20573results about "Catalyst activation/preparation" patented technology

The invention discloses a cyanamide axial coordination cobalt monatomic catalyst for persulfate activation and a preparation method and application thereof, and belongs to the technical field of persulfate advanced oxidation. The catalyst is prepared by the following method: simultaneously adding NH2CN and NaOH into a CoCl2 solution, stirring for reaction, and after the reaction is finished, washing, filtering and drying to obtain the catalyst CoN4 (NCN). The catalyst CoN4 (NCN) with an isolated Co site and cyanamide ([NCN] 2-) coordination structure is synthesized by adopting a one-step precipitation method. The catalyst can be used for an advanced oxidation system based on persulfate activation, and can be used for deeply treating a water body polluted by high-concentration organic matters, so that the biodegradability of the water body is improved. In addition, CoN4 (NCN) also has obvious stability and environmental adaptability, and has important application prospect and value in the field of organic pollutant degradation.

The invention provides a novel acrylonitrile catalyst and a preparation method thereof. The novel acrylonitrile catalyst is prepared from the following raw materials: mixed salt, an active component, silica sol, a rare earth precursor, a carrier and a cosolvent, by introducing the cosolvent and optimizing the carrier structure, the dispersity of the rare earth precursor is improved, the production process is optimized, the doping efficiency of the rare earth precursor is remarkably improved, the activity, selectivity and stability of the novel acrylonitrile catalyst are improved, generation of by-products CO, CO2, acrolein and acrylic acid during acrylonitrile production can be reduced, and industrial efficient preparation is achieved.

The invention belongs to the technical field of CO catalytic oxidation, and particularly discloses a method for synthesizing a CuO / CeO2 catalyst through a rapid fluid mixing method and application thereof.The method comprises the steps that a copper salt solution A and a cerium salt solution B are put into a rapid fluid turbulence mixing reactor, the flow speed is controlled, a catalyst precursor is prepared after product treatment, the catalyst precursor is put into a muffle furnace, air is introduced for calcination, and the catalyst is prepared; and high selectivity and high conversion rate in CO oxidation reaction in a hydrogen-rich environment are realized. The method provided by the invention also improves the traditional MOF synthesis method, adopts water as a solvent, and reduces the synthesis conditions. The prepared catalyst has high conversion rate and selectivity, the CO conversion rate at 90 DEG C reaches 100%, and the corresponding selectivity is 100%.

The invention relates to the technical field of catalyst carriers, and relates to a modified alpha-alumina carrier, a preparation method thereof, a supported silver catalyst and application. The modified alpha-alumina carrier is an alpha-alumina carrier with a silane coupling structure on the surface, and silane is at least one of silane compounds containing 1-3-Si-O-C-structures and containing vinyl or amino. Preferably, the silane compound is selected from at least one of vinylmethoxysilane, 3-aminopropyltriethoxysilane and methylvinyldimethoxysilane. According to the modified alpha-alumina carrier, the silane solution is adopted to treat the alpha-alumina carrier, silane contains a-Si-O-C-structure, the group can form a relatively stable structure on the surface of the carrier after hydrolysis or dehydration condensation, and influence is generated for a long time in the use process of a silver catalyst, so that the performance of the catalyst is improved.

The invention discloses a copper-based nano-enzyme, a preparation method thereof and application of the copper-based nano-enzyme in organophosphorus pesticide detection, and belongs to the technical field of pesticide residue detection. The copper-based nano-enzyme has a netted-like structure, a high specific surface area and many active sites, the valence state of a copper element is zero-valence Cu, Cu < + > and Cu < 2 + >, the copper-based nano-enzyme has high peroxidase-like activity and laccase-like activity, the detection limit is low, and glyphosate can be sensitively detected; and glyphosate, glufosinate-ammonium and isazofos can be well distinguished from six organophosphorus pesticides with medium concentration, and the method has high selectivity. The nano enzyme provided by the invention is prepared from ammonium citrate and copper nitrate in an N, N-dimethylformamide (DMF) solution by using a solvothermal method; the preparation process of the nano enzyme is simple.

The invention discloses a method for detecting glufosinate-ammonium residues in coffee in dual modes of colorimetry and chemiluminescence, and belongs to the technical field of chemical analysis and detection.The method comprises the steps that Schiff base formed by 4-aminoantipyrine and glutaraldehyde serves as a complexing agent of Cu < 2 + >, and then a copper-doped carbon dot Cu-CDs nano-enzyme is prepared through microwave digestion; according to the present invention, the Cu-CDs nano-enzyme has excellent peroxidase-like activity, can oxidize the colorless 2, 2 '-biazo-bis-3-ethylbenzothiazoline-6-sulfonic acid into the blue-green oxidized ABTS, and can improve the chemiluminescence intensity of the reaction of N-(4-aminobutyl)-N-ethylisoluminol and H2O2 by nearly 100 times when the Cu-CDs nano-enzyme is used as the chemiluminescence catalyst; based on the inhibition effect of glufosinate-ammonium on the activity of Cu-CDs POD, a sensitive and rapid colorimetric and chemiluminescence two-channel GM detection technology is developed, and the method has potential application value in the aspect of coffee safety monitoring.

The present disclosure is directed to a processing solution composition comprising a metal salt, an acid, a solvent, and a non-metal reductant. The present disclosure is also directed to a method of impregnating a porous material by covering or coating the porous material with a processing solution comprising a metal salt, an acid, a solvent, and a non-metal reductant.

The invention discloses a multifunctional composite material for mineralizing and storing CO2 based on fly ash and a preparation method of the multifunctional composite material. The material is prepared from high-activity fly ash subjected to plasma activation treatment, a nanoscale metal oxide catalyst, a metal organic framework, a functional organic ligand, an intelligent pH regulator, a solid suspension stabilizer and water. The preparation method comprises the steps of suspension preparation, high-pressure CO2 mineralization reaction in a reaction kettle, centrifugal separation and freeze drying treatment. The method is simple, the raw material cost is low, the prepared multifunctional composite material not only can remarkably improve the storage efficiency of CO2, but also can ensure that a stable carbonate product is generated, and the carbonate product has high specific surface area and excellent chemical stability, can be widely applied to the fields of high-end building materials, energy storage materials and fine chemical engineering, and has wide application prospects. And meanwhile, the high-added-value utilization of the industrial by-product fly ash is realized, and the dual purposes of reducing carbon emission and improving the utilization rate of solid wastes are achieved.

According to the Pt cluster catalyst, the preparation method and the application, an aluminum oxide composite metal oxide carrier is prepared by adopting a pH swing method, a defect oxide nano island is formed through high-temperature reduction treatment, and oxygen vacancies contained on the surface can firmly anchor a subsequently loaded Pt cluster, so that the coking phenomenon of the Pt-based catalyst is reduced, and the catalytic activity of the Pt-based catalyst is improved. The catalytic activity and the stability of the Pt cluster catalyst are obviously improved. Meanwhile, Pt clusters are prepared through a heating reflux method, so that the Pt clusters have high dispersity and rich active sites, the finally prepared Pt cluster catalyst is small in Pt particle size and high in atom utilization rate, and when the Pt cluster catalyst is used for catalyzing a dehydrogenation reaction of a liquid organic hydrogen carrier, the Pt cluster catalyst is weak in adsorption capacity to a product, and the catalytic activity of the liquid organic hydrogen carrier is improved. The catalyst can show high conversion rate and hydrogen release rate at low temperature, can still keep stable structure at high temperature, and provides an efficient and reliable solution for engineering application of an LOHC dehydrogenation link.

The invention belongs to the field of photocatalytic materials, and particularly relates to a high-entropy sulfide and a preparation method and application thereof. The high-entropy sulfide is granular, the molecular general formula is (MnaFebCocCudZe) xS, x is equal to 1, and the atomic ratio of Mn to Fe to Co to Cu to Zn is a: b: c: d: e of (1-2): (1-2): (1-2): (1-2): (1-2): (1-2): (1-2). The preparation method comprises the following steps: S1, dissolving metal salt in a mixed solvent of isopropanol and glycerol according to the atomic ratio of metal elements, and carrying out solvothermal reaction to obtain a precursor; and S2, dispersing the precursor in ethanol, adding thioacetamide as a sulfur source, and carrying out solvothermal reaction to obtain the high-entropy sulfide. The high-entropy sulfide disclosed by the invention is used as a photocatalytic material and shows excellent photocatalytic performance.

The invention discloses a high-entropy oxide for synergic nitrogen removal and catalysis as well as a preparation method and application thereof, and belongs to the technical field of material preparation, the high-entropy oxide is a single solid solution phase formed by five or more metal elements of Fe, Co, Ni, Cu, Mn, Ti and Ce and an oxygen element, the configuration entropy of the high-entropy oxide is greater than or equal to 1.5 R, R is a gas constant, and R is an oxygen constant. The mole fraction of each metal element is 0.1-0.3, and the sum of the mole fractions of the metal elements is 1. According to the high-entropy oxide with the synergistic nitrogen removal and catalysis effects and the preparation method and application thereof, a synergistic catalysis system is constructed through the high-entropy oxide and silicon carbide, and the high-entropy oxide has the multiple advantages of being high in nitrogen removal efficiency, high in stability, simple in process, environmentally friendly and wide in application range; the removal rate of total nitrogen and key nitrogen pollutants can reach 90% or above in the seawater high-salt environment, and the environment-friendly emission requirement is met.

The invention relates to the technical field of catalyst preparation, and discloses a vanadium-based catalyst and a preparation method and application thereof. The vanadium-based catalyst comprises modified diatomite, an active component and an auxiliary active component, wherein the active component and the auxiliary active component are loaded on the modified diatomite; wherein the content of crystalline SiO2 in the modified diatomite is not less than 90%, the active component comprises vanadium pentoxide, and the auxiliary active component comprises potassium sulfate. The vanadium-based catalyst is an anti-resistance vanadium-based catalyst, the filling amount of the catalyst is small, and the filling amount of the catalyst can be reduced by 35% on the premise that the same performance is achieved, so that the pressure drop of a sulfuric acid device is greatly reduced, the total conversion rate of SO2 is guaranteed, and the method is particularly suitable for a production device for preparing sulfuric acid through waste acid cracking with high raw material gas impurity content; and the method has great advantages on long-period operation.

A composition of matter is provided comprising hierarchically ordered crystalline microporous material having well-defined long-range mesoporous ordering of lamellar symmetry. The composition possesses mesopores having walls of crystalline microporous material and a mass of mesostructure between mesopores of crystalline microporous material. Long-range ordering is defined by presence of secondary peaks in an X-ray diffraction (XRD) pattern and / or lamellar symmetry observable by microscopy.

A reactor system includes a reactor that treats a lipid feedstock using a metal oxide catalyst to produce a treated stream comprising a bio-oil. The metal oxide catalyst includes catalyst particles having a diameter of 0.01 to 0.5 mm. The metal oxide catalyst can comprise calcium on alumina. The bio-oil has an increased proportion of transportation fuels relative to other techniques for processing lipid feedstocks.

The invention belongs to the technical field of catalysts, and particularly relates to an alumina-based catalyst for anthraquinone hydrogenation and a preparation method thereof.The preparation method comprises the following steps that 1, aluminum salt and PVP are added into deionized water, and an aluminum salt mixed solution is obtained; (2) adding ammonium salt and cyclic polysaccharide micromolecules into deionized water to obtain an ammonium salt mixed solution; (3) dropwise adding the aluminum salt mixed solution into the ammonium salt mixed solution while stirring, and performing aging, suction filtration, drying and calcination to obtain an alumina carrier; (4) impregnating the alumina carrier with a palladium salt solution; and (5) drying, roasting and reducing the impregnated alumina carrier to obtain the alumina-based catalyst for anthraquinone hydrogenation. Macromolecular PVP (Polyvinyl Pyrrolidone) and cyclic polysaccharide micromolecules are used as composite template agents for ammonium-aluminum coprecipitation, so that not only is an alumina carrier material with a high specific surface area prepared, but also the loading capacity on palladium is improved, the dispersion of palladium is promoted, and the hydrogenation efficiency is favorably improved.

Disclosed are high-entropy oxides, and methods of their preparation. The high-entropy oxide is characterised by a sub-micron particle size and rod-like particle shape. The method of its preparation includes a co-precipitation step, preferably using an oxalate compound as a precipitating agent. Also disclosed are an electrode, e.g. an anode, a catalyst and an electrochemical cell comprising the high-entropy oxide.

The invention discloses a preparation method of an In2O3-Cu-Cu2O ternary heterojunction catalyst and a preparation method of the In2O3-Cu-Cu2O ternary heterojunction catalyst. The method comprises the following steps: at room temperature and normal pressure, firstly, dissolving indium chloride tetrahydrate in a mixed solvent of ethylenediamine-ethylene glycol (the volume ratio is 1: 20-1: 30) and dihydric alcohol amine to obtain a homogeneous solution; then transferring the solution to a hydrothermal kettle, adding deionized water and Cu2O powder with different volumes, and carrying out hydrothermal crystallization at 160-200 DEG C for 10-14 hours; and centrifuging the obtained precipitate, alternately washing with water and alcohol for 2-3 times, carrying out vacuum drying at 60 DEG C for 5-7 hours, heating to 600 + / -10 DEG C at a speed of 3-5 DEG C / min in an N2 atmosphere, calcining for 3 hours, and cooling along with a furnace to obtain a target product. By adjusting the adding amount of the deionized water, the mass proportion of the three phases of In2O3, Cu and Cu2O can be continuously adjusted and controlled, and controllable preparation from'rich copper 'to'rich cuprous oxide' and'stable ternary 'is achieved.

Disclosed herein is a catalytic comprising a hexacyano metal compound; wherein the hexacyano metal compound comprises a metal selected from the group consisting of cobalt, iron, copper, manganese, nickel, zinc, and combinations thereof; wherein the hexacyano metal compound comprises coordinatively unsaturated metal (II)—N—C centers for; and wherein the hexacyano metal compound is anchored onto an inorganic substrate. Also disclosed are a system including the catalytic material and a process for treating wastewater using the catalytic material.

The invention discloses a method for catalytically oxidizing lignin to depolymerize into an aviation oil intermediate by using a cellulose carbon aerogel supported copper nano-catalyst. Comprising the following steps: (1) dissolving cellulose powder into a mixed alkali solution of NaOH and urea, and stirring at low temperature to obtain a clear and transparent cellulose solution; and washing to be neutral to obtain well dispersed cellulose suspension. And (2) carrying out suction filtration molding, and freeze-drying for a period of time to obtain the cellulose aerogel. And (3) immersing in an ethanol solution of copper nitrate for ultrasonic treatment, and drying in a vacuum drying oven. And (4) carrying out high-temperature calcination in an N2 atmosphere to obtain a catalyst which is marked as Cu / CA. And (5) the catalyst can efficiently catalyze a Fenton-like reaction to oxidize a dimer model compound of lignin in acidic, neutral and alkaline environments to obtain products including benzoic acid, acetophenone, benzyl alcohol, phenol and the like, the required hydrogen peroxide concentration is low, and the catalyst has the advantages of simple process, high catalytic activity, low cost and the like, can be used for effectively degrading lignin to prepare aviation oil intermediates, and has wide application prospects. And repeated cyclic utilization is realized.

The invention relates to a manufacturing method of high-density aviation fuel, in particular to an aviation fuel mixture based on monoterpenoids and a preparation method of the aviation fuel mixture. Comprising monoterpenoids, polyhydric alcohols and a catalyst which serve as raw materials, and the mass ratio of the raw materials to the polyhydric alcohols is 1: 1. The conversion rate is high, the treatment steps are reduced, the thermal stability and combustion gravimetric heat of the product are improved, and the method is suitable for preparing aviation fuel with high density, low viscosity and low-temperature performance; cyclization and hydrogenation are carried out through a one-pot method, a reaction container does not need to be transferred, and the operation is simple; according to the polyol solvent system, cyclization of the monoterpenoids becomes easier due to participation of polyol, and the conversion rate is increased; according to the dual-catalyst system, a combination of an acidic catalyst and a heterogeneous hydrogenation catalyst is used in a reaction container, so that efficient dehydration and hydrogenation reactions are ensured; the aromatic compound content in the fuel can be controlled by adjusting hydrogenation conditions.

Provided herein are systems and methods for converting CO2 and a reduction gas, such as H2 or a hydrocarbon, using a reduction catalyst and an aromatic catalyst into mixtures of paraffins, and aromatics for use as aviation fuel. The reduction catalyst and aromatic catalyst, and systems and methods incorporating the same, provide advantages over other methods in the art related to increased yield, catalyst stability and longevity.

The invention relates to an ammonia distillation-polymerization carbonization one-step preparation method and application of a carbon-modified copper-silicon catalyst. According to the method, carbon is introduced through aldol condensation on the basis of an ammonia distillation method Cu / SiO2 catalyst, and a carbon modified Cu / Si C-x catalyst is prepared; the proper carbon content can promote dispersion of copper on the surface, increase the proportion of Cu < + > / (Cu < + > + Cu0) and remarkably increase the number of Cu < + > sites on the surface of the catalyst, so that the catalytic performance of the catalyst is improved. According to the method, the purpose of carbon modification is achieved without any template agent or acid-base etching agent, a good methyl laurate hydrogenation effect is achieved, and meanwhile the catalyst preparation process is environmentally friendly.

A method of water decontamination includes contacting a MoO3@Al2O3—MgO nanocomposite material with an aqueous solution to form a reaction mixture. The aqueous solution includes one or more contaminants. The method further includes mixing the reaction mixture and collecting a filtrate. The filtrate has fewer of the one or more contaminants than the aqueous solution. The MoO3 content of the MoO3@Al2O3—MgO nanocomposite material ranges from 1 wt. % to 20 wt. % of the total weight of the MoO3@Al2O3—MgO nanocomposite material. The MoO3@Al2O3—MgO nanocomposite material has a surface area of greater than or equal to 50 m2 / g.

The invention belongs to the technical field of catalytic oxidation of carbon-containing industrial waste gas, and particularly relates to a Pd catalyst for catalytic combustion of carbon-containing waste gas as well as a preparation method and application of the Pd catalyst. The invention provides a Pd catalyst for catalytic oxidation of carbon-containing industrial waste gas such as CO and volatile organic pollutants VOCs. The Pd catalyst is obtained by compounding an amorphous CeO2 nano-cluster with a TiO2 substrate (marked as cCeO2 / TiO2) and indirectly regulating the form of Pd through gradient regulation of the content of the amorphous CeO2 nano-cluster by a sol-gel method on the basis of strong interaction of Pd and Ce species. The Pd catalyst prepared by the invention shows excellent low ignition temperature, high performance and certain universality in the catalytic combustion process of carbon-containing industrial waste gases such as CO and low-chain VOCs (Volatile Organic Compounds). In addition, the method for preparing the Pd catalyst is simple to operate and mild in condition, and has great industrial application potential and value.

Cu-based catalysts with excellent thermal stability for selective hydrogenation and a preparation method thereof are provided. The method includes: first, six mixed metal salts are instantaneously nucleated in an alkaline solution by the nucleation / crystallization isolation method, to prepare high-entropy composite metal hydroxides (H-LDHs) with uniform element distribution and similar metal proportions. Furthermore, well-crystallized high-entropy oxides (HEOs) are obtained based on the structural topology characteristics of H-LDHs, and a series of Cu-Mx / HEOs catalysts with flexible adjustable catalytic microzone geometries and electronic structures are obtained using the HEOs as precursors.

The invention relates to an SSZ-39 molecular sieve and preparation and application thereof.The preparation method comprises the following steps that 1, after water, an alkali source and a template agent are mixed, mesoporous Y zeolite and a silicon source are added, the mixture is stirred to be uniform, and the mixture is aged to be in a white gel shape; (2) transferring the obtained white gel into a reaction kettle, carrying out crystallization treatment, and filtering, washing, drying and calcining a crystallized product to obtain a Na-SSZ-39 molecular sieve; (3) carrying out ammonium ion exchange on the Na-SSZ-39 molecular sieve, filtering, washing, drying and calcining to obtain an H-SSZ-39 molecular sieve; and (4) carrying out copper ion exchange on the H-SSZ-39 molecular sieve, filtering, washing, drying and calcining to obtain the Cu-SSZ-39 catalyst. Aluminum used in the method is provided by mesoporous Y zeolite, the pure-phase SSZ-39 molecular sieve can be synthesized in a wide gel range, the crystallization time is shortened to 24 h, and after copper ion exchange, the pure-phase SSZ-39 molecular sieve shows high denitration activity in the selective catalytic reduction reaction of nitrogen oxide ammonia.

The invention discloses a preparation method of an adsorption and reduction bifunctional catalyst for denitration of tail gas of a diesel vehicle. The preparation method comprises the following steps: uniformly loading a Pd component and a Cu component on the surface of a molecular sieve to prepare a corresponding Pd-based molecular sieve and a corresponding Cu-based molecular sieve; and then coupling the Pd-based molecular sieve and the Cu-based molecular sieve according to a certain proportion by using a solid-phase grinding means to obtain the adsorption and reduction dual-functional Pd-Cu / SSZ-13 catalyst. The adsorption and reduction bifunctional Pd-Cu / SSZ-13 catalyst prepared by the method not only has excellent SCR activity at the temperature of 200 DEG C or above, but also has good PNA capacity at the temperature of 200 DEG C or below, can realize high-efficiency denitration of diesel vehicle tail gas in a full-temperature section, and can be widely applied to a diesel vehicle tail gas after-treatment system.

The invention relates to the technical field of catalysts, and discloses a preparation method of a supported catalyst for catalytic cracking oil slurry hydrogenation, and the preparation method comprises the following steps: S1, adding a phosphorus-containing compound into a carrier for modification: putting the carrier, phosphate and phosphoric acid into a round-bottom flask, adding water, and stirring for reaction to obtain a P element modified carrier; s2, dissolving a main active component of the catalyst in deionized water, then slowly adding into the P element modified carrier prepared in the step S1, and reacting to obtain a carrier loaded with the catalyst; and S3, roasting the catalyst-loaded carrier prepared in the step S2 to obtain the supported catalyst. According to the supported catalyst, a phosphorus compound modified carrier is adopted, and Ni-W-Mo or Ni-W active metal components are supported. The acid site of the carrier is optimized by adding the phosphorus element, and the surface acidity and the acid amount of the catalyst are optimized and adjusted by using a preparation process combining a microwave method and a co-impregnation method, so that the thermal stability of the catalyst is improved.

The invention belongs to the technical field of catalysts, and particularly relates to a supported Co-based catalyst with a nano molybdenum carbide auxiliary as well as a preparation method and application of the supported Co-based catalyst. The preparation method comprises the following steps: depositing molybdenum oxide on the surface of a carrier material by adopting an atomic layer deposition method, then carrying out carburizing treatment to obtain a molybdenum carbide catalyst, depositing cobalt oxide on the surface of the molybdenum carbide catalyst by adopting the atomic layer deposition method, and then carrying out reduction treatment to obtain the supported cobalt-based catalyst with the nano molybdenum carbide assistant. According to the preparation method provided by the invention, the size of molybdenum carbide and the dispersity and valence state of cobalt are controlled by regulating and controlling the deposition times of molybdenum oxide, and the prepared catalyst has excellent catalytic activity and stability in the hydroformylation reaction of long-chain olefin with the carbon atom number being greater than or equal to 5.

The invention discloses a method for synthesizing tetrahydrofuran from furfural in one step and a preparation method of a catalyst for the tetrahydrofuran. The catalyst is a bimetallic catalyst, bimetallic is M1 and M2, M1 is Pd, and M2 is selected from one of Pt, Rh, Ru, Ni, Cu, Co, Mn and Ce; the catalyst comprises an active component and a carrier, the bimetallic is the active component, and the carrier is selected from at least one of activated carbon, silicon dioxide, aluminum oxide, magnesium oxide, an S-1 molecular sieve, a ZSM-5 molecular sieve, a Beta molecular sieve, an MOR molecular sieve and a Y molecular sieve; based on the total weight of the catalyst, the loading capacity of M1 is 0.5-3.5%, and the loading capacity of M2 is 0.5-3.5%. The catalyst provided by the invention can be used in a reaction for preparing tetrahydrofuran through furfural hydrogenation, and can improve the conversion rate of furfural and the selectivity of tetrahydrofuran.