239results about How to "Improve catalytic reaction efficiency" patented technology

The invention discloses a saccharifying method of xylon cellulose through ultrasonic coordinated modified cellulose enzyme, which comprises the following steps: grinding and predisposoing xylon in the raw material through alkaline; reacting activated methoxy carbowax and cellulose enzyme in the citrate-sodium citrate buffer solution to obtain modified cellulose enzyme; blending modified cellulose enzyme, beta-glucosidase, amylase and pectase to obtain composite liquid; adding composite enzyme into predisposed raw material according to corresponding proportion; proceeding enzyme catalytic reaction through ultrasound; filtering; decompressing; evaporating; obtaining condensed sugar liquid.

The invention relates to a method and device for degrading organic wastewater by micro active oxygen generated through electrocatalytic reduction of air oxygen, and belongs to the technical field of wastewater treatment. According to the method and device, air (aeration) is continuously connected into the cathode inside an electrochemical reactor, a large amount of micro active oxygen such as O3, free radical *OH and H2O2 is generated through a concerted reaction under the combined action of various catalysts and cathode currents, the micro active oxygen has extremely-high oxidizing capacity, hence, organic matter in the wastewater can be directly oxidized and degraded, and the purpose of deeply removing organic pollutants is achieved. In addition, the adopted method and device are simple, power consumption is small, and the degradation effect is good. Moreover, equipment can continuously and efficiently operate in a circulation mode, and great practical application value is achieved.

The invention provides a method for exothermic catalytic reaction under increased pressure and a reactor thereof. The method and the reactor are characterized in that: a round pressure vessel (7) with a catalytic bed (4) is used; a gas inlet (1) is positioned on an end cover of the vessel (7) and connected with an internal distribution drum (5) to form a shunt passage (2) for reacting gases; a gas outlet (11) is communicated with a space that is formed between the wall of the vessel (7) and an external distribution drum (6), to form a concentration passage (3) for the reacting gases, the catalytic bed (4) is defined between the external distribution drum (6) and the internal distribution drum (5) and is filled with catalysts; the reacting gases flow axially in a centrifugal manner from the internal distribution drum (5) to the external distribution drum (6). The method and the reactor have the advantages of axial and uniform distribution of the reaction gases, optimum distribution of bed temperature, high utilization rate of catalysts, and low pressure drop of fluids passing through the reactor. The invention is suitable for catalytic reactions in methanol, ammonia and dimethyl ether synthesis, as well as other exothermic gas-solid catalytic reactions under increased pressure.

The invention belongs to the chemical power supply field, and concretely relates to a high-energy-density Li-air battery air electrode, and a battery and a making method thereof. The air battery is a non-aqueous chargeable Li-air (or Li/O2) battery concretely, and comprises a lithium metal negative electrode, a non-aqueous electrolyte, a diaphragm and the air electrode, the air electrode comprises a catalyst, a carrier and a binder, and the carrier is a composite double pore system material composed of nano-graphene having a two-dimensional nanostructure, a high heat conduction coefficient (-5000W/m.k), a high specific surface area (-2630m<2>/g) and a high electrical conductivity (10<3>-10<4>Sm<-1> and an SiO2 aerogel, provides a circulation channel and a storage space for O2 and discharge reaction products respectively, and adopts a double-surface electrode structure; and the non-aqueous electrolyte adopts a lithium salt and organic solvent mixed electrolyte, and has the advantages of high electrical conduction, low volatility, good chemical stability and the like. The oxygen-selective diaphragm is added to the air battery to increase the pressure of O2 in a reaction area and prevent water in air from entering the battery, so the metallic lithium is effectively protected, and the safety of the battery is increased.

The invention relates to a method for synthesizing a granular beta molecular sieve with montmorillonoid, comprising the following steps: acidification treatment and high-temperature roasting are carried out to the montmorillonoid, and the montmorillonoid which is acidified is soaked and heated by template agents, and then the montmorillonoid which is activated is used as raw material to provide total or partial aluminum source, and then the granular beta molecular sieve is prepared by adding template agents and carrying out hydrothermal crystallization; in the invention, the prepared beta molecular sieve grows on the surface of the montmorillonoid closely, so as to form a similar core-shell structure, and the catalytic reaction efficiency is improved by shortening the diffused route of reactants and product molecules in a molecular sieve crystal. The method not only expands the raw material range for synthesizing the beta molecular sieve, but also further reduces the preparation cost of the beta molecular sieve with a crystal seed method.

The invention provides a method and a device for deodorization by coupled catalytic oxidation. An obnoxious gas passes through a reaction system provided with a vacuum ultraviolet lamp, a UVC ultraviolet lamp and a catalyst. The ozone, the UVC and the catalyst in the system are subjected to coupled catalysis reaction to generate a high-concentration hydroxyl free radical and oxidize hydrogen sulfide, ammonia gas and volatile organic contaminant in the obnoxious gas; and a manganese dioxide adsorbent is arranged at the tail end of the reaction system for destructing the residual ozone in the air and adsorbing the residual contaminant. The device for deodorization by coupled catalytic oxidation provided by the invention comprises a spoiler, an UV irradiation reactor, an air pipe, a fan and a tail gas destructor, wherein the fan pumps the obnoxious gas into the device; the spoiler is fixed at the front end of the UV irradiation reactor; an UV lamp tube is arranged in the reactor; a catalytic grid is arranged between the lamp tube; a catalyst film is coated on the surface of the grid; the UV irradiation reactor is connected with the air pipe; and the tail end of the air pipe is connected with the tail gas destructor.

The invention relates to a method for improving the property of creatine kinase as a reaction catalytic enzyme in phosphokinase production by mutating and transforming rabbit muscle creatine kinase by using a gene engineering technique. According to the method, the gene engineering technique is adopted to perform multi-point mutation on rabbit muscle creatine kinase, so that the properties, such as the enzymatic property, the substrate affinity, the acid/alkali resistance and the thermal stability, of creatine kinase in phosphokinase production are improved. The method has the advantages that the catalysis property of creatine kinase in a phosphokinase enzymic method production process environment with the pH value of 8-10 and the temperature of 25-45 DEG C is greatly improved through enzyme mutation transformation, the production efficiency is improved, the production cost is lowered, and great significance is achieved for developing the enzymic method phosphocreatine industry.

The present application discloses a microfluidic chip, a production method and an in-situ catalysis and detection method thereof, wherein a periodic peak microstructure is processed inside a silicon-based Y type channel. According to the present invention, after the black silicon surface is subjected to hydrogenation treatment with hydrofluoric acid, the in-situ chemical growth of silver nanoparticles on the peak microstructure surface can be achieved, such that the catalytic reaction efficiency and the reaction activity of the reduction of p-nitrophenol into p-aminophenol are improved by using the large specific surface area and the roughness of the Ag-black silicon composite structure (Ag-BS); the surface plasma resonance motif is easily formed with the Ag-BS composite structure so as to be used for surface-enhanced Raman scattering (SERS) detection; and the Ag-BS micro-nano-structure composite device has wide application prospects in highly integrated chemical synthesis, analysis, biosensing, diagnosis and other fields.

The invention discloses a method for preparing dichloroaniline by continuously catalyzing and hydrogenating dichloronitrobenzene. The method comprises the following steps: I, filling a fixed bed reactor with catalyst, and introducing reduction gas into the fixed bed reactor to reduce the catalyst; II, lowering the temperature of the fixed bed reactor to a reaction temperature, pumping an ammonia-ammonium chloride buffer solution, introducing the molten dichloronitrobenzene, and carrying out the catalytic hydrogenation reaction under the condition of the reaction temperature; and III, separating the material after the catalytic hydrogenation reaction by virtue of an oil-water separator to obtain an organic phase and a water phase, wherein the organic phase is the dichloroaniline. The conversion rate of the raw material dichloronitrobenzene is more than or equal to 99.5 percent, the mass concentration of a dechlorination byproduct is less than 0.2 percent, the mass purity of the dichloroaniline is more than or equal to 99.2 percent, the stability of the catalyst is stable, the catalytic hydrogenation reaction efficiency is high, and the process flow is capable of saving the resource and is environmentally friendly.

The present invention relates to one microwave treater capable of purifying engine exhaust gas under the action of its microwve field and the metal catalyst used in the ceramic carrier of the microwave treater and its preparation process. The catalyst carried on the ceramic carrier to catalyst the exhaust gas pufiying chemical reaction includes the oxide of Cu, Ce, Mn, Co, V and other metals and noble metals. The catalyst can catalyze the reduction reaction of Co, HC, NOx etc. effectively while the microwave treater under the action of the microwave makes the carbon particles exhausted by the diesel engine and adsorbed onto the surface of the carrier to regenerate the catalyst. The present invention can solve the problem of exhaust gas pollution, raise efficiency of catalytic reaction and save energy.

The invention relates to a spinel film with controllable feature and a preparation method thereof. The spinel film is prepared by the following steps: adopting an in-situ synthesis technology, directly taking a metal aluminum sheet as a substrate, utilizing aluminum on the surface of the substrate for providing Al3+source needed by the growth of spinel, taking ethanol and water with equal volume ratio as a solvent, taking urea as a alkaline reagent, and controlling the concentration ratio of the urea to divalent metal salt, thus realizing the one-step synthesis of the spline film under low-temperature condition. According to the method, the process is simple, the raw materials can be obtained easily, the cost is low, the repeatability is good, the feature of the film is controllable, and the problems that in the original method for preparing the spinel film, the raw materials are expensive, high-temperature calcination and complex post process are needed, the film is easy to fall from the substrate, and the like are solved.

The invention discloses a multi-layer drum type photocatalysis purification tank applicable to a farmland drainage canal. The structure of the photocatalysis purification tank comprises a purification tank, a support base, rotary purification cages, photocatalysis ceramic particles, quartz burners and a synchronous drive device, wherein the rotary purification cages are fixed on the support base in parallel through spindles, the photocatalysis ceramic particles are placed in the rotary purification cages, the quartz burners are fixed among the rotary purification cages, the top of the support base is 10-20cm higher than the top of the purification tank, and the rotary purification cages are connected with the synchronous drive device. The multi-layer drum photocatalysis purification tank applicable to the farmland drainage canal has the advantages of simple structure, high purification efficiency, no maintenance and the like, and can be used for treatment of farmland drainage which is seriously polluted.

A microreactor (1) comprises a vacuum casing (2), a microreactor proper (4) located in a vacuum-tight cavity (3) in the vacuum casing (2), and a getter heat-generation substrate (6) positioned on at least one surface of the microreactor proper (4). The microreactor proper (4) has a feed inlet (19a) connected to outside the vacuum casing (2) by way of a feed supply pipe (5A) and a gas outlet (19b) connected to outside the vacuum casing (2) by way of a gas discharge pipe (5B). The getter heat-generation substrate (6) comprises a substrate (7), and a heat generator (9) and a getter material layer (10) that are located on the substrate (7) alternately in mutual non-contact fashion.

The invention discloses an EU-1 molecular sieve and a synthesis method thereof, wherein the crystal structure of the EU-1 molecular sieve is a typical EUO structure. The synthesis method comprises: mixing an inorganic alkali, an aluminum source, a silicon source, a templating agent and water, stirring to obtain a silicon-aluminum gel, and crystallizing for a certain time; and adding water, a second templating agent and alumina, uniformly stirring, and carrying out hydrothermal crystallization to obtain the EU-1 molecular sieve. According to the present invention, the EU-1 composite molecular sieve synthesized by the method is the low silica-alumina ratio zeolite, and has the high crystallinity; and with the synthesis method, the generation of the impurity crystal can be avoided, and the operation is simple and easy to perform.

An isothermal reactor is disclosed. The isothermal reactor comprises a shell, a catalyst bed layer, a tube sheet and heat exchange tubes. The upper ends of the heat exchange tubes are mounted to the tube sheet. The lower ends of the heat exchange tubes penetrate into the catalyst bed layer. The tube sheet comprises at least two mounting zones with different heat exchange tube arranging densities. According to reaction characteristics of reaction gas in the isothermal reactor, the tube sheet is divided into a plurality of the mounting zones, and the mounting zones are provided with different numbers of the heat exchange tubes. The isothermal reactor overcomes a catalyst deactivation problem of isothermal reactors at present, achieves energy conservation and consumption reduction, saves materials of the heat exchange tubes and reduces the equipment cost.

The invention relates to a method for preparing strong-fragrance peanut oil through a microchannel reactor. The method comprises the following steps of step I, pumping peanut enzymolysis reaction fluid and an enzyme solution into the microchannel reactor, performing mixing in a first mixing module to obtain a mixture, enabling the mixture to enter a reaction module, and performing an enzymolysis reaction; step II, performing high-temperature enzyme activity inactivation, and ending the enzymolysis reaction; step III, thoroughly mixing a reaction system with reducing sugar and peanut oil so as to obtain a mixed reaction system; step IV, enabling the mixed reaction system to enter a second high-temperature module, rapidly raising the temperature to reach the temperature required by a technology, and performing a Maillard reaction; and step V, enabling the reaction system to flow across a low-temperature module and flow out of the microchannel reactor so as to obtain crude products of the strong-fragrance peanut oil. Through the adoption of the method disclosed by the invention, the enzymolysis process can be accurately controlled, and the thermal reaction temperature and the post-treatment temperature can be quickly and accurately controlled; and through the usage of the microchannel reactor, amplification effects are not generated, upgrading and amplification are easy, and seamless amplification from research and development to production can be realized.

The invention discloses a solid acid catalyst and a preparation method and application thereof in esterification transesterification. The preparation method of the solid acid catalyst comprises the following steps of carrying out a liquid phase deposition reaction on a graphene oxide suspension dissolved with an aluminum salt to obtain aluminum oxide modified graphene oxide, and carrying out a mixed reaction on the aluminum oxide modified graphene oxide and concentrated sulfuric acid to obtain the solid acid catalyst. The preparation method is simple to operate, the method has the advantages of simple operation, mild conditions, very good catalysis effect on esterification and transesterification of the kitchen waste oil, realization of the fatty acid methyl ester yield higher than 90%, easy separation of the solid acid catalyst from the product, cyclic utilization after simple treatment, no pollution, and substantial reduction of the production cost of biodiesel prepared from the kitchen waste oil.

The invention discloses a flower-shaped silicon dioxide material with a porous hierarchical structure and a preparation method thereof. A porous functional composite material is synthesized by taking a quaternary ammonium type surfactant as a template agent and a benzene compound as an emulsifier, hydrolyzing a silicon source under an alkaline condition, and carrying out micro-emulsion reaction under a room-temperature condition. The flower-shaped silicon dioxide material with the porous hierarchical structure and the preparation method thereof have the advantages that the preparation method is simple, and low cost and high repeatability are achieved, so that the preparation method is suitable for industrial production; the silicon dioxide material prepared by the method has the flower-shape-like porous hierarchical structure, and has high specific surface area and abundant pore channel structures, so that the silicon dioxide material can be widely applied to various fields including microelectronics, biology, catalysis and the like.