48results about How to "Long reaction life" patented technology

The invention relates to a synthesis method of a low-silicon nano SAPO-34 molecular sieve, which comprises the following steps: sequentially mixing a silicon source, an aluminum source, a template agent R, deionized water and a phosphorus source to obtain a gel mixture; placing the gel mixture in a stainless steel high-pressure reaction kettle of which the liner is made of polytetrafluoroethylene, sealing, putting into a drying oven, and performing primary traditional hydrothermal crystallization; adding a dispersant agent S into the primary traditional hydrothermal crystallization solution, stirring for 0.5-4 hours, transferring into the reaction kettle of which the liner is made of polytetrafluoroethylene, sealing, putting into a microwave reactor, and performing secondary microwave hydrothermal crystallization; and washing, drying, and roasting to obtain the nano SAPO-34 molecular sieve. Compared with the prior art, the invention greatly lowers the crystallization temperature and shortens the time of the whole synthesis process. The nano molecular sieve can be widely used for conversion, separation and absorption of hydrocarbons, and especially has the advantages of high conversion rate, high low-carbon alkene selectivity, low carbon deposition rate, long reaction life and the like in the process of preparing alkene from methanol.

The present invention is efficient oxidizing catalyst for organic waste water treating and its preparation process and application. The carrier prepared with composite powder of Ti, Si, Al and RE oxide and in the average granularity smaller than 100 nm is loaded with at least two kinds of transition metal to prepare the catalyst. The catalyst contains TiO2-SiO2-Al2O3 65-85 wt%, RE oxide 5-15 wt%, and transition oxide 5-30 wt%. The preparation process of the catalyst includes preparing carrier powder with the carrier components and through precipitation, homogenization, ageing, filtering, washing, pulping, dispersing, fluidizing at supercritical condition to eliminate water and activating; forming the carrier, soaking, fluidizing and drying, and activating to obtain the catalyst. The catalyst is used in acid organic waste water treatment and has COD degrading rate higher than 95 %, ammonia nitrogen oxidizing conversion rate higher than 99 % and chroma eliminating rate higher than 95 %.

The invention provides a metal modification ZSM-5 molecular sieve based catalyst. The catalyst is characterized in that the catalyst is prepared by modifying and preparing a ZSM-5 molecular sieve through a hydrothermal method by means of modification elements, wherein the modification elements are La and/or Ce; the total mass of ZSM-5 in ZSM-5 molecular sieve based catalyst is 100%, and the mass content of modified elements is 0.01-15%; preferentially, the metal modification ZSM-5 molecular sieve is used for light dydrocarbon catalytic cracking to prepare low carbon olefin, and light hydrocarbon is alkane or olefin simple substance or a mixture with the carbon number being 4-8. The metal modification ZSM-5 molecular sieve based catalyst is easy and convenient to operate and free of high-temperature operation, lowers energy consumption and improves modified element utilization rate, the modification effect is better than a traditional mode, the addition amount of modification elements is reduced, the selectivity of catalyst for low-carbon olefin is improved, the reaction service life is enhanced greatly in the long-period reaction, and the better application value is achieved.

The invention relates to hydrosenation catalyst for producing oil by converting heavy coal tar pitch into light coal tar pitch, which is characterized in that: 100 portions of macroporous alumina is immersed into 100 portions of solution which consists of 3.5 to 20.5 weight percent of nickel nitrate and 3.0 to 25.0 weight percent of molybdenum nitrate for 2 hours at a temperature of between 50 and 60 DEG C; the mixture stands and supernatant is poured out, and then the mixture is dried for 4 hours at a temperature of 120 DEG C, activated for 5 hours at a temperature of 480 DEG C, and then immersed into cupric nitrate solution, cobalt nitrate solution, silver nitrate solution, ferric nitrate solution or bismuth nitrate solution with a concentration between 1.1 and 12.0 weight percent; and the catalyst is prepared through immersion, drying and activation which are the same as the above. The content of the nickel oxide and the molybdenum oxide in the catalyst is respectively 1.2 to 11.2 weight percent and 1.1 to 15.4 weight percent of the weight of carrier, and the content of cupric oxide, cobalt oxide, silver oxide, ferric oxide or bismuth oxide is 1.1 to 7.8 weight percent of the weight of the carrier. The hydrogenation catalyst has good adaptability to various coal tar pitch raw materials, high hydrogenation degree, strong controllability, low operating cost, and high yield of the oil produced by converting the heavy coal tar pitch into the light coal tar pitch; and the overall oil yield of fuel can reach over 75 percent.

The invention discloses a CHA-RHO type composite molecular sieve as well as a preparation method and application thereof. The preparation method comprises the following steps: uniformly mixing a phosphorus source, an aluminum source and deionized water according to the mole ratio being (0.5 to 3):1:(50 to 100), drying, roasting and crushing to obtain granular phosphorous and aluminum dry glue; uniformly mixing the granular phosphorous and aluminum dry glue, a template agent R, a silicon source and the deionized water according to the mole ratio being 1:(0.5 to 3): (0.05 to 0.25):(25 to 50), crystallizing, cooling, carrying out suction filtering, washing and drying to obtain molecular sieve raw powder; roasting the molecular sieve raw powder to obtain CHA-RHO type SAPO (Silicoaluminophosphate) composite molecular sieve. The composite molecular sieve disclosed by the invention is prepared from 90 to 99 weight percent of CHA type molecular sieve and 1 to 10 weight percent of RHO type molecular sieve; in a composite molecular sieve framework, the mole ratio of SiO2 to Al2O3 is (0.05 to 0.35):1. The composite molecular sieve has the advantages of small crystalline grains, low silicon content, long service life and high catalytic activity; the composite molecular sieve is used for a catalyst for a reaction of preparing lower olefins by catalytic dehydration of methanol and high higher olefin selectivity; by means of the composite molecular sieve, the oligomerization of the lower olefins can be greatly reduced, so that the yield of the olefins is increased; the composite molecular sieve can be used as an adsorbent for adsorbing and separating small-molecule gases.

The invention relates to a method for preparing aromatic hydrocarbon by methyl alcohol at high selectivity, and relates to aromatic hydrocarbon. The method comprises the following steps of pretreating a catalyst; catalyzing: after the catalyst is pretreated, adding reaction raw materials, forming the methyl alcohol and a hydrogen trapping-removing agent, and reacting by a solid catalyst bed layer at the air speed of 500 to 10000h<-1>, so as to obtain the aromatic hydrocarbon; adding a salt compound of metal element into a solvent, dispersing by ultrasonic waves, adding a modified acid zeolite molecular sieve, and continuing to disperse by ultrasonic waves, so as to obtain a mixture; sucking, filtering and washing the mixture, and drying a filter cake; calcining the dried sample, and reducing, so as to obtain the catalyst. The method has the characteristics that when the aromatic hydrocarbon is prepared by the methyl alcohol, the aromatic hydrocarbon selectivity is excellent, the methane and C5+ hydrocarbon selectivity is low, and the catalyst selectivity is high; the aromatic hydrocarbon selectivity is 85% or above, and the methane selectivity is lower than 2%.

The invention discloses a preparation method of a ZnO-ZrO2@Al2O3@SAPO-34 dual-core-shell catalyst. The preparation method comprises the following steps: preparing ZnO-ZrO2@Al2O3 powder; taking Al2O3,P2O5, SiO2, MOR and H2O in a molar ratio of 1.0:0.8:0.6:2.5:80; adding pseudo-boehmite, ethyl orthosilicate and a template agent morpholine to an orthophosphoric acid solution sequentially while stirring, performing uniform stirring continuously, and performing stirring and aging for 24h at room temperature to form a sol system; adding 200-400-mesh ZnO-ZrO2@Al2O3 powder to the system according tothe core-shell mass ratio of ZnO-ZrO2@Al2O3: SAPO-34 of (1:4)-(4:1), performing uniform stirring continuously, and then, transferring the product into a reactor; and performing hydrothermal crystallization for 24-48h at 190-210 DEG C, performing cooling and filtration, performing washing to neutrality with deionized water, performing drying for 6h at 105 DEG C, and performing roasting for 3h at 500-600 DEG C to obtain the catalyst. The catalyst prepared by the preparation method disclosed by the invention can simultaneously improve the conversion rate of carbon dioxide and the selectivity of low-carbon olefin in a two-step process for preparing low-carbon olefin by CO2 hydrogenation through methanol.

The invention provides a composite mesoporous-microporous structure SAPO-34 molecular sieve and a synthesis method thereof. A long-chain quaternary ammonium salt is adopted as a novel organic structure directing agent to synthesize an SAPO-34 molecular sieve catalyst with mesopores and micropores at the same time. The novel organic structure directing agent is an organic long-chain quaternary ammonium salt with an R1-(CH3)2N-R2 structure, wherein R1 is a straight-chain or branched-chain alkyl group containing 2-4 carbon atoms or a cycloalkane group containing 4-8 carbon atoms, R2 is a straight-chain or branched-chain alkyl group containing 10-30 carbon atoms, and anions can be one or more of hydroxide ions, chloride ions, bromide ions and the like. Compared with an SAPO-34 catalyst prepared from other template agents, the SAPO-34 molecular sieve catalyst synthesized by the method has a unique composite mesoporous-microporous structure, and the service life of the catalyst can be prolonged to a certain extent while the selectivity of ethylene and propylene in MTO reaction is effectively improved.

The invention relates to a layer structure catalyst for directly preparing ethylene, propylene and butene through hydrogenation of carbon dioxide. The layer structure catalyst for directly preparing the ethylene, the propylene and the butene through hydrogenation of the carbon dioxide is prepared in the steps of mixing iron nitrate nonahydrate, potassium carbonate and titanium dioxide under a certain condition and then calcining an obtained mixture at a certain temperature for two times by using a high temperature solid state method so as to prepare the layer structure catalyst. The layer structure catalyst for directly preparing the ethylene, the propylene and the butene through hydrogenation of the carbon dioxide has the advantages that a stable layer structure is obtained, the layer structure can be stably kept before and after the reaction of directly preparing the ethylene, the propylene and the butene through hydrogenation of the carbon dioxide, olefin secondary reaction caused by readsorption of primary olefin is inhibited to a certain degree, and high olefin selectivity is realized in the reaction of preparing low carbon olefin through hydrogenation of the carbon dioxide. Apreparation method is simple and environmentally friendly and has potential application values.

The invention discloses a device and method for efficiently converting volatile organic compounds. The lower section of the device is a fluidized bed section, the upper section of the device is a fixed bed section, the fluidized bed section and the fixed bed section are separated by a porous distribution plate, and a metal wire mesh layer for preventing solids of the fluidized bed section from moving upwards, inlets of volatile organic compounds, water vapor and catalysts and outlets of a carbon product and a gas product are arranged. The method comprises the following steps: respectively filling the fluidized bed section and the fixed bed section with the nano-metal supported catalysts with different particle sizes. Conversion energy is provided through external heating, and heat is supplied to the catalyst of the fixed bed section through gas of the fluidized bed section, water vapor is introduced into the middle of the reaction device, the fluidized bed section is controlled to produce a large number of the carbon product, carbon deposition is avoided in the fixed bed section, and a long catalyst life is maintained. By utilizing the method, the volatile organic compounds are efficiently converted and directly discharged, meanwhile, the carbon nano material is prepared, and the additional value is increased. The device has the advantages of compact structure, low investment and easiness in amplification.

The invention relates to a CO2 trapping system based on a chemical-looping combustion coupled supercritical hydrothermal reaction, and a working method. In an existing chemical-looping combustion cycle reaction, an oxygen carrier is sintered and melted, and consequently the cycle reaction rate is decreased. The CO2 trapping system comprises a chemical-looping combustion system which comprises an air reactor, a pyrolyzing furnace, a fuel reactor and a cyclone separator, and the pyrolyzing furnace is connected with the air reactor. The CO2 trapping system is characterized by further comprising aCO2 storage device, a coal water slurry system and a supercritical hydrothermal reaction system, wherein the coal water slurry system comprises coal grinding equipment, a water storage tank, a mixingtank, a colloid tank and a slurry storage tank, and the water storage tank, the mixing tank, the colloid tank and the slurry storage tank are sequentially connected through pipelines; and the supercritical hydrothermal reaction system comprises a high-pressure coal water slurry pump, a supercritical water oxidation reactor, a preheater and a CO2 separator, and the preheater is connected with thesupercritical water oxidation reactor. The chemical-looping combustion economy and the energy utilization efficiency are improved, and CO2 can be trapped with the low cost and low energy consumption.

The invention discloses a symbiotic composite molecular sieve catalyst applied to a MTO reaction, and a preparation method thereof. The catalyst is mainly formed by symbiotic compounding of SAPO-34 and RUB-50 molecular sieve structures, wherein the SAPO-34 molecular sieve accounts for 60-99% of the total weight of the catalyst, the RUB-50 molecular sieve accounts for 1.0-40% of the total weight ofthe catalyst, the silicon-to-aluminum molar ratio of the oxide in the symbiotic composite molecular sieve is 20-200, and the X-ray diffraction spectrogram of the symbiotic composite molecular sieve shows that the symbiotic composite molecular sieve has a characteristic diffraction peak with relative intensity at a specific 2theta angle. According to the invention, the RUB-50 with the LEV structure and the SAPO-34 with the CHA structure form a symbiotic composite molecular sieve, and the symbiotic composite molecular sieve has two molecular sieve structure characteristics to generate the specificity of the structure, so that the composite molecular sieve has reasonably distributed acidity and good hydrothermal stability, overcomes the limitations of the components, has good catalytic activity, high ethylene and/or propylene selectivity and excellent service life in MTO reaction, well meets the requirements of industrial application, and has broad application prospects.

The invention discloses a method for quickly synthesizing an SAPO-34 molecular sieve and a catalyst prepared from the molecular sieve. The method is characterized in that the organic amine with a (CH3)2NR structure is used as a major solvent and a template agent for synthesis to perform molecular sieve synthesis.

The invention relates to a preparation method for a hollow micro-mesoporous ZSM-5 molecular sieve. The preparation method comprises the following steps: dispersing a template agent into a pH regulatorso as to obtain a dispersion A of the template agent, then dissolving an aluminum source into the dispersion A so as to obtain a uniformly-mixed solution B, then adding a silicon source so as to obtain a gel C, wherein the molar ratio of Al2O3 to SiO2 to M2O to R to H2O is 1: (8-200): (20-60): (10-20): (200-1000), M represents Na or K, R represents the template agent with a structural formula which is described in the specification, and in the structural formula, R is CH3(CH2)n, n has a value range of 1 to 6, and X- is Br- or Cl-; subjecting the gel C to evaporation and concentration so as toobtain a gel D, wherein the mass of the gel D accounts for 50% to 60% of the mass of the gel C; crystallizing the gel D in a temperature range of 180 DEG C to 220 DEG C for 1 to 3 d, and carrying outcooling to a room temperature; and filtering a product obtained in the step (3), and carrying out washing, drying and calcining so as to obtain the hollow micro-mesoporous ZSM-5 molecular sieve.

The invention discloses a metal-modified hollow SAPO-34 molecular sieve and a production method and application thereof. The molecular sieve is of a structure with a locally-transparent surface and cubic hollow interior. Production of the molecular sieve comprises the steps of adopting a cheap organic amine as a template, introducing a structure promoter and a metal element, and conducting crystallization under a traditional hydrothermal condition. The synthesized SAPO-34 molecular sieve is high in crystallinity degree, the average grain size is 2-10 [mu]m, and the molecular sieve structure of the locally-transparent surface and the cubic hollow interior benefits diffusion and mass transfer of reactants and products in a catalytic reaction. A synthesized SAPO-34 molecular sieve catalyst is used for a reaction of methyl alcohol or dimethyl ether transformation to a low-carbon olefin, the ethylene selectivity and the propylene selectivity are high, and meanwhile, the metal-modified hollow SAPO-34 molecular sieve has the character of a long service life. The method is simple in process, fast, low in cost and suitable for industrial scale-up application.

The invention provides a synthesis method of a SAPO-34 molecular sieve with surface defects. The method comprises the following steps: after mixing a silicon source, an aluminum source, a phosphorus source, a template agent and water according to the mol ratio of SiO2 to Al2O3 to P2O5 to R to H2O of (0.5 to 0.8) to 1 to (0.8 to 1.2) to (1 to 3) to (40 to 80), carrying out dynamic hydrothermal crystallization at the low temperature of 170 to 190 DEG C and under a short-time condition of 2 to 15h, so as to obtain a cubic-shape SAPO-34 molecular sieve with the surface defects. According to the technical scheme provided by the invention, the obtained SAPO-34 molecular sieve has the surface defects and excellent methanol to olefin catalytic performance.