706results about How to "Good reaction selectivity" patented technology

A catalyst that oxidizes carbon monoxide includes a bimetal consisting of platinum and a transition metal in a bimetallic phase that is loaded on γ-alumina support. The catalyst is manufactured by uniformly mixing a platinum precursor, a transition metal precursor, and γ-alumina (γ-Al₂O₃) in a dispersion medium to provide a mixture; drying the mixture; calcining the dried mixture; and reducing the calcined dried mixture. Since the catalyst that oxidizes carbon monoxide has high reaction activity even at low temperature and excellent reaction selectivity, and a methanation reaction and reoxidization do not occur, and the catalyst can effectively eliminate carbon monoxide in the fuel.

The invention discloses a load type sulfur-tolerant methanation catalyst, which is characterized by taking a main metal M as an active component, a second metal M1 as an auxiliary agent and S as a carrier, and consisting of the metal M, the metal M1 and the carrier S, wherein the mass ratio of the M1 to the M to the S is 0.01-39:1-30:0.01-90; the main metal M is one or more of Mo, W and V; the second metal M1 is one or more of Fe, Co, Ni, Cr, Mn, La, Y or Ce; and the carrier S is SiO2, ZrO2, Al2O3, MgO or TiO2. The load type sulfur-tolerant methanation catalyst is prepared by a sol-gel method. The metallic carbide catalyst prepared by the method has the advantages of low cost, high specific area, small particles, high methane selectivity and better sulfur tolerance when used for CO hydrogenation methanation reaction, and the like.

The invention relates to a nanocrystal metal oxide composite electrode and a method for preparing the same. The electrode is suitable for a seawater electrolysis device for preventing the contamination of sea creature and used for electrolytic production of sodium hypochlorite, cathode protection and other electrochemical engineering; a main structure of the electrode comprises a substrate, an anticorrosive antipassivated middle layer and a surface activity layer, wherein the substrate is metal titanium; the purity of the metal titanium is over 99 percent; the middle layer is iridium-tantalum or iridium-tantalum-tin oxide; the surface activity layer is ruthenium-iridium-tin metal oxide; a process for preparing the electrode adopts a sol-gel method and comprises three process steps of the pretreatment of the substrate, the preparation of the anticorrosive antipassivated middle layer and the preparation of the surface activity layer; and the electrode has the characteristics of even compositions, difficulty for burning loss, fine crystal grains, simple preparation process, controllable process and the like.

The invention relates to the making of a solid super strong acid using dual hydrolysis compounded acidic oxide as the center. In this way, it can realize high degree diffusion, significantly improved acid, activeness and option with reduced cost.

Provided is a curable coating composition comprising a reactive compound having one or more structures of the formula:

wherein X is a primary carbamate group, Y is a hydroxy or halide group, n is an integer of 2 or more, n′ is an integer of 1 or more, and R₀, R₁, R₂, R₃, R₄ and R₅ may be H or a group selected from alkyl groups, aliphatic groups, cycloaliphatic groups, aromatic groups and mixtures thereof, with the provisos that at least one R₁ or R₂ group is selected from the group consisting of aliphatic groups, cycloaliphatic groups, aromatic groups, and mixtures thereof, and in substantially all structures primary carbamate group X is attached to a carbon atom having a lower degree of substitution than a carbon atom to which functional group Y is attached.

The invention belongs to the chemical technical field and particularly relates to a supported nano Au catalyst for preparing crotyl alcohol by crotonic aldehyde selective hydrogenation and a preparation method thereof. The catalyst is prepared by using mesoporous titanium dioxide microballoons having core-shell structures as the carrier and loading the active constituents, nano Au, to the titanium dioxide microballoons by the deposition-precipitation method. The catalyst has the characteristics that the active constituents are highly dispersed, and the mol ratio of the titanium dioxide to the active constituents is 23.0-305.7. Compared with the nano Au catalyst supported by the commercial titanium dioxide carrier P25, the Au/TiO2 microspherical catalyst shows higher selectivity of target products in the reaction of preparing crotyl alcohol by crotonic aldehyde selective hydrogenation, thereby having important industrial application value.

The invention discloses a high-viscosity modified asphalt material. The asphalt material is prepared from the following raw materials in parts by mass: 100 parts of matrix asphalt, 4-7 parts of a thermoplastic elastomer, 4-10 parts of waste rubber powder or an ethylene-vinyl acetate copolymer, 1-3 parts of a plasticizer, 2-4 parts of thermoplastic resin, 3-5 parts of a solubilizer, 0.2-2 parts ofa stabilizer, 0.5-1.5 parts of a chemical modifier and 0.2-0.7 part of polypropylene glycol. Through the high-viscosity modified asphalt material, the storage stability of high-viscosity modified asphalt is improved; meanwhile, high-temperature viscosity of the high-viscosity modified asphalt is reduced; when the high-viscosity modified asphalt material is applied to mixing of asphalt mixture, themixing temperature is low; the high-viscosity modified asphalt material is easy to construct, low in cost and simple in preparation method.

The invention relates to a production method for ultra-low sulfur diesel oil; wherein, after mixed with hydrogen, straight-run atmosphere 3rd side cut distillate and (or) diesel oil heavy distillate enter(s) a first hydrogenation reaction zone and reacts under the action of hydro-upgrading catalyst and hydrofining catalyst; after mixed with the reaction effluent of the first hydrogenation reaction zone, straight-run atmosphere 2nd side cut distillate and (or) diesel oil light distillate enter(s) a second hydrogenation reaction zone and reacts under the action of the hydrofining catalyst; the reaction effluent of the second hydrogenation reaction zone is cooled, separated and distilled to obtain naphtha fraction and diesel products. The method provided by the invention can treat the diesel distillate with high sulfur, high nitrogen and high final boiling point, and under mild operating conditions, obtain clear diesel products with low content of sulfur and polycyclic aromatic hydrocarbons as well as high cetane number; meanwhile, the product quality can reach the indexes of the IV European emission standard.

The present invention belongs to the field of chemical technology and is especially one catalyst for anthraquinone hydrogenation process of preparing hydrogen peroxide and its preparation. The catalyst is obtained with some alloy and through active treatment with alkali solution and the alloy consists of Ni, Al and metal additive including one or several of Cr, Mo, W, Fe, Co, Cu and Zn. The catalyst is one kind of amorphous skeleton alloy catalyst prepared through high temperature melting of metal components, quenching stress to obtain alloy strip or scaly alloy, grinding, sieving and activation in alkali solution. Compared with traditional Raney Ni catalyst, the said catalyst has high anthraquinone hydrogenation activity and high selectivity.

The invention discloses a method for preparing sucrose-6-acetic ester by an enzymatic method, and belongs to the technical field of biocatalysis. In the method, in a non-aqueous medium tertiary butanol-dimethyl sulfoxide system, sucrose and vinyl acetate are catalyzed by lipase to perform a transesterification reaction so as to synthesize the sucrose-6-acetic ester. The method has the advantages of mild reaction condition, high reaction selectivity, single reaction product, high conversion rate, product safety and the like, and provides a novel feasible way for preparing the sucrose-6-acetic ester by a biological method.

The invention relates to a method for producing acrylic acid in one step by an oxydehydration reaction of glycerol in the presence of molecular oxygen. The reaction preferably carried out in gaseous phase in the presence of a suitable catalyst.

The invention relates to a method for denitrifying flue gas by using an amino reducing agent with high reaction activity. The method comprises the following steps of: spraying the amino reducing agent NR3 with high reaction activity into a denitrification reaction zone to ensure that the amino reducing agent and the flue gas are fully mixed, and reacting the amino reducing agent and NOX in the flue gas at the temperature of 350 - 800 DEG C to fulfill the aim of removing the NOX, wherein the denitrification efficiency can reach 70 to 90 percent. By the technology for denitrifying the flue gas by using the active amino reducing agent NR3, the disadvantages of a selective catalytic reduction (SCR) denitrification technology and a selective non-catalytic reduction (SNCR) denitrification technology are overcome, the reaction temperature is moderate, and the reaction selectivity is high. The method is applicable to the flue gas denitrification of multiple kinds of industrial boilers and industrial kilns and the treatment of automobile exhaust.

The innveiton discloses an electrochemical preparation method for 3-selenium aryl indole compounds, and belongs to the technical field of electrochemical organic synthesis. The preparation method comprises the following steps of: sequentially adding electrolyte, sodium iodide, indole compounds, diselenium aromatic ether compounds and an electrolytic solvent into an electrolytic tank without a diaphragm; inserting an anode and a cathode; stirring and electrifying, reacting under a constant-current condition; and after reaction is completed, carrying out organic extraction on an electrolyte solution by use of an organic solvent, and separating and extracting to obtain the 3-selenium aryl indole compounds. According to the electrochemical preparation method disclosed by the invention, an anode electrode is used as a platinum electrode or a net-shaped glass-state carbon electrode (RVC electrode), the cathode is a nickel net or a net-shaped glass-state carbon electrode (RVC electrode) or platinum, the yield is high, selectivity is good, and a metal catalyst does not need to be additionally added, so that a catalyst which is poisonous, dear and complex to prepare is effectively prevented from being used, a reaction system is simple and effective, and the electrochemical preparation method is environmentally friendly. The method disclosed by invention is operated under normal pressure at a normal temperature, and is simple and safe.

The invention relates to a sulfur tolerant catalyst suitable for slurry bed methanation. The catalyst adopts the main metal W as an active component, and on the basis the assistant metal W1 is added as an auxiliary agent, and the catalyst carrier is M. The catalyst is composed of, by mass: 2-40% of W, 0.5-35% of W1, and 50-97.5% of the carrier M. The sulfur tolerant catalyst provided in the invention has the advantages of high catalytic activity, long service life and high selectivity.

The invention discloses a preparation method of a bisphenol A epoxy ethane additive product. The method comprises the following steps of: dissolving 1 mole of bisphenol A and 0.001-0.1 mole of trialkylamine catalyst into 2-10 mole of ether solvent of which the temperature is 80-150 DEG C, and dropwise adding 2.05-2.30 mole of epoxy ethane which can be dissolved into 5-10 mole of n-hexane or n-heptane at the same temperature; and after reacting, slowly cooling to 0-30 DEG C for crystalizing, filtering, washing n-hexane or n-heptane, and performing vacuum drying to obtain 2 mole of bisphenol A-added epoxy ethane product of which the content is over 98 percent. After n-hexane or n-heptane is separated out of a crystalized mother liquor through normal-pressure or reduced-pressure rectification, the crystalized mother liquor can be taken as an ether solvent containing a catalyst for use in a next reacting process. The method has the advantages of high reaction selectivity, high yield, circular usability of the catalyst and suitability for industrial production.

The invention discloses a nickel-based catalyst as well as a preparation method and application thereof. The nickel-based catalyst has the following structural general formula: xNi.yCeAlO3.(100-x-y) Al2O3, wherein 1<=x<=20, 1<=y<=30. The catalyst is prepared by the following steps of: firstly, impregnating dried gamma-Al2O3 in a ceric salt solution at room temperature by using an incipient-wetness impregnation method, drying and roasting at the air atmosphere to obtain a modified carrier; then impregnating the modified carrier obtained at room temperature in a nickel salt solution by using the incipient-wetness impregnation method, drying and roasting at the air atmosphere to obtain a catalyst precursor; and finally, reducing the obtained catalyst precursor in hydrogen gas at 850-1050 DEGC. The catalyst provided by the invention has the advantages of strong coke resistance, good reaction stability and heat stability, high chemical and structural stability and the like and can be usedas the catalyst for preparing synthesis gas from methane.

The invention relates to an amino end-group triazine ring tree-shaped macromolecular adsorbent and a preparation method thereof. An anionic dye can be removed by fading dye wastewater. A tree-shaped macromolecule is a three-dimensional hyper-branched sequential novel macromolecule, so that the size, shape structure and functional group of the molecule can be strictly controlled and designed at molecular level, a dye molecule can be wrapped by a cavity structure in the macromolecule, and the removing purpose is achieved. The preparation method provided by the invention comprises the following steps of: dissolving cyanuric chloride in acetone; adding quadrol; stirring, reacting and then adding acid-binding agent; increasing temperature and reacting; and performing suction filtration on the product and then extracting and washing, thereby obtaining the amino end-group triazine ring tree-shaped macromolecular adsorbent. Under the influence of unsaturated bonds, the adsorbent disclosed by the invention is higher in reactivity and is easily subjected to nucleophilic substitution; the reaction selectivity is excellent; the condition is controllable and the method is conducted in steps; the adsorbent has physical and chemical adsorption for the anionic dye; and the adsorbent has the characteristics of higher relative molecular mass, so that the material usage is less and the cost is low.

A rotary machine type shock wave reactor suitable for thermal cracking of hydrocarbon-containing materials includes a casing, a rotor whose periphery contains an axial-flow blade cascade, and a directing rim, provided with at least two stationary vane cascades, adjoining an axial-flow rotor cascade, wherein the casing substantially encloses the periphery of the rotor and the directing rim. The cascades are configured to direct feedstock containing process stream to repeatedly pass the cascades in a helical trajectory while propagating within the duct between the inlet and exit and to generate stationary shock-waves to heat the feedstock. The axial-flow rotor cascade is configured to provide kinetic energy and add velocity to feedstock containing process stream, and the stationary vanes located downstream the rotor cascade are configured to reduce the velocity of the stream and convert kinetic energy into heat. The reactor may also process carbohydrate- and glyceride-based feedstock, and gaseous biomass matter.

The invention relates to a method for removing tar and coke during gasification and a method and a device for reforming combustible gas. The method is characterized in that: pyrolytic gasified gas is fed into a porous ceramic superadiabatic partial tar and coke oxidizing and removing device, and undergoes partial combustion at the front end of porous ceramics or inside a ceramic body; high temperature generated by the combustion carries out heat storage of a porous ceramic body; during the process, the tar inside a combustible gas undergoes pyrolysis in the superadiabatic environment of the porous ceramics so as to form small molecular gas, while alkane gas components inside the combustible gas undergo reforming reaction inside the porous ceramics; and the coke is completely oxidized inside the porous ceramics, thereby reaching the goal of removing the coke. The methods and the device have the advantages that: the tar and the coke are not attached to the porous ceramics or the surface of porous ceramic catalyst, and inactivation phenomenon caused by tar and coke attachment does not occur; moreover, the content of the tar and the coke in gas is almost equal to zero after the reforming, and the heat value of fuel gas is increased.

The invention discloses a catalyst for straight-run naphtha aromatization and a preparation method thereof. The catalyst for straight-run naphtha aromatization is prepared by modifying a nano ZSM-5 molecular sieve, preparing a carrier and preparing the catalyst. The catalyst is suitable for treating raw materials with high alkane content. And the catalyst has high catalytic activity and high arene selectivity. So the catalyst can be applied to more mild process conditions and can be applied to production of high-octane gasoline blending components and chemical raw materials like benzene, toluene, xylene, etc.

The invention discloses a novel catalyst and process of preparation for anthraquinone hydrogenation in hydrogen dioxide solution preparation, wherein the catalyst comprises nickel, boron, metallic additive M and carrying agent S, the specific surface is 200-1200 m2g-1, the active specific surface is 0.1-50 m2g-1. The catalyst preparing process comprises the steps of charging surface activator in the nickel-boron alloy preparation, producing mixture of mesopore or micropore molecular sieve and nickel-boron alloy, the conventional immersion or reducing agent immersion method can be employed to load the nickel-boron alloy onto the common carrying agent or mesopore and microporous molecular sieve.

The invention provides a method for synthesizing o-phenylenediamine from ortho-nitroaniline by virtue of catalytic hydrogenation. The method comprises the following steps: firstly, adding ortho-nitroaniline and a palladium-carbon catalyst into a high-pressure reaction kettle, introducing nitrogen to exhaust air in the kettle, and then introducing hydrogen to exhaust nitrogen in the kettle; secondly, heating and introducing hydrogen, performing catalytic hydrogenation reduction reaction under the conditions that the temperature is 110 DEG C and the pressure is 1.0MPa, reacting for 7-8 hours, then stopping introducing hydrogen, water-cooling, then filtering to recycle the catalyst, and collecting a filtrate after filtration to obtain o-phenylenediamine. According to the method provided by the invention, a raw material namely ortho-nitroaniline is subjected to direct hydrogenation without using a solvent, so that the consumption of the solvent can be greatly reduced, the after-treatment energy consumption can be saved, and large-sized solvent steaming equipment can be saved; and by adopting the method, a separation process can be simplified, the equipment investment, separation energy consumption, material consumption and environmental pollution can be reduced, and the system productivity and production safety can be improved.

The invention relates to a dipyridyl tetradentate ligand ruthenium complex as well as a preparation method of the complex and application of the complex to a reaction for hydrogenating ester compounds into alcohol compounds. A method for catalytically hydrogenating the ester compounds into the alcohol compounds by using the dipyridyl tetradentate ligand ruthenium complex is characterized by comprising the following steps: by taking 0.001mol% to 0.3mol% of the dipyridyl tetradentate ligand ruthenium complex based on the ester compounds, as a catalyst, adding 1mol%-10mol% of alkali based on the ester compounds, and catalytically hydrogenating the ester compounds into the corresponding alcohol compounds under the conditions that the temperature is 25-100 DEG C and the hydrogen pressure is 1-10MPa. The dipyridyl tetradentate ligand ruthenium complex is convenient to prepare, stable in structure and excellent in catalytic activity in hydrogenation reaction of the ester compounds. According to the preparation method, the shortcomings of requirements on high-temperature high-pressure reaction conditions and high catalyst consumption in an existing homogeneous or non-homogeneous catalytic hydrogenation system of the ester compounds are overcome, the catalyst consumption is low, the reaction conditions are mild, the reaction selectivity is good, and the economy and the safety of a production system are improved.

The invention discloses a hydrogenation catalyst. The hydrogenation catalyst is characterized in that a composite oxide which is modified by boron and consists of silicon dioxide and activated aluminum oxide is adopted as a carrier, palladium is adopted as a main active component, one component or multiple components of magnesium, calcium, lanthanum, cerium, manganese, iron, cobalt or nickel is/are adopted as an auxiliary active component (s); for the carrier, the weight ratio of the silicon dioxide (SiO2) to the activated aluminum oxide (Al2O3) is 1: (0.5-60), boron in the carrier accounts for 0.1-30% by weight, and palladium accounts for 0.01-10% by weight in the catalyst; the auxiliary active component in the catalyst accounts for 0-8% by weight. The catalyst is applied in the anthraquinone hydrogenation of fluidized beds, and the wear resistance, the activity and the selectivity can be obviously improved.