21 results about "Catalysis" patented technology

The invention discloses a gas water heater provided with a cold water inlet pipe and a hot water outlet pipe. The gas water heater comprises a shell, a catalysis combustor, a preheating combustor anda heat exchanger. A combustion chamber is formed in the shell. The catalysis combustor is arranged in the combustion chamber. The preheating combustor is arranged in the combustion chamber and is adjacent to the catalysis combustor. When the preheating combustor conducts combustion, the preheating combustor acts on the catalysis combustor, and the catalysis combustor is heated. One end of the heatexchanger communicates with the cold water inlet pipe, and the other end of the heat exchanger communicates with the hot water outlet pipe. The heat exchanger is used for absorbing heat generated dueto combustion of the preheating combustor and combustion of the catalysis combustor and conducting heat exchange on the absorbed heat and water in the heat exchanger. The gas water heater is simple and compact in structure, the energy utilization rate can be sufficiently improved, and harmful substance emission is reduced.

The invention discloses a 1,3-1,4-beta-glucanase mutant, and belongs to the fields of gene engineering and enzyme engineering. Lysine in the 20th position, 117th position and 165th position of 1,3-1,4-beta-glucanase from Bacillus terquilensis mutates through an overlapping extension PCR method to form serine in order to obtain single mutants K20S, K117S and K165S respectively. The above three mutation sites are integrally mutated to obtain a K20S/K117S/K165S triple mutant enzyme. Four mutant enzymes have higher catalysis activity and better thermal stability. Compared with wild enzymes, the above mutant enzymes are in favor of realizing the industrial application.

The invention discloses a method for controlling the appearance and defects of molybdenum disulfide by temperature. The method is characterized in that by using MoO3 powder added with 10% NaCl as a Mosource precursor and sulfur powder as sulfur source precursor, two-dimensional MoS2 samples grow by a chemical vapor deposition method. A grown substrate is buckled upside down directly above a quartz boat loaded with the Mo source precursor, and is heated and grows at different temperatures to obtain two-dimensional MOS2 samples with different appearances and boundary defect densities. At a lower growth temperature, because the precursor molecules of MOS2 have a short migration distance on the substrate, the grown MOS2 samples are snowflakes containing more boundary defects; and with the increase of the temperature, the appearances of the MOS2 samples are gradually transited to leaf shapes and triangle shapes, and the boundary defects also decrease rapidly. Controlling the appearances and defects of molybdenum disulfide is of great significance to promote the application of the molybdenum disulfide in the field of catalysis.

The invention discloses a method of controllably preparing GaON films with different oxygen and nitrogen contents by means of an atomic layer deposition one-step method. The method comprises the following step: by means of a PEALD preparation technique, introducing reaction gas in proportion into a reaction chamber by taking a precursor trimethyl gallium as a gallium source and NH3 and O2 plasma as a nitrogen source and an oxygen source and regulating the flow ratio of NH3 and O2 gas to prepare the high quality GaOH films with certain oxygen and nitrogen contents on a substrate. The GaON filmprepared by the method has an atomic scale controllable thickness and uniformity of a large area. As the oxygen and nitrogen contents are controllable and the gap is adjusted, the prepared GaON film has good a photoelectric property and has important scientific value and a wide application prospect in the fields of sensors, photoelectric detection, micro-electronic apparatuses, photoelectric catalysis, energy sources and the like.

Polyol and fatty acid is reacted under the catalysis of metal oxide to obtain polyol fatty acid ester. The polyol is glycol or polyglycol; the fatty acid is lauric acid, palmitic acid, stearic acid, oleic acid, etc.; and the esterification catalyst is metal oxide. The production process is simple, reliable and stable. During the process, the metal oxide is first reacted with fatty acid to produce fatty acid soap, and the fatty acid soap then catalyzes the esterification. The reaction is completed under the homogeneous phase condition and the fatty acid soap, normally as the processing assistant for rubber, needs no separation from the product. The product of the present invention is used as dispersant for mixing rubber to raise the inherent quality and outer appearance of rubber product.

The invention relates to technology of a water-based combustion-supporting straw particle boiler-kiln universal burner with fuels such as coal, gas and oil. Specially-shaped fireproof ribbed bricks are built in a square-tank water-cooling-wall machine body to form a plurality of pairs of two-side square-tank hearth backfire collision hearth structures, two sides of a central hearth are provided with a square-tank hearth, a fire collision hearth, a fire outlet, a special boiler material covering cap system, an extension hopper, a streamline pushing curve, a streamline extension pipe, a burner body and a cooling triangular comb, mixed application of multiple fuels or replacement of a servo fed material can be performed, the air supply coefficient of a boiler adopting water and magnesium steam water-based supported combustion technology to completely or not completely substitute for a traditional air supported combustion technology is far less than 1, and thus the ultra-efficient energy-saving and environment-friendly boiler-kiln universal burner fulfills six purposes of no air consumption, water-based combustion supporting, ultra-efficient energy conservation, no generation of NOx, desulphurization and decomposition and solidification of carbon dioxide under the catalysis of steam of water, magnesium, etc.

The invention discloses a system for removing tritium from high-humid air. The system comprises a tritium removing unit and a water collecting unit; the tritium removing unit comprises a gas booster pump, a flow controller, an inner pipe of a drying pipe, a catalytic reactor, an adsorber and a dew point meter, wherein the gas booster pump, the flow controller, the inner pipe, the catalytic reactor, the adsorber and the dew point meter are sequentially connected through a pipeline; the water collecting unit comprises a rotor flowmeter, an outer sleeve of the drying pipe, and a water collector,wherein the rotor flowmeter, the outer sleeve and the water collector are sequentially connected to an outlet of the adsorber; and the tritium-containing air containing more water enters the tritium removing unit, then sequentially passes through the gas booster pump, the flow controller, the inner pipe of the drying pipe, the catalytic reactor, the adsorber and the dew point meter, and then is discharged, and the field air discharged from the outlet of the adsorber sequentially passes through the rotor flowmeter, the outer sleeve of the drying pipe and the water collector and then is collected. The tritium is cleared in situ through tritium oxygen catalysis and gas-liquid separation technologies, the tritium component in the high-humid air can be removed in time under the high-humid background air condition, and a tritium-involving environment is effectively protected.

The invention relates to the technical field of waste gas purification, and particularly relates to an efficient waste gas purification all-in-one machine utilizing photo-oxidation catalysis and activated carbon adsorption. The machine comprises a photo-oxidation catalytic tank, wherein a purifying tank is arranged on one side of the photo-oxygen catalytic tank, a cavity is formed in the photo-oxygen catalytic tank, a plurality of lamp holders are arranged at the bottom of the cavity, a zigzag glass tube is arranged between every two lamp holders, the two ends of each zigzag glass tube penetrate through the two sides of the photo-oxygen catalytic tank, and the air outlet end of each zigzag glass tube further penetrates through one side of the purifying tank and extends into a purifying cavity; circular grooves are formed in the lamp holders, high-energy high-ozone UV lamps are arranged in the circular grooves, and a plurality of layers of efficient adsorption activated carbon plates are arranged in the purifying cavity. According to the invention, the high-energy high-ozone UV lamps, the zigzag glass tubes and the high-efficiency adsorption activated carbon plates are arranged, sothat ultraviolet light beams emitted by the high-energy high-ozone UV lamps can crack waste into harmless low-molecular-weight compounds, the efficient adsorption activated carbon plates can filter dust particles, and the problems that waste gas treatment in a factory is not thorough enough, a small amount of waste gas and a small amount of dust particles are contained in exhausted gas, and the environment is polluted are solved.

The invention discloses a rice growth promoting method for synthesizing artificial humic acid under the catalysis of nano ferric oxide, and belongs to the field of nano agriculture. The method for synthesizing the artificial humic acid by catalyzing the waste biomass by using the transition metal comprises the following steps: adding a mixed solution of alkali, a transition metal catalyst and water into a biomass raw material, and carrying out catalytic reaction at 160-250 DEG C for 6-48 hours; and after the reaction is finished, carrying out solid-liquid separation on the reaction product, and filtering the obtained liquid to obtain the artificial humic acid. The artificial humic acid catalytically synthesized by adopting the nano transition metal can promote the rice to germinate earlier and faster, the germination rate is increased by 15%, the growth of the rice can be effectively promoted, the root activity is increased by 166.76%, the net photosynthetic rate is increased by 72.08%, the absorption of the rice root to water and nutrients and the transfer of the nutrients can be improved, and the yield of the rice is increased. The capability of resisting oxidative stress and salt stress of the rice is improved. Preparation is simple, operation is convenient, and application and popularization are easy.

The invention discloses a side chain type amino silicone oil emulsion and a preparation method thereof, and the preparation method comprises the following steps: under the protection of inert gas, carrying out reduced pressure reaction on linear hydroxyl silicone oil and an amino-alkyl coupling agent under the catalysis of TMAH, and then carrying out heating treatment under the reduced pressure condition to obtain side chain type amino silicone oil; the preparation method comprises the following steps: emulsifying side chain type amino silicon oil to obtain the side chain type amino silicon oil emulsion; according to the preparation method disclosed by the invention, through a specific preparation process and a specific emulsification method, the prepared side chain type amino silicone oil emulsion has excellent transmittance and stability, the transmittance of the side chain type amino silicone oil emulsion can be up to 97%, and meanwhile, the side chain type amino silicone oil emulsion has excellent stability.

The invention discloses a copper nanoparticle/pyrocatechol violet/carbon nanotube-modified electrode and an application thereof. Pyrocatechol violet is electrodeposited on a single-walled carbon nanotube-modified glassy carbon electrode by cyclic voltammetry, moreover, copper ions are chelated onto the glassy carbon electrode by in-situ electrochemical reduction, so that copper nanoparticles are formed, and thereby the modified electrode is obtained. Because of the synergistic effect of the copper nanoparticles, the pyrocatechol violet and the carbon nanotubes in the copper nanoparticle/pyrocatechol violet/carbon nanotube-modified electrode prepared by the invention, oxidation-reduction is kept in pyrocatechol violet electrodeposition which plays a synergistic role in the electrochemical reduction of hydrogen peroxide by the modified electrode, and thereby the analytical performance is remarkably enhanced; and moreover, the modified electrode has good oxidation-reduction, and has a wider range of linear catalysis on hydrogen peroxide at -0.25V.

The invention relates to the field of medical intermediates, and particularly discloses a production process of 4-chloropyrrolo[2,3-d]pyrimidine, which comprises the following steps: S1, adding a compound I and a compound II into a mixed solvent I, and carrying out heating reaction under the catalysis of alkali I to obtain a compound III; and S2, adding sodium alkoxide I into an alcohol solvent II, adding a compound IV and a compound III for a heating reaction, and adding an organic solvent III, an organic solvent IV and a compound V for a heating reaction, so as to obtain a 4-chloropyrrolo [2, 3-d] pyrimidine crude product, wherein the compound I is shown in the specification, the compound II is shown in the specification, the compound III is shown in the specification, the compound IV is formamidine acetate, and the compound V is POCl3. According to the preparation method, he bromo-acetaldehyde dimethyl acetal and ethyl cyanoacetate are subjected to a reflux reaction, and prepared ethyl 2-cyano-4,4-methoxybutyrate and the formamidine acetate are subjected to one-pot chlorination reaction, so that the reaction period is greatly shortened.