subjecting the metal ion-organic microsphere composite prepared in step 2 to carbonization treatment to obtain a peak-supported carbon nanocatalyst. The catalyst prepared by this invention has the characteristics of highly accessible active sites and structural stability, exhibiting excellent anti-poisoning performance and catalytic activity.