20 results about "Deposition precipitation" patented technology

The application provides a multi-level hole molybdenum-bismuth composite metal oxide catalyst and a preparation method thereof. 12 Bi 1.5 Fe 1.5 Co5Ce x Gd y K 0.5 O / TiO2, wherein 0 < x <= 1.2 and 0 < y <= 0.3. The catalyst comprises a carrier and a composite metal oxide, the composite metal oxide is dispersed in the carrier, the carrier is a multi-level hole TiO2, and the composite metal oxide is a composite oxide of molybdenum-bismuth-iron-cobalt-potassium and at least two kinds of rare earth metals. The catalyst is prepared by a deposition precipitation method. The multi-level hole molybdenum-bismuth composite metal oxide catalyst prepared by the application has a large specific surface area and contains at least two kinds of rare earth metals, which promotes high dispersion of active components, a synergistic effect between the rare earth metals, an increase in the number of active oxygen species and an increase in the selectivity of the catalyst for selective oxidation products.

This invention discloses a method for preparing 1,3-propanediol by hydrogenation of methyl 3-hydroxypropionate. Using manganese-doped layered copper silicate prepared by deposition precipitation as a precursor, a highly dispersed and stable copper-based catalyst is obtained through reduction. The manganese doping and layered copper silicate species enhance the interaction between copper and the support, improving the dispersion of active copper species. Simultaneously, the layered copper silicate increases the difficulty of copper species reduction, thereby improving the Cu content of the catalyst. + / Cu 0 The strong metal-support interaction and the dispersing effect of manganese can effectively inhibit the migration and aggregation of active copper species during the reaction, thus improving the stability of the catalyst. The copper-based catalyst prepared in this invention exhibits high conversion and 1,3-propanediol selectivity in the hydrogenation reaction of methyl 3-hydroxypropionate, with high catalytic activity and stability, and few byproducts, showing good prospects for industrial application.

A catalyst for coupling pyridine to prepare 2,2-bipyridine and a preparation method thereof, relates to the technical field of catalyst preparation. The catalyst takes nickel oxide as an active component, enhances the basicity of the catalyst surface by introducing an auxiliary element, loads the active component on alumina by a deposition precipitation method, and is prepared by kneading and extruding into a strip. The method is simple in preparation and low in cost. The obtained catalyst can make the conversion rate of pyridine reach 14.98% and above under low temperature reaction conditions of 110 DEG C, the selectivity of 2,2-bipyridine is as high as 80% and above, and the catalyst has good catalytic activity and application prospect.

The present application provides a kind of catalyst for furfural hydrogenation and its preparation and application.The catalyst is composed of metal copper, nickel silicate and carrier silicon oxide.The metal component copper accounts for 10-30% of the total weight of catalyst, and the nickel silicate accounts for 10-40% of the total weight of catalyst.The catalyst of the present application is prepared by deposition precipitation method.The catalyst of the present application is applied to the reaction conditions required for furfural hydrogenation to 2-methylfuran, and has superior reaction performance, specifically high furfural conversion rate, high 2-methylfuran selectivity and excellent long-period stability, and has certain industrial application prospect.

The application discloses a method for preparing di-tert-butyl dicyclohexyl-18-crown-6 by hydrogenating di-tert-butyl benzene-18-crown-6, wherein the catalytic system comprises a high-loading rhodium catalyst with a content of 3-10 wt% and a low-loading rhodium catalyst with a content of 0.05-1 wt%, which are prepared respectively and physically mixed to form active site distribution with different metal surface densities, and the catalyst is prepared by a deposition precipitation method so that Rh particles are uniformly dispersed on the surface of an alumina carrier. The system can realize efficient aromatic crown ether hydrogenation under mild conditions and has a good industrial application prospect.

The application provides a low-temperature high-activity supported Ru-based catalyst, a preparation method and application, the method is characterized in that a manganese oxide carrier is synthesized by a precipitation method, the manganese oxide carrier is loaded by a deposition precipitation method, and a supported Ru-based catalyst is obtained. ‑1 ·h ‑1 Under high space velocity conditions, a CO2 conversion rate of 94.9% and a selectivity of 100% are achieved, the bottleneck of insufficient low-temperature activity of existing catalysts is broken through; meanwhile, the catalyst exhibits excellent long-term stability, after continuous operation for 100 hours at 180 DEG C, the CO2 conversion rate attenuation is less than 0.5%, and the selectivity is always kept at 100%, laying a solid durability foundation for industrial application.

The application discloses a hollow spherical composite catalyst Pt / MnO2 / MnCo2O4, wherein the MnCo2O4 is a hollow sphere with a spinel structure composed of manganese and cobalt double transition metal oxides, the diameter of the hollow sphere is distributed in 1-2 mu m, and the hollow sphere has a porous structure with many cavities in the inside. MnO2 nanosheet microspheres are uniformly attached to the MnCo2O4, and the diameter of the MnO2 nanosheet microspheres is 95-105 nm. Pt nanoparticles with a particle size of 2-20 nm are uniformly loaded on the MnCo2O4 and the MnO2. The Pt / MnO2 / MnCo2O4 is synthesized by a solvothermal method and calcination in an air bath to synthesize a hollow spherical MnCo2O4 carrier, and then the MnO2 and the Pt nanoparticles are loaded on the surface of the MnCo2O4 by a deposition-precipitation method and an in-situ reduction method. The hollow spherical composite catalyst can catalyze degradation of tetracycline in polluted water at room temperature, and the catalytic efficiency can still be maintained after repeated use.

The invention relates to a preparation method and application of a rare earth element-containing precious metal tritium oxidation catalyst. The preparation method comprises the following steps: preparing a gamma-Al2O3 carrier containing rare earth elements; and loading noble metal on the surface of the gamma-Al2O3 carrier by adopting a deposition-precipitation method to obtain the catalyst, immersing the catalyst into a solution containing a nonionic surfactant for surface modification; and roasting the modified catalyst to obtain the tritium oxidation catalyst. According to the invention, the catalytic performance under a high-humidity condition is improved by firstly loading the rare earth element, then loading the noble metal and finally modifying through the nonionic surfactant, and the low-temperature activity of the catalyst is improved through a composite active site formed by loading the rare earth element and the noble metal; and meanwhile, the reaction activity under the condition of low tritium concentration and the reaction activity under the conditions of high humidity and large air volume are also improved.

The utility model discloses a construction site water resource automatic collection and utilization system which comprises a foundation pit rainfall and rainwater collection system and a water resource automatic collection and utilization system, the foundation pit rainfall and rainwater collection system collects and precipitates foundation pit rainfall, and the water resource automatic collection and utilization system conveys and utilizes the precipitated rainfall. And the precipitation amount is supplemented through municipal water. The collection and utilization system fully considers fire-fighting water when a fire occurs, is high in safety, recycles water pumped from a rainfall station and rainwater, saves a large amount of water resources, is obvious in economic benefit, has complete functions of a water inlet and outlet control and monitoring system, can meet temporary water system control of most project departments, is convenient to disassemble and assemble and can be repeatedly used, and is convenient to popularize and use. The intelligent construction site management system has the advantages that the concept of an intelligent construction site is implemented, automatic collection of foundation pit dewatering and rainwater and full-automatic control of a water tank water inlet system and a constant-pressure water supply system are achieved, the informatization level of construction site management is improved, and the system is high in practicability and can be used for site construction.

This invention relates to a barium carbonate-supported nickel-based methanation catalyst, its preparation method, and its application. The catalyst comprises 90% barium carbonate support and 10% nickel by mass. The catalyst provided by this invention is based on BaCO3 prepared by precipitation, using a deposition-precipitation method to prepare 10wt% Ni / BaCO3. During pretreatment and reaction, a support coating layer forms on the nickel nanoparticles. This coating layer, through its own dissociation and regeneration, promotes CO2 adsorption, thereby increasing the methane formation rate. Simultaneously, the coating layer immobilizes the nickel particles, improving stability. Therefore, the catalyst prepared by this invention possesses numerous advantages, including structural stability, good thermal conductivity, high-efficiency CO2 conversion and CH4 selectivity, high permeability and high activity, high mechanical strength, ease of molding and filling, and high throughput with low pressure drop. It is an excellent catalyst for the carbon dioxide hydrogenation to methane reaction and is suitable for industrial applications.

The invention relates to the technical field of electrochemical catalytic reduction of carbon dioxide, in particular to a gas diffusion electrode plate, a preparation method and application thereof, an electrolysis device and application thereof. The gas diffusion electrode plate comprises a conductive substrate, and a conductive agent, a binder and a catalyst which are loaded on the conductive substrate, the catalyst comprises a rod-shaped CeO2 carrier, Cu and Ag, the Cu and the Ag are loaded on the surface of the carrier, and based on the total weight of the catalyst, the content of the Cu is 5wt%-30wt%, the content of the Ag is 0.1 wt%-2wt%, and the content of the rod-shaped CeO2 carrier is 68wt%-94.9 wt%; cu and Ag are loaded on the rod-like CeO2 carrier through a deposition-precipitation method; the reaction overpotential can be reduced, the ethylene Faraday efficiency is improved, the catalyst stability is high, and the cycle life can be prolonged.

The present invention provides a method for manufacturing a catalyst that minimizes the content of impurities by adding a repulping step during the washing stage, and a catalyst manufactured thereby. [Solution] The present invention discloses a method for producing a catalyst, comprising: (a) the step of producing a first slurry by deposition-precipitation of an active metal precursor on a support; (b) the step of filtering the first slurry to obtain a first catalyst cake; (c) the step of primary repulping the first catalyst cake to produce a second slurry; (d) the step of filtering the second slurry to obtain a second catalyst cake; (e) the step of secondary repulping the second catalyst cake to produce a third slurry; (f) the step of filtering the third slurry to obtain a third catalyst cake; and (g) the step of drying and calcining the third catalyst cake. According to the present invention, the content of impurities can be minimized, high activity and a large surface area can be ensured by the deposition-precipitation (DP) method, and the activity of the catalyst for the hydrogenation reaction can be improved.

This invention discloses an energy-saving and low-carbon composite catalyst for coal gasification and its preparation method, belonging to the field of coal gasification and catalytic chemistry technology. The catalyst comprises a cobalt-molybdenum-based heterojunction nanocomposite active phase, a core-shell structured composite support, and an alkaline earth-rare earth composite additive. The composite support consists of a thermally conductive ceramic particle core and a mesoporous cerium-zirconium composite oxide solid solution shell completely encapsulating it. The preparation method includes: firstly, constructing the core-shell support and loading the additive through a deposition-precipitation method and calcination in an inert atmosphere; then, sequentially impregnating it with molybdenum followed by cobalt; and finally, programmatic in-situ carbonization or nitriding under a specific atmosphere to form Co-Mo. x C y Or Co‑Mo x N y Heterojunction active phase. This catalyst can achieve high efficiency catalysis under intermediate temperature conditions, with high syngas selectivity, and maintains high stability under harsh sulfur-containing conditions over a long period of time, while also having the advantages of significant energy saving, high carbon efficiency and long lifespan.

This invention belongs to the field of ammonia decomposition catalyst preparation technology, specifically relating to an ammonia decomposition catalyst using in-situ formed BaCeO3 as a promoter, its preparation method, and its application. The ammonia decomposition catalyst prepared by this invention uses rare earth oxides as a support and, through a deposition-precipitation method and synergistic effect with Ba promoter, in-situ forms a BaCeO3 perovskite structure during the ammonia decomposition catalytic reaction, significantly improving its low-temperature activity. Experiments show that the catalyst achieves an H2 yield of 28.8 mmol·g at 500℃. cal ‑1 ·min ‑1 It also exhibits excellent stability and is suitable for efficient ammonia decomposition to produce hydrogen.

The present invention relates to the field of supported catalysts, and discloses a supported catalyst prepared by a deposition-precipitation method, a preparation method thereof, and a method for preparing octenol, the supported catalyst comprises a carrier and an active component supported on the carrier, the supported catalyst is characterized in that the carrier is Al2O3, the active component is copper, and the catalyst is a metal oxide. Based on the total weight of the supported catalyst, the content of the copper is 15-40wt%. The supported catalyst has small-size active sites uniformly distributed on the surface of the carrier, relatively high specific surface area and metal dispersity, and can remarkably improve the conversion rate of octenal and the yield of octenol.

The invention discloses a phosphorus oxychloride synthesis process based on a metal organic framework supported catalyst, which comprises the following steps: selecting a metal organic framework material with high specific surface area and excellent thermal stability as a carrier, and adjusting the type and length of an organic ligand to control the pore size of the metal organic framework material. The preparation method comprises the following steps: preparing a metal-organic framework material to be matched with molecular sizes of chlorine and phosphorus pentoxide in a phosphorus oxychloride synthesis reaction, loading noble metal into pore channels of the metal-organic framework material by adopting an improved deposition-precipitation method to form a high-dispersity metal catalyst, and then performing surface modification by virtue of concentrated sulfuric acid. A metal organic framework material with high specific surface area and good thermal stability is selected as a carrier, high-dispersity noble metal nanoparticles are loaded to prepare an efficient catalyst, phosphorus pentoxide and chlorine can be promoted to react at low temperature to generate phosphorus oxychloride, meanwhile, the system realizes solvent-free reaction, emission of volatile organic compounds is avoided, and the catalyst is suitable for industrial production. Green chemical requirements are met, and atmospheric pollution is reduced.

The present invention can facilitate the reduction of nickel by using copper as an accelerator when a hydrogenation catalyst including nickel is produced by using a deposition-precipitation (DP) method. According to an embodiment of the present invention, provided is a catalyst for a hydrogenation reaction that includes 40-80 parts by weight of nickel as a catalyst active component, 0.01-5 parts by weight of copper as an accelerator, and 10-30 parts by weight of a silica support based on 100 parts by weight of the entire catalyst. Therefore, although a high content of nickel is supported, the catalyst has a small crystal size of an activated metal and a high degree of dispersion and provides excellent hydrogenation activity. In addition, silica with a controlled particle size distribution is used as a support, so that the produced catalyst also has a uniform particle size distribution and is suppressed from being smashed at a high-speed rotation in the hydrogenation reaction, thereby providing a high filtration rate.

The invention discloses a preparation method and application of a carbon-based ammonia cracking hydrogen production catalyst, and the preparation method comprises the following steps: carrying out two-stage pretreatment of acid pickling and potassium salt solution dipping activation on a nano onion carbon carrier to obtain an activated carrier K-CNO '; and carrying out a reaction on a cobalt salt, a magnesium salt, urea and the activated carrier under a hydrothermal condition by adopting a uniform deposition precipitation method, and carrying out precipitation, filtration, washing, drying and calcination to prepare the final catalyst CoxMg / K-CNO '. Oxygen-containing functional groups are introduced to the surfaces of the CNOs through acid pickling, the alkalinity and specific surface area of the carrier are improved through potassium activation, and the carrier, the active component Co and the auxiliary agent MgO generate a strong synergistic effect, so that high dispersion, strong stability and abundant surface alkaline sites of a Co-based active center are realized. The catalyst shows excellent low-temperature catalytic activity and stability in ammonia decomposition hydrogen production reaction, the ammonia conversion rate reaches up to 99.6% under specific conditions, and the catalyst can stably run at 500 DEG C for a long time.

The invention provides a low-temperature high-activity supported Ru-based catalyst as well as a preparation method and application thereof, according to the method, a manganese oxide carrier is synthesized by a precipitation method, and the manganese oxide carrier is supported by a deposition-precipitation method to obtain the supported Ru-based catalyst. By optimizing the synergistic effect of the MnO carrier and the Ru active component, under the conditions of low temperature of 180 DEG C and high space velocity of 36000 mL.g <-1 >. H <-1 >, the CO2 conversion rate as high as 94.9% and the selectivity of 100% are realized, and the bottleneck of insufficient low-temperature activity of the existing catalyst is broken through; meanwhile, the catalyst shows excellent long-term stability, after continuous operation for 100 hours at 180 DEG C, the CO2 conversion rate attenuation is less than 0.5%, the selectivity is always kept at 100%, and a solid durability foundation is laid for industrial application.

The present application relates to the field of environmental protection and environmental pollution control technology, and particularly relates to a preparation method of a low-temperature synergistic catalytic oxidation chlorine-containing VOCs catalyst, the catalyst and application thereof, the preparation method is as follows: cerium salt and cobalt salt are dissolved in water to prepare a CeCo precursor solution, trimesic acid is dissolved in a solvent to prepare an organic ligand solution, the CeCo precursor solution is added to the organic ligand solution to react, and a CeCo-MOF precursor is obtained through post-treatment, and then the CeCo-MOF precursor is calcined to obtain a CeCoO x -MOF, then an ammonium carbonate solution is added to a CeCoO x -MOF suspension, a RuCl3 solution is added dropwise through a deposition precipitation reaction, and a Ru / CeCoO x -MOF catalyst is obtained through post-treatment, reduction atmosphere heat treatment and air atmosphere calcination. The preparation method provided in the present application is simple, and the prepared catalyst has excellent low-temperature synergistic catalytic activity and good stability for chlorine-containing VOCs.