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

The invention relates to an alcohol liquid phase reforming hydrogen production catalyst, a preparation method and an application method thereof. The alcohol liquid phase reforming hydrogen productioncatalyst is a supported catalyst with a carbon coating layer, and is composed of a carrier, the carbon coating layer, an active metal component and an optional auxiliary agent, wherein the carrier isan inorganic oxide, the active metal component is a VIII group metal component, and the mass fraction of carbon in the carbon coating layer is 0.01%-5% based on the whole catalyst. The catalyst is applied to a liquid-phase reforming hydrogen production process of an alcohol substance, and has the characteristics of high conversion rate of the alcohol substances, high hydrogen selectivity and longservice life.

The invention discloses a monatomic catalyst doped with a rare earth element and used for dehydrogenation of an organic hydrogen storage medium. The catalyst comprises a carrier and active components, wherein the active components comprise Pt, Ru and Rh, the three components are dispersed on the carrier in a monatomic form, and the loading amount of the active components on the carrier is 1-5 wt% in terms of a mass ratio of the active components to the carrier; and the carrier is Al2O3 doped with one or more rare earth metals selected from Ce, La and Y, and the total content of the rare earth metals is not more than 5 wt%. According to the invention, rare earth metal doping is used for realizing modification of the carrier, so the activity of the catalyst for catalyzing the dehydrogenation reaction of the organic hydrogen storage medium is effectively improved, the dehydrogenation reaction of the hydrogen storage medium can be realized at lower temperature and lower pressure, and the purity of hydrogen in a product is improved.

Disclosed herein is a catalyst for aqueous-phase reforming of biomass-derived polyols, which comprises platinum and copper as active metals and a mixture of magnesia and alumina as a support. The catalyst contains a small amount of platinum and, at the same time, has high hydrogen selectivity and low methane selectivity.

The invention relates to a low-carbon hydrocarbon hydrogen production device, in particular to a hydrogen production device through reforming methane by using collaborative drive rotation sliding arc discharge plasma. The device comprises a reactor with a reaction hood and an insulated base. The electrode of the reactor is arranged on the insulated base and is connected with a high-voltage DC power supply. A reactor outlet is arranged on the reaction hood. One end of a mixed gas pipeline is connected with a gas inlet on the external side of the insulated base and the other end of the mixed gas pipeline is connected with an air pump and a methane gas source. The electrode comprises a conical internal electrode and a tubular external electrode, wherein the internal electrode is arranged in the center of the insulated base and the external electrode is arranged around the internal electrode. A spiral gas flow passage is arranged in the insulated base. The invention has the advantages that the effect of hydrogen production through methane reformation can be greatly improved, the methane conversion rate is higher, the hydrogen selectivity is higher, the energy consumption is lower and the methane treatment capacity is larger; and the device is simple, the cost is low and the device is particularly suitable for medium and small scale hydrogen production through methane reformation.

Disclosed herein is a catalyst for aqueous-phase reforming of biomass-derived polyols, which comprises platinum and copper as active metals and a mixture of magnesia and alumina as a support. The catalyst contains a small amount of platinum and, at the same time, has high hydrogen selectivity and low methane selectivity.

The invention discloses a method for preparing a Ni / ZrO2 catalyst. The method comprises the following steps: (1) preparing zirconium salt microemulsion, nickel salt microemulsion and alkaline microemulsion respectively; salt microemulsion, nickel salt microemulsion and alkaline microemulsion are mixed; (3) the system obtained by mixing step (2) is subjected to solid-liquid separation to obtain a solid product, and the solid product is cleaned, dried and roasted to obtain Ni / ZrO2 catalyst. The invention also provides the Ni / ZrO2 catalyst prepared by the method and a method for preparing synthesis gas by autothermal reforming of methane. The preparation method of the Ni / ZrO2 catalyst of the invention has simple process, easy operation and low cost, and the prepared catalyst has excellent catalytic activity and stability in the reaction of methane autothermal reforming to prepare synthesis gas.

The present invention relates to the technical field of catalytic materials. Disclosed are a supported catalyst having a core-shell structure, a preparation method therefor, and an application thereof. The preparation method for the catalyst comprises: co-precipitating an alcoholic solution of a non-noble metal soluble salt and a supporter metal soluble salt under the action of a precipitant, sintering and reducing a precipitate so as to obtain a supported non-noble metal precursor, and then performing replacement reaction and sintering reaction on the supported non-noble metal precursor and a homogeneous solution of noble metal twice so as to obtain a supported catalyst in which a mesoporous metal oxide serves as a supporter, non-noble metal serves as a core and an alloy of the non-noble metal and the noble metal serves as a shell. The catalyst of the present invention forms a supported core-shell structure, an alloy of thin non-noble metal and noble metal serving as a shell. Thus, the usage of noble metal can be significantly reduced, the production cost of the catalyst is reduced, and in a catalytic decomposition hydrogen production process of a hydrazine hydrate, the catalyst has good catalysis efficiency and hydrogen production selectivity.

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 the application of a nickel-based skeleton metal catalyst in the preparation of hydrogen by decomposing hydrazine. Specifically, nickel-containing framework metals are used as catalysts to rapidly decompose hydrazine or hydrazine aqueous solutions of different concentrations to obtain hydrogen and nitrogen under the condition of 0-100°C basic additives, and the selectivity of hydrogen exceeds 99%. The catalyst raw material of the invention is easy to obtain, the preparation process is simple, and the invention has the advantages of high hydrogen production efficiency, few by-products, easy recovery of the catalyst, low cost and the like, and has potential application prospects.

The invention relates to a recyclable perovskite type Ni-based composite oxide catalyst and a preparation method thereof.The catalyst takes perovskite type composite oxide ANIO3 with Ni as a B site as a catalytic active component, and the catalyst is easy to dissolve in water and resistant to high temperature (the melting point gt; a halogen metal salt MX at the temperature of 750 DEG C is used as a carrier; by taking the mass of the MX carrier as a reference, the mass loading amount of the ANiO3 active component is the mass loading amount of the ANiO3 active component, and the preparation method is a dipping blending firing method, so that the process is simple. The catalyst is suitable for hydrogen production through reforming of volatile organic compounds (VOCs) and hydrogen production through secondary reforming of gasified products such as coal, biomass and other waste organic matters. Compared with the existing reforming hydrogen production catalyst, the catalyst disclosed by the invention not only breaks through the technical bottleneck that high-quality activity is difficult to obtain due to low specific surface area, but also has the advantages of high hydrogen production selectivity, low reaction temperature, low cost, recyclability and the like, and has a wide application prospect.