155 results about "Ammoxidation" patented technology

This invention discloses a composite sponge carrier for anaerobic ammonia oxidation, its preparation method, and its application, belonging to the field of wastewater treatment technology. The composite sponge carrier comprises: a porous polyurethane sponge and a composite component loaded on the surface and internal pores of the porous polyurethane sponge; wherein the composite component includes chitosan-modified biochar as a microbial affinity functional component and zeolite powder as a component for ammonia nitrogen adsorption and ion exchange regulation. This invention introduces more active functional groups and hydrophilic interfaces conducive to microbial attachment through chitosan modification, and then co-impregnates and loads it with zeolite powder onto the surface and pores of the polyurethane sponge. This improves the composite sponge carrier's retention and enrichment capacity for anaerobic ammonia oxidizing bacteria, improves the local substrate environment during the start-up phase, promotes rapid biofilm establishment, and enhances the system's operational stability.

The present invention discloses an ammonia oxidation process and a method for recovering Rh from a gas phase comprising volatile precious metals, comprising the steps of: a) generating or providing volatile precious metals, particularly by operating a catalytic system comprising a catalyst, wherein the catalyst contains precious metals, wherein the precious metals at least comprise Rh, wherein the volatile precious metals comprise at least volatile Rh; b) contacting volatile Rh generated in step a) with a recovery system comprising a compound of formula Co3-xMxO4, where M is Fe or Al and x = 0-2; and c) forming a solid composition comprising the compound of formula Co3-xMxO4 and Rh, wherein the compound of formula Co3-xMxO4 is bonded with Rh, particularly as determined by SEM-EDS and TEM analysis. The present invention further relates to the use of the compound of formula Co3-xMxO4, where M is Fe or Al and x = 0-2, or the use of the recovery system, for recovering at least volatile Rh.

The application provides an ammonia oxidation catalyst, a preparation method and application thereof, and a method for synthesizing acrylonitrile by propylene ammonia oxidation, and the general formula of the active component of the catalyst is Mo 12 Bi a B b C c D d O x ; wherein B is selected from at least one of group VIII metal elements; C is selected from at least one of alkaline earth metal elements; D is selected from at least one of alkali metal elements; and the hollow rate of the catalyst is 0-5%. The catalyst has the advantages of good sphericity, few hollow particles, uniform particle size distribution, good fluidization state in a fluidized bed reactor, less catalyst loss after long-term operation, high acrylonitrile yield, low content of by-products two-carbon and propylene aldehyde, and better long-term operation stability.

The present application provides a catalyst for preparing acrylonitrile, which comprises a carrier and an active component, wherein the active component is a metal oxide having the general formula (I) A a B b C c Fe d Ni e Bi f Mo 12 O x (I). The present application also provides a method for preparing the catalyst for preparing acrylonitrile of the present application. The present application also provides the use of the catalyst for preparing acrylonitrile of the present application or the catalyst for preparing acrylonitrile prepared according to the method of the present application in the preparation of acrylonitrile by propylene ammoxidation. The catalyst for preparing acrylonitrile of the present application still has a high acrylonitrile yield under a high propylene load. The catalyst not only has a high acrylonitrile yield under a high propylene load, but also has a low acrolein yield, so that the acrylonitrile recovery rate of the device is high to improve the production efficiency and economic benefit of the device.

The application provides a method for synthesizing adiponitrile by selective ammoxidation of epoxycyclohexane. The purpose of the application is to simulate and optimize the process of synthesizing adiponitrile by one-step direct ammoxidation of epoxycyclohexane, and to develop a new type of multiphase composite metal vanadium-based oxide catalyst, which is composed of Co a V b P c Mo d MNOx / TiO2, the active elements of which include vanadium element V, cobalt element Co, phosphorus element P and molybdenum element Mo, M is an auxiliary metal element (Mn, Cr, Fe or Ni), N is an alkali metal (Na, K or Cs); the value range of a is 0.2-1.2; the value range of b is 0.8-1.5; the value range of c is 0.1-0.23; the value range of d is 0.07-0.35; x is the proportion of oxygen atoms required to meet the oxidation state of metal. The catalyst has the advantages of simple preparation, good cycle stability, high yield and the like. The yield and product purity of adiponitrile are improved, the energy consumption in the production process of adiponitrile is reduced, and a breakthrough is realized in the production technology of adiponitrile.

A burner basket assembly of an ammonia oxidation reactor, wherein the burner basket assembly comprises a burner basket inner side wall, a gas-permeable bottom plate, wherein between the burner basket inner side wall and the bottom plate a circumferential radial clearance is present, an L-shaped clearance cover profile which comprises a horizontal clearance cover plate and a vertical clearance cover plate which has a certain length, wherein the horizontal and the vertical clearance cover plate are mechanically fixed to each other, and wherein the L-shaped cover profile during operation is displaceable in a vertical direction in view of the burner basket inner side wall, a support ring which is mechanically fixed to the burner basket inner side wall, an upside-down positioned L-shaped locking profile, comprising a horizontal locking plate and a vertical locking plate which are mechanically fixed to each other, wherein the horizontal locking plate is mechanically fixed to the support ring, wherein the L-shaped locking profile, the support ring and the respective part of the burner basket inner side wall limit a ring-shaped gap into which at least a top part of the vertical clearance cover plate is located, and wherein between the support ring and the vertical clearance cover plate a distance is arranged which is such that the vertical displacement of the vertical clearance cover plate in view of the burner basket inner side wall is limited by the support ring and at all times during the operation of the burner basket, collision between the L-shaped clearance cover profile and the L-shaped locking profile is avoided.

The invention discloses a preparation method of a superfine PtIr nanowire catalyst for ammoxidation. The preparation method comprises the following steps: firstly, fully dissolving platinum acetylacetonate, iridium acetylacetonate, tungsten hexacarbonyl and dodecyl trimethyl ammonium bromide in oleylamine to obtain a light yellow solution; carrying out ultrasonic treatment on the obtained light yellow solution until the solution is fully dissolved; and heating the obtained uniform light yellow solution to 190 DEG C in an oil bath, keeping the temperature for 5 hours, centrifuging, washing and drying to obtain the superfine PtIr nanowire catalyst. The nanowire structure has a high specific surface area and abundant active sites, and is beneficial to effective quality and electron transmission. Through alloying of Ir and Pt, the electronic structure on the surface of the catalyst is changed, and the poisoning probability is effectively reduced. Meanwhile, the adsorption and activation process of ammonia molecules is optimized through the synergistic effect between Pt and Ir, the reaction activation energy is reduced, and the reaction rate is remarkably increased. The catalyst not only has remarkable ammonia oxidation catalytic performance, but also is good in stability and simple in preparation process.

The invention belongs to the technical field of sewage treatment, and particularly relates to a lateral flow anaerobic ammonia oxidation effluent deep nitrogen and phosphorus resource recycling method which comprises the following steps: mixing treated anaerobic sludge digestion liquid and untreated anaerobic sludge digestion liquid in an intermediate water tank to form mixed inlet water; adding a magnesium source into the mixed inlet water in the middle water tank to form a middle mixed solution; transferring the intermediate mixed solution into a short-cut denitrification-anaerobic ammonia oxidation coupled struvite reactor, adjusting the pH value of the intermediate mixed solution, and adding a carbon source into the pH-adjusted intermediate mixed solution to form a reaction solution; and carrying out solid-liquid separation on a product obtained after the reaction of the reaction liquid, and discharging the separated liquid or systematically recycling the separated liquid. According to the invention, deep nitrogen removal and phosphorus resource recovery under the condition of low carbon source can be realized, and a new way is provided for subsequent deep treatment of a short-cut nitrification-anaerobic ammonia oxidation process.

A catalytic article for treating an exhaust stream, which comprises -a substrate, -a coating layer, comprising a first catalyst containing a precious metal component and a second catalyst containing a molecular sieve component, in a first coating configuration; or -a substrate, -a first coating layer, which comprises a first catalyst containing a precious metal component, and -a second coating layer, which covers at least part of the first coating layer and comprises a second catalyst containing a molecular sieve component, in a second coating configuration; wherein the coating layer in the first coating configuration or the second coating layer in the second coating configuration has inter-particle pores at a pore ratio of 5.7% or more respectively. It also relates to a process for preparing the catalytic article by using a pore-forming agent in the slurry for depositing a coaing layer, and to a system for treating an exhaust stream comprising the catalytic article.

A device and a method for maintaining the stability of anaerobic ammonium oxidation (anammox) by using a combined zeolite filler to resist water quality fluctuations are provided. The device includes a water inlet tank, an anammox reactor, and a water outlet tank, where the anammox reactor is filled with the combined zeolite filler maintained in a state of suspension, domestic sewage enters the anammox reactor through a water inlet pump, and effluent water enters the water outlet tank through an overflow port. The device combines the physical characteristics of zeolite adsorption of ammonium with the anammox process: when the concentration of ammonium in the influent water is too high, the zeolites will temporarily store the excess ammonium adsorbed; when the concentration of nitrite in the influent water is too high, the zeolites are capable to release the stored ammonium into a liquid phase through balanced adsorption desorption.

The invention discloses a starting and control method for treating ammonia-nitrogen wastewater by an integrated complete ammoxidation coupling short-cut denitrification anaerobic ammoxidation process, and belongs to the field of wastewater biological treatment. The starting method adopts a step-by-step inoculation strategy, and comprises the following steps: firstly, inoculating complete ammoxidation sludge in the SBR reactor for low-oxygen domestication, and after successful starting, supplementing and inoculating short-cut denitrification coupled anaerobic ammoxidation sludge. The control method adopts a sectional water inlet mode, and comprises the following steps: a first part of ammonia nitrogen wastewater firstly enters an integrated SBR (Sequencing Batch Reactor), and ammonia nitrogen is directly oxidized into nitrate nitrogen through complete ammonia oxidizing bacteria (Comammox) under the condition of low dissolved oxygen; aeration is stopped, a carbon source is added for short-cut denitrification, and nitrate nitrogen is reduced into nitrite nitrogen; and then pumping a second part of ammonia nitrogen wastewater, and converting ammonia nitrogen in the wastewater and accumulated nitrite nitrogen into nitrogen by using anaerobic ammonium oxidation bacteria, so as to remove the ammonia nitrogen in the wastewater. According to the invention, deep denitrification is realized under the condition of saving energy consumption and a carbon source.

The invention relates to the technical field of wastewater treatment, and particularly provides a method for improving the anaerobic ammonia oxidation denitrification effect of high-ammonia-nitrogen wastewater. The method is realized by adding one or more enhancer combinations into a reaction system, wherein the enhancer is selected from vitamin B6, siderophore catechin (CAT) and siderophore hydroxyethyl ethylenediamine triacetic acid (HEDTA). By adding the enhancer, the inhibition effect of a high-ammonia-nitrogen environment on anaerobic ammonium oxidation functional flora can be effectively relieved, and the metabolic activity and the proliferation rate of the anaerobic ammonium oxidation flora are remarkably enhanced. The method is simple and convenient to operate and low in cost, can greatly improve the denitrification efficiency and operation stability of the system under high ammonia nitrogen load on the premise of not changing the structure of the existing reaction system, and is suitable for treating high ammonia nitrogen wastewater such as mine leaching tail water, landfill leachate and the like.

The present invention relates to a composition comprising platinum supported on titanium oxide, the platinum particles having an average particle diameter of 50-200 nm. The composition has a surprisingly low light-off temperature for the ammonia oxidation and a high selectivity for oxidation to N2.

The invention discloses a collaborative deep purification method and system for phenol-cyanamide in coking wastewater, and belongs to the technical field of industrial wastewater treatment. According to the invention, a quality-based grading and recycling coupled system is adopted, and oil-water separation and soluble tar reduction are simultaneously realized through front-stage pretreatment, so that the subsequent treatment load is effectively reduced; catalytic oxidation and ozone oxidation are synergistically enhanced in the middle section, so that favorable conditions are created for biochemical treatment; the biochemical section is used for constructing a poison-resistant flora and coupling a short-cut nitrification and denitrification or anaerobic ammonia oxidation process to realize low-carbon denitrification; at the tail end, through the synergistic effect of membrane separation and selective adsorption, the water quality of recycled water is guaranteed, and meanwhile resource recycling of ammonia nitrogen is achieved.

This invention discloses a two-dimensional layered ammonia oxidation catalyst based on MXene, its preparation method, and its application in low-temperature ammonia fuel cells. The catalyst comprises an active component and a support. The active component is one or two of the transition metals Pt, Ir, and Pd, and the support is accordion-shaped MXenes. The catalyst support prepared by this invention has a large specific surface area, in which the transition metal nanoparticles are uniformly dispersed and have strong interactions with the MXenes, which can significantly improve its ammonia electrocatalytic oxidation activity, showing good application prospects in ammonia fuel cells.

The present invention describes a method for producing precious metal meshes for ammonia oxidation. The method according to the invention allows for the robust and simple production of distortion-free meshes through a special winding process.

The embodiment of the application provides a kind of propane ammoxidation preparation acrylonitrile, it is related to acrylonitrile generation technical field;The method comprises: propane, ammonia and oxygen are mixed, and mixed gas is obtained;The mixed gas occurs ammoxidation under the action of metal oxide composite catalyst, and acrylonitrile is obtained;The metal oxide composite catalyst includes Mo-V base metal oxide, and also includes alkali metal or alkaline earth metal.The method of the present application has relatively mild reaction conditions, the yield can basically reach more than 60%, the selectivity can reach more than 80%, improves the raw material utilization rate, reduces energy consumption and equipment investment, thereby effectively reducing the production cost of acrylonitrile.At the same time, the process of the present application can effectively control the side reaction in the reaction process, reduce the generation of by-products, and reduce the difficulty of subsequent separation and purification of reaction products.

The present application relates to a kind of ammonia oxidation catalyst and its preparation method and application, the catalyst includes outer layer structure, intermediate layer structure and inner layer structure, wherein, outer layer structure includes Mo, V, Co, optional metal Bi and metal A, wherein the metal A is selected from one or more of Cs, K, Cu;Intermediate layer structure includes Mo, Cr, optional Sb, optional W and element X, wherein metal X is selected from one or more of Fe, P, Na, Mg;Inner layer structure includes Mo, Al, Si and optional element Y, element Y is selected from one or more of Sb, Sr, Ru, B, Ce.The catalyst has the characteristics of high activity, high thermal conductivity, which is applied to the reaction process of gaseous ammonia oxidation hydrocarbon or alcohol to prepare nitrile compound, and the catalyst has good stability, long service life, and high selectivity, high yield.

The application discloses a catalyst for preparing acrylonitrile through propylene ammoxidation and a preparation method and application thereof. An active component of the catalyst comprises La, Q and R, R is at least one of Ce, Pr, Nd, Sm and Eu elements, and Q is at least one of Zr, Ca, Ti and P elements; an atomic ratio of the La to the R is 0.05-0.45, and an atomic ratio of the Q / (La+R) is 0.01-0.25. When the catalyst is used for preparing acrylonitrile through propylene ammoxidation, the catalyst has the characteristics of high activity and low two-carbon yield in a long-period running process.

The utility model relates to the technical field of anaerobic ammonia oxidation reactor denitrification devices, and discloses an anaerobic ammonia oxidation reactor denitrification device which comprises a workbench and a reactor box, a stirring assembly is arranged in the reactor box, and the stirring assembly comprises a motor, a driven bevel gear, an inner gear ring and a placing frame. After wastewater containing ammonia nitrogen and nitrite nitrogen flows into a reactor box, a worker starts a motor to drive a driving bevel gear to rotate, then a driven bevel gear is driven to rotate, a rotating gear circumferentially rotates in an inner gear ring, meanwhile, the worker starts a driving piece, the driving piece enables a stirring block and a stirring blade to rotate, and the stirring block and the stirring blade rotate; ammonia nitrogen and nitrite nitrogen wastewater in the reactor box are mixed and stirred, so that the ammonia nitrogen and the nitrite nitrogen can be distributed more uniformly in the reactor box, anaerobic ammonium oxidation bacteria can be in full contact with reactants, the reaction efficiency is further improved, and sludge precipitation can be prevented.

The granular sludge ager is additionally provided with a granular sludge aging module, and the granular sludge ager comprises a sludge leading-out unit, a matrix blending unit and an aged sludge processing unit, the sludge leading-out unit is embedded into the bottom end of the interior of the vertical flow reactor; the matrix blending unit is used for guiding ammonia nitrogen and nitrite nitrogen into the vertical flow reactor to regulate and control water distribution, granulated sludge is obtained after reaction in the vertical flow reactor, and sludge with the target particle size is guided out through the sludge guiding-out unit; and the cured sludge processing unit is used for performing post-treatment on the sludge with the target particle size to obtain a cured granular sludge product. Ammonia nitrogen and nitrite nitrogen regulation and control distribution water is used as input, after the reaction of the vertical flow reactor, sludge is guided out through the sludge guide-out unit at the bottom end, and is treated through the cured sludge processing unit to form a cured granular sludge product, so that the problems of shortage and high selling price of the existing ammoxidation cured sludge are solved.

A catalyst comprises a first catalyst coating and a second catalyst coating, wherein the first catalyst coating comprises an ammonia oxidation catalyst, and wherein the second catalyst coating comprises an SCR catalyst, the SCR catalyst comprising a transition metal located on a support, wherein the molar ratio of the transition metal to Al is greater than about 0.43.

The present invention aims to provide a catalyst that exhibits excellent mechanical strength, can be used for a long period of time without damage, and shows a high raw material conversion rate even at low reaction temperatures, when a portion of ammonia is burned and the heat of combustion is used in the ammonia decomposition reaction to produce hydrogen from ammonia, and also aims to efficiently obtain the heat of ammonia combustion by using this catalyst. [Solution] An ammonia oxidation catalyst having an average crush strength Av of 5N or higher, calculated from 10 or more of the said molded catalysts.

This invention relates to the field of catalyst technology, specifically to a catalyst for the ammoxidation of m-xylene to isophthalonitrile and its preparation method. It includes a support and an active ingredient, wherein the active ingredient has the general structural formula: V 1.0 Cr a X b Y c Z d O e Wherein: X is selected from at least one of B, P, As and Se; Y is selected from at least one of Group VIII transition metals; Z is selected from at least one alkaline earth metal. The catalyst prepared by the present invention is used for the ammoxidation of m-xylene to prepare isophthalonitrile, thereby improving the selectivity and yield of isophthalonitrile.

This utility model relates to the field of industrial wastewater treatment technology, and provides a hydrolysis acidification coupled anaerobic ammonia oxidation process device, including a tank body, a support frame installed inside the tank body, a three-phase separator installed inside the support frame, a biological packing tube installed inside the support frame, the three-phase separator being fixedly connected above the biological packing tube, an outlet pipe installed on one side of the three-phase separator, an outlet weir fixedly connected to the upper surface of the three-phase separator, and an inlet / replenishment pipe fixedly connected to the outside of the support frame. In this utility model, the return spring applies a restoring force to the extrusion block, causing it to spring back and automatically lock into place below the connecting shell, thereby locking the mounting plate. This structure allows for the integrated installation of the anaerobic reactor, waterproof motor, and stirring blades during hoisting; when maintenance of the motor or stirring components is required, simply press the extrusion block to release the mounting plate, making operation simple and maintenance convenient, effectively improving the assembly efficiency and maintenance convenience of the equipment.

The invention discloses a primer for a digital ink-jet printing tank, which is prepared from the following raw materials in percentage by weight: 30 to 40 percent of acrylic modified polyester resin, 10 to 15 percent of polyurethane acrylate oligomer, 5 to 10 percent of amino resin, 5 to 10 percent of adhesion promoter, 10 to 20 percent of ethylene glycol monobutyl ether, 10 to 20 percent of N, N-dimethylformamide, 5 to 10 percent of solvent and the balance of water. The acrylic modified polyester resin is prepared from, by weight, 1%-3% of N, N-dimethylethanolamine, 0.5%-1% of oxidized polyethylene wax powder, 0.05%-0.2% of an acid catalyst, 0.2%-0.5% of a non-silicon flatting agent, 0.05%-0.2% of a defoaming agent and 15%-20% of deionized water, the acid value of the acrylic modified polyester resin is 40-50 mgKOH / g, and the solid content of the acrylic modified polyester resin is 60%-65%; the hydroxyl value of the polyurethane acrylate oligomer is 50 to 70mg KOH / g, and the solid content of the polyurethane acrylate oligomer is 60 to 65 percent. The primer can realize uniform spreading of UV ink, stable adhesion in the whole period and compatibility of multiple sterilization processes.

The utility model particularly relates to a short-cut nitrification-anaerobic ammonia oxidation integrated reactor. The reactor comprises a short-cut nitrification area, a sponge iron area, an anaerobic ammonia oxidation area and an autotrophic denitrification area. According to the growth characteristics of different bacteria, environment control is performed in a targeted manner, so that the different bacteria are in respective optimal growth conditions, the activity of the bacteria is ensured, and the system is more efficient. In addition, nitrite nitrogen in the reactor is consumed while being generated, the concentration of the nitrite nitrogen in the system is low, and the problem of inhibition of high nitrite nitrogen concentration on anaerobic ammonium oxidation bacteria is solved. According to the reactor, the short-cut nitrification reaction and the anaerobic ammonia oxidation reaction are arranged in the same system, the anaerobic ammonia oxidation reaction can supplement needed alkalinity for the short-cut nitrification reaction, consumption of extra chemical agents is reduced, cost is saved, and the reactor has high practical value.

The utility model discloses a novel anaerobic ammoxidation granular sludge device, which relates to the technical field of biological sewage treatment, and comprises a tank body, a primary three-phase separator and a secondary three-phase separator, a conical water distribution cover is arranged in the tank body, a water distribution pipe is arranged on the surface of the conical water distribution cover, and the secondary three-phase separator is arranged in the tank body. The water distribution pipe comprises a plurality of annular pipes and connecting pipes, the plurality of annular pipes are sequentially arranged on the conical water distribution cover from bottom to top from large to large, and every two annular pipes which are adjacent up and down are connected through the corresponding connecting pipe, so that the conical water distribution cover and the water distribution pipe are arranged, and the water distribution pipe is arranged on the conical water distribution cover in a conical manner; compared with a mode of arranging water distribution pipes on a two-dimensional plane in the prior art, more water distribution pipes can be arranged in the same occupied area through a conical three-dimensional pipe arrangement mode, so that more water outlet points are provided, the density is higher, the water flow distribution is more uniform, and the sewage treatment effect is better.

The invention discloses a method and a device for realizing deep denitrification of urban sewage by an improved step-feed anaerobic ammonia oxidation enhanced Bardenpho process, and belongs to the field of biological sewage treatment. The device comprises an urban domestic sewage raw water tank, a continuous flow sectional water inlet reactor and a vertical flow type sedimentation tank. The continuous flow reactor is alternately designed in an anaerobic mode, an anoxic mode, an aerobic mode, an anoxic mode, an aerobic mode and an anoxic mode (A / An / O / An / O / An), an anoxic zone is added at the rear position of an original burka process, deep denitrification is achieved, and nitrate nitrogen carried by effluent return sludge is reduced. Sewage is divided into three sections and respectively enters the anaerobic tank, the second anoxic tank and the third anoxic tank of the reactor in proportion, so that the cost of adding a carbon source and the traditional nitrification liquid backflow are saved, and a low-carbon-nitrogen-ratio environment is created to provide favorable conditions for short-cut denitrification. Meanwhile, anaerobic ammonia oxidation biological carriers are put into all the anoxic tanks to better retain flora, coupling of anaerobic ammonia oxidation and a short-range process is stably achieved in the continuous flow reactor, and energy consumption and cost are greatly reduced while the denitrification efficiency of the system is improved.