207 results about "Steam reforming" patented technology

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 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 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.

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 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 invention relates to a process for producing hydrogen by reforming hydrocarbons with steam, and separating carbon dioxide. The process comprises an endothermic reforming step and an autothermal reforming step for producing a synthesis gas stream, wherein the heat produced in the autothermal reforming step is used for heating in the endothermic reforming step. The process further comprises a step of converting the obtained synthesis gas stream to enrich hydrogen, a step of separating the thus produced hydrogen by pressure swing adsorption, and a step of separating carbon dioxide from the residual gas obtained from the pressure swing adsorption. The reforming units for the endothermic reforming step and the autothermal reforming step are arranged in parallel to each other or in series.

The invention discloses a Stirling engine pure oxygen combustion system and method, and the Stirling engine pure oxygen combustion system comprises a Stirling engine body which is used for converting heat energy into mechanical energy; the reformer is connected with the exhaust hole of the Stirling engine body through a waste heat recovery pipeline, so that diesel oil in the reformer can be subjected to steam reforming through exhaust waste heat; the metal monolithic catalytic system is a monolithic catalyst which takes FeCrAl honeycomb as a matrix and is arranged in the reformer; the direct blowing type swirl nozzle is connected with the Stirling engine body and the reformer and is used for mixing and combusting diesel oil, reformed gas and pure oxygen; and the ejector is connected with the Stirling engine body and the direct blowing type swirl nozzle and is used for adjusting the flue gas recirculation proportion. According to the system, through the coupling design of fuel reforming and pure oxygen combustion, deep utilization of exhaust waste heat is achieved, and the combustion efficiency and the efficiency of an external combustion system are improved.

This invention discloses a photothermal catalyst based on Ni supported on porous carbon derived from tea residue and its application in hydrogen production from waste natural biomass. The catalyst preparation method includes tea residue raw material pretreatment, preparation of tea residue-derived carbon materials, KOH chemical activation, acid washing and water washing followed by drying, then impregnation and loading with a nickel precursor, and finally reduction in a hydrogen atmosphere to obtain the catalyst. This catalyst can catalyze the biomass steam reforming hydrogen production reaction under focused sunlight irradiation. This invention organically couples the resource utilization of tea residue solid waste with the solar photothermal-driven biomass reforming hydrogen production process, achieving synergistic effects of high-value utilization of agricultural and forestry waste and clean solar hydrogen production. The process is simple, the raw materials are readily available, and it is environmentally friendly, possessing good prospects for industrial application.

To provide a fuel cell system that can perform sufficient steam reforming even when using reforming water containing carbon dioxide. [Solution] The fuel cell system comprises a fuel cell 1, a fuel processing unit 2 that generates a hydrogen-containing fuel gas supplied to the fuel cell 1 by steam reforming, a reforming water storage unit 4 that stores water to be used as reforming water for steam reforming, a reforming water supply unit 5 that supplies the reforming water to the fuel processing unit 2, a recovered water recovery unit 6 that recovers water contained in the exhaust gas discharged from the fuel processing unit 2 as recovered water and supplies the recovered water to the reforming water storage unit 4 as reforming water, and a control unit C. The reforming water supply unit 5 has an adjustment mechanism that adjusts the flow rate of the reforming water flowing through the reforming water supply passage 51, and the control unit C calculates an estimated value of the carbon dioxide concentration in the reforming water based on temperature information related to the water as reforming water, and controls the adjustment mechanism based on the estimated value.

The invention provides a method for preparing methane through pyrolysis of medical waste and application of the method, and relates to the technical field of medical waste treatment and energy recovery, and the method comprises the following steps: pyrolyzing the medical waste to obtain pyrolysis gas, purifying the pyrolysis gas, then carrying out steam reforming reaction to obtain reacted gas, separating and purifying the reacted gas to obtain the methane. Methane is obtained; during pyrolysis, the temperature is increased to 190 DEG C to 210 DEG C and kept for 8 min to 12 min, then the temperature is increased to 390 DEG C to 410 DEG C and kept for 13 min to 17 min, and then the temperature is increased to 540 DEG C to 560 DEG C and kept for 30 min to 40 min; the steam reforming reaction catalyst is a lanthanum modified nickel-based catalyst. According to the method, the technical effects of destroying pathogens in the medical wastes, cracking macromolecular organic matters, improving the methane yield and purity and reducing the treatment cost are achieved, and harmless, resourceful and efficient treatment of the medical wastes is realized.

The invention provides a methanol steam reforming hydrogen production supported composite catalyst and a preparation method thereof, and relates to the technical field of hydrogen production catalysts. The preparation method adopts a fractional precipitation method and comprises the following steps: uniformly precipitating a first component to form an initial matrix with good dispersity; then a second component precursor solution is slowly dropwise added, and the second component is guided to be uniformly separated out on the surface or in pores of the initial matrix, so that the local enrichment phenomenon caused by too high precipitation rate is effectively avoided; according to the preparation method provided by the invention, directional optimization of carrier functions and accurate compatibility of active components can be realized through step-by-step operation; the composite catalyst prepared by the preparation method shows excellent activity and stability, the catalytic performance of the composite catalyst is always maintained at a high level in a continuous operation process, an obvious attenuation phenomenon does not occur, and the composite catalyst has a wide application prospect.

The utility model provides a bypass pressure regulating device for preventing overpressure of an outlet of a water pump. The bypass pressure regulating device is applied to a methane steam reforming hydrogen production system. The methane steam reforming hydrogen production system comprises a reactor, a gas-liquid separator and a subsequent purification process, and the reactor is communicated with the subsequent purification process through the gas-liquid separator; the gas-liquid separator is further connected with a water replenishing system, the water replenishing system comprises a water replenishing pump, a water replenishing inlet pipe, a water replenishing outlet pipe and a switch valve, and the inlet end of the water replenishing pump is communicated with the water replenishing inlet pipe. The bypass pipeline is additionally arranged in front of and behind the make-up pump, and the bypass pressure regulating device is arranged on the bypass pipeline, so that when the switch valve fails and does not react, or the switch valve and the make-up pump are not synchronous in starting and stopping actions, the pressure at the make-up water outlet pipe is increased, and the bypass pipeline is opened by the bypass pressure regulating device; liquid in the water replenishing outlet pipe can flow back into the water replenishing inlet pipe through the bypass pipeline and the bypass adjusting device, and overpressure of an outlet of the water replenishing pump can be effectively prevented.

A steam reforming reactor may comprise a shell, an inner tube disposed within the shell such that an annular portion is formed between the shell and the inner tube, a fluid inlet communicating with the annular portion, a fluid outlet communicating with the annular portion, a catalytic reactor system disposed within the annular portion, and at least one internal heating device disposed within the inner tube, wherein the catalytic reactor system may be configured to allow fluid to flow through the annular portion, and the at least one internal heating device may be configured to heat the fluid flowing through the annular portion.

A process for steam reforming of a hydrocarbon feedstock containing one or more nitrogen compounds is described, the process comprising: passing a mixture of the hydrocarbon feedstock and steam through a catalyst bed consisting of one or more nickel steam reforming catalysts placed in a plurality of externally heated tubes in a tubular steam reformer, wherein each tube has an inlet to feed the hydrocarbon and steam mixture and an outlet to recover a reformate gas containing hydrogen, carbon monoxide, carbon dioxide, steam, ammonia and methane, and wherein at least at the outlet of the tube, the steam reforming catalyst is a structured steam reforming catalyst comprising nickel dispersed on the surface of a porous metal oxide present as a coating on a non-porous metal or ceramic structure, wherein the nickel content in the metal oxide coating is in the range of 5 to 50 wt.-% and the thickness of the coating is in the range of 5 to 150 micrometers.

The invention discloses a process method for preparing green hydrogen by coupling biomass flameless pyrolysis gasification with steam reforming, and relates to the technical field of hydrogen energy preparation and organic solid waste recycling, and the process method comprises the following steps: in a high-frequency electromagnetic heating austenite alloy rotary kiln, carbon-containing organic matters are subjected to primary cracking by using a light quantum energy field excited by an alloy; combustible gas and solid carbon residues are mixed; the primary product is introduced into a light quantum reforming reactor, high-temperature superheated steam is introduced into the light quantum reforming reactor, in the reforming reactor, the high-temperature steam is dissociated into active [H] atoms and [OH] free radicals under the action of a light quantum field, the active [H] atoms and the [OH] free radicals are subjected to an efficient roaming chemical reaction with primary combustible gas and solid carbon, and hydrocarbon and carbon are preferentially converted into H2 and CO; finally, the reaction product is subjected to pressure swing adsorption or molecular sieve separation to obtain high-purity hydrogen, energy field precise excitation and chemical reaction cooperation are achieved, and the yield and selectivity of hydrogen are greatly improved.

The invention provides an intelligent power supply system for solid-liquid fuel composite hydrogen production and high and low temperature fuel cell coupling. Comprising an aluminum hydride fuel tank, a methanol steam reforming hydrogen production reactor, a high-temperature proton exchange membrane fuel cell stack and a low-temperature proton exchange membrane fuel cell stack, an outlet of the aluminum hydride fuel tank is connected with an inlet of the high-pressure hydrogen storage bottle through a pipeline; an outlet of the high-pressure hydrogen storage bottle is connected with an anode inlet of the low-temperature proton exchange membrane fuel cell stack through a pressure reducing valve; according to the double-hydrogen-source cooperative coupling mechanism, through reaction characteristic complementation and energy gradient utilization, the inherent limitation of a single hydrogen source in fuel cell application is effectively solved, the traditional system architecture of a single hydrogen source and a single type of fuel cell is broken through, two hydrogen production modes and two electric pile technologies are creatively and deeply fused, and the energy utilization rate of the fuel cell is improved. The comprehensive breakthrough of the system in efficiency, dynamic response, fuel adaptability and reliability is realized.

The invention relates to the technical field of solid oxide fuel cells, in particular to a honeycomb ceramic catalyst for hydrogen production by reforming natural gas water, a preparation method and application. Comprising an ultrahigh-pore-density honeycomb ceramic carrier and a composite active catalytic layer coated on the pore channel wall of the ultrahigh-pore-density honeycomb ceramic carrier, the mesh number of the ultrahigh-pore-density honeycomb ceramic carrier is 10000-40000, and the composite active catalytic layer comprises metal active components, modified aluminum oxide and cerium-zirconium oxide. The catalyst has high catalytic activity by adopting an ultrahigh-pore-density honeycomb ceramic carrier, the utilization rate of active components is improved by a porous structure of the coating, a natural gas water reforming hydrogen production reaction can be quickly started, the hydrogen production efficiency is improved, and the methane conversion rate at 650 DEG C reaches 75% or above.

A catalyst and method for Low Temperature Methane Steam Reforming, LTMSR. The LTMSR catalyst is based on a non-noble metal, an alkaline earth metal and a rare earth metal combination on a support to produce stable and low temperature methane steam reforming catalysts. The catalyst is suitable for steam reforming mixtures of light hydrocarbons, such as those found in natural gas and bio-gas sources. The output may be configured to provide methane and carbon dioxide in a ratio of around 1:1 by number which is suitable for further processing into end products. The process and catalyst may help show an improved long-term performance by suppressing the fast formation of coke that is well-known to deteriorate the activity of other conventional reforming catalysts. This performance is obtained by controlling the composition and crystalline sizes of the active catalyst components on the selected support and by controlling the reaction conditions.