309 results about "Steam reforming" patented technology

The invention discloses a method for performing tar steam reforming by coupling low-temperature plasma with a nickel-loaded hydrogen type molecular sieve composite catalyst. The method comprises the following steps: preparing the nickel-loaded hydrogen type molecular sieve composite catalyst; the mass of Ni in the nickel-loaded hydrogen type molecular sieve composite catalyst accounts for 5-30% of the mass of the catalyst; introducing tar and water vapor into a dielectric barrier discharge plasma reactor filled with the nickel-loaded hydrogen type molecular sieve composite catalyst; starting the dielectric barrier discharge plasma reactor, and carrying out a tar steam reforming reaction; wherein the temperature of the tar steam reforming reaction is 150-525 DEG C, and the power of the tar steam reforming reaction is 30-90 W. The catalyst disclosed by the invention is coupled with a low-temperature plasma technology, so that good tar reforming performance, target product selectivity and system stability are realized.

The invention relates to the technical field of hydrogen production catalysts, in particular to a preparation method of a supported methanol steam reforming hydrogen production catalyst. Comprising the following steps: S1, dissolving copper salt, adding indium oxide, heating in a water bath to evaporate water, drying, and carbonizing to obtain a Cu / In2O3 catalyst; s2, adding the Cu / In2O3 catalyst and tris (hydroxymethyl) aminomethane into water, then adding dopamine hydrochloride for reaction, and performing centrifugal washing and drying to obtain a precipitate; and S3, grinding and carbonizing the precipitate to obtain the nitrogen-doped carbon modified Cu / In2O3 catalyst. After the surface of the Cu / In2O3 catalyst is modified by carbon, strong electron interaction exists between carbon and metal copper, metal Cu electrons are promoted to be transferred to nitrogen-doped carbon, and the formed Cu < + > species enhance the catalytic activity for catalyzing methanol steam reforming hydrogen production and the selectivity for hydrogen.

The invention belongs to the technical field of fuel cells, and particularly relates to a high-temperature methanol reforming fuel cell system for realizing carbon cycle and an operation process. The system comprises an electric pile, a methanol steam reforming hydrogen production reactor, a carbon dioxide hydrogenation methanol production reactor and an electrolyzed water module, hydrogen prepared by the methanol steam reforming hydrogen production reactor enters an anode of the galvanic pile through a pipeline, a cathode of the galvanic pile is supplied by an air pump, and the hydrogen and oxygen are subjected to electrochemical reaction in the galvanic pile to realize external power supply; liquid water recovered from the electric pile tail gas is introduced into the water electrolysis module, and water electrolysis is performed to generate hydrogen; carbon dioxide in the stack tail gas and hydrogen generated by the water electrolysis module enter the carbon dioxide hydrogenation methanol preparation reactor through the gas inlet pipeline to prepare methanol. According to the invention, the circulation of carbon in the high-temperature methanol fuel cell system is realized, the emission of carbon dioxide is reduced, the circulation of hydrogen and oxygen is realized, and the energy utilization efficiency of the system is jointly improved through the circulation of carbon, hydrogen and oxygen.

The invention discloses a high-thermal-conductivity core-shell copper-zinc-aluminum catalyst, a preparation method thereof and application of the high-thermal-conductivity core-shell copper-zinc-aluminum catalyst in a methanol reforming hydrogen production reaction. Aiming at the strong heat absorption characteristic of a methanol reforming hydrogen production reaction, a coprecipitation method is utilized to prepare a copper-zinc-aluminum catalyst with a heat conduction agent as a core and copper, zinc oxide and aluminum oxide nanoparticles as a shell, so that a metal salt is subjected to in-situ precipitation reaction on the surface of the heat conduction agent, and micro mixing of the copper, zinc oxide and other nanoparticles and the heat conduction agent is realized; compared with other heat conduction agent adding modes such as particle mixing and tabletting mixing, the catalyst shows a stronger catalytic effect in a strong endothermic reaction such as a methanol steam reforming hydrogen production reaction, and the optimal catalyst conversion rate reaches 51.1% under the conditions that the reaction temperature is 230 DEG C and the WHSV is equal to 24 h <-1 >.

The application discloses a preformed methane reforming catalyst and a preparation method thereof. The catalyst comprises a nickel-active alumina first functional component, a cerium oxide nanocluster second functional component and an alumina inert phase. The preparation method comprises preforming an inert phase pretreatment, hydrothermal treatment, calcination and reduction. The preformed inert phase after pretreatment is used as a carrier, which greatly improves the catalyst strength, pertinently weakens the metal-carrier interaction, avoids bed layer temperature drop and carbon deposition caused by local high strength reaction, and improves the operation stability. The first functional component with a layered structure and the second functional component rich in oxygen vacancies further improve the catalyst activity and stability, and the performance indicators are overall superior to those of the existing catalyst products. The preparation method is simple and easy to implement, has no special requirements on equipment, and is conducive to the popularization and application in the fields of methane steam reforming and methane dry reforming.

A process for the production of hydrogen is described comprising the steps of: (i) subjecting a gaseous mixture comprising a hydrocarbon and steam to steam reforming in a reforming unit comprising an autothermal reformer to generate a reformed gas mixture; (ii) increasing the hydrogen content of the reformed gas mixture by subjecting it to one or more water-gas shift stages in a water-gas shift unit to provide a hydrogen-enriched reformed gas; (iii) passing the hydrogen-enriched reformed gas and an oxygen-rich gas to an oxidation unit containing an oxidation catalyst that converts carbon monoxide present in the hydrogen-enriched reformed gas to carbon dioxide, to form a carbon dioxide-enriched gas mixture; and (iv) passing the carbon dioxide-enriched gas mixture to a product separation unit to provide a hydrogen gas stream, a carbon dioxide gas stream and a by-product gas stream, wherein at least a portion of the by-product gas stream is compressed and recycled to one or more of the reforming unit, the water-gas-shift unit, the oxidation unit, and the product separation unit.

The invention discloses a fuel cell-turbofan engine hybrid power system for a cross-medium aircraft, and relates to the technical field of aero-engines, the system comprises a solid oxide fuel cell, a turbofan engine, a lithium battery, an energy management module, a motor, a propeller, a reforming hydrogen production device and a medium self-adaptive oxidant supply subsystem. In an air flight mode, the system adopts autothermal reforming hydrogen production, a fuel cell and a turbofan engine to cooperatively work, a high-efficiency low-oil-consumption low-speed cruise and high-thrust acceleration mode is provided, and meanwhile, a lithium battery is charged. In the underwater submerging and water surface sailing mode, a turbofan engine flow channel is closed, steam reforming hydrogen production is adopted, a hybrid power system composed of a fuel cell and a lithium battery is used for driving a propeller, the fuel cell provides stable power, and the lithium battery meets the instantaneous high-power requirement. The system solves the problems that a traditional power system is low in efficiency, poor in cruising ability, single in working mode and the like.

The invention discloses a noble metal-based catalyst as well as a preparation method and application thereof, and belongs to the technical field of methanol steam reforming hydrogen production and catalysts. The noble metal-based catalyst comprises a carrier, an auxiliary agent metal and an active metal, the carrier comprises CeO2, and the shape of the carrier is in a rod shape; the active metal comprises Pt; the auxiliary agent metal comprises In2O3; the active sites of the noble metal-based catalyst comprise Pt < 2 + > and Pt < delta + >, the Pt < 2 + > is higher than 85%, and the Pt < delta + > is lower than 15%. According to the invention, the ratio of CO in the product is effectively reduced.

The invention relates to the technical field of hydrogen production, in particular to a method for producing hydrogen by catalyzing methanol steam reforming at a low temperature. The method comprises the steps of raw material preparation, vaporization and preheating, reforming reaction, product post-treatment and the like, the used Pt-Co / N-C catalyst is prepared by taking graphene oxide, aniline, ferric nitrate and the like as raw materials through polymerization, pyrolysis, hydrochloric acid treatment and metal load reduction, a nitrogen-doped carbon carrier and Pt-Co alloy active components are contained, and wrapped Fe3C is retained. The low-temperature high-efficiency hydrogen production is realized, CO generation is inhibited, the catalyst stability is high, the process energy consumption is low, the integration degree is high, and the device is suitable for a distributed hydrogen energy supply scene.

The present invention provides a method for hydrogen production from coke oven gas based on the electrochemical reduction of CO2 technology. The method includes gas pretreatment, multi-stage membrane separation, catalytic reaction, and electrocatalytic reduction. Particulates, tar, and moisture are removed through cyclone separation and activated carbon adsorption, and MDEA and zinc oxide desulfurization are combined to ensure gas purification; a multi-stage membrane separation technology is used to achieve the separation of high-purity hydrogen. Through high-temperature and low-temperature water gas shift and methane steam reforming reactions, CH4 and CO are efficiently converted to further increase the hydrogen production. The electrocatalytic reduction technology is innovatively adopted to convert CO2 into CO, H2, and HCOOH to achieve carbon resource recycling. The present invention has the characteristics of high efficiency, low consumption, and low carbon, and is applicable to the deep purification and resource utilization of coke oven gas.

The invention provides a composite catalyst for hydrogen production by steam reforming of light components of bio-oil as well as a preparation method and application of the composite catalyst. According to the invention, the chemical properties are optimized by regulating and controlling the adding proportion of the metal ions, so that the optimal interaction between the composite spinel and the auxiliary metal is obtained. The formation of the composite spinel oxide enriches the oxide species of the assistant metal and the number of oxygen vacancies on the surface of the catalyst, due to the appearance of a large number of assistant metal species, coke is quickly gasified through dissociation of water, and the gasified reducing gas is beneficial to self-reduction of the assistant metal, so that the catalytic activity of the catalyst is improved. According to the present invention, the efficient conversion and the lasting stability of the catalyst are achieved, the same good catalysis effect on the bio-oil light component is provided, and the problems of easy carbon deposition, easy deactivation, gas methanation and the like of the catalyst during the steam reforming are substantially alleviated.

The invention belongs to the technical field of methanol hydrogen production, and discloses a process for catalytic heating coupling methanol hydrogen production. The process comprises the following steps: S1, providing a methanol cracking hydrogen production system; and S2, carrying out methanol steam reforming hydrogen production treatment based on a methanol cracking hydrogen production system. And S3, carrying out pressure swing adsorption treatment on the methanol decomposition gas prepared in S2 to obtain desorbed gas and purified hydrogen. S4, purified hydrogen flows through a product gas buffer tank with a filter element and then is fed into a gas using section. And S5, feeding the desorbed gas into a catalytic oxidation reactor for recovery treatment, and supplying released heat energy to a methanol cracking hydrogen production system for use. According to the invention, the organic combination of catalytic oxidation and methanol cracking hydrogen production is realized, the problems that the existing methanol hydrogen production process needs to discharge combustible tail gas and is unsafe and not environment-friendly are solved, extra fuel is not needed in the whole hydrogen production process, and only methanol needs to be provided; the method has the remarkable advantage of zero consumption of natural gas, diesel oil, coal and other fuels.

The invention relates to an energy optimization system for natural gas hydrogen production, compressed air energy storage and air direct carbon capture coupling, which comprises a natural gas steam reforming system, an outlet of a water supply preheater is connected with an inlet of a steam generator, and an outlet of the steam generator is connected with an inlet of a reaction gas preheater; an outlet of the reaction gas preheater is connected with an inlet of the reforming reactor, an outlet of the reforming reactor is connected with an inlet of the water vapor generator, and an outlet of the water supply preheater is connected with an inlet of the hydrogen pressure swing adsorption bed; according to the flue gas carbon capture system, an inlet of a flue gas cooler is connected with an outlet of a water vapor generator, and an outlet of the flue gas cooler is connected with an inlet of a flue gas carbon dioxide separation device; according to the compressed air energy storage and air direct carbon capture coupling system, an outlet of a compressed air cooler is connected with an inlet of a carbon dioxide pressure swing adsorption device, and an outlet of the compressed air cooler is connected with an inlet of a reaction gas preheater.

A process for the production of hydrogen comprises: a first steam reforming step of a feedstock containing hydrocarbons to obtain a first synthesis gas; a first synthesis gas shift and cooling step on the first synthesis gas; a separation step for separating the first synthesis gas into a high concentration hydrogen stream and a tail gas stream; a second low pressure steam reforming step performed on the tail gas to obtain a second synthesis gas; a second synthesis gas shift and cooling step on the second synthesis gas; a CO2 removal step performed on the stream of hydrogen and carbon dioxide exiting the second synthesis gas shift and cooling step in order to separate a CO2 stream from a fuel grade hydrogen stream; a step of feeding at least a part of the fuel grade hydrogen stream to the first steam reforming step.

The application discloses a preparation method and application of a low-Cu-loading high-activity methanol reforming hydrogen production catalyst. The catalyst takes Al2O3 as a carrier, Cu as an active component, and Ce as an additive, is synthesized by a coprecipitation method in one step, and realizes the synergistic effect of the active metal, the additive and the carrier by precisely controlling the Cu loading to be 5-15%, the Ce doping amount to be 1-5%, and combining specific precipitation, calcination and reduction processes; the dispersion degree and the low-temperature catalytic performance of Cu are improved by using the redox electron regulation formed by CeO2 and Al2O3 and the strong metal carrier interaction. Without doping of noble metals, the raw material cost is reduced, meanwhile, the catalyst has excellent mechanical strength, the long-period reaction performance does not attenuate for 300 hours, is suitable for a fixed-bed reforming reactor, can be efficiently applied to a methanol steam reforming hydrogen production reaction, and has remarkable industrial application value.

The application relates to the technical field of catalyst preparation, and discloses a copper-based catalyst for hydrogen production by methanol steam reforming and a preparation method thereof, which is prepared by adopting a precipitation method-ball milling method with multiple precursors of copper, zinc, aluminum, titanium and lanthanum as raw materials, specifically, metal salts including copper and zinc are dissolved to obtain A liquid; an alkali solution is prepared to obtain B liquid; in a solvent system, an aluminum precursor and a lanthanum salt are heated and dried to obtain a modified alumina carrier; A liquid and B liquid are blended and reacted, and after the reaction, the modified alumina carrier is added and aged to obtain a precursor; and the precursor and a titanium source are ball milled and then calcined to obtain the catalyst. The copper-based catalyst obtained by the application has excellent methanol low-temperature conversion activity, hydrogen yield and high-temperature resistance.

The present invention relates to a control method for controlling a reformer temperature, the method comprising the steps of: dividing a flow of reformer gas (22) into a flow of reformer feed gas (24) and a flow of reformer bypass gas (26) by means of a reformer gas flow divider (28); directing the flow of reformer feed gas (24) through a high-temperature valve (30) and a reformer (20) for steam reforming; directing the flow of reformer bypass gas (26) through an oxidation catalyst (40) for purifying exhaust gases, wherein the passage of the flow of reformer feed gas (24) through the high-temperature valve (30) and the reformer (20) is controlled by means of the high-temperature valve (30) in order to thereby control the reformer temperature.

An apparatus for steam reforming includes a reactor, a condensate separator, a condensate stripper, and a steam boiler. The reactor produces hydrogen and is connected to the condensate separator such that a gas mixture is conducted from the reactor into the condensate separator. The condensate separator and the condensate stripper are connected so that condensate separated out in the condensate separator is conducted into the condensate stripper. The condensate separator and the steam boiler are connected such that cleaned condensate can be conducted into the steam boiler. The steam boiler is connected to the reactor and to the condensate stripper in a steam-conducting manner. The boiler water feed line of the steam boiler is connectable to the condensate stripper in a liquid-conducting manner. A supply from the boiler water feed line is at a same location of the condensate stripper as a supply of the condensate from the condensate separator.

To provide a method for producing a synthetic resin (X) which can reduce loads on environments when producing the synthetic resin (X).SOLUTION: A method for producing a synthetic resin (X) includes a step of reacting a first raw material (A) synthesized in a step of reacting carbon dioxide with hydrogen, with a second raw material (B) which is synthesized from the carbon dioxide and is different from the first raw material (A). At least one of carbon dioxide for synthesizing the first raw material (A) and carbon dioxide for synthesizing the second raw material (B) contains at least one selected from the group consisting of carbon dioxide which is discharged to the environments and is generated by combustion of an organic matter, carbon dioxide generated by water vapor modification of the organic matter, and carbon dioxide taken out of volcanic gas in geothermal power generation.SELECTED DRAWING: Figure 1

A process for steam reforming a hydrocarbon feedstock containing one or more nitrogen compounds, including passing a mixture of the hydrocarbon feedstock and steam through a catalyst bed of one or more nickel steam reforming catalysts disposed within a plurality of externally heated tubes in a tubular steam reformer, each tube having an inlet to which the mixture of hydrocarbon and steam is fed, an outlet from which a reformed gas containing hydrogen, carbon monoxide, carbon dioxide, steam, ammonia and methane is recovered. The steam reforming catalyst at least at the outlet of the tubes comprises nickel dispersed over a porous metal oxide surface present as a coating on a non-porous metal or ceramic structure The nickel content of the metal oxide coating is in the range of 5 to 50% by weight and the thickness of the coating is in the range of 5 to 150 micrometres.

The application discloses a biomass fermentation process for preparing green methanol, which comprises the following steps: providing a biomass raw material, and fermenting to obtain biogas; obtaining rich-methane gas after crude purification of the biogas; obtaining qualified rich-methane gas after super-precision detoxification of the rich-methane gas; adding medium-pressure steam into the qualified rich-methane gas, and performing a methane steam reforming reaction to obtain a mixed gas; performing PSA treatment on the mixed gas to obtain a resolved gas and a raw material gas; and feeding the resolved gas into a normal-temperature catalytic heat exchange system, and taking the raw material gas as one of raw materials for methanol synthesis to prepare refined methanol. The application realizes full-chain coupling and efficient utilization, combines biomass fermentation, biogas purification and methane steam reforming, and adopts a CO2 circulation technology. The application realizes full-process energy integration: the waste heat in the fermentation process, the waste heat of the PSA resolved gas and the waste water of rectification are utilized to drive the methane steam reforming reaction, the system energy consumption is reduced, and the economic efficiency and sustainability of the system are further improved.

A method can be employed to regulate and stably operate a steam reforming system that is operated by steam reforming, that has a capacity utilization level that can be regulated, and that comprises a steam reformer, a hydrogenating and desulfurizing unit that is positioned upstream of the steam reformer and is configured for feedstock desulfurization, and a firing unit of the steam reformer. According to the method, a mandated capacity utilization level for the steam reforming system is established with automated regulation of the following continuously monitored parameter ratios: a hydrogen-to-feedstock ratio in the hydrogenating and desulfurizing unit, a steam-to-carbon ratio in the steam reformer, and a fuel-to-air ratio in the firing unit of the steam reformer.

The invention relates to the field of ethanol reforming catalysts, and discloses an ethanol steam reforming hydrogen production catalyst and a preparation method and application thereof. The catalyst comprises an active metal element Ni and a carrier CeO2, and based on the metal element, Ni accounts for 10-20wt% of the mass of the catalyst. The catalyst provided by the invention has the advantages of carbon deposition resistance, sintering resistance, high temperature resistance and good activity, selectivity and stability. The preparation method of the catalyst provided by the invention has the advantages of convenience in operation, low synthesis temperature, safety and economy.

The application discloses a foamed copper low-temperature methanol water vapor reforming hydrogen catalyst and a preparation method thereof, and belongs to the technical field.The technical scheme is as follows: including pretreatment, chemical plating reaction, impregnation, pre-copper plating, copper electroplating, calcination, hydrothermal reaction and high-temperature treatment.The foamed copper catalyst prepared by the application has the advantages of more uniform dispersion of active components, higher porosity and better stability;Al does not need to be added, and the active component is the carrier;and the preparation process is simple, convenient to operate, low in cost and obvious in industrial application value.

The invention belongs to the technical field of cracking conversion reaction catalysts, and discloses a high-temperature raw gas direct cracking conversion catalyst and a preparation method thereof. The catalyst comprises a main active component, a co-catalytic component, a capacity expanding agent and an adhesive, raw materials of the main active component comprise industrial waste residues and natural ore; the industrial waste residue is pyrite oxidation roasting slag and / or steel slag, and the natural ore is at least one of dolomite ash, olivine and zeolite; the co-catalysis component comprises a first co-catalysis component and a second co-catalysis component; the first co-catalysis component is an oxide of a group VI B element and / or an oxide of a group VIII element; and the second co-catalysis component is an oxide of a group II A element and / or an oxide of a lanthanide element. The catalyst disclosed by the invention not only has high sulfur resistance, but also has the advantages of high stability, high temperature resistance, good catalytic activity and the like, and a multi-path reaction system of steam reforming, partial oxidation, catalytic cracking and numerous balanced reactions is constructed.

The present disclosure provides systems and methods for hydrogen production as well as apparatuses useful in such systems and methods. Hydrogen is produced by steam reforming of a hydrocarbon in a gas heated reformer that is heated using one or more streams comprising combustion products of a fuel in an oxidant, preferably in the presence of a carbon dioxide circulating stream.

The present disclosure provides an ammonia production plant comprising an ammonia converter system comprising one or more catalytic beds, wherein an ammonia synthesis gas comprises hydrogen and nitrogen is converted into a product stream; a first high-pressure steam generator downstream of the ammonia converter system, a first heat exchanger, downstream of the high-pressure steam generator, configured for exchanging heat between the product stream and the ammonia synthesis gas, wherein the ammonia production plant further comprises a medium-pressure steam generator, configured to generate medium pressure steam using heat recovered from the product stream and / or from the ammonia synthesis gas, particularly wherein the medium-pressure steam generator is located downstream of the high-pressure steam generator and wherein the plant comprises a medium-pressure steam network and / or a steam consuming unit, wherein the steam outlet of the medium-pressure steam generator is fluidly connected to the medium-pressure steam network and / or to the steam-consuming unit, particularly wherein the steam-consuming unit is a steam reforming unit or process condensate stripping unit in a hydrogen production system of the ammonia production plant. The present disclosure further provides a method to revamp an existing ammonia production plant into an ammonia production plant according to the present disclosure, and to a method for operating an ammonia production plant.

The present application relates to a kind of CoFe-LDHs / VMT composite catalyst and its preparation method, belong to electrocatalysis field.The CoFe-LDHs / VMT composite material prepared by the present application can efficiently catalyze the preparation of hydrogen and nitrogen by cracking urea, which provides a train of thought for the industrialization of hydrogen and nitrogen prepared by urea electrolysis.Compared with traditional methane steam reforming to prepare hydrogen and water electrolysis to prepare hydrogen, the energy consumption is low, and the polluting urea is converted into non-polluting hydrogen for human use, which solves the problem of environmental pollution and energy crisis.

The present invention provides a multi-sized Ni-based catalyst, a preparation method thereof, and an application. The present invention utilizes lanthanum nitrate, nickel nitrate, and citric acid to prepare a Ni@Ni-La2O2CO3 catalyst by instantaneously expanding and annealing a precursor in an argon atmosphere to dope Ni single atoms and Ni particles into La2O2CO3. Using the catalyst prepared by the present invention, hydrogen can be efficiently produced by photocatalytic steam reforming of bioethanol; it shows the high efficiency and sustainability of the Ni@Ni-La2O2CO3 catalyst composed of Ni single atoms and Ni particles doped into La2O2CO3. The preparation method of the Ni-based catalyst provided by the present invention, in which Ni single atoms and Ni particles coexist, has the advantages of low preparation temperature, pertinence, simplicity, simple equipment, and environmental friendliness, providing a new approach for the application of chemical substances with complex compositions in fields such as photocatalytic driving. NP @Ni SA -La2O2CO3 catalyst. NP @Ni SA -La2O2CO3 catalyst.

Disclosed is a method for producing hydrocarbons, the method comprising the steps of: S1) thermally decomposing a mixed waste to produce a first mixed gas; S2) steam-reforming the first mixed gas, removed of impurities, in a first fluidized bed reactor to produce a second mixed gas; S3) separating the second mixed gas into a first stream containing carbon dioxide and a second stream containing hydrogen and carbon monoxide; S4) introducing the first stream, separated in step S3), into a second fluidized bed reactor and converting the first stream into carbon monoxide through a reverse Boudouard reaction; S5) mixing the second stream and the carbon monoxide, converted in step S4), to produce a third mixed gas, and producing a synthesis gas (Syngas) through a water-gas conversion reaction using the third mixed gas; and S6) producing hydrocarbons from the synthetic gas through a catalytic reaction.