33results about How to "High conversion rate of methane" patented technology

The invention provides a methane reforming system.In the system, a methane and vapor pipeline passes through a hydrogen separation device and a carbon dioxide separation device in sequence in a circulating mode, hydrogen and carbon dioxide generated from wet reformation of methane are separated alternately to promote methane reformation reaction equilibrium to move to the forward direction, and then methane conversion rate is increased greatly compared with a one-time reaction conversion rate under the non-circulating condition.Besides, a heat exchanger is additionally arranged between the hydrogen separation device and the carbon dioxide device to recover lost heat generated by difference in operation temperatures of the hydrogen separation device and the carbon dioxide separation device, so that the energy utilization rate of the system is increased.

A catalyst for synthetic gas preparation through partial natural gas oxidation, whose percentage by weight is nickel oxide 6-25%, rare-earth oxide 0-6%, silicon carbide 69-94%, they catalyst is prepared through the steps of, dissolving soluble metallic nickel salt or the mixture of metallic nickel salt and rare-earth metal salt into distilled water or ethanol solvent, immersing the silicon carbide with high specific surface area into the solution, wherein metal salt is deposited on the carbonization silicon face, and catalyst is obtained through roasting.

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.

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.

A method of treating a methane residue in a gas mixture at a temperature lying in the range 200° C. to 500° C. and including at least methane at a concentration lying in the range 50 ppm to 2500 ppm and oxygen at a concentration lying in the range 0.5% to 12% by volume. According to the invention, the methane residue is treated by a plasma having energy density lying in the range 15 J/L to 100 J/L generated in a plasma reactor by applying a high voltage electrical signal between an internal electrode and an external electrode of the plasma reactor, the external electrode being cylindrical in shape and surrounding the internal electrode, and at least one of the electrodes being covered in a dielectric material to create a dielectric barrier discharge in the gas mixture and convert part of the methane residue into carbon monoxide.

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.

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 catalyst for preparation of synthetic gas through catalytic partial oxidation of methane. According to the invention, inorganic refractory oxide is used as a carrier, and crystalline nickel cobalt vanadium oxide is used as an active component; in terms of the weight of the catalyst, the active component accounts for 1 to 50%, preferably, 10 to 30%; the molar composition of the crystalline nickel cobalt vanadium oxide is represented by NixCoyVzOdelta, wherein x is equal to 0 to 1.0, y is equal to 0 to 1.0, z is equal to 0.1 to 1.0, x+y is less than 0, and delta refers to a value when O in the oxide reaches an equilibrium amount. A preparation method for the catalyst used for preparation of synthetic gas through catalytic partial oxidation of methane comprises the following steps: respectively dissolving nitrates of Ni and Co and an oxyacid ammonium salt of V to prepare aqueous solutions; mixing the catalyst carrier or a carrier precursor with the aqueous solutions; adjusting a pH value to 3 to 12, preferably, 5 to 10; carrying out a coprecipitation reaction under the condition of stirring; and carrying out moisture removal, drying and roasting so as to obtain the loaded crystalline nickel cobalt vanadium oxide catalyst. The catalyst has the advantages of good comprehensive performance, high dispersion of the active component, high catalytic activity, excellent carbon deposit resistance, high stability and low cost.

The invention discloses a method for preparing vinylidene fluoride by a reaction of trifluoromethane and methane under the action of a composite catalyst, wherein the composite catalyst comprises a component 1 and a component 2, the component 1 comprises a lanthanum-based metal, and the component 2 comprises an IIA group metal. The method provided by the invention has the characteristics of high vinylidene fluoride selectivity, high methane conversion rate, low reaction temperature and the like.

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 belongs to the technical field of catalysts. The invention provides a composite catalyst with a hollow core-shell structure. The composite catalyst is prepared from CaO, Ca3Al2O6, Ni and SiO2, in the composite catalyst, the molar ratio of Ca to Al to Ni to Si is 1: (0.01-0.5): (0.01-0.15): (0.01-0.15). The invention also provides a preparation method of the composite catalyst with the hollow core-shell structure. The composite catalyst with the hollow core-shell structure has catalysis and adsorption properties, the repeated volume expansion and shrinkage process of adsorption components in the reaction-regeneration cycle process is carried out in a SiO2 cavity, collapse of the structure of the composite catalyst cannot be caused, and the stability of the composite catalyst is improved; the methane conversion rate and the H2 concentration can be obviously improved.