62results about How to "Good performance repeatability" patented technology

The synthesis process of propylene carbonate or vinyl carbonate includes adding urea, propylene glycol or ethylene glycol in the molar amount of 1-100 times that of urea and solid alkali in the molaramount of 0.001-10 times that of urea into the reactor and reaction at the temperature of 100-200 deg.c and vacuum degree 50-600 mmHg or nitrogen blowing in the flow rate of 1-1000 ml / ml cat. min for0.5-20 hr. The present invention has the advantages of repeatable catalyst performance, material converting rate near the theoretical number, high product selectivity, less side product, etc.

The invention discloses a catalyst for synthesising methanol by hydrogenation of carbon dioxide. The catalyst is composed of oxides with the following molar ratio based on metal: 20-50% of La, 0-10% of M, 15-35% of Cu, and 2-15% of Zn, wherein M is one or more of Zr, Y, K, Ag, Ce, Pd, Mn, Mg, Fe, Co, Ni or Cr. The catalyst disclosed by the invention has the advantages that preparation is simple, operation is easy, catalyst performance repeatability is good, industrial amplification is easy to realize, and reaction conversion rate and reaction selectivity are high.

The invention discloses a catalyst for synthesizing methanol through CO2 hydrogenation, comprising Cu, Zn, Al, X, halogen and oxygen elements, oxides and halides, wherein the molar ratio of [Cu+Zn+MA] to [Al+Mb] is 2-18; the molar ratio of Cu to Zn is 0.5-5; the molar ratio of MA to [Cu+Zn] is 0-5; the molar ratio of MB to Al is 0-9; the molar ratio of halogen to Al is 0.05-5; MA and MB cannot be 0 at the same time; MA represents a mono-valent or divalent metal ion in X; MB represents a trivalent and / or tetravalent metal ion in X; X is one or a combination of more elements of Li, K, Mg, B, Ga, In, transition metal elements and rare-earth metal elements. The catalyst has the advantages of high carbon dioxide conversion rate, good methanol selectivity and high methanol yield.

The invention discloses a preparation method of a high transparent PVC (Polyvinyl Chloride Resin) special resin with high ageing whiteness and favorable heat resistance performance. The preparation method comprises the following steps of: cleaning and washing a polymerizing kettle, coating a kettle antisticking agent, adding deionized water, a dispersoid agent, a compound peroxide initiator, a chain transfer agent and a polymerization stabilizer, vacuumizing to a certain vacuum degree, adding a vinyl chloride monomer, coldly stirring, then raising temperature to the reaction temperature, timing when polymerization starts, adding a compound heat-resistant terminator after the pressure of the polymerizing kettle is reduced to a process control point, continuously stirring, discharging slurry and drying to obtain the PVC resin. The prepared PVC resin has high ageing whiteness and favorable heat resistance performance and transparency.

This is about a kind of catalyst to make complexes ether of low carbon, whose weight rate is: Mo: 20--40%, soil: 15--30%, Ma: 5--20%, K: 5--15%, S: 20--40%. Take the changing S reactivity to the S hua ammonia solution and Mo acid ammonia, add heavy Acetic acid, filter, dry, and make S dai Mo acid ammonia ether solution: make Ma salt ether solution, mixing them and take supersonic reaction, then get the precipitation, wash, dry and mix with K salt, crash, fire after taking protection air, add soil, mix, press to sheet, shape. The way of the invention is simple, easy to operate, high activity, high choosing ability of ether and low choosing ability of Hydrocarbon.

A process for synthesizing methyl aminoformate includes the catalytic reaction between methanol, urea and catalyst at 120-200 deg.C, under 0.1-3 MPa for 0.5-20 hr and condensing and recovering ammonia gas. Its advantages are low cost and high selectivity to product.

A nanometer ceramic material dopant, medium material of ceramic capacitor and their production are disclosed. The formula of the dopant consists of aA.bB.cC.dR2 O3.eSiO2; A contains Na2O; B contains one or multiple of MgO and CaO; C contains one or multiple of MnO2 and Co3O4; R contains one of multiple of Y, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, among them a, b, c, d and e are coefficient, by computing mol%, 0<=a<=10%, 0<=b<=25%, 0<=c<=15%, 20%<=d<=60%, 10%<=e<=50% and b and c can't be zero at same time. Its advantages include large capacity, adjustable material formula, low sintering temperature, less medium loss, high dielectric constant and better reliability.

Provided are a catalyst for room-temperature catalytic oxidation of formaldehyde pollutants and a preparation method and application thereof. Alumina monohydrate (AlOOH) is used as a carrier, precious metals Pt and Pd are supported on the AlOOH by adopting an impregnation method and the like, and the catalyst capable of conducting efficient catalytic oxidation on formaldehyde in the polluted air under normal pressure and room temperature into harmless carbon dioxide and water is obtained. The AlOOH carrier is prepared through direct calcination of aluminum hydroxide, and its preparation process is simple and repeatable, the surface area is larger, and lots of hydroxyl groups are produced. Nitrate is used as a precursor solution, the prepared Pt / AlOOH or Pd / AlOOH catalyst has higher dispersion degree of precious metals, and thus a more excellent room-temperature formaldehyde purification effect is obtained. Experimental tests show that the formaldehyde concentration is 80ppm in the air with the relative humidity RH of 0-80%, and the formaldehyde conversion rate of catalytic oxidation of the catalyst can be kept to 100% for a long time.

The invention discloses a catalyst for low-temperature CO catalytic oxidation and a preparation method of the catalyst. The catalyst for the low-temperature CO catalytic oxidation is of a core-shell structure, the core is Co3O4, the shell is CeO2-ZrO2, and the core and the shell contain following metal atoms in mole percent: 84-94 percent of Co, 5-10 percent of Zr and 1-6 percent of Ce. The preparation method comprises the following steps: preparing Co3O4 catalyst particles by adopting a parallel flow co-precipitating method; and then loading CeO2-ZrO2 shell layers on the surfaces of the Co3O4 catalyst particles by adopting a sol-gel method to obtain the catalyst for the low-temperature CO catalytic oxidation. After being activated by inert gas, the prepared catalyst for the low-temperature CO catalytic oxidation is extremely high in catalytic activity and high in stability; the required temperature for complete CO oxidation is smaller than or equal to -65 DEG C.

The invention discloses a copper based catalyst used for hydrogenating carbon dioxide to synthesize methanol, and a preparation method and an application thereof. The preparation method of the catalyst comprises the following steps: 1, processing a zinc salt, an aluminum salt, a zirconium salt and a stabilizer to prepare a first solution, or processing the zinc salt, the aluminum salt and the zirconium salt to prepare a second solution; 2, processing carbonate and hydroxide to prepare a third solution; 3, processing a copper salt to prepare a fourth solution; 4, processing the first solution and the third solution to form a first precipitation solution, or processing the second solution and the third solution to form a second precipitation solution; 5, adding the fourth solution to the first precipitation solution to form a third precipitation solution or adding the fourth solution to the second precipitation solution to form a fourth precipitation solution, ageing after Cu in the precipitation solution precipitates, and washing; and 6, drying, and calcining. The catalyst contains 30-50% of Cu, 20-40% of Zn, 10-20% of Al, and 5-20% of Zr. The catalyst is used for a reaction for hydrogenating carbon dioxide to synthesize methanol.

The invention discloses a preparation method of an activated carbon-supported cobalt-nickel alloy material and electrochemical application of the preparation method. The preparation method comprises the following steps: dissolving a cobalt source and a nickel source with a molar ratio of 1:0.1-10 into distilled water, so as to obtain clear mixed solution; adding activated carbon into the clear mixed solution, forming slurry after adsorption is saturated and performing heat treatment on the slurry, so as to obtain the activated carbon-supported cobalt-nickel alloy material. The activated carbon-supported cobalt-nickel alloy material can be applied in the field of electro-catalytic water decomposition or the field of electro-catalytic oxidation of low molecular weight organic matters. The activated carbon-supported cobalt-nickel alloy material prepared by the invention has excellent performances of hydrogen and oxygen evolution through electro-catalytic water decomposition, and the efficiency of producing hydrogen through electro-catalytic water decomposition is further improved when the organic matters are synthesized through efficient electro-catalytic oxidation, therefore, the preparation method has potential application prospect in the fields of electro-catalytic organic synthesis and hydrogen energy sources.

The invention relates to a preparation method of a MnOx-CeO2 composite semiconductor catalyst which has the function of low-temperature photo-thermal concerted catalytic purification of VOCs and the light-assisted self repairing function. The chemical formula of the MnOx-CeO2 composite semiconductor catalyst is Ce<1-a>MnaO<2-Delta>, wherein a is larger than 0 and smaller than 0.7; the method comprises the following steps: (1) weighing Ce salt and KMnO4, and dissolving in an alkaline solution to obtain a mixed suspension solution; (2) sealing the mixed suspension solution to have a hydrothermal reaction to obtain a precipitate; (3) separating the prepared precipitate, washing, drying and then grinding to obtain the MnOx-CeO2 composite semiconductor catalyst.

The invention discloses a preparation method of a high-compaction-density lithium manganese iron phosphate / carbon composite positive electrode material. The chemical general formula of the material is LiMnxFeyPO4 / C, wherein x is more than or equal to 0.5 and less than or equal to 0.9, and x + y is equal to 1. The preparation method comprises the following steps: diluting phosphoric acid for later use, adding a manganese source, an iron source, a dispersing agent and deionized water into a sealable container, and introducing shielding gas; adding diluted phosphoric acid into the sealed container, aging until the pH value is 2.0-5.0, and uniformly nucleating; cleaning the formed precipitate, drying in vacuum, and sintering for the first time at high temperature to form spherical particles A; preparing a solution from lithium hydroxide monohydrate, adding the spherical particles A into the solution, performing spray drying, and performing high-temperature secondary sintering to obtain spherical particles B; and preparing a glucose solution, adding the spherical particles B into the glucose solution, performing spray drying, and performing high-temperature third sintering to obtain the nano spherical lithium manganese iron phosphate / carbon composite material. The electrochemical performance and the compaction density of the material are greatly improved.

The invention provides a solid base catalyst for synthesizing dimethyl carbonate through a transesterification method. The components are Ca-Al-O-X, wherein the mole content of Ca ranges from 15% to 35%, the mole content of Al ranges from 5% to 30%, the mole content of X ranges from 0.1% to 10%, the balance is O, and X is CO3<2-> or NO3<-> or F<-> or Cl<-> or Br<->. The solid base catalyst has the advantages that the use temperature is low, the conversion rate of propylene carbonate under the low-temperature condition is high, and the yield of dimethyl carbonate is high.

The invention relates to a catalyst for preparing carbon monoxide by decomposing carbon dioxide, which is a composite metal oxide obtained by doping Mg and Ca in a cerium-zirconium solid solution. The chemical composition of the catalyst is expressed by the following general formula: Ce0.8-xZr0.2MxO2-x, wherein x equals 0.02-0.1, M is doping metal Mg or Ca, and x is the molar fraction of the doping metal. The catalyst disclosed by the invention has the advantages of high activity, high thermal stability and long service life.

The invention discloses a preparation method of an efficient sodium-based solid decarburization adsorbent. Pre-treatment including washing, roasting and grinding is conducted on a gamma aluminium oxide carrier; an incipient-wetness impregnation method is adopted, wherein the carrier is impregnated in dopant impregnation liquid with the electrolyte cation concentration of 0.1-2.0 mol / L for 6-8 hours, and then the carrier is subjected to drying, roasting and grinding for standby use; a modified carrier obtained in the last step is impregnated in an isovolumetric sodium carbonate solution with the concentration of 0.8-3.8 mol / L for 6-8 hours and subjected to drying, roasting and grinding for standby use; furthermore, a modified adsorbent is impregnated in another sodium-based amino secondaryactive component solution for 6-8 hours and subjected to drying, roasting and grinding, and finally, the target adsorbent is obtained. The adsorbent is mainly applied to thermal power plant tail smokecarbon dioxide purification, and the adsorption / desorption conditions are mild; meanwhile,the adsorbent has the advantages that the preparation method is simple, raw materials are cheap and easy to obtain, large-scale production is feasible, the adsorbent is stable in structure, all components are evenly dispersed, and the decarburization performance is efficient and stable and the like.

The methanol synthesizing catalyst has the molar composition of: Zr 40-60%, Cu 20-40%, MA 10-20% and Ni 1-30%, where MA is alkali metal, alkali earth metal or transition element(s). During the preparation, zirconium hydroxide and the nitrates of the other elements are dissolved in distilled water to form mixed solution of 5-30 % concentration; coprecipitation with sodium carbonate at 60-90 deg.c while stirring and maintaining pH 9-12; washing the precipitate with distilled water until no chlorine oil; soaking with the citrate, carbonate, oxalate or nitrate of MA to add MA as assistant; dryingat 80-160 deg.c, roasting at 200-750 deg.c and crushing to 20-40 mesh. The catalyst has high mechanical strength and low cost.

The invention provides a high-threshold voltage gallium nitride enhanced transistor structure and a preparation method thereof and relates to semiconductor technology. The high-threshold voltage gallium nitride enhanced transistor structure comprises a substrate, a GaN layer, an AlGaN layer and an insulating gate dielectric layer from bottom to top and is characterized in that the insulating gate dielectric layer comprises an insulating tunnel layer, a fixed charge layer and an insulating cap layer, wherein the fixed charge layer is arranged above the insulating tunnel layer or is embedded at the upper part of the insulating tunnel layer; the insulating cap layer is arranged above the fixed charge layer; and gate metal is arranged above the insulating cap layer. The high-threshold voltage gallium nitride enhanced transistor structure has the beneficial effects that compared with other technology for manufacturing an enhanced GaN field effect transistor, the controllability of the preparation process is good, and the performance repeatability of researched and developed devices is good; and a researched and developed GaN MlSHEMT device has the advantages of good performance, large threshold voltage, large biggest source leakage saturation current density, small gate current leakage and wide operating voltage range, and the research and development demands of a GaN integrated circuit can be fully satisfied.

The invention relates to a catalyst for hydrogen production by methanol steam reforming as well as a preparation method and application of the catalyst. The catalyst is a porous catalyst prepared under the guidance of activated carbon serving as a hard template agent, and comprises Cu and ZrO2, and in metal elements of the catalyst, the mole% of Cu is 5-35%, and the mole% of Zr is 65-95%; a hard template made of the activated carbon is used, the method comprises the following steps: loading a copper component and a zirconium component in pore channels on a skeleton of the activated carbon by virtue of a coprecipitation method, then roasting in air to remove the activated carbon to form a porous Cu / ZrO2 catalyst, and then removing copper species gathered on the surface of the porous Cu / ZrO2catalyst by virtue of acid pickling to expose a sufficient copper-zirconium interface. Compared with the prior art, the catalyst disclosed by the invention shows high catalytic activity and stabilityafter being reduced in an H2 atmosphere, and the reaction conditions are mild, the conversion rate of methanol at 230 DEG C exceeds 95%, and the selectivity of a byproduct CO is lower than 0.5%.

Provided are a catalyst for room-temperature catalytic oxidation of formaldehyde pollutants and a preparation method and application thereof. Alumina monohydrate (AlOOH) is used as a carrier, precious metals Pt and Pd are supported on the AlOOH by adopting an impregnation method and the like, and the catalyst capable of conducting efficient catalytic oxidation on formaldehyde in the polluted air under normal pressure and room temperature into harmless carbon dioxide and water is obtained. The AlOOH carrier is prepared through direct calcination of aluminum hydroxide, and its preparation process is simple and repeatable, the surface area is larger, and lots of hydroxyl groups are produced. Nitrate is used as a precursor solution, the prepared Pt / AlOOH or Pd / AlOOH catalyst has higher dispersion degree of precious metals, and thus a more excellent room-temperature formaldehyde purification effect is obtained. Experimental tests show that the formaldehyde concentration is 80ppm in the air with the relative humidity RH of 0-80%, and the formaldehyde conversion rate of catalytic oxidation of the catalyst can be kept to 100% for a long time.

The invention discloses an electron thermal radiation detection meter and a producing method thereof. The method includes 1, coating on an SiO2 liner to obtain a PMMA layer; performing electron beam exposure and development on the PMMA layer sequentially to obtain an electrode pattern, and then evaporating an electrode; 2, removing the PMMA layer from the SiO2 liner; transferring a boron nitride-disordered grapheme film, namely a composite film formed by sequentially stacking a boron nitride film and a disordered grapheme film, on the SiO2 liner; arranging the disordered grapheme film on the end face of the SiO2 liner with the evaporated electrode; 3, coating on the boron nitride-disordered grapheme film to obtain a PMMA layer, then obtaining a structure corresponding to the electrode through electron beam exposure and etching sequentially, and obtaining the electron thermal radiation detection meter. Compared with an existing grapheme thermal radiation detection meter produced by using superconducting tunnel junctions, the electron thermal radiation detection meter can operate without extreme low temperature but with an ordinary liquid helium refrigerator, cost is reduced, and operation is very simple.

A noble metal modified Cu / ZrO2-based catalyst for synthesizing methanol contains proportionally Cu, Zr and Pd or Ag. It is prepared through mixing the mixed solution of copper nitrate and zirconium oxychloride with the solution of sodium carbonate, stirring, codepositing, keeping pH=9-11, washing with distilled water, drying, calcining, cooling, tabletting, pulverizing, immersing in the solution of palladium (or silver) nitrate, and infrared baking.

The invention relates to a catalyst for preparing furfuryl alcohol from furfural through gas-phase hydrogenation. The catalyst contains copper oxide, chromic oxide, potassium carbonate and silicon dioxide, the molar ratio of copper oxide to chromic oxide is (1-5):1, the molar ratio of copper oxide to potassium carbonate is (20-80):1, and the molar ratio of copper oxide to silicon dioxide is (1-20):1. The invention further relates to a preparing method of the catalyst for preparing furfuryl alcohol from furfural through gas-phase hydrogenation and the catalyst prepared through the method and furthermore relates to a method of preparing furfuryl alcohol from furfural through gas-phase hydrogenation. The catalyst used for preparing furfuryl alcohol from furfural through gas-phase hydrogenation and prepared through the method is high in activity and selectivity, high in performance repeatability, easy to apply industrially in a scale-up mode, the preparing method is simple and easy to operate, and waste water polluting the environment is avoided in the catalyst preparing process.

The invention discloses a ladybug attractant of an aphid natural enemy. The attractant comprises ladybug sex pheromone, synomone and kairomone; the synomone is aphid-induced plant volatile matters; and the kairomone consists of aphid warning pheromone, aphid body surface extracts and aphid honey dew volatile matters. The ladybug attractant has good attraction effects, good effect repeatability andhigh stability in both laboratory and field experiments, and has broad spectrum for beneficial ladybugs such as coccinella septempunctata, harmonia axyridis, propylaea japonica and the like.

The present invention belongs to the field of electronic material technology, and especially relates to one kind of ceramic material for capacitor. The present invention provide one kind of ceramic material dopant in nanometer level, and the dopant has the composite oxide aSi+bA+cD+dR as mai component, where an is acceptor element Mg or Mn; D is one or several of V, Gd, Sm, Nd and Pr; R is one or several of rare earth elements Ho, Dy, Y, Yb and Er; and a, b, c and d are molar coefficients, an is 10-70 %, b is 10-40 %, c is 10-40 % and d is 10-40 %.

The invention relates to a large-overload stop structure of a diaphragm type pressure signal device, and belongs to aviation airborne technologies. The large-overload stop structure includes a stop plate with a step profile, and a sensing portion of the pressure signal device is composed of a ripple diaphragm and the stop plate; peaks of the ripple diaphragm are in one to one correspondence with steps of the stop plate, and heights of the steps of the stop plate correspond to displacement values of the peaks in the working pressure state of the ripple membrane. The large-overload stop structure has the advantages of compact size, low weight and good stop effect, the overload born by a diaphragm can be removed fully, the overload stress is reduced, and the fatigue life of the diaphragm is improved.

The invention relates to a preparation method for improving the surface hydrophilicity of nanometer polyethylene terephthalate (PET) films, which comprises the following steps that: the nanometer PET films with the cleaned surfaces are placed into a radio frequency plasma generator, the glow discharge is carried out at room temperature under the condition of argon gas or mixed gas of argon gas and helium gas, the work vacuum degree is controlled at 20 to 45Pa, the time is controlled at 3 to 5.5min, the surfaces of the modified nanometer PET films are exposed in the air to carry out the ageingtreatment for 24 to 84 hours, then, the nanometer PET films are placed into the radio frequency plasma generator, the glow discharge is carried out at room temperature under the condition of argon gas or mixed gas of argon gas and helium gas, the work vacuum degree is controlled at 10 to 35Pa, and the time is controlled at 5 to 7.5min. The uniformity of the surface hydrophilicity of the PET filmstreated by the method is good, and the method has the characteristics that the performance repetitiveness is good, the preparation process is simple, and the production efficiency is high.

The invention provides a thickness correcting method for a millimeter wave antenna housing. The thickness correcting method is characterized in that firstly, after resin is dissolved, glass cloth is coated with the resin, glass cloth prepreg is manufactured, or after the resin is dissolved, quartz cloth is coated with the resin, and quartz cloth prepreg is manufactured; then, an antenna housing blank is formed through a female die and autoclave molding technology, then the thickness of the wall of the housing is measured, multiple layers of quartz cloth prepreg are laid to enable the thickness of the wall of the housing to reach the regulated wall thickness, and finally a correction layer is cured. The manufactured millimeter wave antenna housing does not need to be ground, the working intensity of manufacture personnel is lowered, the repeatability of product performance is good, and the wave-transparent percent of pass is increased.

The invention describes a preparation method of a simulated wood anti-sulfuration material for polyether polyurethane shoes. The simulated wood anti-sulfuration material is prepared by a chemical reaction of component A and component B . The component A is a mixture of polyether polyol A (functionality f equals 3, and OH equals 26-28mgKoH / g), polyether polyol B (functionality f equals 2, and OH equals 26-28mgKoH / g), polyether polyol C (GR-4110), a polyurethane crosslinking agent, a foam stabilizer, a foaming agent, a catalyst and the like; and the component B is a prepolymer of the polyether polyol B (functionality f equals 2, and OH equals 26-28mgKoH / g), 4,4-diphenyl diisocyanate (MDI) and polyphenylpolymethylene isocyanate (raw MDI).