359 results about "Oxidative coupling of methane" patented technology

Metal oxide catalysts comprising various dopants are provided. The catalysts are useful as heterogenous catalysts in a variety of catalytic reactions, for example, the oxidative coupling of methane to C2 hydrocarbons such as ethane and ethylene. Related methods for use and manufacture of the same are also disclosed.

Catalytic forms and formulations are provided. The catalytic forms and formulations are useful in a variety of catalytic reactions, for example, the oxidative coupling of methane. Related methods for use and manufacture of the same are also disclosed.

Systems and methods conducive to the formation of one or more alkene hydrocarbons using a methane source and an oxidant in an oxidative coupling of methane (OCM) reaction are provided. One or more vessels each containing one or more catalyst beds containing one or more catalysts each having similar or differing chemical composition or physical form may be used. The one or more catalyst beds may be operated under a variety of conditions. At least a portion of the catalyst beds may be operated under substantially adiabatic conditions. At least a portion of the catalyst beds may be operated under substantially isothermal conditions.

Nanowires useful as heterogeneous catalysts are provided. The nanowire catalysts are prepared by polymer templated methods and are useful in a variety of catalytic reactions, for example, the oxidative coupling of methane to ethane and/or ethylene. Related methods for use and manufacture of the same are also disclosed.

Metal oxide catalysts comprising various dopants are provided. The catalysts are useful as heterogenous catalysts in a variety of catalytic reactions, for example, the oxidative coupling of methane to C2 hydrocarbons such as ethane and ethylene. Related methods for use and manufacture of the same are also disclosed.

Heterogeneous catalysts with optional dopants are provided. The catalysts are useful in a variety of catalytic reactions, for example, the oxidative coupling of methane to C₂₊ hydrocarbons. Related methods for use and manufacture of the same are also disclosed.

The present invention discloses a catalyst for methane oxidative coupling polymerization to prepare ethylene under the condition of pressurization, and said catalyst uses SiO2 as support, and its active component is formed from Mn2O3, Na2WO4 and SnO2, and its active component content is 10 wt%-20 wt%. Under the condition of no dilution gas, 0.6 MPa and high space velocity it can obtain 33.0% of methane conversion rate and 24.1% of C2 hydrocarbon yield.

Catalysts and catalytic methods are provided. The catalysts and methods are useful in a variety of catalytic reactions, for example, the oxidative coupling of methane.

The present invention discloses a manganese-sodium-tungsten-silicon composite oxide oxidative coupling of methane catalyst containing or not containing titanium, obtained by loading manganese-sodium-tungsten onto a titanium-silicon molecular sieve or a pure silicon molecular sieve by means of a step-by-step impregnation method and calcination. The manganese-sodium-tungsten-silicon composite oxide catalyst containing or not containing titanium has the following structural formula: vMnO2·xNa2O·yWO3·zTiO2·(100-v-x-y-z)SiO2, the v, x, y, and z respectively representing the fractional quality occupied by metal manganese oxide, sodium oxide, tungsten oxide and titanium oxide, 0.3≤v≤16, 0.1≤x≤5, 0.6≤y≤21, 0.0≤z≤4. The manganese-sodium-tungsten-silicon composite oxide catalyst containing or not containing titanium set forth in the present invention is used for oxidative coupling of methane reactions, having excellent low-temperature catalytic activity and ethylene/propylene selectivity generation and reaction stability.

A metal oxide catalyst capable of catalyzing an oxidative coupling of methane reaction is described. The metal oxide catalyst includes a lanthanum (La) cerium (Ce) metal oxide and further including a lanthanum hydroxide (La(OH)₃) crystalline phase. The catalyst is capable of catalyzing the production of C₂+ hydrocarbons from methane and oxygen. Methods and systems of using the metal oxide catalyst to produce C₂+ hydrocarbons from a reactant gas are also described.

A method for producing ethylbenzene (EB) comprising introducing to an oxidative coupling of methane (OCM) reactor an OCM reactant mixture comprising CH₄ and O₂; allowing the OCM reactant mixture to react via OCM reaction to form an OCM product mixture comprising C₂H₄, C₂H₆, water, CO, CO₂ and unreacted methane; separating the water and optionally CO and/or CO₂ from the OCM product mixture to yield an EB reactant mixture comprising C₂H₄, C₂H₆, unreacted methane, and optionally CO and/or CO₂; (d) introducing benzene and an EB reactant mixture to an EB reactor; allowing benzene to react in a liquid phase with the ethylene of the EB reactant mixture to form EB; recovering from the EB reactor an EB product mixture comprising EB and unreacted benzene, and an unreacted alkanes mixture comprising C₂H₆ and unreacted methane, and optionally CO and/or CO₂; and optionally recycling the unreacted alkanes mixture to the OCM reactor.

A method for producing olefins and synthesis gas comprising (a) introducing a reactant mixture to a reactor, wherein the reactant mixture comprises methane (CH₄) and oxygen (O₂), wherein the reactor is characterized by a reaction temperature of from about 700° C. to about 1,100° C.; (b) allowing at least a portion of the reactant mixture to react via an oxidative coupling of CH₄ reaction to form a product mixture, wherein the product mixture comprises primary products and unreacted methane, wherein the primary products comprise C₂₊ hydrocarbons and synthesis gas, wherein the C₂₊ hydrocarbons comprise olefins, and wherein a selectivity to primary products is from about 70% to about 99%; and (c) recovering at least a portion of the product mixture from the reactor.

The invention discloses a bimetal nanometer catalyst used for preparing dimethyl oxalate through CO gas-phase oxidative coupling as well as preparation and an application method of the bimetal nanometer catalyst, and belongs to the technical field of preparation of the dimethyl oxalate. The bimetal nanometer catalyst is characterized in that a catalyst carrier is Alpha-aluminium oxide, an active component is Pd-Cu nanometer grains, the average size of the grain is 2-3nm, the Pd content of the active component is 0.01-2% and Cu content is 0.01-0.04% according to the mass of the catalyst carrier. The catalyst is prepared through a room temperature normal position load method, the preparation method is simple, the energy dissipation is low, the catalyst is suitable for industrial production, the active component Pd-Cu nanometer grains in the catalyst has high dispersity, large specific surface area, small size and uniformity in distribution; the catalyst provided by the invention adopts the Pd-Cu bimetal nanometer grains as the active component, and a bimetal component synergistic effect and a nanometer effect are utilized to reduce the content of the noble metal PD to 0.1% under the premise of keeping the high activity and stability of the catalyst, therefore and the cost of the catalyst is greatly reduced, and the partial substitution of the noble metal is realized.

The invention belongs to the oxalic ester preparation technical field, and provides a nano Pd catalyst used for preparing oxalic ester by CO gas phase oxidation coupling in coal glycol, its preparation method and its purpose. According to the invention, the catalyst takes alpha-alumina as a carrier, precious metal Pd nano particles are taken as an active component, by referring the weight of the catalyst carrier, the weight percentage content of the active ingredient Pd is 0.05-2%. The catalyst is prepared by using a nano metal in-situ loading method. The preparation method has the advantages of simple process and low energy consumption, and enables accurate regulation and control on the size and bare crystal face of the Pd nano particles. The catalyst with the bare crystal face of (lll) surface has the advantages of high Pd dispersiveness of active components, small size and narrow distribution, and can catalyze CO gas phase oxidation coupling to oxalic ester with high efficiency under low precious metal load capacity.

A process for producing olefins comprising introducing to a reactor a reactant mixture comprising methane, oxygen, and water, wherein the reactor comprises a catalyst, and wherein water is present in the reactant mixture from 0.5 mol % to 20 mol %; allowing the reactant mixture to contact the catalyst and react via an OCM reaction to form a product mixture comprising C₂₊ hydrocarbons, unreacted methane, and byproducts; wherein C₂₊ hydrocarbons comprise olefins and paraffins; and wherein the process is characterized by a productivity, a C₂₊ selectivity, or both that is increased when compared to a productivity, a C₂₊ selectivity, or both, respectively, of an otherwise similar process conducted (i) with a reactant mixture comprising methane and oxygen and (ii) without water present in the reactant mixture from 0.5 mol % to 20 mol %; recovering the product mixture from the reactor; recovering C₂₊ hydrocarbons from the product mixture; and recovering olefins from C₂₊ hydrocarbons.