70results about "Catalyst activation/preparation" patented technology

The invention relates to a method for preparing a catalyst with active metal component nonuniform distribution, which comprises the step of introducing effective quantity of at least one metal component selected from a VIII group and effective quantity of at least one metal component selected from a VIB group on a carrier by a soaking method. The method is characterized in that the soaking process comprises the following steps: firstly, mixing one or more acid selected from nitric acid, phosphoric acid, oxalic acid, citric acid, tartaric acid, pimelic acid and adipic acid, a compound of at least one metal component containing the VIB group, a compound of at least one metal component containing the VIII group, and water in sequence into a solution; secondly, using the mixed solution prepared in the first step to soak the carrier at room temperature, wherein the soaking time is between 1 and 5 hours; and thirdly, drying the carrier soaked in the second step for 2 to 10 hours at a temperature of between 60 and 160 DEG C, and roasting the soaked carrier for 2 to 5 hours at a temperature of between 400 and 600 DEG C. The method adopts the one-step soaking method to greatly simplify the preparation method of the catalyst.

A cracking catalyst contains a substantially inert core and an active shell, the active shell containing a zeolite catalyst and a matrix. Methods of making and using the cracking catalyst are also described.

A composite oxide includes CeO₂, ZrO₂ and a metallic oxide being free from reacting with CeO₂ and ZrO₂ at 700° C. or more, preferably at 900° C. or more and further preferably at 1,000° C. or more. The composite oxide has a regulatory oriented phase, such as a pyrochlore phase, etc., in which at least a part of Ce cations and Zr cations are oriented regularly. The composite oxide makes a catalytic support. The CeO₂—ZrO₂ composite oxide and the reaction-free metallic oxide make barriers each other which suppress the granular growth when the composite oxide is subjected to high-temperature heat in a reducing heat treatment to form the regulatory oriented phase. The regulatory oriented phase improves the oxygen storage-and-release capability of the catalytic support. Thus, it is possible to simultaneously attain a large a specific surface area and a high oxygen storage-and-release capability.

A novel carbon nanotube powder containing carbon nanotubes which have a roll-like structure, also novel carbon nanotubes having a roll-like structure, novel processes for the production of the carbon nanotube powders and of the carbon nanotubes, and their use as an additive or substrate for various applications are described.

The invention discloses a copper and iron compound honeycomb coating type denitrification catalyst as well as a preparation method and application thereof. The catalyst provided by the invention takesa copper-based molecular sieve prepared through an ion exchange method or an immersion method as an active component, ferric polysilicate is added as a co-catalysis component, a honeycomb cordieriteceramic block is used as a carrier and an aluminum sol is used as as a binder. The catalyst prepared by the invention is prepared through a vacuum coating method; the preparation method is simple to operate, holes are not liable to block in a coating process and large-scale production is easy to realize; a coating has a large capacity and the coating fastness of active components is high; a good cooperative catalysis effect is formed between duplex metal including copper and iron, the denitrification activity of the catalyst is improved and the anti-H2O performance and anti-SO2 performance ofthe catalyst are also improved. The catalyst provided by the invention has a denitrification efficiency of 90 percent or more in a range of 220 to 510 DEG C and has a good application prospect in a stationary source denitrification direction.

The invention relates to a method for preparing solid base catalyst with high specific surface by hybrid composite precursors, belonging to the technical field of preparation of composite metal oxide. The method comprises the following steps of: according to the characteristics of designability in structure and adjustability in laminate composition of laminated composite metal hydroxide, introducing a certain amount of Mg and Al, or Ca, Cu, Co, In and Ga on the laminate, preparing laminated compound, obtaining hybrid composite precursors by hybridization with carbon, then conducting high-temperature roasting on the precursors and obtaining the solid base catalyst of composite metal oxide with high specific surface and mesoporous structure. Due to introduction of the carbon into the precursors, the composite metal oxide obtained by the method has the characteristics of narrow pore size distribution and large specific surface area and the like, and the application of the catalyst in Knoevenagel condensation reaction of benzaldehyde and ethyl cyanoacetate shows good base catalytic activity.

According to the invention, the porous carbon-coated nano zero-valent iron composite catalyst is prepared by taking a metal skeleton as a precursor, and has excellent catalytic performance in an electro-Fenton process. The synthesis method has the advantages of simplicity and convenience in operation, low equipment requirement, good product performance reproducibility and the like. Due to the synergistic effect of iron and carbon, electron transfer is accelerated, and the catalytic efficiency is remarkably improved. The iron-carbon material has strong magnetism, can be quickly separated in a magnetic field, and is convenient to recover.

The composition of nano-grade lanthanum titanium compound oxide is La2-4Ti2-9O7-24, in which La:Ti:O (atom ratio)=2-4:2-9:7-24, LawTi2O7 and La4Ti9O24 are existed in micro-crystal state, its average grain size is 28nm-35nm, and its specific surface area is greater than 60 sq.m/g. Said compound oxide can be used as catalyst for preparing lactide by utilizing lactic acid dehydration and polycondensation, can improve viscosity of reaction system and can effectively reduce lactic acid oligomer cracking temp., and the yield of lactide is 80%-90%.

The present invention relates to a novel nickel catalyst. The present invention also relates to a process for the preparation of an improved nickel catalyst. The present invention also relates to a process for hydrogenation of m-dinitro benzene to m-phenylene diamine using the said improved catalyst. More particularly the present invention relates to a process involving hydrogenation of m-dinitrobenzene to m phenylene diamine in the presence of a supported bimetallic platinum catalyst, using methanol as a solvent. The catalyst system consisting of one metal selected from platinum group and other nickel supported on either carbon or alumina or silica or zeolite. The catalyst of the present invention is a bimetallic catalyst prepared by precipitation and impregnation technique at very specific preparation conditions.

The invention discloses a trivalent copper catalyst and a preparation method thereof and application to hydrochlorination of acetylene. The preparation method of the trivalent copper catalyst comprises the steps that a nitrogen-containing heterocyclic compound and copper salt are added into a trichloromethane solution to mix to obtain a mixed solution A containing a bivalent copper compound; ionicliquid is added into the obtained mixed solution A, and under the action of an oxidant, a mixed solution B containing a trivalent copper compound is obtained; and a porous solid carrier is immersed in the obtained mixed solution B containing the trivalent copper compound for 0.5-5 h, then the treated solid is taken out, and heated and dried under the condition of blue light irradiation, and the trivalent copper catalyst is obtained. The trivalent copper catalyst is used for the reaction of acetylene hydrochlorination to prepare vinyl chloride. The trivalent copper catalyst is prepared by simple operation steps, the stability and activity of the catalyst are improved, the production cost is lowered, and good application prospect is achieved.

The present invention provides a photocatalyst film that includes a support; an organic-inorganic composite layer containing, in a graft polymer layer including a graft polymer chain directly bonded to the surface of the support, a crosslinked structure formed by hydrolysis and condensation polymerization of an alkoxide of an element selected from Si, Ti, Zr or Al; and a photocatalytically active layer, in this order, and a method for producing the same.

The present invention belongs to the field of nano carbon material and its processing and application. The preparation process of carbon nanotube carrying CeO2 includes adding carbon nanotube into the mixed solution of alcohol and water via ultrasonic stirring; adding CeCl3 solution of 0.01-0.1 g/ml concentration into the mixed solution; dropping alkali solution of 0.002-0.02 g/ml concentration into the mixed solution until the mixed solution become alkali; stirring, filtering and stoving to obtain solid powder; and heating the solid powder in air and at 100-400 deg.c to obtain stable and well dispersive CeO2 carrying carbon nanotube particle with CeO2 covering rate over 80 % and average size of 5 nm. The CeO2 carrying carbon nanotube particle may be used as catalyst and other functional material widely.

The invention discloses an activated carbon-supported ruthenium-based ammonia synthetic catalyst and a preparation method thereof. The preparation method comprises the steps of with potassium ruthenate K2RuO4 H2O as a metallic ruthenium precursor, liquid ammonia and acetic acid as a stabilizer of ruthenium impregnation liquid, alkaline metal and alkaline-earth salts or bases as aids, and activatedcarbon as a supporter, performing impregnating to obtain the activated carbon-supported ruthenium-based ammonia synthetic catalyst. The activated carbon-supported ruthenium-based ammonia synthetic catalyst prepared herein is free of chlorine ions; active ingredients and the aids are distributed evenly on the catalyst; the prepared catalyst has stable performance, high activity, and good safety ofuse and is suitable for industrial production and application.

A process for preparing an amine by reacting a primary or secondary alcohol, aldehyde and/or ketone with hydrogen and a nitrogen compound selected from the group of ammonia and primary and secondary amines, in the presence of a supported copper-, nickel- and cobalt-containing catalyst, wherein the catalytically active material of the catalyst, before the reduction thereof with hydrogen, comprises oxygen compounds of aluminum, of copper, of nickel, of cobalt and of tin, and in the range from 0.2 to 5.0% by weight of oxygen compounds of yttrium, of lanthanum, of cerium and/or of hafnium, each calculated as Y₂O₃, La₂O₃, Ce₂O₃ and Hf₂O₃ respectively, and catalysts as defined above.

The invention relates to a prussian blue analogue nanosheet array material and a water electrolysis application thereof, wherein a preparation method of the material comprises the following steps: 1)pretreating foamed nickel to serve as a matrix; 2) mixing a Co(NO3)2.6H2O solution with a Na2Fe(CN)5NO.H2O solution, and then stirring at room temperature until the solution is turbid to obtain a mixed solution; and 3) putting the matrix into the mixed solution, carrying out standing reaction for 2-48 h, and carrying out post-treatment to obtain the prussian blue analogue nanosheet array material.The material is used as a catalyst for water electrolysis reaction. Compared with the prior art, the prepared ultrathin prussian blue analogue nanosheet array material is simple in preparation process and low in cost, can be used for carrying out stable and efficient hydrogen evolution reaction, oxygen evolution reaction and total water decomposition under different current densities, and has huge potential value in large-scale hydrogen production application.

A carbon catalyst which has high catalytic activity and can achieve high catalyst performance is provided. The carbon catalyst comprises nitrogen. The energy peak area ratio of the first nitrogen atom whose electron in the 1s orbital has a binding energy of 398.5±1.0 eV to the second nitrogen atom whose electron in the 1s orbital has a binding energy of 401±1.0 eV (i.e., the value of (the first nitrogen atom)/(the second nitrogen atom)) of the nitrogen introduced into the catalyst is 1.2 or less.

A naphtha reforming catalyst, comprising an alumina support and following components with the content calculated on the basis of the support: VIII group metal 0.1-2.0% by weight, VIM group metal 0.1-3.0% by weight, sulfate ion 0.45-3.0% by weight, and halogen 0.5-3.0% by weight. The catalyst is used in a naphtha reforming reaction without presulfurization and has a high aromatization activity and a selectivity.

An apparatus for the photocatalyitc oxidation of common industrial effluent contaminants in aqueous solution includes a reactor and a thin film photocatalyst fixed to a support material like Cuddapah stone. The support material is preferably an inert material. The TiO2 preformed does not contain any adsorbent for making the thin film photocatalyst, The catalytic runs were carried out over TiO2 thin film fixed bed reactor. The study is extended to the immobilization of preformed TiO2 with a binder for making thin film using a simple spray technique on inert Cuddapah stone. This method of immobilization require no thermal treatment of the catalyst at high temperatures. The method is applicable for the photocatalytic treatment of industrial effluents at a higher scale. Also it is a method for preparing a photocatalyst adopted for the oxidation of industrial common effluent by simple spray technique. Also it is a method and apparatus for destroying industrial common effluent contaminants in aqueous solution

The invention relates to a Pd-Re catalyst for propylene glycol preparation by glycerol hydrogenolysis and a preparation method thereof and belongs to the technical field of comprehensive utilization of resources and fine chemical engineering. The invention is characterized in that Pd is used as a main catalyst component, Re is used as a co-catalyst component and an inorganic oxide or carbon nanotube is used as a carrier; a supported Pd-Re catalyst precursor is prepared by an immersion method; and without roasting, hydrogen is directly used for reduction, so as to obtain the supported Pd-Re catalyst. The supported Pd-Re catalyst prepared by the method is used in a glycerol hydrogenolysis reaction so as to directly convert glycerol to propylene glycol, and has high activity and sensitivity.

The invention discloses a preparation method of a fluorination catalyst. The preparation method is as follows: preparing a solution of active component metal salts, wherein preferably the atomic ratio of Co/Cr is 0.05-0.25 and the atomic ratio of Y/Cr is preferably 0.01-0.15; reacting with ammonia water as a precipitant at a PH value between 7 and 9; further stirring and aging for 9-11 minutes; filtering, and washing with deionized water till the solution is neutral; drying a filter cake at a temperature of 100-150 DEG C; carrying out calcination in an inertial gas environment to obtain a catalyst precursor; crushing the catalyst precursor and mixing the catalyst with graphite; laminating the uniformly mixed powder till the lamina cannot be crushed with hands; at the temperature of 200-400 DEG C, introducing inertial gas and hydrogen fluoride mixed gas, and carrying out fluorination to obtain the catalyst, wherein metal cobalt and yttrium form corresponding metal oxide during calcination stage; small metal oxide particles move in the catalyst precursor and the catalyst precursor is etched by the particles, the etching of the residual moisture in the catalyst precursor to the catalyst precursor can also be catalyzed, so as to form a series of porous structures in which medium pores take a great proportion.

Systems and methods for synthesizing long carbon nanotubes and using the nanotube as an electrical conductor. A substrate is provided with one or more metal underlayer platforms that allow the nanotube to grow freely suspended from the substrate. A modified gas-flow injector is used to reduce the gas flow turbulence during nanotube growth. Nanotube electrodes are formed by growing arrays of aligned nanotubes between two metal underlayer platforms.

The invention discloses a preparation method of ferric vanadate photocatalysts. According to the method, firstly, a direct current electrolysis method is used; by controlling the current density, the electrolyte concentration and the temperature, ferric vanadate with different appearance structures and particle diameters is prepared; then, products obtained at an anode are cleaned and filtered; obtained filter cake is dried for 4 to 6h at the temperature of 80 DEG C to 100 DEG C; natural cooling is performed to room temperature; finally, at the air atmosphere, the temperature is raised to 500 to 700 DEG C at the temperature rise speed of 2.5 to 10 DEG C/min; high-temperature roasting is performed for 3 to 5 h; the ferric vanadate with high purity and high cleanness degree can be obtained; the composition is FeVO4. The product obtained by controlling the corresponding conditions has the main appearance of ball-shaped particles and micro nanometer lines.

The invention belongs to the field of catalysts, and discloses a preparation method of an oxygen reduction catalyst using waste battery negative electrode graphite. The method comprises the followingsteps of: (1) recovering graphite slag from a waste battery, and carrying out heat treatment on the graphite slag; (2) ball-milling and mixing the treated graphite slag, a ferric salt and an nitrogen-containing organic matter to obtain a catalyst precursor; (3) carbonizing the catalyst precursor in an inert gas atmosphere to obtain a carbon-based mixture containing iron and nitrogen; and (4) dissolving the carbon-based mixture containing iron and nitrogen in an acid solution, performing filtering and drying, and performing carbonizing treatment again in an inert gas atmosphere to obtain the oxygen reduction catalyst utilizing the waste battery negative electrode graphite. According to the method, the graphite slag generated in the waste lithium ion battery recycling process is adopted as the raw material, the source is wide, the cost is low, environmental pollution can be reduced, and good economic benefits are achieved.

The invention discloses a graphene hybridized photocatalyst hydrogel, belonging to the field of nanometer materials. The graphene hybridized photocatalyst hydrogel is used for treatment of water pollution and prepared by using graphite oxide and a photocatalyst as raw materials through a reduction reaction and ultrasonic treatment. The graphene hybridized photocatalyst hydrogel provided by the invention can promote the dispersion of graphene oxide in water, avoids further aggregation of a nanoscale photocatalyst from generation in the process of hydrogel formation, can significantly improve the specific surface area and adsorption capacity, has more obvious three-dimensional cross-linked mesoporous microstructure, can realize the synergistic effect of adsorption enrichment and photocatalytic degradation, significantly reinforces the in-situ catalytic degradation ability of adsorbed and enriched pollutants, and can greatly improve the mineralization and removal efficiency of pollutants.