35results about How to "High hydrogen selectivity" patented technology

The invention relates to a synthetic method of a load type molybdenum carbide catalyst, which belongs to the field of catalytic materials and comprises the steps of: dispersing organic-inorganic mixed molybdenum oxide-polyaniline used as precursors in H2O/EtO; drying after mixing with carriers, such as carbon nanotubes and the like; and then roasting at an inert atmosphere to obtain the load typemolybdenum carbide catalyst. In the load process, other metal salts can also be added to modify the molybdenum carbide catalyst to obtain a metal modified load type molybdenum carbide catalyst. The molybdenum carbide catalyst prepared by the invention has the advantages of large external surface area, less surface carbon deposition, abundant catalytic performance of precious metal and the like, and can be used for conveniently modifying the catalyst. The loading molybdenum carbide catalyst has important application in various catalytic reactions.

The present invention belongs to the field of chemical technology, and especially one kind of copper base catalyst with nanometer carbon material as co-catalyst for vapor reformation of methanol to prepare hydrogen and its preparation process. The catalyst is prepared through the process including the steps of: compounding 0.1 M solution of Cu/Zn/Al nitrate; compounding 0.1 M solution of sodium carbonate, dropping the 0.1 M solution of Cu/Zn/Al nitrate and 0.1 M solution of sodium carbonate in the same rate into reactor with nanometer carbon material for co-precipitation under strong stirring and 60 deg.c to obtain carbonate coprecipitate containing nanometer carbon material; washing, drying, roasting, etc. The prepared catalyst has unique porous structure of great specific surface area, high low temperature activity and high hydrogen selectivity, and may be used in preparing reformed product with hydrogen content up to 75 % and CO content lower than 0.1 %.

The present invention discloses one kind of Cu-Zr catalyst for steam reforming of methanol to prepare hydrogen and its preparation process. The catalyst without Zn and Al components contains CuO10-80 mol%, ZrO2 20-90 mol% and MOx 0-20 mol%, where M is one of Ce, La, Fe, Y and Mn. The Cu-Zr catalyst is used for steam reforming of methanol to prepare hydrogen, and has high activity, high hydrogen selectivity and very high stability. Specifically, it has conversion rate in steam reforming of methanol of 90-99 %, hydrogen selectivity of 95-99 % and CO content in the product lower than 0.5 %.

A Cu-base catalyst for preparing hydrogen by water vapour reforming to methanol is composed of the active component (CuO/ZnO/Al2O3 and the silicon oxide-base mesoporous material. Its preparing process includes quantitatively adding mesoporous silicon oxide to reactor, simultaniously dropping the solution of nitrate and the solution of sodium carbonate in the reactor while stirring, depositing reaction, washing, drying and calcining. Its advantages are unique large surface area and porous structure, and high low-temp activity and selectivity.

The invention relates to a preparation method of perovskite-like La2NiO4 catalyst and applications. The method includes the specific steps of: taking the soluble metal salts of La, Ni as raw materials to formulate a soluble metal salt solution with the concentration of 0.1-0.3mol/L; using citric acid with the concentration of 0.1-0.3mol/L as complexing agent; dripping the metal salt solution to the complexing agent according to the mol ratio of La:Ni: citric acid being 2:1:2-2:1:4 and implementing ultrasonic oscillation treatment to form sol; heating and stirring the sol in water bath with the temperature of 60-90 DEG C to be gelated; and drying the gelated sol at the temperature of 90-150 DEG C for 10-30h to form a product precursor; arranging the product precursor in a microwave synthesis furnace; and treating the product precursor at the temperature of 600-1000 DEG C for 30-180min and reducing the obtained product. When the La2NiO4 catalyst prepared by the method is applied to hydrogen production by ethanol vapor reforming, the characteristics of even components and uniform grain diameter are available.

A hydrogen sensor includes a solid electrolyte made of a barium cerium oxide, and a first electrode and a second electrode that are formed on the surface of the solid electrolyte. The first and the second electrodes are made of a material having a catalytic effect with respect to an oxidation reaction of hydrogen and are made of the same material. Thus, the hydrogen sensor can be inexpensive and has good hydrogen selectivity and responsiveness to detection, and thus it is possible to measure hydrogen in a high concentration region.

The present invention relates to a technology for manufacturing a nanocomposite membrane comprising a graphene oxide coating layer with a thickness of 1 nm to 50 nm, which is formed on various supports and has nanopores, and a reduced graphene oxide nanocomposite membrane, and applying the membranes to gas separation. The graphene oxide nanocomposite membrane for gas separation of the present invention has excellent gas permeability and selectivity at the same time, and especially, excellent hydrogen gas permeability and hydrogen gas selectivity compared with carbon dioxide, and the reduced graphene oxide nanocomposite membrane has remarkably enhanced hydrogen gas permeability and hydrogen gas selectivity compared with carbon dioxide, and thus the membranes are applicable as a gas separation membrane in an industrial field involving a hydrogen separation process. Furthermore, a graphene oxide nanocomposite membrane for gas separation can be provided, in which strong binding force between a support and a graphene oxide coating layer is induced by modifying surfaces of various supports and thus the graphene oxide coating layer is not easily delaminated.

The oxidation reforming catalyst to prepare hydrogen from carbinol comprises copper oxide 0.1-10w.t%, and solid solution composed of zinc oxide 5-60w.t% and chrome oxide 3-40%, which can be carried on alumina, zirconia, cerium oxide and other carriers with weight of 100-(Cu+ZnO+Cr2O3)%. The opposite method is coprecipitation or rapid decomposition. The hydrogen making reaction needs condition as temperature 280-400Deg, normal pressure to 2.0MPa, airspeed 1000-5000hr-1, and the mole proportion is water: carbinol=1-3.0:0.1-1.

The invention relates to application of a nickel base skeleton metal catalyst in hydrazine decomposition for hydrogen production. Specifically, a nickel-containing skeleton metal is adopted as the catalyst, under the condition of a 0-100DEG C alkaline assistant, hydrazine or hydrazine aqueous solutions with different concentrations rapidly decompose to obtain hydrogen and nitrogen, and the selectivity of hydrogen is over 99%. With easily available raw materials and simple preparation process, the catalyst involved in the invention has the advantages of high hydrogen production efficiency, few by-products, easy recovery, low cost and the like in hydrazine decomposition for hydrogen production, and has potential application prospects.

The present specification discloses a membrane reactor comprising a reaction region; a permeate region; and a composite membrane disposed at a boundary of the reaction region and the permeate region, wherein the reaction region comprises a bed filled with a catalyst for dehydrogenation reaction, wherein the composite membrane comprises a support layer including a metal with a body-centered-cubic (BCC) crystal structure, and a catalyst layer including a palladium (Pd) or a palladium alloy formed onto the support layer, wherein ammonia (NH₃) is supplied to the reaction region, the ammonia is converted into hydrogen (H₂) by the dehydrogenation reaction in the presence of the catalyst for dehydrogenation reaction, and the hydrogen permeates the composite membrane and is emitted from the membrane reactor through the permeate region.

The invention relates to the technical field of catalysts of a synthesis gas which is obtained through reforming methane and carbon dioxide, and in particular relates to a NiO/gamma-Al2O3 catalyst of a methane and carbon dioxide reforming synthesis gas and a method for preparing the NiO/gamma-Al2O3 catalyst of the methane and carbon dioxide reforming synthesis gas. The NiO/gamma-Al2O3 catalyst of the methane and carbon dioxide reforming synthesis gas is prepared through the following step that: step 1, 8-9 parts of nickel nitrate hexahydrate and 10 parts of gamma-aluminium oxide are respectively weighed by weight. Compared with a conventional method for producing a NiO/gamma-Al2O3 catalyst, the method has a simple and convenient operating process, the NiO/gamma-Al2O3 catalyst which is produced through adopting the method has the characteristics of high methane conversion rate, high hydrogen selectivity and long service life of the catalyst; and moreover, the produced NiO/gamma-Al2O3 catalyst is low in use cost and has good economy.

A rare earth free particulate catalytic cracking catalyst which comprises a zeolite having catalytic cracking ability under catalytic cracking conditions, an acidified silica sol binder, magnesium salt, clay and a matrix material. The catalytic cracking catalyst has a high matrix surface area and is useful in a catalytic cracking process, in particularly, a fluid catalytic cracking process, to provide increased catalytic activity and improved hydrogen and coke selectivity without the need to incorporate rare earth metals.

The invention discloses a method for catalyzing hydrogen production of formic acid by an iridium-immobilized metal organic framework material. According to the method, modifiable NH2-MIL-101 (Al) withstable chemical properties and high specific surface area is taken as a base, an amino group is modified, an amide-type iridium-based complex is introduced into the NH2-MIL-101 (Al), and accordingly,the iridium-immobilized metal organic framework material is obtained. The iridium-immobilized metal organic framework material has excellent performance in catalyzing hydrogen production of a formicacid aqueous solution system. 60mg of catalysts and 5mL of 2M formic acid aqueous solutions are added to a flask for a reaction at 50 DEG C, the conversion rate of the formic acid is 88%, the selectivity of hydrogen is close to 100% (CO (10ppm), and the TOF can reach 332h<-1>. The catalysts are recycled for three times, and the catalytic activity of the catalysts is not obviously lowered.

The invention relates to a preparing method and an application of a LaPrFeNi<x>Co<1-x>O6 double-perovskite catalyst for hydrogen production by bioethanol reforming, and belongs to the technical field of catalysts. The method and the application are characterized in that the method includes steps of 1) preparing a LaPrFeNi<x>Co<1-x>O6 double-perovskite catalyst; 2) the catalyst is used in a fixed-bed reactor; and optimized process conditions of the catalyst in hydrogen production by bioethanol reforming are that the reaction temperature is 395-420 DEG C, the pressure is atmospheric pressure, and the sample injection flux of biomethanol is 0.1-0.16 mL/min. The specific surface area of the LaPrFeNi<x>Co<1-x>O6 is 15.72-18.62 m<2>/g, the average pore size is 8.89-11.76 nm, the ethanol conversion rate is 96.62-98.45%, and hydrogen selectivity is 84.56-87.32%.

The invention relates to a high-activity catalyst used for hydrogen production by dehydrogenation of an organic hydrogen storage compound and reduced in noble metal consumption, and a preparation method thereof. The catalyst comprises Pt, a non-noble metal active component, aluminum oxide and modified metal oxide, wherein the modified metal oxide is titanium oxide and/or zirconium oxide; and the value of eta of the modified metal oxide is less than 0.3, the value of theta of the modified metal oxide is greater than or equal to 5, the value of eta is equal to a ratio of the weight percentage ofa crystalline phase modified metal oxide in a carrier composition to the chemical composition weight percentage of the modified metal oxide in the carrier composition, and the value of theta is equalto a ratio of the weight percentage of the modified metal oxide on the surface of the carrier composition to the chemical composition weight percentage of the modified metal oxide in the carrier composition.. The preparation method comprises the following steps: preparing the carrier composition containing the aluminum oxide and the modified metal oxide, conducting dipping and then performing roasting. The catalyst has high dehydrogenation activity and selectivity under the condition that noble metal consumption is reduced.

The invention relates to a catalyst for hydrogen production by decomposing hydrazine, in particular to a catalyst for hydrogen production by decomposing hydrazine with low temperature and high selectivity and its application. The catalyst uses one or more of metal nickel, palladium, and platinum as the active component, and the porous solid phase as the carrier; the catalyst can realize the highly selective reaction of hydrazine decomposition to produce hydrogen at a reaction temperature of 0-100°C, and is used as a fuel. Used in batteries or other workplaces that require a hydrogen atmosphere.

The invention provides a bimetallic SRE ethanol steam reforming hydrogen production monolithic catalyst and a preparation method thereof. The monolithic catalyst has the advantages of high mechanicalstrength, good catalytic performance, high hydrogen selectivity and high catalytic stability.

The invention discloses a preparation method of a copper-based composite metal catalyst. The copper-based composite metal catalyst is used in a methanol-water reforming hydrogen production technology.Wherein SBA-15 molecular sieve is used as a carrier, ZnO is used as a cocatalyst, CuO is used as a main catalyst, the activated SBA-15 molecular sieve is activated under the action of a surfactant CTAB; CuO-ZnO/SBA-15 with different active component loading capacities is obtained after copper ions and zinc ions are roasted and oxidized at high temperature, and uniform distribution of metal particles represents more contact active sites, so that excellent catalytic activity is shown. The activated SBA-15 has a large number of micropores and mesopores, the increase of the surface area is beneficial to the local heat dissipation of the catalyst and has very good mechanical properties, and a small amount of metal oxide and silicon dioxide in the molecular sieve increase the thermal stabilityof the whole catalyst. In the methanol steam reforming hydrogen production reaction, under the condition of higher reaction temperature, the catalyst shows high hydrogen selectivity, low carbon monoxide selectivity and longer service life.

The invention discloses a Cr-based MOF carbon material catalyst co-doped with loaded nano-palladium particles, preparation of the Cr-based MOF carbon material catalyst and an application of the Cr-based MOF carbon material catalyst in hydrogen production from formic acid. On the basis of NH2-MIL-101 (Cr) which is high in specific surface area and can be modified, a nitrogen and chromium oxide co-doped metal organic framework derived carbon material is obtained in an in-situ pyrolysis mode at the temperature of 550-950 DEG C, then palladium metal is loaded, and the Cr-based MOF carbon material catalyst co-doped and loaded with nano palladium particles is obtained. The obtained catalyst shows excellent hydrogen production in a formic acid/sodium formate catalysis system.

The invention relates to a carrier for an organic compound dehydrogenation catalyst. The carrier comprises aluminum oxide and modified metal oxide, wherein the modified metal oxide is titanium oxide and/or zirconium oxide; the value of eta of the modified metal oxide is less than 0.3, the value of theta of the modified metal oxide is greater than or equal to 5, the value of eta is equal to a ratioof the weight percentage of a crystalline phase modified metal oxide in the carrier to the chemical composition weight percentage of the modified metal oxide in the carrier, and the value of theta isequal to a ratio of the weight percentage of the modified metal oxide on the surface of the carrier to the chemical composition weight percentage of the modified metal oxide in the carrier; and the titanium oxide is calculated in terms of TiO2, and the zirconium oxide is calculated in terms of ZrO2. The carrier of the invention is applicable to a catalyst for preparing hydrogen through dehydrogenation of organic liquid to improve the activity of the catalyst, and can also be applied to catalysts for other reactions.