111results about How to "Strong ability to resist carbon deposition" patented technology

The invention relates to an anti-carbon-deposition Ni-based catalyst for hydrogen production by methane steam reforming and a preparation method thereof. By taking lanthanum nitrate, praseodymium nitrate, samarium nitrate, yttrium nitrate, zirconium nitrate, zirconium carbonate, zirconium oxychloride, and the like as precursors and taking ammonia as a precipitant, a pyrochlore composite oxide is prepared through using a coprecipitation method; and then the pyrochlore composite oxide is mixed with alumina by using a mechanical mixing method so as to obtain a pyrochlore alumina composite carrier. Nickel nitrate, nickel chloride, nickel sulfate, nickel oxalate and the like serving as nickel sources are loaded on the pyrochlore alumina composite carrier through direct immersion. The loading capacity of nickel in the catalyst accounts for 5-30% of the weight of the catalyst, the pyrochlore content of the catalyst is 5-50%, and the alumina content of the catalyst is 20-90%. By taking the pyrochlore alumina composite oxide as a carrier, the reaction activity and anti-carbon-deposition performance of the catalyst can be greatly increased; the preparation method of the catalyst is simple; and the catalyst has excellent catalytic activity and stability to methane steam reforming in a stationary bed.

The invention relates to a catalyst for synthesising acrylic acid (ester), especially relates to a vanadium-phosphorus-zirconium-titanium composite oxide catalyst for synthesising acrylic acid and ester as well as a preparation method and application of the vanadium-phosphorus-zirconium-titanium composite oxide catalyst, and belongs to the field of catalytic material preparation technologies and application. The catalyst disclosed by the invention takes one or the mixture of more of TiO2, SiO2 and a molecular sieve as a support for supporting active components and active auxiliaries; the active components are composite oxides of V, P, Zr and Ti, and the active auxiliaries are one or more oxides of B, Al, Ce and La and can be used for modifying the support. The catalyst disclosed by the invention is used in the reaction of synthesising acrylic acid (ester) from formaldehyde and acetic acid, and has high activity and selectivity; the per-pass conversion rate of the acetic acid achieves 50%, and the selectivity of the acrylic acid and ester of products is up to 90%; moreover, the catalyst is good in thermostability, and good in water resistance and carbon deposition resistance.

The invention discloses a nickel-based catalyst as well as a preparation method and application thereof. The nickel-based catalyst has the following structural general formula: xNi.yCeAlO3.(100-x-y) Al2O3, wherein 1<=x<=20, 1<=y<=30. The catalyst is prepared by the following steps of: firstly, impregnating dried gamma-Al2O3 in a ceric salt solution at room temperature by using an incipient-wetness impregnation method, drying and roasting at the air atmosphere to obtain a modified carrier; then impregnating the modified carrier obtained at room temperature in a nickel salt solution by using the incipient-wetness impregnation method, drying and roasting at the air atmosphere to obtain a catalyst precursor; and finally, reducing the obtained catalyst precursor in hydrogen gas at 850-1050 DEGC. The catalyst provided by the invention has the advantages of strong coke resistance, good reaction stability and heat stability, high chemical and structural stability and the like and can be usedas the catalyst for preparing synthesis gas from methane.

The invention discloses a method for preparing propylene by methanol, which consists of the following procedures: a. methanol is used as raw material to generate reacting effluent I after passing through a first reactor at the temperature of 150-350 DEG C; in the first reactor, at least one solid acid catalyst chosen from activated aluminum oxide, heteropoly acid and molecular sieve is provided; b. the reacting effluent I is mixed with thinner water, with a mass ratio of 0.2-5:1 between methanol and water; at the temperature of 400-550 DEG C, the mixture passes through a second reactor provided with HZSM-5 molecular sieve catalyst; the mass of airspeed of methanol relative to the HZSM-5 molecular sieve catalyst is 0.2-10h<-1>; and effluent II containing propylene is generated. The method for preparing propylene by methanol has the advantages of high selectivity of propylene and good stability of catalyst by means of the advantages of high activity, little carbon deposit, and strong anti-carbon capacity of nanometer ZSM-5 molecular sieve.

The invention discloses a catalyst for hydrogen production by bio-oil steam reforming and a preparation method thereof. The catalyst consists of 5-25wt% of active component nickel, 0-10wt% of an alkali metal promoter, 0-10wt% of a noble metal promoter, and 55-95wt% of a cerium-zirconium compound oxide carrier. The preparation method comprises the following steps: 1) preparing the cerium-zirconium compound oxide carrier; and 2) mixing aqueous solution of soluble nickel salt with aqueous solutions of the catalytic promoters according to the proportion of the catalyst components, stirring evenly, dipping the cerium-zirconium compound oxide carrier in the mixed solution, stirring, ultrasonically dispersing, dipping, drying, roasting, and reducing at the temperature of 400-600 DEG C in hydrogen atmosphere to obtain catalyst powder. The catalyst is applicable to normal pressure, and has the advantages of simple preparation method, high reaction activity, strong anti-carbon deposition ability, good stability, low cost and the like, thus greatly enhancing the transformation ratio of the bio-oil, the hydrogen production rate and prolonging the service life of the catalyst.

The invention relates to a mesoporous Co/CeO2 catalyst for a hydrogen preparation reaction by reforming an ethanol vapor and a preparation method thereof. The size of the particle diameter of a mesoporous CeO2 carrier is 12nm or so; the specific surface area of the mesoporous CeO2 carrier can reach up 177m<2>/g; the pore structures of the mesoporous CeO2 carrier are sequentially arranged in a short range; the bore diameters of the mesoporous CeO2 carrier are mainly distributed within 3nm or so; cobalt (Co) taken as an active component is carried on the mesoporous CeO2 carrier; the carrying quantity of CoO2 is 5% to 20% of the mass of the catalyst. The mesoporous CeO2 prepared by using a hard template method has the large specific surface area, the short-range and sequential pore structures and the uniformly distributed bore diameters. The mesoporous CeO2 prepared from mesoporous carbon CMK-3 is mainly used for exposing a high-energy crystal face (110) and has a better oxygen storing/releasing capacity.

The invention relates to a method for preparing a vulcanization type gasoline hydrogenation upgrading catalyst. Gasoline hydrogenation catalysts are treated by vulcanizing agents with multiple sulfur ions and organic nitride which is used as a passivator at the low temperatures, active components in the gasoline hydrogenation catalysts comprise a type or a plurality of types of Mo and W of VI B groups and Co and Ni of VIII B groups, and stabilizers comprise a type or a plurality of types of Zn and Cd of II B groups, Na and K of I A groups and rare earth metal La and Ce. The method has the advantages that cascade full vulcanization can be carried out on metal oxide or precursors of the metal oxide, and strong acidic sites in ZSM-5 molecular sieve composite carriers can be selectively passivated; the vulcanization type gasoline hydrogenation upgrading catalyst prepared by the aid of the method is short in on-stream time, high in hydrogenation and olefin reduction upgrading activity, selectivity, carbon deposition resistance and liquid yield and low in octane number loss, and accordingly the method and the vulcanization type gasoline hydrogenation upgrading catalyst are particularly applicable to producing clean gasoline components from inferiorly catalytically cracked gasoline by means of hydrogenation and olefin reduction upgrading at a low cost.

The invention relates to a solid acid catalyst and a preparation method and applications thereof. The catalyst includes lanthanide rare earth metal ions, halogen and a carrier. The carrier includes aboron-silicon composite oxide and silicon oxide; and the boron-silicon composite oxide is an amorphous compound, and can be obtained by mixing boron source and silicon source compounds, adjusting pH to form gel, adding a surfactant as a pore forming agent during a gel synthesizing process, and performing hydrothermal reaction, hole expansion with ammonia, drying and roasting, etc. According to thecatalyst, the amorphous boron-silicon composite having a high specific surface area and specific pore size distribution is molded to form the carrier and a lanthanide rare earth metal oxide which canform a specific acid site and the halogen are added for modification. The catalyst can be used for direct amination of isobutene to prepare tert-butylamine; and high isobutene one-way conversion rateand tert-butylamine selectivity can be achieved, and the catalyst has good stability.

The invention discloses a catalyst used for producing dimethyl ether through methanol dehydration, and a preparation method thereof. The catalyst comprises an active component, an auxiliary agent and a carrier. The active component is heteropoly acid ammonium salt. The auxiliary agent is lanthanum oxide and/or cerium oxide. The carrier is silicon oxide. The preparation method comprises the following steps: alkane, an organic acid, and an ammonium-containing alkaline solution or ammonia gas are sequentially loaded on the silicon oxide carrier; heteropoly acid and the auxiliary agent are loaded on the carrier; and drying and roasting are carried out, such that the catalyst is obtained. The catalyst provided by the invention has relatively high low-temperature activity, selectivity and coking resistance. Also, the stability of the catalyst is improved. The catalyst provided by the invention is especially suitable for a reaction for producing dimethyl ether with a methanol raw material with relatively high water content.

The invention discloses a coke oven gas hydrodesulfurization catalyst and a preparation method thereof. The catalyst comprises, by weight percentage, 1-6% of Fe2O3, 5-15% of MoO3, 73-92% of Al2O3, 0.1-4% of auxiliary I and 0-8% of auxiliary II. The catalyst has the advantages that the catalyst is prepared by an impregnation method, the added auxiliary I can increase the activity of the catalyst and is helpful to the carbon elimination reaction process during the reaction, the anti-carbon ability of the catalyst is increased, and the service life of the catalyst is prolonged; the added auxiliary II can increase the dispersity of Mo on the surface of a carrier so as to increase the activity of the catalyst; a co-impregnation method using Fe, Mo and the auxiliary I is used in the preparation process, and even loading of various components is guaranteed; the catalyst is high in activity, high in anti-carbon ability and the like, and the preparation method is simple and capable of easily achieving industrial production.

The invention discloses a sulfur-resistant methanation catalyst, which is used for preparing methane from coke oven gas. The catalyst is a precipitation type catalyst which mainly adopts oxides of Mo, Co and Ni as active ingredients, Al2O3 as a carrier and La2O3 as an accelerant. The catalyst can be used for realizing good methanation of coke oven gas containing 1-3 ppm of H2S at1.0-3.0 MPa and 280-450 DEG C on the premise of not deeply purifying coke oven gas, and also has good selectivity. The invention also discloses a preparation method of the sulfur-resistant methanation catalyst.

The invention discloses an iron-based catalyst prepared by a sol-gel combustion method, which is characterized by containing a metal element Fe, a metal element A and a metal element B, wherein A is at least one selected from the group consisting of Mn, Co, Cu, Zn, Ti, Al, Cr, Ni, Ce, and Zr; B is at least one selected from the group consisting of Li, Na, K, Mg, and Ca; each metal element exists in the form of a metal simple substance and/or a metal oxide; and the content of the metal element A in the catalyst is 0.1-50 wt%, the content of the metal element B in the catalyst is 0.01-40 wt%, and the content of the metal element Fe in the catalyst is 50-99 wt%, based on the total amount of the metal elements contained in the catalyst. The catalyst has good resistance to carbon deposition, is used for reaction of preparation of low-carbon olefins by use of synthetic gas, and shows higher catalytic activity and low-carbon olefin selectivity.

A method for synthesizing flaky SAPO-34 comprises the following steps: carrying out reduced pressure distillation on an SAPO-34 crystallization mother liquor, evaporating away a part of water, addingan aluminum source, a phosphorus source, a silicon source and fluoride, uniformly dispersing the added substances, adding the obtained solution into a kettle, and crystallizing the solution to obtaina crystal nucleus solution; sequentially adding the aluminum source, the silicon source, an organic amine template and the phosphorus source to deionized water, and fully dispersing the added substances to form an initial gel; and adding a crystal nucleus solution to the initial gel, uniformly dispersing the initial gel, adding the obtained solution to a high pressure reactor, crystallizing the solution, and centrifuging, washing, drying and calcining obtained crystals to obtain flaky SAPO-34 raw powder. The method effectively prolongs the MTO catalysis life of the SAPO-34 molecular sieve, andreuses a large amount of the crystallization mother liquor produced in the production process of the SAPO-34 molecular sieve.

The invention discloses a nickel-cobalt based catalyst as well as a preparation method and application thereof. The catalyst has the following structural general formula: xNi.yCo.zCeAlO3.(100-x-y-z) Al2O3, wherein 0.5<=x<=15, 0.5<=y<=5 and 1<=z<=30. The catalyst is prepared by the following steps of: firstly, impregnating dried gamma-Al2O3 in a ceric salt solution at room temperature by using an incipient-wetness impregnation method, drying and roasting to obtain a modified carrier; then impregnating the modified carrier obtained at room temperature in a mixed water solution of nickel salt and cobalt salt by using the incipient-wetness impregnation method, drying and roasting to obtain a catalyst precursor; and finally, reducing the obtained catalyst precursor in hydrogen gas at 850-1050 DEG C. The catalyst provided by the invention has the advantages of strong coke resistance, high reactivity and selectivity, good reaction stability and heat stability, high chemical and structural stability and the like and can be used as the catalyst for preparing synthesis gas from methane.

The invention provides a catalyst for preparing tetrafluoroethylene and hexafluoropropylene through catalytic cracking of trifluoromethane and a preparation method thereof. The catalyst is prepared through the steps of preparing a precursor from a carrier and an active component through an impregnation method and then carrying out roasting and trifluoromethane fluorination; the carrier is Al2O3 orAlF3; the active component is one or a combination of two of nitride and nitrate of Cs, La, Sm, Pd, Pt, K or Na. The preparation method provided by the invention is simple, is capable of catalytically cracking the trifluoromethane under lower temperature and mild conditions, and is low in equipment requirements, low in energy consumption and low in cost; the prepared catalyst is capable of effectively reducing the reaction temperature of the catalytic cracking of the trifluoromethane, the conversion rate of raw materials and selective increment of a target product can be realized under milderconditions, the problem of coking of the catalyst can be effectively solved, and the service life of the catalyst can be prolonged.

The invention discloses a sulfur-free nickel-molybdenum bimetallic catalyst Ni-Mo/TiO2-SiO2 and a method for catalyzing hydrodeoxygenation of fatty acid methyl ester by the sulfur-free nickel-molybdenum bimetallic catalyst Ni-Mo/TiO2-SiO2. The catalyst has the advantages of high catalytic activity, strong carbon deposition resistance, easiness in separation from a liquid product and the like. Whenthe mass ratio of the catalyst to the reaction raw material methyl laurate to the reaction solvent is 0.1: 1: 20, the reaction temperature is 300 DEG C, and the reaction time is 4 hours, the mass yield of the obtained hydrodeoxygenation product n-dodecane product is up to 92%, and the purity mass percent of the product is up to 95%.

The invention provides a method for maximally producing aromatic hydrocarbons from catalytic cracking gasoline. The method comprises pre-hydrogenating catalytic cracking gasoline to obtain pre-hydrogenated catalytic cracking gasoline, dividing the pre-hydrogenated catalytic cracking gasoline into a light fraction, a middle fraction and a heavy fraction, extracting the middle fraction through a solvent to obtain olefin-rich raffinate and aromatic-rich extract, carrying out mild aromatization on the light fraction and the raffinate to obtain an aromatization product, recovering the light olefinfrom the extract to obtain a light olefin and sulfur-rich oil, carrying out selective hydrodesulfurization on the heavy fraction and the sulfur-rich oil to obtain a desulfurized heavy fraction, and carrying out aromatic extraction or extraction rectification on the aromatization product and the desulfurized heavy fraction. The method realizes olefin reduction, desulfurization and octane value increasing treatment on catalytically cracked gasoline and maximizes aromatic hydrocarbon production.

The present invention discloses a heteropolyacid ammonium salt catalyst and a preparation method thereof. The catalyst comprises an active component, auxiliary agents and a carrier, wherein the active component is a heteropolyacid ammonium salt, the auxiliary agents are nickel, phosphorus and vanadium, the carrier is an amorphous silicon-aluminum coated molecular sieve, the auxiliary agents comprise (calculated as the oxide) 3.0-10.0% of P2O5, 0.2-4.0% of V2O5 and 8-20% of NiO by adopting the weight of the carrier as the reference, the heteropolyacid ammonium salt content is 8-30% by adopting the weight of the catalyst as the reference, and the total content of the auxiliary agents and the carrier is 70-92% (calculated as the oxide). According to the present invention, the catalyst has advantages of high low-temperature activity, high selectivity, high carbon deposition resistance and improved stability, and is particularly suitable for the ethylene preparation reaction through dehydration by using the low-concentration ethanol aqueous solution as the raw material.

The present invention discloses a heteropolyacid ammonium salt catalyst and a preparation method thereof. The catalyst comprises an active component, auxiliary agents and a carrier, wherein the active component is a heteropolyacid ammonium salt, the auxiliary agents are nickel oxide and ferric oxide, and the carrier is amorphous silicon-aluminum coated silica. The catalyst of the present invention has advantages of high low-temperature activity, high selectivity, high carbon deposition resistance and improved stability, and is particularly suitable for the ethylene preparation reaction through dehydration by using the low-concentration ethanol aqueous solution as the raw material.

The invention discloses a method for preparing dimethyl ether (DME) through methanol dehydration. According to the method, a catalyst A and a catalyst B are subjected to graded loading. The catalyst A is composed of an active component heteropoly acid ammonium salt, an auxiliary agent lanthanum oxide and/or cerium oxide, and a carrier silicon oxide. The catalyst B is composed of an active component heteropoly acid, an auxiliary agent lanthanum oxide and/or cerium oxide, and a carrier silicon oxide. According to the invention, the two catalysts cooperate with each other, and fully perform their advantages. Under a situation with a relatively low reaction temperature, the catalysts comprehensively have relatively high activity and selectivity.

The present invention discloses a heteropolyacid ammonium type catalyst and a preparation method thereof. According to the catalyst, active components are heteropolyacid and a heteropolyacid ammonium salt, the auxiliary agent is nickel oxide, and the carrier is silicon oxide. The preparation method comprises: sequentially loading an organic acid, an ammonium-containing alkaline solution or ammonia gas, heteropolyacid and an auxiliary agent on a silicon oxide carrier to obtain a catalyst precursor, carrying out reduction treatment and furfural reaction treatment, impregnating in a heteropolyacid solution, drying, and calcining to obtain the catalyst. According to the present invention, the active component on the surface adopts the strong acidity heteropolyacid and the ammonium salt thereof as the main component, and the active component in the pore channel uses the weak acidity heteropolyacid ammonium salt as the main component, such that the catalyst has advantages of high low-temperature activity, high selectivity, high carbon deposition resistance and improved stability, and is particularly suitable for the ethylene preparation reaction through dehydration by using the low-concentration ethanol aqueous solution as the raw material.

The invention relates to a method for quickly detecting the carbon deposition resistance performance of methane synthesis catalyst. The method comprises the following steps: flatly filling the catalyst into the constant-temperature section of a methanation reactor; two sides of the catalyst are isolated, pressure is built for testing leakage, air is introduced into a nitrogen replacement system, then, pressure is built, nitrogen stops being introduced, hydrogen reduction catalyst is introduced, nitrogen stops being introduced after reaction is finished, pressure is released, hydrogen in the system is replaced by nitrogen, temperature is raised, and pressure is built after a situation that no hydrogen is detected in the system is confirmed; then, raw material gas used for methanation reaction is introduced to carry out methanation reaction, the inlet and outlet gas composition of the methanation reactor is measured by a gas chromatograph, a molar ratio of the carbonic oxide to the carbon dioxide of the outlet of the reactor is measured, and reaction time and a pressure difference value generated until reaction is finished are recorded; a carbon deposition amount and a catalyst particle integrity rate are measured, and a detected parameter is used for judging the index of the carbon deposition resistance performance of the catalyst.