441 results about "Catalytic method" patented technology

A process for producing a producing a product of the formula:

R—CF═CHR¹

wherein R is F or CF₃ and R¹ is F when R is F and is H when R is CF₃ by reacting a reactant of the formula:

CF₃—R²

wherein R² is selected from

wherein R³ is H, F or Cl and R⁴ is H or Cl,

in the presence of a suitable catalyst, with a reducing agent selected from methane, methyl chloride and mixtures thereof, in a gas phase reaction.

The invention discloses a method of converting carbon dioxide to methanol and/or dimethyl ether using any methane source or natural gas consisting of a combination of steam and dry reforming, in a specific ratio to produce a 2:1 molar ratio of hydrogen and carbon monoxide with subsequent conversion of the CO and H₂ mixture exclusively to methanol and/or dimethyl ether. This method is termed the BI-REFORMING™ process. Dehydrating formed methanol allows producing dimethyl ether (DME) using any suitable catalytic method, including use of solid acid catalysts. When recycling formed water into the bi-reforming step the conversion of carbon dioxide with methane produces exclusively dimethyl ether without any by-product formation and complete utilization of hydrogen

A method for removing contaminants from an process stream that includes the use of reticulated material to filter the process stream. The reticulated material also facilitate process stream flow distribution in process units. The reticulated material can be packed with a void space between a substantial number of the reticulated material that can be varied to enhance filtration and flow distribution. The method of filtering also provides a method of removing contaminants leaving process equipment. The methods can be used on a variety of process streams and process equipment. The reticulated material can include ceramics, metallic materials, and chemical vapor deposition elements. The reticulated material can be of various shapes and sizes, and can also be catalytically active.

Catalysts and catalytic methods are provided. The catalysts and methods are useful in a variety of catalytic reactions, for example, the oxidative coupling of methane.

The invention describes catalysts, methods of making catalysts, methods of making a microchannel reactor, and methods of conducting chemical reactions. It has been discovered that superior performance can be obtained from a catalyst formed by directly depositing a catalytic material onto a (low surface area) thermally-grown alumina layer. Improved methods of conducting oxidative dehydrogenations are also described.

The invention relates to a catalytic method for the transalkylation/dealkylation of organic compounds, consisting in bringing a supply comprising organic compounds into contact with a catalyst containing a first zeolitic component that is selected from among: a) one or more zeolites having crystalline structure ITQ-13; b) one or more zeolites having crystalline structure ITQ-13, which are modified either by means of selectivation or with the incorporation of one or more metals, or both; and c) a mixture of a) and b). The invention also relates to a catalyst comprising one or more modified zeolites having crystalline structure ITQ-13.

The invention relates to a catalytic method for preparing dimethyl cabonate along with ethylene glycol. The invention is characterized in that ethylene oxide and carbon dioxide are used as raw materials to prepare ethylene carbonate under the catalysis of a composite catalyst; the composite catalyst and cyclic carbonate are not separated and are used to further catalyze the reaction of ethylene carbonate and methanol and prepare dimethyl cabonate and ethylene glycol. The synthesis method is characterized by high catalyst activity, low cost, long service life and the like.

The invention discloses a high heat insulation transparent SiO2 aerogel film material and a preparation method thereof, wherein the preparation method is realized by adopting a sol-gel technique to control the technological condition via using acid/alkali two-step catalytic method, and using hexamethyldisilazane (HMDS) to carry out organic hydrophobic modification on the surface of colloidal particles. The film material and the preparation method thereof are characterized in that the compound precursor sol has stable property, moderate viscidity and long gel time; the prepared aerogel heat insulation film not only has high porosity, low density and low hear conducting coefficient, but also has high light transmissivity and low refractive index, therefore, it is not only fits for the request of high head insulation, but also fits for the transparency request, and can be used as high heat insulation transparent layer of the landing glass of high-rise building and car glass; the row material for preparing aerogel heat insulation film is low in cost, and benefits for realizing commercial application.

The present invention relates to a new process for producing methane chloride by using liquid-phase catalytic method and pressurization process. The hydrogen chloride and methyl alcohol are mixed according to a certain ratio, then placed in a tank reactor with catalyst, and under the condition of a certain temp. and pressure the invented methane chloride can be synthesized. It adopts acid/water washing and alkali-washing processes to remove unreacted methyl alcohol and hydrogen chloride, and adopts concentrated sulfuric acid washing process to remove residual water content and reaction by-product dimethyl ether, then the purified and dried methane chloride gas is undergone the processes of compression and condensation so as to obtain high-purity liquid methane chloride product.

The invention discloses a zinc catalyst applicable to controllable depolymerization of a polyester material and a catalytic method thereof, and belongs to the technical field of polyester depolymerization. The problems that an existing zinc catalyst used for alcoholysis of waste polyester materials needs to synthesize complex ligands, and the number of synthesis steps is increased are solved. Thecatalyst adopted by the invention is a bis(hexaalkyldisilazane)zinc catalyst with a simple structure, and under the participation of an alcohol compound, the polyester material can be depolymerized into small organic molecules under mild conditions through the transesterification reaction catalyzed by the catalyst, so that the reutilization of waste polyester is realized. The zinc catalyst is adopted to catalyze polyester depolymerization, metal zinc is non-toxic, colorless, cheap and easy to obtain and serves as one of the microelements of a human body, biocompatibility is good, and the production process is more environmentally friendly; the catalyst is simple in structure, few in synthesis steps and more economical in production cost. The catalyst has very good universality, and has a very good depolymerization effect on various polyester materials with different structures.

The invention discloses a microwave-induced catalytic preparation method of nano-sized tungsten carbide. Preparation steps of the invention are that: (1) a certain mass of tungstenic material is dissolved in a microwave resistant absorption vessel which contains solvent, and dispersant and carbon source are added into the vessel in sequence; the mixture is put into an ultrasonic clearing machineto disperse homogeneously with ultrasonic, and then the mixture is taken out to be stirred till the mixture becomes viscous slurry; (2) the viscous slurry is put into a microwave oven, and drying powder can be obtained by a intermittent microwave heating method, namely, the slurry is heated intermittently; (3) a certain proportion of metallic powder is added into the drying powder, and the obtained mixture is put into a crucible after mixing homogeneous mechanically; after surroundings of the crucible are coated with microwave resistant heat preserving materials, the crucible is put into the microwave oven to be heated constantly, and nano tungsten carbide particles are obtained. The invention adopts the microwave-induced catalytic method, thus the tungsten carbide can be heated to high temperature quickly; the invention is characterized by fast preparation speed and low energy consumption, and purity quotient of the prepared nano tungsten carbide particles is high.

The invention relates to a photoelectric catalytic unit and a photoelectric catalytic method. The photoelectric catalytic unit comprises a photocatalytic film deposited on a conducting substrate, and a thermoelectric device electrically connected with the photocatalytic film, wherein the surface of the thermoelectric device is provided with a photothermal material. The photoelectric catalytic method comprises the following steps: photogenerated electrons and holes generated on the photocatalytic film deposited on the conducting substrate under the light excitation are utilized to degrade organic pollutants in contact with the photocatalytic film; and the thermoelectric device is utilized to convert heat energy, which is generated by the photothermal material on the surface under the irradiation of visible light or infrared light, into electric energy, and apply the electric energy onto the photocatalytic film electrically connected with the photocatalytic film to promote the separation of the photogenerated electrons and the holes.

The invention provides a preparation method of a reinforced magnesium matrix composite and relates to an alloy which contains non-metal fibers or filaments and is manufactured through contact of fibers or filaments with molten metal. According to the preparation method, carbon nanotubes grow on nano silicon carbide particles in situ with a floating catalytic method, then carbon nanotube-silicon carbide in-situ composite reinforcement phases are prepared, and the carbon nano tube-silicon carbide hybrid reinforced magnesium matrix composite is prepared with a spark plasma sintering process on the basis of mechanical stirring and mixing of a liquid phase. The defects that an existing preparation method of a reinforced magnesium matrix composite has a poor carbon nanotube synthesis effect, structural damage is easily caused, the reinforcement effect is poor, reinforcement phases are non-uniformly distributed in a magnesium matrix, the reinforcement phases and the magnesium matrix have a poor interface reaction easily, carbon nanotube-aluminum oxide composite reinforcement phases have poor structural design and are not suitable for serving as reinforcement phases of the magnesium matrix composite, and the mechanical performance of the prepared magnesium matrix composite is non-ideal are overcome.

The invention discloses a method for hard carbon negative electrode materials of a lithium ion battery and belongs to the technical field of hard carbon negative electrode materials of the lithium ion battery. By means of the method, one or several kinds with any proportion of sulfuric acid, sulfate, boric acid, borate, phosphoric acid, phosphate, muriatic acid, muriate and ammonia or ammonium salt is/are chosen as a catalyst/catalysts for preparing the hard carbon negative electrode materials of the lithium ion battery in a catalysis method, and compared with the catalysts used in the prior art, the catalysts used in the preparing process of the materials are reduced in low-temperature section stabilized heat treatment temperature, the time is shortened by nearly 10 times, a large number of resources are saved, production cost is reduced, and capacity is improved.

The invention discloses a preparation method of a silica aerogel and glass fiber mat composite material. The preparation method comprises the following steps: glass fiber mat is placed in rolls or in a tiled form into an appropriate container; a novel ''two-step catalytic method'' of acid-catalytic hydrolysis and fluorinion catalytic condensation is adopted during sol-gel process of silica aerogel; the prepared sol-gel precursor solution is injected into the well-laid glass fiber mat, air in the glass fiber mat is exhausted, and gaps in the glass fiber mat are filled with the sol-gel precursor solution; the sol-gel precursor solution is gelated in the gaps of the glass fiber mat so as to obtain a glass fiber met-gel composite material, and the gelated glass fiber mat composite material is rolled-up again; and the rolled-up glass fiber mat and silica aerogel composite material is modified in an ethanol solution of hexamethyl-disilazane, and the gel composite material undergoes supercritical fluid drying to obtain the silica aerogel and glass fiber mat composite material.

The invention relates to a heterogeneous catalytic method for synthesis of isophorone from acetone. Acetone is used as a raw material, and a magnesium-aluminum composite oxide is used as a catalyst for carrying out catalytic synthesis to obtain isophorone; the magnesium-aluminum composite oxide comprises MgO, Al2O3 and MgAl2O4, the molar ratio of magnesium to aluminum is 0.3-3, the specific surface area is 80-150m<2>/g, and the pore volume is 0.2-0.3cm<3>/g; a fixed bed reactor is used for carrying out synthetic reaction, 20ml of 20 to 40-mesh catalyst is added into a stainless steel reactor of which the inner diameter is 10mm, the reactor is heated to the reaction temperature from the room temperature at the rate of 10 DED C/min after being qualified through an air-tight test, and then, the analytically pure acetone raw material is injected into the reactor by a duplex plunger pump through a preheater; the reaction temperature is 220-290 DEG C; the reaction pressure is normal pressure; and the air speed of the acetone liquid is 0.1-1.0/h, the selectivity reaches 94.5%, the conversion rate reaches 44.8%, and the stability reaches 1000 hours.

The invention relates to a fluidized catalytic method for toluene methylation, and mainly solves the problems of great temperature rise of a catalyst bed, many side reactions and low methanol utilization rate in existing technologies. The method comprises the steps of: a) first putting an alkylating reagent methanol into a fixed bed reactor so as to contact with a dehydration catalyst for reaction, thus generating mixed effluent I containing dimethyl ether, water and unreacted methanol; b) mixing a toluene raw material with the reaction effluent I and conducting vaporization so as to obtain a reaction mixture II, which is then subjected to contact with a methylation for reaction catalyst in a fluidized bed reactor, thus obtaining oil-phase reaction effluent III rich in xylene, gas-phase reaction effluent IV and water-phase effluent V; c) separating the oil-phase reaction effluent III, thus obtaining an unconverted toluene fraction containing bits of benzene, a mixed C8 fraction as well as C9 and C9+ heavy aromatic fractions; d) subjecting the mixed C8 fraction to adsorption, crystallization or a adsorption/crystallization combination separation and isomerization system, thus obtaining a paraxylene product, refluxing the unconverted toluene fraction containing bits of benzene, and mixing it with the reaction mixture II in the fluidized bed reactor for conversion. The technical method of the invention well solves the above problems, and can be applied to industrial production of paraxylene preparation through a methylation reaction with toluene as the raw material.