34results about How to "High conversion rate of methane" patented technology

A process and catalyst for use therein for the production of aromatics via the oxidative coupling of methane and methane co-aromatization with higher hydrocarbons in a single reaction stage. First, methane is partially converted to ethane and ethylene on an OCM catalyst component, and the OCM intermediate mixture containing methane, ethane and ethylene is subsequently converted into aromatics on an aromatization catalyst component. The reaction may be conducted at 550-850° C. and at about 50 psig. The claimed process and catalyst used therein achieves high methane conversion at lower temperatures (less than 800° C.), higher methane conversion into the aromatic products and significant reductions in production cost when compared to the traditional two (or more) step processes.

The invention provides an oxygen carrier for chemical looping dry gas reforming, and a preparation method and application of the oxygen carrier. The oxygen carrier is a composite metal oxide adopting a hexaaluminate structure, and has the general formula of AMxAl(12-x)O19, wherein A is rare earth metal lanthanum and / or barium, M is transition metal Fe, and x is greater than 0 or smaller than 5. The temperature of the oxygen carrier in a fuel reactor is 750-1000 DEG C, and the temperature of the oxygen carrier in an oxidation reactor is 750-1000 DEG C, and both of the reaction pressures are normal pressure. The preparation method comprises the following steps: using iron nitrate, aluminum nitrate, lanthanum nitrate and / or barium nitrate as a precursor to prepare a nitrate solution; adding ammonium carbonate as a precipitant for coprecipitation; performing suction filtration, washing, drying and roasting to obtain the oxygen carrier. The oxygen carrier has the advantages of being larger in oxygen-carrying rate, higher in reactivity, excellent in shock-resistant mechanical property and high temperature stability, environmental-friendly, low in cost and easy to prepare.

The invention relates to the technical field of catalysts for obtaining synthetic gas through carbon dioxide reforming of methane, and discloses a nickel-based catalyst for obtaining the synthetic gas through the carbon dioxide reforming of the methane and a preparation method for the nickel-based catalyst. The nickel-based catalyst for obtaining the synthetic gas through the carbon dioxide reforming of the methane consists of NiO, MgO and gamma-Al2O3. The preparation method comprises the following steps of: 1, preparing a mixed solution; and 2, preparing the nickel-based catalyst. Compared with the prior art, the method has the advantages that: the methane conversion rate of the nickel-based catalyst is greatly improved, the service life is also greatly prolonged, and the carbon deposition rate is greatly reduced; and the nickel-based catalyst is low in cost and has better economy.

This invention provides a catalyst for removing hydrocarbons from a combustion gas containing methane and containing an excess of oxygen, which comprises iridium supported on zirconium oxide; and a method of removing hydrocarbons from a combustion gas containing methane and containing an excess of oxygen, which comprises using this catalyst.

A method and apparatus for converting a hydrocarbon and oxygen containing gas feed stream to a product stream, such as syngas, including catalytically partially oxidizing the hydrocarbon feed stream over a catalyst bed. The catalyst bed has a downstream zone which is less resistant to flow than the upstream zone.

A method and apparatus for converting a hydrocarbon and oxygen containing gas feed stream to a product stream, such as syngas, including catalytically partially oxidizing the hydrocarbon feed stream over a catalyst bed. The catalyst bed has a downstream zone which is less resistant to flow than the upstream zone.

The invention discloses a method for preparing methyl alcohol, formaldehyde and CO used for methane direct selective oxidation. The method comprises the following steps: preparing a BN powder materialcatalyst, after mixing boric acid with urea, dissolving and stirring with a water and methyl alcohol mixed solvent, carrying out thermostatic waterbath standing for crystallization, and roasting under an inert atmosphere to obtain a BN powder material; tabletting and forming a roasted sample, smashing and sieving to obtain a BN powder material catalyst; catalyst activation: introducing oxygen-containing gas into a continuous flow reactor filled with the BN powder material catalyst for heating, activating, introducing inert gas, adjusting to a reaction temperature, and switching into a reaction gas; and preparing methyl alcohol, formaldehyde and CO.

A system for converting carbon dioxide into a fuel to be re-burned in an industrial process. The preferred feed stocks are taken from large volume carbon dioxide producers, and municipal waste. The reaction and processes reclaim lost energy in municipal waste, and industrial exhaust gas. The system is provided with a plasma melter having a feedstock input for receiving a feed fuel, and a syngas output for producing a syngas having an H2 component. Additionally, a Sabatier reactor is provided having a hydrogen input for receiving at least a portion of the H2 component produced by the plasma melter, and a methane output for producing CH4. The process has a large negative carbon footprint.

A metal oxide-supported nickel catalyst includes a matrix containing a metal oxide and catalytic sites distributed throughout the matrix and having an intricate interface with the matrix, in which the catalytic sites are selected from the group consisting of nano-nickel(0) domains and nano-nickel(0)-A(0) alloy domains. Also disclosed are a method for preparing this catalyst and a method for using it to produce carbon monoxide and hydrogen by partial oxidation of a C1-C5 hydrocarbon.

The invention relates to the technical field of catalysts for obtaining synthesis gas by reforming methane and carbon dioxide, and relates to a nickel-based catalyst for obtaining synthesis gas by reforming methane and carbon dioxide and a preparation method thereof; the nickel-based catalyst for obtaining synthesis gas by reforming methane and carbon dioxide consists of NiO, MgO and γ-Al2O3; the preparation method is carried out according to the following steps: the first step of preparing a mixed solution and the second step of preparation. The positive effects of the present invention are: compared with the prior art, the methane conversion rate of the nickel-based catalyst obtained in the present invention has been greatly improved, the service life has also been greatly improved, and the carbon deposition rate has been greatly reduced. The cost of the present invention Low, better economy.

An apparatus and method to desulfurize a biogas containing sulfur. Since biogas is produced by an anaerobic digester from human, animal, kitchen and agriculture's wastes, it is a short term recycled product from the photosynthesis of CO2, and has a net zero carbon emission. The sulfur compounds in the biogas can be removed by the following steps: (1) converting all sulfur compounds into H2S by the hydrogen produced from the biogas over Pt group metal catalysts; (2) adsorbing the H2S at high temperature by the regenerable Pt group metal catalyst and adsorbents. The desulfurized biogas is further converted by an ATR / CPO reformer or a steam generating reformer to produce various reformates.

The invention discloses a synthesis method for a gamma-aluminium oxide nanometer material. The synthesis method comprises the following steps: at room temperature, adding alum and carbamide into deionized water, cooling, centrifugating and washing the sediment after the hydrothermal reaction; calcining the dried hydrothermal products to obtain the gamma-aluminium oxide nanometer material. The gamma-aluminium oxide nanometer material prepared by adopting the synthesis method has a relatively high specific surface area and a certain pore structure. The invention further provides a method for prepare a nickel / gamma-aluminium oxide catalyst by adopting the gamma-aluminium oxide nanometer material obtained by adopting the synthesis method as the raw material. The method comprises the following steps: impregnating the gamma-aluminium oxide nanometer material into a nickel salt solution in the appropriate concentration, carrying out magnetic stirring till the solvent evaporates; collecting the dried impregnating products and grinding into powders, and carrying out heating reduction in the reducing atmosphere to obtain the nickel / gamma-aluminium oxide catalyst. The catalyst can be used for catalyzing the methane dry-process reforming reaction, has a relatively high methane conversion rate, and can still maintain excellent stability and carbon formation resistance in the long-term catalytic reaction under high temperature.

The present invention relates to a kind of preparation method of methane oxidative coupling ethylene solid acid catalyst, the method comprises the following steps: (1) TiO 2 Fully grind to 6000~7000 mesh, add it to the tungsten salt solution, impregnate with ultrasonic, stir and evaporate to dryness in a water bath to obtain the tungsten-titanium solid acid precursor; the tungsten-titanium solid acid precursor is roasted and ground into powder to obtain WO 3 Solid acid WO with a content of 5 wt%~15 wt% 3 / TiO 2 Carrier; (2) Add LiNO sequentially in ionized water 3 , Mn(NO 3 ) 2 , and make it completely dissolved, and then impregnate the solid acid WO with excess impregnation method 3 / TiO 2 carrier to obtain impregnation; (3) stirring and evaporating the impregnation in a water bath, grinding it into powder and roasting to obtain a solid acid catalyst. The preparation method of the invention is simple, the preparation conditions are mild, and the three industrial wastes are less, and the obtained catalyst has the advantages of good performance, long service life and the like.

An oxygen carrier for dry gas reforming in chemical circulation and its preparation method and application, the oxygen carrier is a composite metal oxide with a hexaaluminate structure, the general formula is AMxAl12‑xO19, wherein A is rare earth metal lanthanum and / or barium, M is transition metal iron, 0<x<5. The temperature of the oxygen carrier in the fuel reactor is 750-1000 DEG C, the temperature in the oxidation reactor is 750-1000 DEG C, and the reaction pressure is normal pressure. The preparation process is: using ferric nitrate, aluminum nitrate, lanthanum nitrate and / or barium nitrate as precursors, preparing nitrate solution, adding ammonium carbonate as precipitant for co-precipitation, and then suction filtration, washing, drying and roasting. have to. The oxygen carrier has high oxygen loading rate and reactivity, and has the advantages of excellent impact resistance mechanical properties, high temperature stability, environmental friendliness, low cost and easy preparation.

The invention relates to an oxygen carrier for methane to prepare synthesis gas. The oxygen carrier is characterized by comprising Fe2O3, CeO2 and Al2O3, wherein the mass ratio of CeO2 to the sum of Fe2O3 and Al2O3 is 0.05 to 0.4; the mass ratio of Fe2O3 to Al2O3 is 0.75 to 1.5. The oxygen carrier has the advantages of high methane conversion rate as well as high CO and H2 selectivity.

The present invention relates to a method for preparing a sulfated metal oxide catalyst for chlorination, and a method for producing a reaction product containing methyl chloride (CH3Cl) by using the sulfated metal oxide catalyst. A sulfated zirconia catalyst and a sulfated tin oxide catalyst are disclosed as the sulfated metal oxide catalyst for chlorination.

The invention discloses a ruthenium dioxide catalyst applied to oxychlorination of methane. The ruthenium dioxide catalyst comprises a carrier, an active component loaded on the carrier, co-catalysiscomponents and a carrier modification additive, wherein the carrier comprises titanium dioxide; the active component is ruthenium dioxide; the co-catalysis components comprise alkali metal componentsand rare-earth metal components; the carrier modification additive is silicon dioxide. The invention also discloses a preparation method of the ruthenium dioxide catalyst. According to the catalyst, through the co-catalysis components including alkali metal components and rare-earth metal components, the dispersibility of ruthenium dioxide as the active component is improved; the active site structure of ruthenium dioxide is changed; the catalyst has two high-activity sites for activating C-H bonds and activating O2; the activation of methane is facilitated; the excessive oxidization of the product is avoided; the catalyst also has high methane conversion rate and monochloro methane selectivity; the catalyst obtained by the preparation method can be directly used for catalyzing oxychlorination reaction of methane without pretreatment.

The invention provides a photocatalytic metal-molecular sieve composite catalyst and a preparation method thereof, and belongs to the technical field of methane catalysis. The catalyst prepared by the method can generate a large quantity of stable monovalent metal cations (Zn+ or Cd+) through ultraviolet radiation, thus the catalyst has extremely high photocatalytic methane conversion activity; and driven by sunlight, the catalyst can efficiently catalyze methane to couple thereby producing ethane and meanwhile generate equimolar hydrogen under normal temperature and normal pressure. Comparedwith the existing methane conversion photocatalyst, the catalyst has the advantages of the highest methane conversion ratio (23.5%), the highest ethane selectivity (99.7%), the minimum photon energy requirement (wavelength is less than 390nm) and the like.