90results about How to "Increase the rate of catalytic reactions" patented technology

The invention discloses a microbial sludge deodorizer and a preparation method thereof. The preparation method comprises the following steps: conducting high-density culture on strains of streptococcus thermophilus, bacillus subtilis, aspergillus oryzae, photosynthetic bacteria, saccharomyces cerevisiae, lactobacillus casei and pseudomonas putida; dehydrating and drying the various single strains which are subjected to high-density culture, so that hypopus microbial dry powder is prepared; and mixing the streptococcus thermophilus, the bacillus subtilis, the aspergillus oryzae, the photosynthetic bacteria, the saccharomyces cerevisiae, the lactobacillus casei and the pseudomonas putida according to weight ratio of 10-20 parts of the streptococcus thermophilus, 10-15 parts of the bacillus subtilis, 20-30 parts of the aspergillus oryzae, 10-15 parts of the photosynthetic bacteria, 10-20 parts of the saccharomyces cerevisiae, 10-15 parts of the lactobacillus casei and 10-20 parts of the pseudomonas putida, so that the microbial sludge deodorizer is obtained. The microbial sludge deodorizer provided by the invention is applicable to garbage deodorization; and in comparison with the prior art, the microbial sludge deodorizer is low in production investment, low in production cost and convenient to use, and moreover, the microbial sludge deodorizer is good in deodorizing effect.

The invention discloses a method for preparing alpha, omega-bis(aminopropyl)polydimethylsiloxane. A siliconate catalyst is prepared through alkali compound which is provided by the preparation method and then the catalyst has a good compatibility in the reaction solution, thus improving the catalytic reaction rate and obviously shortening the equilibrium reaction time. Raw materials are dehydrated before the reaction to eliminate the interference of end-capped hydroxy group and increase reaction efficiency. The final product synthesized has the characteristics of high amino termination yield, good stability and the like. The obtained product can be used as a basic raw material for siloxane-organic block copolymer and can also be used as an excellent conditioning agent in the hair care composition.

The invention discloses a preparation method of L-proline-loaded temperature/magnetism double responsive functional hybrid microspheres. The technical point is as follows: a temperature-sensitive amphipathic block polymer is obtained by polymerizing functional L-proline ProlA, a temperature-sensitive monomer N-isopropylacrylamide NIPAM and a hydrophilic monomer oligomeric ethylene glycol acrylate OEGA by virtue of a reversible addition fragmentation chain transfer (RAFT) polymerization method and is loaded to magnetic Fe3O4 nanoparticles by virtue of a ''click chemistry'' method so as to obtain the temperature/magnetism double responsive hybrid microspheres. The hybrid microspheres can be used for catalyzing direct asymmetric Aldol reaction in a water phase, and the temperature of a reaction system is higher than a lower critical solution temperature (LCST) of the block polymer, so that the improvement of the catalytic efficiency of the Aldol reaction and the release of organic products are benefited; and by virtue of the magnetism, the hybrid microspheres can be efficiently separated and recycled and repeatedly used.

The invention provides a nitrogen-doped carbon-based metal monoatomic catalyst as well as a preparation method and application thereof. A hard template method is selected to prepare the metal monoatomic catalyst, an amino-containing organic body and a chlorine-containing organic body are used as polymerization monomers, a transition metal salt is used as a metal source, a ratio relationship of a template, the organic monomers and the metal salt and reaction conditions are precisely regulated and controlled, so that in-situ polymerization of the organic monomers on the surface of the template and simultaneous chelating of transition metal ions can be realized to prepare the highly exposed monoatomic metal catalyst. The preparation method of the catalyst provided by the invention can ensurethe load capacity of the monoatomic metal to the greatest extent, and the condition that a nitrogen-doped carbon material wraps a metal oxide can be avoided through reasonable regulation and control of reparation conditions; and in addition, the Fenton catalyst prepared by the method has the advantages of high activity, a low metal loss rate and strong regeneration ability.

This invention relates to carbonylation prodn. of acetic acid with an additional forced cooling reactor between reactor and flash column, under pressure of 20-40 bar and temp. of 170 deg.C to 220 deg.C, and controlling feeding ratio of flash liquid to methanol=7-20. So, now the prodn. needes no removing heat by flash column. And rectifying still is not the neck of said prodn, and it can keep stable rhodium catalyst.

The invention discloses a CdS/ZnO composite piezoelectric photocatalyst and a preparation method and application thereof. The method comprises the steps that firstly, a ZnO nanorod is synthesized through a solvothermal method, and then a chemical bath is carried out to synthesize the CdS/ZnO composite piezoelectric photocatalyst by taking the ZnO nanorod as a precursor through the action of electrostatic adsorption. The catalyst is a piezoelectric photocatalyst formed by compounding CdS and ZnO which have piezoelectric properties, the catalyst utilizes a piezoelectric electric field to promotethe separation of photo-generated carriers for enhancing the photocatalytic activity, the interior and space separation of the photo-generated carriers is also achieved, thereby reducing the recombination of the photo-generated carriers and increasing the utilization rate of the solar energy, and the piezoelectric photocatalytic rate reaches 5.477 min<-1>, which is four times of the photocatalytic efficiency of CdS alone. The CdS/ZnO composite piezoelectric photocatalyst and the preparation method and application thereof have the advantages that the raw materials are easy to obtain, the preparation method is simple, the operation is convenient, the stability of the composite material is better, and a feasible strategy is provided for improving the photocatalytic performance.

The invention relates to a catalyst for preparing methyl alcohol from syngas. The preparation method of the catalyst comprises the following steps: putting a CuO/ZnO/Al2O3 catalyst into a container, adding a rhodium salt solution with the same volume, immersing for 6-48 h, and then drying for 8-16 h at 80-120 DEG C; roasting the obtained product for 3-6 h at 300-400 DEG C to obtain the catalyst comprising 40-65 percent of Cu, 25-40 percent of Zn, 2-20 percent of Al and 0.1-0.2 percent of Rh in molar ratio. The catalyst has the advantages of high activity and good stability.

The invention relates to a preparation method of a dopamine stabilized Pickering emulsion and application thereof on immobilized enzymes. The preparation method is characterized by that hydrophobic modified SiO2 particles are used as a stabilizer, n-heptane is used as an oil phase, a Tris buffer is used as an aqueous phase, and a high speed homogenizer is used for stirring to obtain a SiO2 particle stabilized Pickering emulsion; dopamine is added into the SiO2 particle stabilized Pickering emulsion, and the obtained emulsion is incubated in a water bath shaker at room temperature to produce ablack Pickering emulsion stabilized by both SiO2 and polydopamine. Enzymes are immobilized in an emulsion aqueous phase to determine the stability and application performance of the Pickering emulsion. The prepared dopamine stabilized Pickering emulsion consists of SiO2 nanometer particles and a polymer coating layer, so that the stability is good, and coating of various enzymes can be realized, thereby making the immobilized enzymes have very good thermal stability, storage stability and reusability; and the Pickering emulsion is low in cost, and the preparation method is easy for operation,so that the Pickering emulsion has very good economic feasibility and practicality.

The invention discloses a supported catalyst for coal gasification. The catalyst comprises a catalyst active component, a catalyst promoter and a carrier, wherein the catalyst active component refers to alkali metal carbonate, and accounts for 5-20% of the total weight of the catalyst; the catalyst promoter refers to a composite oxide, and accounts for 20-40% of the total weight of the catalyst, and the structure of the catalyst promoter is AxA'1- xByB'1-yO3; the carrier refers to silica or gamma-Al2O3, and accounts for 40-75% of the total weight of the catalyst. According to the invention, in a mode of adding the catalyst promoter, the catalytic activity of the active component for coal gasification is promoted, and the volatilization loss of the active component is suppressed, and meanwhile, the catalyst promoter is supported on the carrier with a higher specific surface and an enough strength, so that the original structure and catalytic activity of the catalyst after being reacted are still kept, and then the catalyst can be recycled so as to achieve the purpose of reutilization.

The invention provides a preparation method of an industrial waste gas purification catalyst. The preparation method can improve the sintering resistance and catalytic activity of the catalyst and comprises steps as follows: 1) one or more of aluminum isopropoxide, an alkaline-earth metal precursor, a rare-earth metal precursor and a transition metal precursor are dissolved in a solvent; 2) activated alumina, silicon nitride and a dispersant are added and mixed, and suspension slurry is formed; 3) a catalytic coating is formed by coating a catalyst carrier with the suspension slurry and dried; 4) the catalytic coating is placed in a flowing reductive atmosphere for roasting; 5) the catalyst coating is immersed in a precious metal solution for impregnation, dried and roasted at the roasting temperature of 400-700 DEG C, and a final product is formed.

The invention belongs to the technical field of industrial catalysis and provides a method for synthesizing dimethyl carbonate and co-producing ethylene glycol by catalyzing transesterification with a loaded ionic liquid. The supported ionic liquid is based on chlorine-containing resin particles as a carrier, and an ionic liquid in which a hydroxyl anion structural unit and an imidazolium cation structural unit are paired as a catalytic active center, and is supported by a chemical bond to prepare a functionalized supported ionic liquid catalyst. It is used to catalyze the transesterification reaction of ethylene carbonate and methanol to simultaneously synthesize two chemical products of dimethyl carbonate and ethylene glycol. The catalyst preparation process is simple and easy to operate, and the catalyst can be recovered by simple filtration, which is very beneficial to solve the problem of difficult separation of the product and the catalyst. It will have great application potential and market prospect.

The invention discloses a preparation method of a hollow structure Co3O4/CeO2 nanoparticle loaded nitrogen doped carbon nanofiber material and application thereof. The preparation method comprises thefollowing steps: 1) preparing a CO<2+>/Ce<3+>/PVP mixed sol; 2) electrospinning the CO2+/Ce3+/PVP mixed sol to obtain a solid carbon fiber film; and 3) preoxidizing the solid carbon fiber film in anair atmosphere of 200-300 DEG C, performing heat treatment in an inert atmosphere of 400-1000 DEG C with programmed temperature rise, and obtaining the hollow structure Co3O4/CeO2 nanoparticle loadednitrogen doped carbon nanofiber composite material by utilizing the Kirkendall effect of nano materials. The preparation method is low in cost, simple and universal. The prepared material is a one-dimensional carbon nanofiber material; hollow Co3O4/CeO2 composite nanoparticles are uniformly embedded in carbon nanofiber; and the material can be used as an electrolytic water oxygen evolution electrocatalytic material and has higher activity and excellent stability.

The invention discloses a graphene composite comprising nitrogen-doped reduced graphene oxide and nitrogen-doped titanium dioxide nanowires, wherein the length-diameter ratio of the titanium dioxide nanowires is larger than 10. The one-dimensional titanium dioxide nanowires are selected as an active component, have better electronic transmission channels and are beneficial to acceleration of electronic transmission and increase of the reaction rate. Meanwhile, the one-dimensional titanium dioxide nanowires can better prevent stacking of graphene sheets, more effectively use the characteristic of large specific surface of graphene, enlarge the reaction contact area and increase the catalytic reaction rate. A preparation method of the graphene composite adopts a simple process, raw materials are easy to store, the reaction is mild, energy consumption is lower, and the method is suitable for industrial application. Meanwhile, the titanium dioxide nanowires with controllable morphology are prepared firstly, then the graphene composite is prepared, the product cost is reduced effectively, and product quality controllability can be realized.

The invention provides a NiS/NiO heterojunction-loaded nitrogen-doped carbon nano composite material and a preparation method and application thereof. The preparation method comprises the following steps: S1, preparing Ni < 2 + >/PVP mixed sol; S2, performing electrostatic spinning on the Ni < 2 + >/PVP mixed sol to obtain a solid carbon fiber film; and S3, pre-oxidizing the solid carbon fiber film in an air atmosphere, and sequentially carrying out heat treatment in an inert atmosphere, oxidation treatment in the air atmosphere and sulfuration vapor deposition to obtain the NiS/NiO heterojunction-loaded nitrogen-doped carbon nano composite material. PVP selected in the method is cheap and easy to obtain, and compared with a traditional method for preparing the water electrolysis oxygen evolution electrocatalyst material, the method is simple and feasible in process, low in cost and easy to operate, and large-scale production can be achieved.

The invention relates to the technical field of solid solution catalysts, in particular to a Ce-Mn-based solid solution catalyst and a preparation method and application thereof. The preparation method of the Ce-Mn-based solid solution catalyst provided by the invention comprises the following steps: mixing a mixed solution of soluble cerium salt and potassium permanganate with soluble manganese salt, adjusting the pH value to be greater than 7, sequentially performing oxidation-reduction reaction and aging, and calcining the obtained solid to obtain the Ce-Mn-based solid solution catalyst, wherein the calcination temperature is 400-600 DEG C, and the calcination time is less than 8 hours. The preparation method is simple and low in cost, and the prepared solid solution catalyst has good catalytic activity and catalytic stability and is suitable for large-scale industrial application.

The invention provides a carbon-coated transition metal nano composite material containing alkaline-earth metals and a preparation method and application thereof. The nano composite material comprisesa core-shell structure with a shell layer and an inner core, the shell layer is a graphitized carbon layer containing alkaline earth metals and oxygen, and the inner core is transition metal nano particles. Alkaline earth metals of the shell layer of the nano composite material and transition metals of the inner core generate a synergistic effect, thus the catalytic performance of the nano composite material becomes better; and the nano composite material shows good repeatability, high activity and high selectivity when being used as a catalyst, and can be applied to various catalytic reactions, such as catalytic oxidation reaction and catalytic hydrogenation reaction.

The invention discloses a platinum-alumina composite catalyst for dehydrogenation of an alkane. The catalyst is a spherical gamma-Al2O3 carrier, and supports an active component Pt and auxiliary agents Sn, Li and Yi, Pt loading is 0.1%-0.2%, and the total loading of Sn, Li and Yi is 1%. The catalyst is prepared by a batch autoclave process, the carrier is modified firstly, the crystal form and surface properties of alumina are modified, which is more favorable for the loading of an active component, the active component and the auxiliary agents are impregnated in two steps, and the auxiliary agents can strongly interact with the active component, which effectively increases the dispersion of the metal Pt, reduces the carbon deposit on a catalyst surface, and improves the selectivity and yield of the olefin, thereby enhancing the stability and service life of the catalyst. Test results show that the catalyst has good catalytic activity in the dehydrogenation reaction of propane and butane, the propane conversion rate is 35% to 32% in 72 hours, and the propylene selectivity is 90% to 95%.

The invention discloses a preparation method of a catalyst for high efficient catalytic degradation of harmful gas PH3. According to the preparation method, low cost natural halloysite nano tubes (HNTs) are taken as the carrier; nickel chloride, ferric chloride, and ferrous sulfate are taken as the precursors; based on a chemical plating technology, and a nickel nano clad layer is plated on the halloysite nano tubes (HNTs) to form a one-dimensional shell/core structure. Then through a co-precipitation method, Fe3O4 nano particles are loaded on the nickel clad layer surface in a dotted mode toform a one dimensional shell/dual core structure. The preparation method has the advantages that there is no severe requirement on physical conditions, the method is simple, the price of HNTs is low,and the efficiency of using the catalyst to degrade PH3 catalytically is high, and the service life is long.

The invention relates to the technical field of functional materials and particularly relates to a preparation method of a supported Pd catalyst. The preparation method of the supported Pd catalyst comprises the following steps: dissolving ZrOCO3, Ce(NO3)3, La(NO3) and Al(NO3), uniformly mixing, carrying out titration by taking ammonia water as a precipitant, carrying out suction filtration after titration, drying, and roasting the obtained powder at 600 DEG C for 3 hours, so as to obtain a catalyst supporter, wherein the ratio of n(Ce) to n(Zr) to n(La) to n(Al) is 4.5 to 4.5 to 1 to 10; and respectively dipping the catalyst supporter into water solutions of Pd and alkaline earth nitrate by adopting an equal pore volume dipping method, drying, roasting to obtain catalyst powder containing 2% of Pd and 5% of MgO, grinding the obtained catalyst powder into slurry, coating a cordierite honeycomb ceramic matrix with the slurry in a coating quantity of 140g/L, drying, and roasting at 550 DEG C for 3 hours, so as to obtain the supported Pd catalyst. According to the supported Pd catalyst, the dispersity of an active component Pd on the surface of a supporter is obviously improved, and the reducing property of the catalyst is improved; and the transfer of active oxygen between metals and the supporter is accelerated, and the catalytic reaction rate is increased.

The invention discloses a NiPd/Ni anchored nitrogen-doped carbon nanosheet composite material, and a preparation method and application thereof. The NiPd/Ni anchored nitrogen-doped carbon nanosheet composite material takes a nitrogen-doped carbon nanosheet with a three-dimensional nanostructure as a carrier, and NiPd alloy and Ni metal elementary substance nanoparticles are uniformly anchored on the carrier. The method is simple and easy to implement, raw materials are low in cost, and large-scale production can be achieved. The NiPd/Ni anchored nitrogen-doped carbon nanosheet composite material prepared by the method disclosed by the invention has a three-dimensional nanostructure (nitrogen-doped carbon nanosheets), and NiPd alloy and Ni metal elementary substance nanoparticles with superfine particle sizes (about 13.0 nm) are uniformly anchored on the carbon nanosheets. The material can be used as an alkaline bifunctional oxygen electro-catalytic material, and has excellent activity and stability.

The invention discloses a method for preparing a Fe-doped Mn3O4 carbon-nitrogen material with a hollow nano-frame structure and the application of the material in an oxygen reduction reaction and a zinc-air battery. The method comprises the steps of (1) separately preparing a Fe(CN)6<3->/PVP solution and a Mn<2+> solution, (2) uniformly mixing the Fe(CN)6<3->/PVP solution and the Mn<2+> solution and standing to obtain KMnFe(CN)6 khaki Prussian blue similar precipitation, and (3) performing alkali washing on KMnFe(CN)6 solid powder in a NaOH solution and raising the temperature to perform thermal processing at 250 DEG C to 350 DEG C in an inert atmosphere to obtain the Fe-doped Mn3O4 carbon-nitrogen material with the hollow nano-frame structure. The preparation method of the invention has the advantages of low cost and simple and universal use, the obtained material has the open hollow nano-frame structure, the material can be used as an electrocatalytic material of oxygen reduction reaction, and the material has high activity and excellent stability energy and can be applied as a positive electrode material of the zinc-air battery.