383 results about "Hydrogen synthesis" patented technology

A method of producing a carbon dioxide product stream from a synthesis gas stream formed within a hydrogen plant having a synthesis gas reactor, a water-gas shift reactor, located downstream of the synthesis gas reactor to form the synthesis gas stream and a hydrogen pressure swing adsorption unit to produce a hydrogen product recovered from the synthesis gas stream. In accordance with the method the carbon dioxide from the synthesis gas stream by separating the carbon dioxide from the synthesis gas stream in a vacuum pressure swing adsorption system, thereby to produce a hydrogen-rich synthesis gas stream and a crude carbon dioxide stream and then purifying the crude carbon dioxide stream by a sub-ambient temperature distillation process thereby to produce the carbon dioxide product. A hydrogen synthesis gas feed stream to the hydrogen pressure swing adsorption unit is formed at least in part from the hydrogen rich stream.

The present invention provides an environmentally beneficial process using concentrated sunlight to heat radiation absorbing particles to carry out highly endothermic gas phase chemical reactions ultimately resulting in the production of hydrogen or hydrogen synthesis gases.

The invention discloses a catalyst for synthesizing methanol through carbon dioxide hydrogenation, which is composed of oxides, wherein measured by metals, the mole ratio of various metals is as follows: [n(Cu)+n(Zn)+n(MA)]:[n(Al)+n(MB)]=2-15, n(Cu):n(Zn)=0.5-4, n(MA):n(Zn)=0-1, and n(MB):n(Al)=0-9, MA represents monovalent or divalent metal ions, and MB represents trivalent or tetravalent metal ions. The catalyst has the advantages of high carbon dioxide conversion ratio, good methanol selectivity and high methanol yield.

The invention discloses a preparation method of a low-load-capacity and high-activity load type ruthenium catalyst using titanium dioxide as a carrier. According to the invention, the titanium dioxide is used as the carrier, an ageing solution is illuminated by using ultraviolet rays in a precipitation and deposition ageing process, thus interaction of a ruthenium precursor and the titanium dioxide is enhanced, the dispersion degree of the precursor is improved, and further the high-dispersion titanium dioxide loaded ruthenium catalyst is obtained. The preparation method has the advantages of simple equipment and process, high yield, and convenience for industrialized production; and the prepared ruthenium catalyst has the advantages of small ruthenium granularity and good reproducibility. The ruthenium catalyst is applied to a process for synthesizing methane by carbon dioxide through hydrogenation, and has high reactant transformation rate, high selectivity and good stability.

The invention provides a catalyst for synthesizing ethylene glycol by oxalate hydrogenation, and a preparation method and an application method of the catalyst. The preparation method comprises the steps of taking copper nitrate and copper acetate as copper sources, taking alkaline silica gel as a silicon source, and taking urea and ammonia water as a precipitant; adding a multi-hydroxyl organic matter; and preparing a Cu/SiO2 catalyst with a deposition-precipitation method. According to the method, the dimension and dispersity of copper species are adjusted and controlled by adding the multi-hydroxyl organic matter in the preparation process, and the aggregation of the copper species is inhibited by utilizing carbon deposition, so that the problem of easy sintering of the copper species at a high temperature is better solved. The application method for applying the catalyst to the synthesis of ethylene glycol by oxalate hydrogenation comprises the steps of firstly enabling the organic matter on the catalyst to form the carbon deposition at a relatively high temperature in an inert atmosphere; secondly switching inert gas to hydrogen in a cooling process after carbon deposition formation; and finally when the temperature is reduced to a reaction temperature, performing subsequent hydrogenation synthesis. The method has the characteristics that the catalyst does not need to be pre-roasted before use, and hydrogen pre-reduction does not need to be carried out for a long time, so that the preparation and use costs of the catalyst can be reduced.

The invention discloses a preparing method of a high-performance catalyst for hydrogenation of carbon dioxide for synthesizing methyl alcohol, belonging to the technical field of catalysts. The catalyst comprises mixed oxides of Cu, Zn and M, wherein M refers to Al, Nb, Mg or Zr; the molar ratio of CuO to ZnO to MxOy in the catalyst is 8 to 4-5 to 1-2; the preparing method comprises the following steps: performing parallel-flow precipitation on a saline solution containing active matters and a precipitator in a certain ratio to prepare an active component sizing agent A; performing parallel-flow precipitation on a saline solution containing carrier components and the precipitator to prepare a carrier sizing agent B; adding the sizing agent A to the sizing agent B, and violently beating; adding the saline solution containing the active matters and the precipitator in a certain ratio to prepare a catalyst sizing agent; and filtering, washing, drying and roasting to obtain the catalyst powder. The catalyst has a specific surface area as large as 160 m<2>/g, and is stable in structure, and the components are in close contact and achieve high synergistic effect, so that the catalyst has high activity and selectivity.

The invention discloses a catalyst for synthesizing methanol through CO2 hydrogenation, comprising Cu, Zn, Al, X, halogen and oxygen elements, oxides and halides, wherein the molar ratio of [Cu+Zn+MA] to [Al+Mb] is 2-18; the molar ratio of Cu to Zn is 0.5-5; the molar ratio of MA to [Cu+Zn] is 0-5; the molar ratio of MB to Al is 0-9; the molar ratio of halogen to Al is 0.05-5; MA and MB cannot be 0 at the same time; MA represents a mono-valent or divalent metal ion in X; MB represents a trivalent and/or tetravalent metal ion in X; X is one or a combination of more elements of Li, K, Mg, B, Ga, In, transition metal elements and rare-earth metal elements. The catalyst has the advantages of high carbon dioxide conversion rate, good methanol selectivity and high methanol yield.

The present invention relates to a catalyst for ethylene glycol synthesis through gas phase hydrogenation of dimethyl oxalate, a preparation method and applications thereof. The catalyst comprises CuO, a metal auxiliary agent oxide and silica, wherein the Cu element accounts for 10-50% of the total weight of the catalyst, and the metal auxiliary agent element accounts for 1-10% of the total weight of the catalyst. The invention further discloses the preparation method of the catalyst. According to the present invention, a soluble copper salt and a metal auxiliary agent soluble salt are used and are added with ammonia water to form an ammonia complex aqueous solution, aging-ammonia evaporation and co-precipitating are performed, and the obtained material and silica form the gel so as to form the stable chemical structure, such that the stability of the catalyst is substantially improved; during the preparation process, the organic modifier is added so as to effectively improve the pore structure and the specific surface area of the catalyst, and improve the activity of the catalyst and the ethylene glycol selectivity; and with the application of the catalyst in the dimethyl oxalate hydrogenation reaction, the service life is more than one year, the average conversion rate of dimethyl oxalate is more than 99.9%, and the ethylene glycol selectivity is more than 95%.

The invention relates to a preparation method of a copper based hydrogenation catalyst, and belongs to the technical field of catalyst preparation. The catalyst is prepared by adopting a staged precipitation method and is divided into two parts of a main body part and a surface auxiliary agent, the catalyst main body is composed of oxides of Cu, Zn and Al and is prepared by a co-precipitation method; the surface auxiliary agent includes one or more of Mg, Ba, Zr, Mn, Ga, Ce, La and Ti and is introduced to the surface of the catalyst main body by the chemical method. The prepared catalyst has the characteristics of high auxiliary agent utilization rate, high mechanical strength, and large number of strong alkaline sites in the surface, is used as a catalyst for a reaction for CO2 hydrogenation synthesis of methanol, and has high CO2 conversion rate and methanol selectivity.

The invention discloses a core shell catalyst by taking hydrotalcite as a shell and a molecular sieve as a core as well as a preparation and an application thereof. According to the invention, divalent metal source and aluminum species in a core-shell molecular sieve are used for forming a hydrotalcite compound on the surface of the molecular sieve, and the core-shell structure molecular sieve by taking the molecular sieve as the core and the petal hydrotalcite as the shell is formed; after the molecular sieve is reduced, the nano-grade metal-modified molecular sieve catalyst having uniform size, high dispersibility, excellent heat stability and high universality is obtained, and can be used for a catalytic reaction for hydrogenation synthesis of m-dinitrobenzene to obtain m-phenylenediamine. compared with the prior art, the preparation process is simple, the metal atom utilization rate is high, applied metal source is almost completely reacted, no loss is generated, cost is reduced, and pollution on environment is reduced, industrial production is easy, and a series of different metal-modified molecular sieve catalysts can be prepared according to the modifiable character of the composition elements of the hydrotalcite and diversity of a topological structure of the molecular sieve.

The invention discloses a method for synthesizing 2,5-dihydroxymethylfuran by selective hydrogenation of 5-hydroxymethylfurfural. The method is characterized in that a magnetic metal-organic coordination polymer is used as an acid and base bifunctional catalyst, low-price and easily-obtained low carbon alcohol is used as an in-situ hydrogen donor, and the 5-hydroxymethylfurfural is efficiently transformed into the 2,5-dihydroxymethylfuran by a selective transfer hydrogenation reaction under mild operation conditions and the maximum yield of the 2,5-dihydroxymethylfuran can be up to 98.6 percent. The magnetic metal organic coordination polymer used in the method disclosed by the invention has the advantages of relatively-high acid-base strength, more acid-base sites, relatively-large specific surface area and suitable pore size; in addition, the magnetic metal organic coordination polymer is simple in preparation process, is easy to separate and recover and shows excellent catalytic activity and catalytic stability. Furthermore, the low carbon alcohol is used as the in-situ hydrogen donor in the invention, so that the use of molecular hydrogen is avoided and the safety of the reaction process is improved; besides, the low carbon alcohol can be used as a reaction solvent and the introduction of exogenous substances is reduced, and thereby the production cost can be further reduced.

The invention provides a preparation method of catalyst of carbon dioxide hydrogenation methanol synthesis, which belongs to the technical field of preparation of catalyst. The preparation method includes adding dispersing agent in Cu(NO3)2, Zn(NO3)2 and Zr(NO3)4 so as to prepare mixed liquor, then titrating the mixed liquor into Na2CO3 liquor, adjusting the pH (potential of hydrogen) of the liquor to range from 7 to 8, allowing the liquor to stand after sufficient reaction so that the liquor is aged to obtain solid precipitate, and roasting the solid precipitate to obtain methanol catalyst after the roasted solid precipitate is cooled naturally. On the basis of preparing catalyst by a coprecipitation method, the dispersing agent is added so as to prepare the methanol catalyst. The preparation method has the advantages that the preparation method is simple in technological process and easy to realize industrialization, carbon dioxide conversion rate and methanol selectivity of products are high, and the like. The obtained catalyst is applicable to carbon dioxide hydrogenation catalytic reaction under medium and low pressure.

The invention provides an environment-friendly 2-methyl furan catalyst and a preparation method thereof and relates to a hydrogenation catalyst and a preparation method thereof. The catalyst is prepared by a colloid precipitation method and the active component Cu is dispersed highly. The catalyst mainly comprises the following components as per percentage by weight: 15 to 50 percent of CuO and 40 to 80 percent of silicon oxide or aluminum oxide. The catalyst is applied to preparation of 2-methyl furan through furfural gas phase hydrogenation, wherein the conversion rate of the furfural is 100 percent and the selectivity of the 2-methyl furan reaches over 92 percent. By the colloid precipitation method, sol can be effectively bound with Cu and aid; the Cu can be dispersed on the surface of the carrier highly; and the catalyst has high activity and stability in the reaction of synthesizing the 2-methyl furan by hydrogenating the furfural. The catalyst applied to preparation of the 2-methyl furan by hydrogenating the furfural has simple components and does not comprise Cr so as to avoid the environmental pollution caused by pretreatment on the Cr-containing industrial catalyst and treatment on the waste catalyst.

The invention discloses a 2-methyl furan catalyst and a preparation method thereof, and relates to a catalyst and a preparation method thereof. The catalyst comprises active ingredients, such as 30-50 mass percent of CuO, 40-60 mass percent of aluminum oxide or silicon oxide, and aids selected from CaO, BaO, Na2O, K2O, Sr2O and ZnO, wherein the total mass percent of one or two of the aids is 5-10. The 2-methyl furan catalyst is synthesized by virtue of furfural hydrogenation. The preparation method comprises the following steps: dissolving a metal copper salt and an alkali metal or alkaline-earth metal salt in alumina sol or silica sol; enabling the salts to react with a precipitator so as to obtain a precipitate, aging for 1-4 hours after the precipitation is finished, washing, drying, molding and roasting; and finally preparing an oxidation state precursor of the catalyst, wherein an addition mode of reacting a salt solution and the precipitator refers to a positive addition method, a back addition method or a parallel addition method. The component of the catalyst does not contain Cr, and the catalyst is green; and moreover, the catalyst has the high activity and the high selectivity, the furfural conversion rate is 100 percent, and the selectivity of the 2-methyl furan is over 90 percent.

The invention provides a production process and system of high-purity hydrogen and an ammonia synthesis process and system. The production process of high-purity hydrogen comprises the steps of generating water gas by using bituminous coal, generating shifted gas by using the water gas, desulfurizing the shifted gas, and carrying out decarbonization and hydrogen extraction on the shifted gas; the ammonia synthesis process comprises the steps of hydrogen nitrogen-feeding and deoxygenization, nitrogen-hydrogen compression and ammonia synthesis. The production system of high-purity hydrogen comprises a water gas generating part, a shifted gas generating part, a shifted gas desulfurizing part and a shifted gas decarbonization and hydrogen extraction part; and the ammonia synthesis system also comprises a hydrogen nitrogen-feeding and deoxygenization part, a nitrogen-hydrogen compression part and an ammonia synthesis part. The production process of high-purity hydrogen disclosed by the invention is short in flow, small in resistance, low in power consumption and low in operating cost; and the production system of high-purity hydrogen disclosed by the invention is high in degree of automation, less in catalyst consumption, less in species, less in operators, good in operating environment, low in operating cost and remarkable in energy saving and consumption reducing effect.

The invention relates to a Ni-based catalyst for continuous hydrogenation of a DCPD fixed bed and a hydrogenating method for DCPD continuous hydrogenation to synthesize endo-tetrahydrodicyclopentadiene (endo-THDCPD), overcoming the problems of complex operation, low synthetic efficiency, rapid catalyst deactivation and difficulty in separation of the catalyst and a product for the existing intermittent synthetic reaction. The Ni-based catalyst is prepared from the following components by weight percentage: 5%-40% of NiO, 1-15% of CuO, 0.2%-5% of basic metallic oxide, 0.2%-5% of transition metallic oxide and the balance of a carrier gamma-Al2O3. The catalyst is prepared from a soluble salt solution of reactive metal and auxiliary metal by an impregnation method, and is subjected to drying, calcination and reduction for continuous hydrogenation reaction of a DCPD fixed bed. The Ni-based catalyst is prepared by a co-impregnation method, and also can be prepared by a substep impregnation method, the required reduction temperature is low, the reaction condition is mild, the one-step hydrogenation activity is high, the yield and the selectivity of the endo-THDCPD are high and the activity stability is good.

The invention discloses a preparation method of 2,5-dimethylfuran and relates to 2,5-dimethylfuran. A furan aldehyde compound serving as a substrate is added into an organic solvent to prepare a reaction substrate solution; the reaction substrate solution, anhydrous formic acid and a non-precious-metal catalyst are mixed and put into a reaction kettle, nitrogen gas is used for replacing dischargedair, heating and stirring are conducted for hydrodeoxygenation, and 2,5-dimethylfuran is obtained. The prepared supported non-precious-metal Ni-Cu/SBA-15 serves as a catalyst, formic acid serves as ahydrogen donor, and the furan aldehyde compound is subjected to catalytic transfer hydrogenation to synthesize DMF. The whole process is simple and easy to operate, the cost is low, the reaction system is green, the catalyst is high in activity, the selectivity of DMF is high, the yield is high, and the method has a wide industrial application prospect. Direct use of H2 is avoided, formic acid isused as a hydrogen source, 2,5-dimethylfuran is convenient to store and use, the requirement of a reaction solvent for the hydrogen solubility is reduced, the hydrogenation effect is good, the synthesis method is simple, the method is easy to operate, and energy consumption is low.

The invention discloses an SCR (Selective Catalytic Reduction) catalyst containing synthetic zeolite and iron, and particularly relates to an SCR catalyst which always has an NOx purifying property in a low-temperature region after being subjected to relatively long-term action of hot water and relatively long-term action of sulfur oxides. A preparation method of the SCR catalyst, disclosed by the invention, comprises the following steps: crystallizing a hydrogenised synthetic zeolite with maximal oxygen cycle number of 8-12 and a three-dimensional structure by using a mixing procedure, and blending with a ferric nitrate (III) water solution or ferric chloride (III) water solution with a pH value of 0.1-0.7 to obtain the SCR catalyst without a filtering procedure and a cleaning procedure.

The invention discloses a copper-iron based catalyst in the technical field of catalyst preparation and application thereof in preparing low mixed alcohols by catalyzing synthesis gas. According to the invention, a copper-magnesium-iron hydrotalcite precursor is prepared by a nucleation-crystallization isolating method, and then the copper-magnesium-iron hydrotalcite precursor is roasted and then subjected to reduction treatment to obtain the copper-iron based catalyst of highly dispersed nanoparticles. The catalyst has the characteristics that the catalytic active ingredients are highly dispersed, the catalytic active ingredients have strong interaction with one another, and are high in stability, and as a result, the activity and selectivity of the catalyst are improved. After the copper-iron based catalyst is applied to preparing low mixed alcohols from the synthesis gas, the CO conversion rate is high, and the selectivity and space time yield of the low mixed alcohols are also improved; besides, the conversion rate of CO for synthesizing low mixed alcohols through CO hydrogenation is 56.89% and the selectivity of alcohols is 49.07%.

The invention discloses a catalyst for methane synthesis through carbon dioxide hydrogenation and a preparation method of the catalyst for methane synthesis through carbon dioxide hydrogenation. The catalyst for methane synthesis through carbon dioxide hydrogenation is a composite oxide Eu2O3-Co3O4-ZrO2, wherein the molar ratio of Co and Zr is 4:6, and the quantity of rare earth element Eu is 1-10% of the molar total quantity of Co and Zr. The preparation method comprises the following steps of: adopting citric acid as fuel, and preparing the composite oxide Eu2O3-Co3O4-ZrO2 through a combustion method. The obtained composite oxide Eu2O3-Co3O4-ZrO2 is used for catalyzing carbon dioxide hydrogenation to synthesize methane and shows a good catalytic performance. The preparation method has the characteristics that the process is simple and quick, the environmental-friendly chemical concept can be conformed, and the industrial production can be easily realized.

The invention relates to a method which adopts a palladium membrane to produce high-purity hydrogen from hydrogen-containing synthetic gas and a device. In the method, synthetic gas which contains water vapor and hydrogen and is produced by an upstream hydrogen making reactor is firstly sent to a cooler, the cooled synthetic gas enters a gas-liquid separator, after dehydration, the synthetic gas enters a primary heater and is heated in the heater, the heated synthetic gas enters a secondary heater and heated to the temperature of 450-600 DEG C, the heated synthetic gas enters a palladium membrane separator, and most of hydrogen in the synthetic gas permeates the palladium membrane separator to become the high-purity finished hydrogen. A pipeline of the device which connects a heat exchanger and the palladium membrane separator is sequentially provided with the gas-liquid separator, the primary heater and the secondary heater, the palladium membrane separator is connected with a burner by the primary heater, and the burner is also connected with the secondary heater. The invention has simple design and high hydrogen separation efficiency of the palladium membrane and provides a new technical method for efficient production of high-purity hydrogen.