50 results about "Carbon nanotube supported catalyst" patented technology

The invention discloses a metal phthalocyanine/carbon nanometer pipe compound catalyst, a method for preparing the same and a lithium/thionyl chloride battery using the same, wherein the metal phthalocyanine/carbon nanometer pipe compound catalyst is prepared by evenly and closely loading metal phthalocyanine compounds on a carbon nanometer pipe; and the metal phthalocyanine/carbon nanometer pipe compound catalyst is mixed with carbon black and a binding agent, and the mixture subjected to forming and drying to prepare an anode carbon plate of the lithium/thionyl chloride battery using the catalyst. The metal phthalocyanine compounds are evenly and closely loaded on the carbon nanometer pipe. On one hand, the electrically discharged product of a LiCl film can be loosened by the catalysis of the metal phthalocyanine compounds; on the other hand, a network structure is built up in the carbon anode of the carbon nanometer pipe, which facilitates the electric communication of electrolytes and the improvement of electric conductivity of the electrodes. Due to the synergetic effect of the metal phthalocyanine compounds and the carbon nanometer pipe, the operating voltage of the lithium/thionyl chloride battery is improved. The method has advantages of simple process, simple operation, the suitability for industrialized production and obvious practical values and economic benefits.

Metal-free fuel cell cathodes having a catalytic layer of vertically-aligned, nitrogen-doped carbon nanotubes (VA-NCNTs) are provided. The fuel cell cathodes comprise a cathode body, a binder layer attached to an outer surface of the cathode body, and the catalytic layer, which is supported by the binder layer. The binder layer may comprise a composite of a conductive polymer and doped or undoped nonaligned carbon nanotubes. In a method for forming the fuel cell cathodes, the VA-NCNTs may be formed by pyrolysis of a metalorganic compound and integration of the nanotubes with nitrogen. The binder layer is applied, and the resulting supported nanotube array may be attached to the cathode body. Fuel cells comprising the fuel cell cathodes are provided. The fuel cell cathodes comprising VA-NCNTs demonstrate superior oxygen-reduction reaction performance, including for electrocatalytic activity, operational stability, tolerance to crossover effects, and resistance to CO poisoning.

The invention relates to a nickel cobalt oxide/carbon nanotube composite catalyst, a preparation and an application thereof. The bi-functional catalyst comprises carbon nanotube and nickel cobalt oxide NiCo2O4 spinel; according to the preparation, nickel acetate, cobalt nitrate and carbon nanotube are respectively weighed, and then dissolved in ammoniacal liquor and the obtained material is performed with ultrasonic dispersion, then is subjected to a hydrothermal reaction at temperature of 140-160 DEG C for 3-6 hours, the obtained product is cooled to room temperature, cleaned and dried, calcined and ground to obtain the bi-functional catalyst. The invention also provides an application of the bifunctional catalyst in preparation of an air electrode of a metal air battery. The bi-functional catalyst has efficient oxygen reduction performance and efficient oxygen evolution performance in air.

The invention relates to a zinc ferrite-loaded carbon nano tube catalyst prepared by a microwave-hydrothermal method and an application of the catalyst in degrading organic pollutants in water. A preparation method of the catalyst comprises the steps of dissolving FeCl3 and ZnCl2 into deionized water, adding a pretreated carbon nano tube into a solution, performing ultrasonic treatment for 1.0-3.0min, adjusting the pH to 7.5-11.5, stirring and transferring into a polytetrafluoroethylene reaction tank, putting the reaction tank into a microwave digester, performing hydrothermal reaction under the pressure of 0.3-1.5MPa for 10-40min, washing a product obtained by the reaction with the deionized water until the product is neutral, filtering the product, drying the product under the constant temperature of 70 DEG C, grinding the product, and screening the product with a screen of 100 meshes to obtain the zinc ferrite-loaded carbon nano tube catalyst. The catalyst provided by the invention is combined with microwaves to degrade the organic pollutants in water; the catalyst preparation speed is high, the degrading efficiency is high, the rate is high, and the cost is low; no intermediate product or secondary pollution is generated.

The invention relates to a furfural catalytic hydrogenation technology and aims to provide preparation of a platinum/carbon nanotube catalyst and an application of the catalyst to furfural catalytic hydrogenation. The preparation process for the catalyst comprises: performing ultrasonic and heating stirring reflux treatment on a carbon nanotube in concentrated nitric acid at the room temperature, cooling, taking out, soaking, washing and performing suction filtration until filter liquor is neutral; then drying for later use; adding a treated carbon nanotube carrier into a chloroplatinic acid dilute solution, and performing same-volume dipping and standing at the room temperature; removing the moisture by distillation under magnetic stirring and warm water bath conditions, and drying; and before use, performing high-temperature reduction on a catalyst in a nitrogen-hydrogen mixed atmosphere to obtain the platinum/carbon nanotube catalyst with the platinum loading capacity of 1.0 wt%. The method is simple in process, convenient to operate and low in energy consumption, no heating is required in a reaction, and the pressure of used hydrogen is relatively low. Furfural can be hydrogenated under the room-temperature condition, so that the conversion rate and the selectivity are relatively high. The catalyst still can keep high activity after being used for multiple times, so that carbon deposition is basically not caused.

The invention relates to a core-shell structured supported carbon nanotube catalyst and a preparation method thereof. The catalyst adopts carbon nanotubes (CNTs) as a carrier and adopts borazane as a reducing agent. The preparation method comprises the following steps: reducing precursors comprising a ruthenium salt, a cobalt salt and a nickel salt, loading the reduced precursors on the CNTs, filtering the above obtained product, washing the filtered product, and drying the washed product to obtain the core-shell structured Ru@CoNi/CNTs nanocatalyst. The average particle size of metals supported on the core-shell structured Ru@CoNi/CNTs nanocatalyst synthesized through the preparation method is 1.5 nm, the catalyst has high catalysis activity on hydrolysis of borazane for releasing hydrogen, the transformation frequency (TOF) is 408.9 H2 min<-1> (mol Ru)<-1>, and the activation energy (Ea) is 23.53 kJ mol<-1>. The catalyst still has good stability after 5 cycle test, the average particle size of metal particles is 1.64 nm, and the metal particles are uniformly dispersed. The noble metal/non-noble metal doped core-shell structured supported nanocatalyst adopting the CNTs as the carrier has the characteristics of uniform metal particle distribution, many catalysis activity sites and good stability; and compared with traditional noble metal catalysts, the nanocatalyst has the advantages of low cost, simplicity in preparation, easy obtaining of the raw materials, and suitableness for industrial production.

The invention discloses a palladium/carbon nanotube catalyst for the hydrogenation of cinnamaldehyde and a preparation method thereof. The carrier of the catalyst is carbon nanotubes, and the active ingredient of the catalyst is noble metal palladium nanoparticles with an average particle size of 5 to 6 nanometers. The catalyst contains 0.1 to 5 mass percent of palladium and the balance of the carbon nanotubes. The preparation method of the catalyst comprises: 1) dissolving a palladium salt in deionized water to prepare 0.01 to 0.2 mol/L aqueous solution of the palladium salt, adding the carbon nanotubes into the aqueous solution of the palladium salt and subjecting the solution to ultrasonic dispersion for 0.5 to 1 hour; 2) with magnetic stirring, dripping reducer-containing aqueous solution till the ratio of the reducer and the palladium is 1:1 to 2:1, and continuously stirring for 1 to 2 hours after the dripping is finished; and 3) finally, stirring the solution in an oil bath for 1 to 2 hours, and obtaining the palladium/carbon nanotube catalyst by filtering, washing and drying. Compared with active carbon supported palladium catalyst, the palladium/carbon nanotube catalyst has high selectivity for the preparation of benzenepropana by the hydrogenation of cinnamaldehyde.

The invention relates to a preparation method for a cadmium sulfide quantum dot/carbon nanotube photocatalyst taking polyvinylpyrrolidone as a dispersant. The preparation method comprises: pre-treatment of a carbon nanotube and preparation of a cadmium sulfide quantum dot/carbon nanotube composite photocatalyst . The preparation method provided by the invention has the benefits that the preparation method is relatively simple, the preparation conditions are easy to control, and the prepared cadmium sulfide quantum dot/carbon nanotube photocatalyst is a green and environmental-friendly high-performance catalyst which is free of pollution and high in catalytic efficiency, and has certain application value.

The invention discloses a maskless direct alcohol fuel cell and a preparation method thereof. The main content disclosed by the invention comprises the steps of (1) firstly, restoring palladium chloride and nickel chloride by sodium borohydride reductant by adjusting the pH value of mixed solution of the palladium chloride, the nickel chloride and a multi-wall carbon nano tube, preparing PdNi nano-catalyst particles (PdNi/MWCNT) loaded by the multi-wall carbon nano tube; (2) taking ethanol as a solvent, preparing AgCo catalyst particles (AgCo/MWCNT) loaded by the multi-wall carbon nano tube by a hydrothermal method; (3) preparing an anode sheet from the PdNi/MWCNT particles, and preparing the gas diffusion electrode from the AgCo/MWCNT particles, and (4) forming the maskless direct alcohol fuel cell by the anode and the gas diffusion electrode, wherein the electrolyte is sodium hydroxide solution containing alcohol. The maskless direct alcohol fuel cell disclosed by the invention adopts non-platinum metal (palladium-nickel or silver-cobalt) as an electrode material, and is strong in electrocatalytic activity, and stable in performance; the ion exchange membrane is not used, and the battery cost is greatly reduced.

The invention discloses a high-performance oxygen reduction MnO2-Mn3O4/carbon nanotube composite catalyst and a preparation and an application thereof. The composite catalyst is prepared by embedding MnO2 nanorods and Mn3O4 nanoparticles into meshes of a carbon nanotube network and/or depositing the MnO2 nanorods and the Mn3O4 nanoparticles on the surface of a carbon nanotube. The preparation method comprises the steps of: dissolving or dispersing potassium permanganate, ammonium chloride and oxidized carbon nanotube into water for hydrothermal reaction; and carrying out cooling, suction filtration, washing and drying on the hydrothermal reaction product to obtain the high-performance oxygen reduction MnO2-Mn3O4/carbon nanotube composite catalyst. The preparation method is simple and beneficial to industrial production; and the prepared MnO2-Mn3O4/carbon nanotube composite catalyst is applied to a fuel cell, has the characteristics of high activity and good stability, has approximate overall performance in comparison with a 20wt%Pt/C commercial catalyst and has a good application prospect.

The invention discloses a manganese dioxide-carbon nano tube composite catalyst based on a palladium single-atom. In the catalyst, manganese dioxide and carbon nano tubes mutually wind to form a three-dimensional nanometer structure, and palladium is loaded onto surfaces of the manganese dioxide and the carbon nano tubes in a form of single atoms. The invention also discloses a preparation methodof the catalyst, and application of the catalyst in a metal-air battery capable of being charged and discharged. According to the manganese dioxide-carbon nano tube composite catalyst based on the palladium single-atom provided by the invention, MnO2 is adopted as a base material, appropriate amount of carbon nano tubes are added, the two materials mutually wind to form the three-dimensional nanometer structure, and the loaded palladium single atom is loaded onto the manganese dioxide and the carbon nano tubes, so that the electric conductivity, the catalytic activity and the stability are improved.

The invention provides a carbon nanotube supported catalyst and a preparation method thereof as well as application of the carbon nanotube supported catalyst in low-temperature catalytic oxidation ofCO. The method comprises the following steps: mixing carbon nanotubes with impregnation liquid containing copper salt and manganese salt to obtain a mixture; drying the mixture and then roasting the mixture to obtain the carbon nanotube supported catalyst. The catalyst takes the carbon nanotubes as a carrier, and takes copper manganese complex oxide as an active ingredient supported on the carrier. The experimental results show that the catalyst prepared by the embodiment of the invention keeps relatively-high catalytic activity and stability for 0.1 to 0.5 percent of CO under the condition that the low temperature is 0 to 22 DEG C, is suitable for eliminating CO by low-temperature catalysis in a typical enclosed space and also can be used for a toxin filtering agent material of respiratory protective equipment for emergency rescue in the enclosed space. Besides, the preparation method of the carbon nanotube supported catalyst, provided by the invention, is simple; active ingredients are low in content, and the cost is relatively low.

The invention relates to the technical field of nanometer materials, in particular to a Co-N-C/carbon nano tube catalyst, a preparation method and application thereof. The method for preparing the Co-N-C/carbon nano tube catalyst comprises the following steps: S1, dispersing cobalt chloride and organic amine into absolute ethyl alcohol, and obtaining mixed powder after ultrasonic, drying and grinding treatment; and S2, carrying out calcinations on the mixed powder obtained in S1 in an inert gas atmosphere, and then carrying out acid treatment after the calcinations so as to obtain a Co-N-C/carbon nano tube. According to the method, the mixture of nickel chloride and organic amine is pyrolyzed through simple high-temperature pyrolysis creatively, namely the Co-N-C/carbon nano tube catalystis prepared and obtained, and a carbon material does not need to be used as a precursor, so that the cost is greatly reduced. Moreover, the performance of the carbon nano tube in the prepared and obtained Co-N-C/carbon nano tube catalyst is good.

The invention relates to the technical field of carbon nano tube composite catalyst grafting, in particular to a chemical grafting method for preparing an amidogen cobalt-phthalocyanine/carbon nano tube composite catalyst. The chemical grafting method comprises the four steps of 1,8,15,22-tetranitro cobalt-phthalocyanine preparation, 1,8,15,22-four-amidogen cobalt-phthalocyanine preparation, carbon nano tube pretreatment and composite catalyst preparation. According to the technical scheme, the amidogen cobalt-phthalocyanine/carbon nano tube composite catalyst is prepared, selected raw materials are wide in source, the preparation method is simple, aftertreatment is easy, and industrial production is facilitated.

The invention relates to a composite metal nitrogen-doped carbon nanotube catalyst which has the chemical structural formula of M-CNX, wherein M is one of sodium ion, potassium ion, magnesium ion or calcium ion. A preparation method of the composite metal nitrogen-doped carbon nanotube catalyst comprises the following steps of: preparing a composite metal nitrogen-doped carbon nanotube by Ar/organic amine mixed gas in the presence of a Fe/SBA-15 molecular sieve catalyst; and then, immersing the composite metal nitrogen-doped carbon nanotube into different metallic compound solutions, thus obtaining the composite metal nitrogen-doped carbon nanotube catalyst. A method for preparing biodiesel by the catalyst comprises the following steps of: mixing methyl alcohol and a cosolvent, and adding the composite metal nitrogen-doped carbon nanotube catalyst into the mixture; then, reacting the obtained mixture for 20-40 minutes at the temperature of 30-120 DEG C, and standing still for layering; washing a supernatant substance to be neutral; and finally drying and filtering, thus obtaining the biodiesel.

The invention relates to an in-situ preparation method of a zinc phthalocyanine/carbon nanotube composite catalyst based on a solvothermal method. The in-situ preparation method comprises the steps of pretreating a carbon nanotube: adding concentrated nitric acid to the carbon nanotube, flowing back, heating, mixing, cooling, washing with water to be neutral, performing suction filtration, and drying; preparing the zinc phthalocyanine/carbon nanotube composite catalyst: adding the carbon nanotube, phthalonitrile, octan zinecnaty, 1,8-diazabicyclo [5,4,0] hendecane-7-alkene and the carbon nanotube to a beaker, adding a solvent, mixing for 30 minutes, and then pouring into a reaction still for solvothermal reaction. The in-situ preparation method has the beneficial effects that the used solvent is low in price and is easy to obtain, and no environmental pollution is generated; the preparation method of the zinc phthalocyanine/carbon nanotube is simple, the reaction time is short, the aftertreatment is easy, and industrial production is facilitated; effective degradation of pollutants malachite green is realized, and the photocatalytic activity is obviously better than that of pure zinc phthalocyanine particles.

The invention discloses a method for preparing an Au-cluster/carbon nanotube composite catalyst. The method has the advantages that (1) the prepared Au/CNT composite catalyst has high onset potential, cycling stability and durability, and greatly improves catalytic activity of cathodic reaction of fuel cells; (2) the catalyst is prepared through in-situ reduction of a multiwalled carbon nanotube and chloroauric acid, the preparation method is simple and direct under mild reaction conditions with no high temperature and high pressure required, thus the synthetic process is greatly simplified and production cost is decreased; and (3) according to the preparation process, water serves as solvent instead of poisonous harmful organic solvent, at the meantime the preparation process is conducted under room temperature, which is energy-saving and environmentally-friendly and highly fits to the idea of green development and the development requirement on new energies of the modern society, thus the Au-cluster/carbon nanotube composite catalyst has a good market prospect.

The invention relates to a palladium/carbon nanotube catalyst used for selectively supporting palladium nanoparticles in carbon nanotube chamber or outside the nanotube chamber in alpha, beta unsaturated carboxylic acid hydrogenation reaction, which takes carbon nanotube as a carrier, the palladium nanoparticles can be selectively dispersed in the carbon nanotube chamber or outside the nanotube chamber, the size is uniform, and the particle size is 2-5nm. The catalyst can be used for hydrogenation and asymmetric hydrogenation of asymmetric carboxylic acid. The catalyst appears higher activity than that of the commercialized palladium catalysts in an alpha-phenylcinnamic acid hydrogenation reaction, and the highest reaction activity can reach 564mmol h<-1> g<-1>. When a chiral modification agent cinchonidine and an auxiliary agent benzylamine are added in a reaction system, the enantiomer selectivity of alpha-phenylcinnamic acid asymmetric hydrogenation product can reach more than 75%, the activity is increased to 133mmol h<-1> g<-1>, which is the highest intrinsic reaction activity of a heterogeneous catalyst to the asymmetric hydrogenation reaction of alpha-phenylcinnamic acid.

The invention discloses a preparation method of a palladium-based polyaniline coated carbon nanotube nano catalyst, wherein the preparation method mainly includes the following steps: purification ofa carbon nanotube (CNT); preparation of a polyaniline (PANI) coated carbon nanotube (PANI@CNT); and preparation of the Pd/PANI@CNT catalyst. The polyaniline coated carbon nanotube is used, and Pd nanoparticles are loaded on the surface of the PANI@CNT; the formed nano catalyst Pd/PANI@CNT has a quite good reuse performance in a Heck reaction; after reaction is carried out for 10 times, the activity is not reduced. In the prepared Pd/PANI@CNT, a large number of nitrogen-containing functional groups form coordination bonds with Pd, the bonds are quite stable and effectively inhibit the loss andagglomeration of Pd nanoparticles, and thus the cost of the catalyst is effectively reduced. In addition, the catalyst can be effectively recovered and separated, and the contamination and repurification process of the product is prevented.

The invention belongs to the technical field of chemical engineering, and particularly relates to a catalyst for preparing higher olefins through carbon dioxide hydrogenation and a preparation methodand application thereof. The catalyst disclosed by the invention is formed by taking a sawtooth metal type single-walled carbon nanotube bundle as a carrier and loading iron and potassium active components. In the catalyst, the mass of the iron accounts for 8-30% of the total mass of the catalyst, and the mass of the potassium accounts for 0.2-5.0% of the total mass of metal. The catalyst is usedfor a carbon dioxide hydrogenation reaction, the catalyst can directly and efficiently convert carbon dioxide into high-value olefins, the selectivity reaches 62% or above, and higher olefins accountfor 60% or above. The olefin selectivity of the catalyst is higher than that of a multi-walled carbon nanotube supported catalyst, the catalytic activity is high, carbon dioxide can be hydrogenated togenerate higher olefins at the speed which is three times higher than that of an existing catalyst, and the catalyst has good environmental protection significance and industrial application prospects.

A carbon nanotube filter, a use for a carbon nanotube filter and a method of forming a carbon nanotube filter. The method including (a) providing a carbon source and a carbon nanotube catalyst; (b) growing carbon nanotubes by reacting the carbon source with the nanotube catalyst; (c) forming chemically active carbon nanotubes by forming a chemically active layer on the carbon nanotubes or forming chemically reactive groups on sidewalls of the carbon nanotubes; and (d) placing the chemically active nanotubes in a filter housing.

The invention relates to a method of preparing n-tetradecane or n-hexadecane from natural acid. According to the invention, the natural acid and a solvent are mixed and then undergo a hydrogenation reaction in the presence of a catalyst and hydrogen, wherein the catalyst is a palladium/carbon nanotube catalyst, reaction pressure of the hydrogenation reaction is 1 to 10 MPa, reaction temperature is 220 to 320 DEG C, reaction time is 3 to 10 h, the catalyst uses a multi-walled carbon nanotube as a carrier and 2 to 10% by mass of palladium as an active component, and the solvent is one selected from the group consisting of hexane, n-heptane, n-octane and dodecane. Compared with the prior art, the method provided by the invention has the advantages of simple preparation technology, a low reaction temperature, a small usage amount of the solvent, high reaction activity and high yield of a target product.

The invention discloses a modifying method of a carbon nanotube catalyst. The modifying method includes following steps: 1), putting carbon nanotubes into a quartz boat, and putting the quartz boat into a discharging area of a high-voltage electrode and a grounding electrode of plasma treatment equipment; 2), filling initiating gas into the plasma treatment equipment, applying voltage between thetwo electrodes, adjusting pressure intensity of a plasma device, discharging, and treating for 1-30min to obtain a modified carbon nanotube catalyst. Interaction of high-energy active species of plasma and the carbon nanotubes is utilized to increase C=O functional groups with catalytic activity on the surfaces, the problem that conventional wet-process chemical modifying methods are harsh in process condition and long in period and cause environment pollution is avoided, and the operation process is simple and controllable; the catalyst is high in propane conversion rate and propane selectivity and presents excellent catalytic activity when being used in propane dehydrogenation reaction.

The invention relates to a photocatalyst, in particular to a preparation method of a PTH-doped Mo-Ti-carbon nanotube photocatalyst, which comprises the following steps: uniformly mixing methanol, dimethyl sulfoxide and N-methyl pyrrolidone to prepare a microemulsion; adding polythiophene into the microemulsion mixed system under a constant temperature condition, conducting dissolving and heating,adding MoO3, carbon nanotubes and TiO2, dropwise adding an ammonia water solution, conducting uniform stirring, and carrying out ultrasonic treatment for 15-25 min; carrying out hydrothermal reactionon the mixed solution at 120-250 DEG C for 12-70 hours; filtering the product, conducting washing, soaking the washed product in isopropanol after washing is finished, and finally drying the product at 50-70 DEG C for 3-5 hours to obtain the PTH-doped Mo-Ti-carbon nanotube photocatalyst. The PTH-doped Mo-Ti-carbon nanotube photocatalyst prepared by the preparation method disclosed by the inventionis high in light utilization rate, high in photoelectric conversion efficiency, long in cycle service life and good in mechanical property.