1172results about "Catalyst carriers" patented technology

The invention belongs to the field of catalysts, and particularly relates to an alumina carrier as well as a preparation method and application thereof. The surface of the alumina carrier has oxygen-containing groups, and the density of the oxygen-containing groups on the surface of the alumina carrier is 0.15-5mmol / m < 2 >. Wherein the oxygen-containing group is at least one of hydroxyl, carboxyl and lactone group; the specific surface area of the alumina carrier is 10-150m < 2 > / g. The types, the number and the density of oxygen-containing groups on the surface of the obtained carrier are improved, and various index requirements of various supported catalysts on dispersion forms and dispersion degrees of different metal active components in the field of petrochemical engineering can be well met; and the carrier also has the characteristics of low bulk density, high water absorption rate, large pore volume and large average pore size, has a gain effect on uniform distribution of active metal components in the catalyst loading process, and has extremely high application value.

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 preparation method of a small-size defective cerium-based MOFs supported metal catalyst for hydrogenation, and belongs to a preparation technology of a nano composite catalytic material. The preparation method comprises the following steps: in a cerium-based MOFs synthesis process, introducing a proper amount of monocarboxylic acid as a regulator to synthesize a cerium-based MOFs carrier with adjustable defects and size, then loading a metal active component to the cerium-based MOFs carrier, and combining adjustment of reduction conditions to prepare the cerium-based MOFs loaded metal composite catalyst with small-size defects for DCPD hydrogenation. The defects and the size of the cerium-based MOFs carrier are effectively regulated and controlled through the monocarboxylic acid regulator, controllable regulation of the electronic state, the size and the catalytic activity of the loaded metal active component can be achieved by combining regulation and control of the reduction condition of the loaded metal nanoparticle active component, the process is simple, parameters are controllable, the period is short, and the method is suitable for DCPD hydrogenation large-scale production.

The invention relates to a preparation method of silica gel microspheres used as a catalyst carrier, which comprises the following steps of: adjusting the speed of converting acidified water glass into gel by means of controlling material temperature and material concentration, multiple times of acidification and the like, so that the acidified water glass is atomized to form liquid drops, and then the liquid drops are quickly converted into the gel; and carrying out aging, acid washing, water washing, supercritical carbon dioxide drying, roasting in an atmosphere furnace and the like to prepare the silica gel microspheres with high specific surface area and large pore volume. Compared with the prior art, the specific surface area of the obtained silica gel can reach 250-450 m < 2 > / g, the pore volume can reach 1.5-3.0 cm < 3 > / g, and the silica gel has good strength and fluidity.

The invention relates to the technical field of catalysts, in particular to a carbon monoxide oxidation catalyst and a preparation method thereof. The catalyst is prepared by the method. The method comprises the following steps: adding a required amount of platinum salt and assistant salt into water for dissolving to obtain a mixed solution; dropwise adding the mixed solution into a required amount of tungsten-titanium powder, and stirring while dropwise adding until a muddy substance is obtained; adding a binder into the mud, uniformly stirring and mixing, and extruding to obtain an integral honeycomb mud blank; sequentially carrying out first drying treatment and first roasting treatment on the integral honeycomb mud blank to obtain an integral honeycomb carrier; placing the integral honeycomb carrier in a tetrabutyl titanate alcoholic solution for soaking treatment; and sequentially carrying out second drying treatment and second roasting treatment on the soaked integral honeycomb carrier to obtain the carbon monoxide oxidation catalyst. According to the invention, the carbon monoxide oxidation catalyst with high catalytic activity, strong toxicity resistance and good stability can be prepared.

The invention relates to an iron-based catalyst for catalyzing CO2 hydrogenation to prepare low-carbon olefin and a preparation method thereof, and the preparation method comprises the following steps: preparing a zirconium oxide carrier, grinding ZrOCl2. 8H2O, calcining in a muffle furnace to obtain ZrO2, and grinding to obtain the zirconium oxide carrier; the preparation method comprises the following steps: respectively dissolving a Fe source, a Co source and a K source in water, adding the zirconia carrier, stirring and evaporating to obtain a suspension, drying the suspension, and calcining to obtain a FeCoK / ZrO2 catalyst; wherein in the FeCoK / ZrO2 catalyst, the loading capacity of Fe-Co is 12.2 wt%, the molar ratio of Co / (Fe + Co) is 0.15 to 2, and the molar ratio of K to Fe is 0.2 to 0.7. The FeCoK / ZrO2 catalyst prepared by the preparation method disclosed by the invention has a very high conversion rate on CO2 and selectivity on low-carbon olefins, optimizes the adsorption activation path on CO2, and has very good catalytic activity.

The invention belongs to the technical field of chemical engineering, and particularly relates to a catalyst for sulfuric acid production. The samarium element is doped in the vanadium catalyst, so that the oxygen adsorption capacity of the vanadium catalyst is effectively improved, and the catalytic activity and low-temperature activity of the vanadium catalyst are improved; the modified diatomite and the mesoporous material are selected to jointly form the carrier, so that the dispersity of the active component on the catalyst can be improved, and the catalytic activity of the catalyst can be improved; diatomite is modified by adopting a dilute sulfuric acid solution under an ultrasonic condition, so that the specific surface area of the diatomite is increased, and the catalytic activity of the vanadium catalyst is improved; the vanadium catalyst is prepared by adopting an impregnation method, so that the problem of non-uniform dispersion of active components caused by a mixing and grinding method is effectively avoided, and the catalytic activity of the catalyst is further improved.

The invention provides a Claus tail gas hydrogenation catalyst as well as a preparation method and application thereof, and belongs to the technical field of sulfur recovery, the Claus tail gas hydrogenation catalyst comprises an aluminum-titanium-silicon-based composite carrier and active components, the aluminum-titanium-silicon-based composite carrier comprises Al2O3, nano TiO2 and SiO2, the aluminum-titanium-silicon-based composite carrier further comprises an antioxidant, and the active components comprise an active component and an antioxidant. Preparing an aluminum-titanium-silicon-based composite carrier by adopting a mixing and kneading mode; wherein the active components comprise oxides of VIII group metals, oxides of VIB group metals and oxides of rare earth metals, the rare earth metals are mixed and kneaded in the form of oxides and added into the composite carrier, and cobalt and molybdenum are loaded on the carrier by a dipping method. The catalyst has the characteristics of high low-temperature activity and strong oxidation resistance, has the function of catalyzing CO conversion, is suitable for being widely applied to hydrogenation reactors of sulfur recovery devices in the industries of petroleum refining, coal chemical industry and the like, and is particularly suitable for treating acid gas with relatively high CO2 content.

The invention provides modified aluminum oxide with a high hydroxyl density surface as well as a preparation method and application of the modified aluminum oxide. The isoelectric point regulator is added in the aluminum oxide preparation process, and corresponding surface treatment methods such as alkalization or acidification, irradiation and crystallization are combined, so that the hydroxyl group density on the surface of the formed aluminum oxide carrier can be greatly improved, and the active metal in the catalyst prepared based on the catalyst has the advantages of high dispersity and small particle size; and the utilization rate of active metal atoms can be greatly improved.

The present invention belongs to the field of catalysts and relates to an α-alumina carrier and a preparation method thereof, a silver catalyst for ethylene epoxidation and an ethylene oxidation method. The α-alumina carrier has an α-A12O3 content of more than 90% by weight; a crushing strength of 80 to 350 N / particle; and a specific surface area of ​​1.5 to 3.0 m 2 / g; water absorption rate is 30-70%; pore volume is 0.30-0.75mL / g; the crystal morphology of the α-alumina carrier includes two sizes of flake crystals, wherein the size of the larger flake crystals is 1.0-8.0μm, and the size of the smaller flake crystals is less than 1μm. Compared with the prior art, the silver catalyst made of the α-alumina carrier provided by the present invention is used for the reaction of ethylene oxidation to produce ethylene oxide, while ensuring selectivity, and has the advantages of higher activity and stability.

The invention provides a large-aperture alumina carrier as well as a preparation method and application thereof. The large-aperture alumina carrier is prepared from dry materials and water, and the dry materials comprise inert fibers, aluminum hydroxide and ammonium aluminum carbonate. According to the invention, under the condition of low water-powder ratio, primary pores and secondary accumulation pores in aluminum hydroxide and ammonium aluminum carbonate are reserved to the greatest extent under high extrusion pressure in the carrier extrusion and molding process due to the enhancement effect of inert fibers; although the apertures of the primary pores, the secondary accumulation pores and the macropores generated by decomposition of the ammonium aluminum carbonate are reduced during roasting of the carrier, the volume ratio of the pores with the pore size of more than 500nm in the final carrier is still obviously increased due to the existence of the inert fibers, and the volume ratio of the pores with the pore size of more than 500nm is 15-25%. In addition, the by-product ammonium aluminum carbonate generated in the recovery process of the waste ethylene oxide catalyst is used as the raw material and the macroporous pore-enlarging agent, so that the production cost of the large-aperture alumina carrier is reduced. The prepared large-aperture alumina carrier can be used for preparing a residual oil hydrodemetallization catalyst.

The invention discloses phenolic resin-based spherical activated carbon and a preparation method and application thereof.The preparation method comprises the steps that raw materials containing linear phenolic resin, a curing agent and an organic solvent are mixed to obtain a mixed solution, the mixed solution is dropped into a hot oil column, and thermosetting phenolic resin balls are obtained through crosslinking, curing, balling and drying; and further performing high-temperature carbonization to obtain the phenolic resin-based spherical activated carbon. The preparation method disclosed by the invention is simple and can be continuously operated. The obtained spherical activated carbon is uniform in size, and the size can be controlled and adjusted within the range of 0.5-2.5 mm.

The invention relates to the technical field of catalyst carriers, and discloses reticular porous spherical aluminum oxide as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing an aluminum source, acid, a pore-forming agent, a surfactant and water to obtain pseudo sol; (2) performing ultrasonic treatment and oil ammonia column forming treatment on the pseudo sol obtained in the step (1) to obtain gamma-Al2O3 spherical gel beads; and (3) aging, washing, drying and calcining the gamma-Al2O3 spherical gel beads obtained in the step (2) to obtain the reticular porous spherical alumina. The spherical aluminum oxide prepared by the method has abundant communicated reticular pore channels, is obviously distributed in mesopore and macropore ranges, is beneficial to obviously improving dispersion and loading of a catalyst in an aluminum oxide carrier and improving the performance of petroleum reforming and propane dehydrogenation, and has industrial production utilization value and commercial value.

The invention relates to a hollow mesoporous carbon sphere prepared based on a confinement polymerization method and a preparation method of a platinum alloy catalyst loaded by the hollow mesoporous carbon sphere and doped with rare earth metal. The method comprises the following steps: by taking mesoporous silica as a template, introducing an initiator and a small molecular organic matter precursor into mesopores, and carrying out confinement polymerization in the mesopores to obtain a silica / polymer composite; carrying out high-temperature calcination and etching treatment on the complex to obtain hollow mesoporous carbon spheres; the carbon sphere is used as a carrier to load a platinum alloy doped with rare earth metal. The hollow mesoporous carbon spheres prepared by the method have good spherical morphology and mesoporous channels and high specific surface area, and the problems of non-uniform morphology, unobvious mesopores and the like in a traditional method are solved. After platinum alloy particles doped with rare earth metal are loaded on the carbon spheres, the problems of agglomeration, wide particle size distribution, poor performance and the like of the platinum alloy particles are solved.

The invention belongs to the technical field of catalysts, and particularly relates to a palladium catalyst for anthraquinone hydrogenation and a preparation method thereof.The preparation method comprises the following steps that hexadecyl trimethyl ammonium bromide serves as a main template agent, a small amount of polyethylene glycol is added, and a catalyst carrier with the high specific surface area is prepared; impregnating the catalyst carrier with a palladium salt solution; and drying, roasting and reducing the impregnated catalyst carrier to obtain the palladium catalyst for anthraquinone hydrogenation. The palladium catalyst for anthraquinone hydrogenation takes the prepared aluminum oxide with high specific surface area as a carrier, so that the catalytic efficiency is greatly improved. On one hand, the large aperture of the catalyst carrier can reduce diffusion resistance and is beneficial to transmission of reaction materials; and on the other hand, anthrahydroquinone generated by the reaction is more easily diffused from a larger hole, so that reduction of catalytic activity due to overlong retention time of anthrahydroquinone in the hole channel is avoided. Meanwhile, the large specific surface area of the catalyst carrier can enable the active components to be better dispersed, so that the hydrogenation efficiency is remarkably improved.

The invention is suitable for the technical field of photocatalyst preparation, and provides a modified tubular g-C3N4 loaded Ni-CoP photocatalyst and a preparation method thereof. The preparation method comprises the following steps: calcining a carbon nitride precursor in stages to obtain tubular carbon nitride, stirring the tubular carbon nitride with a cobalt and nickel-containing compound and an alkaline compound, washing and drying to obtain a precipitate, calcining, mixing and grinding with a phosphorus-containing compound, calcining again, and modifying the product with polydopamine and polypyrrole to obtain the composite material. The photocatalyst modified by the polydopamine and the polypyrrole and loaded with the Ni-CoP by taking the tubular g-C3N4 as the carrier is obtained. According to the invention, three-in-one synergistic integration of'carrier-modifier-cocatalyst 'is realized, the prepared photocatalyst still keeps tubular morphology and has a larger specific surface area, the requirements of anode oxygen evolution reaction (OER) on rapid charge separation and transmission can be met, meanwhile, the light absorption range is widened, the solar energy utilization rate is increased, and a foundation is laid for efficient OER reaction.

The invention discloses stable silicon dioxide microspheres as well as a preparation method and application thereof. Mixing a sodium silicate diluent and an organic acid aqueous solution to form colloidal particles, and carrying out a sol-gel reaction to obtain silica sol; the preparation method comprises the following steps: in an air environment, throwing silica sol into water under stirring to form microspheres, injecting inorganic acid into the water at the same time, then injecting a sodium silicate diluent for reaction, and then adjusting the pH value of the system to 6-7; and aging, washing, drying and roasting to obtain the silicon dioxide microspheres. The preparation method comprises the following steps: mixing a sodium silicate diluent and an organic acid aqueous solution by an acid mixing method, granulating by air to form microspheres, and finally injecting inorganic acid to quickly remove heat, reduce pressure drop and maintain the state of the microspheres, thereby obtaining the stable silicon dioxide microspheres. The porous silicon dioxide microsphere with larger surface area and pore volume is obtained, has better catalytic performance when being used as a catalytic oxidation carrier, and has the advantages of high conversion rate and high stability.

The invention relates to the technical field of high polymer materials, and discloses a preparation method and application of polystyrene-divinyl benzene composite microspheres, and an environment-friendly solvent system, such as a water-based or non-toxic organic solvent, is adopted to replace a traditional organic solvent. The solvent pollution risk can be reduced by using water-phase emulsion polymerization, meanwhile, the recovery and treatment of the solvent are simplified, the surfactant is optimized, the low-toxicity and environment-friendly surfactant is selected for emulsion stabilization, and chemical substances harmful to the environment and the human body are prevented from being used. By optimizing a polymerization process, accurately controlling the crosslinking degree and introducing a green solvent and an environment-friendly surface modification method, the improved polystyrene-divinyl benzene composite microsphere overcomes some defects (such as high cost, non-uniform particle size, difficulty in controlling the crosslinking degree and the like) in the prior art; in addition, the method has wider application potential in a plurality of fields (such as coatings, medicines and catalysis), and has better environmental protection property, health safety and the like.

The invention provides a self-supporting carbon-based material loaded with iron nanoparticles as well as a preparation method and application of the self-supporting carbon-based material, and belongs to the technical field of preparation and application of an electrocatalyst for removing nitrate in sewage. The preparation method of the self-supporting carbon-based material loaded with the iron nanoparticles comprises the following steps: providing a carbon felt subjected to acid pickling and water bath heating; the method comprises the following steps: mixing an iron precursor and urea in a solvent to obtain a mixed solution containing iron salt; and mixing the carbon felt with the mixed solution containing the iron salt, and carrying out a hydrothermal reaction to obtain the self-supporting carbon-based material loaded with the iron nanoparticles. When the iron nanoparticle-loaded self-supporting carbon-based material provided by the invention is used as a cathode for electro-catalysis of nitrate-containing wastewater, a good removal rate and ammonia nitrogen selectivity are achieved, and the catalyst can keep relatively high nitrate nitrogen removal and ammonia nitrogen production effects under the conditions of acidity, neutrality, alkalinity and different initial nitrate concentrations; the method has the advantages of high removal efficiency, good ammonia nitrogen selectivity, strong stability and the like.

The present invention discloses a layered metal hydroxide composite catalytic material, its preparation method and application. The composite catalytic material comprises a carrier carbon nanotube and a metal hydroxide loaded on the carbon nanotube, and the metal is iron, cobalt and nickel. Preparation method: (1) Dissolve nickel salt, cobalt salt, iron salt and urea in an alcohol solution, stir evenly, then add carbon nanotubes, and continue to stir evenly to obtain a mixed solution; (2) Carry out a solvothermal synthesis reaction on the mixed solution obtained in step (1), filter, wash and dry after the reaction is completed to obtain the layered metal hydroxide composite catalytic material. The carbon nanotubes are introduced into the layered metal hydroxide in this composite catalytic material, reducing the precipitation of metal ions, avoiding the aggregation of hydroxides, improving the stability and catalytic activity of the catalytic material, and being used for activating persulfate to degrade organic pollutants, realizing the efficient activation of persulfate so as to improve the degradation rate of pollutants.

The invention discloses a wear-resistant attapulgite honeycomb material with a self-cleaning function as well as a preparation method and application thereof, and belongs to the technical field of atmospheric pollution control and environment-friendly materials. The problems that in the prior art, a titanium-based denitration carrier is high in abrasion rate and serious in dust deposition in high-dust flue gas are solved. The preparation method comprises the following steps: firstly, adding attapulgite powder into an acid solution, continuously stirring, filtering, cleaning and drying to obtain pretreated attapulgite powder; dissolving a metal salt and a modifier in an ethanol solution, uniformly mixing, carrying out ball milling on the obtained mixed solution and the pretreated attapulgite powder, and carrying out heat preservation to obtain secondarily modified attapulgite powder; and finally, pugging a structure aid, a forming aid, an extrusion aid, a binder and the secondarily modified attapulgite powder, carrying out extrusion forming on the obtained pug, drying, and calcining to obtain the attapulgite honeycomb material. The attapulgite honeycomb material has the advantages of low cost, high mechanical strength and dust suppression performance, and can be used as a carrier of a denitration catalyst.

The invention discloses an alumina-loaded molecular alkane dehydrogenation catalyst and a preparation method and application thereof. The preparation method comprises the following steps: (1) carrying out modification treatment on alumina balls; and (2) adding the modified alumina balls into a dissolved solution of a molecular catalyst, stirring, reacting until the supernatant is colorless, filtering, and drying to obtain the alumina-loaded molecular alkane dehydrogenation catalyst. The catalyst provided by the invention is used in a process for preparing olefin through dehydrogenation of straight-chain alkane, the alkane conversion rate can reach 21% or above, the catalyst is high in catalytic efficiency, good in selectivity and easy to recover, and the activity of the recovered catalyst is still high.

The invention provides a preparation method of a corrugated plate type flue gas comprehensive treatment catalyst, which comprises the following steps: impregnating glass fiber paper in a forming liquid, drying to obtain glass fiber flat paper, pressing the glass fiber flat paper into glass fiber corrugated paper, and alternately stacking and bonding the glass fiber flat paper and the glass fiber corrugated paper to obtain a forming framework; dipping the prepared forming framework in carrier slurry, and then drying and calcining to obtain a carrier; impregnating the prepared carrier in a first functional component impregnation liquid, and then performing suction filtration and calcination to obtain a catalyst precursor; and impregnating the prepared catalyst precursor in a second functional component impregnation liquid, reducing and drying to obtain a catalyst finished product, wherein the second functional component impregnation liquid comprises a noble metal precursor. By improving the corrugated plate structure of the catalyst and the formula of the active components, the prepared catalyst has the advantages of high reaction airspeed, high catalytic activity, good stability and the like, and has the advantages of simple preparation process and easiness in operation.

The invention discloses a preparation method of a carbon shell confinement type nickel-bismuth-titanium composite catalyst and application of the carbon shell confinement type nickel-bismuth-titanium composite catalyst in high alcohol synthesis, and belongs to the technical field of catalysts. The preparation method of the carbon shell confinement type nickel-bismuth-titanium composite catalyst comprises the following steps: dissolving nickel salt, titanium dioxide and citric acid in water to form a homogeneous solution; adding bismuth salt into the homogeneous solution, and drying to obtain a precursor; and roasting the precursor to obtain the carbon shell confinement type nickel bismuth titanium composite catalyst. The carbon shell confinement type nickel-bismuth-titanium composite catalyst provided by the invention shows excellent catalytic performance in a reaction system for synthesizing high-carbon alcohol through carbon-carbon coupling of water-phase alcohol molecules. According to the catalyst, the high-carbon alcohol yield can reach 45.04% while high organic phase selectivity is maintained, and compared with a traditional nickel-bismuth-based catalyst, the high-carbon alcohol yield is remarkably improved.

The invention relates to the technical field of activated carbon regeneration preparation, in particular to a denitration and desulfurization activated carbon catalyst preparation control method and system.The method comprises the steps that activated carbon is added into prepared steeping liquor, and the metal ion concentration in the steeping liquor and the steeping liquor microcirculation flow rate in the loading process are collected in real time based on a preset time interval; acquiring a decline rate parameter Nd of metal ion concentration and a liquid flow rate change rate parameter Ls; according to the metal ion concentration decline rate parameter and the liquid flow rate change rate parameter, a load uniformity grading rule is established, and a load uniformity grading result is obtained.According to the method, the metal ion concentration decline rate and the liquid flow rate change rate are obtained, the load state of the activated carbon is evaluated based on the two kinds of dynamic parameters, and the two kinds of dynamic parameters are combined; whether an abnormal state of too fast adsorption, local saturation or mass transfer lag exists in the loading process or not can be accurately represented from two dimensions of adsorption rate and liquid phase mass transfer.

The production line comprises a preheating furnace, a tubular furnace and a cooling furnace which are connected in sequence, the preheating furnace comprises a first furnace body, a rack, a first feeding pipe, a first discharging pipe, a preheating device and a first driving mechanism, the first furnace body is rotationally connected to the rack, and the second furnace body is rotationally connected to the rack; the two ends of the first furnace body are rotationally connected with the first feeding pipe and the first discharging pipe correspondingly, a first preheating conveying blade is arranged in the first furnace body, a material guiding barrel is arranged in the first preheating conveying blade, a second preheating conveying blade is arranged on the inner side wall of the material guiding barrel, and the preheating device and the first driving mechanism are installed on the rack. The preheating device preheats the first furnace body, and the first driving mechanism drives the first furnace body to rotate. Compared with the prior art, the catalyst carrier has the advantages that preheating and drying can be performed during preparation of the activated carbon, carbonization and activation effects are improved, carbonization and activation processes in the production process of the activated carbon can be effectively controlled, and the catalyst carrier with large aperture and high specific gravity is obtained.

The invention provides a multi-metal supported catalyst as well as a preparation method and application thereof. The multi-metal supported catalyst comprises a low-valence metal catalyst, a high-valence metal catalyst and a carrier, the low-valence metal catalyst is FeOCl doped with an element X, and the element X is selected from at least one of Cu, Mn and Ni; the high-valence metal catalyst is selected from at least one of MoS2 and WS2; the carrier is selected from at least one of zeolite, pelelith and activated carbon. According to the multi-metal supported catalyst provided by the invention, the low-valence metal catalyst and the high-valence metal catalyst are simultaneously supported on the carrier, so that the surface active center of the catalyst is increased, meanwhile, the circulation rate of Fe (II) / Fe (II) is increased, and the multi-metal supported catalyst has relatively high catalytic efficiency.

The invention relates to the field of porous materials, in particular to a silicon carbide regulated porous silicon carbide film material generated through in-situ reaction and a preparation method and application thereof. According to the porous silicon carbide film material blank, a framework is formed by original silicon carbide particle aggregate, a silicon-containing component and a carbon-containing component are contained in macropore gaps formed among particles, and in the sintering preparation process of the film material, the silicon-containing component and the carbon-containing component are subjected to an in-situ reaction to generate nanoscale or submicron silicon carbide crystal grains to fill the macropore gaps and form small pores. The original silicon carbide particles and / or the nano-scale or submicron-scale silicon carbide crystal grains are connected through sintering to obtain a hole-embedded hole structure. The innovation of the invention lies in that sintering among silicon carbide particles is promoted by adopting the activity of in-situ reaction, the problem that the pore structure cannot be regulated and controlled when macropores among aggregate particles in the transition layer of the silicon carbide film material are simply stacked and filled by small particles is solved, and the permeability of the silicon carbide film material is favorably improved.

The present invention relates to the technical field of heavy oil hydrodesulfurization, and discloses a hydrodesulfurization catalyst preparation process, which comprises: adding deionized water, a nickel source, a molybdenum source and a dispersant into a reaction container, stirring to obtain a metal solution, pouring into a container filled with gamma-Al2O3, impregnating, drying, and roasting to obtain the hydrodesulfurization catalyst. The dispersing agent contains a large number of nitrogen atoms and a plurality of carboxyl groups and hydroxyl groups, has very strong coordination chelation performance on nickel and molybdenum, improves the dispersity of nickel and molybdenum precursors, enables the nickel and molybdenum precursors to be uniformly impregnated into a gamma-Al2O3 carrier, and nickel oxide and molybdenum oxide are uniformly distributed in the gamma-Al2O3 carrier after calcination, so that the nickel and molybdenum oxide-modified gamma-Al2O3 composite material is prepared. The obtained hydrodesulfurization catalyst can expose more nickel-molybdenum catalytic active centers, effectively catalyzes and removes sulfur-containing substances such as thiophenes in straight-run diesel oil, shows a higher desulfurization rate, and improves the quality of oil products.

The invention relates to the technical field of catalyst preparation, and discloses a preparation method and application of a ruthenium / cerium oxide composite nanofiber catalyst, and the preparation method comprises the following steps: (1) adding cerium salt and P123 into a mixed solution of DMF (Dimethyl Formamide) and an alcohol solvent according to a molar ratio of 1: (0.1-0.4), stirring and mixing, and carrying out hydrothermal reaction at 160-180 DEG C for 4-12 hours to obtain a spinning solution; (2) performing electrostatic spinning on the spinning solution to obtain a cerium fiber precursor; (3) pre-oxidizing the cerium fiber precursor, and then carrying out aerobic roasting to obtain a cerium oxide nanofiber carrier; and (4) dipping the cerium oxide nanofiber carrier in a ruthenium salt solution, drying, and performing hydrogen reduction to obtain the catalyst. According to the invention, the ruthenium / cerium oxide composite nanofiber catalyst with a unique cavity-containing nanofiber form is prepared by adopting an electrostatic spinning technology, and the ruthenium / cerium oxide composite nanofiber catalyst has good catalytic selectivity and stability in an ammonia decomposition reaction.