Three way catalyst having an NH.sub.3-SCR activity, an ammonia oxidation activity and an adsorption capacity for volatile vanadium and tungsten compounds volatilized off an upstream SCR active catalyst.

A method for preparing a ruthenium catalyst, including a step of reducing a ruthenium catalyst precursor by holding the ruthenium catalyst precursor in an aqueous solution containing a metal salt at a temperature within the range of more than 180 C. and 220 C. or less and a hydrogen partial pressure within the range of 0.6 MPa or more and 5 MPa or less. A method for producing a cycloolefin, including a step of preparing a ruthenium catalyst by the method including a step of reducing a ruthenium catalyst precursor in an aqueous solution containing a metal salt by holding the ruthenium catalyst precursor at a temperature within the range of more than 180 C. and 220 C. or less and a hydrogen partial pressure within the range of 0.6 MPa or more and 5 MPa or less, and a step of partially hydrogenating a monocyclic aromatic hydrocarbon by use of the ruthenium catalyst obtained.

Methods, catalysts, and reactor systems for producing in high yield aromatic chemicals and liquid fuels from a mixture of oxygenates comprising di- and polyoxygenates are disclosed. Also disclosed are methods, catalysts, and reactor systems for producing aromatic chemicals and liquid fuels from oxygenated hydrocarbons such as carbohydrates, sugars, sugar alcohols, sugar degradation products, and the like; and methods, catalysts, and reactor systems for producing the mixture of oxygenates from oxygenated hydrocarbons such as carbohydrates, sugars, sugar alcohols, sugar degradation products, and the like. The disclosed catalysts for preparing the mixture of oxygenates comprise a Group VIII metal and a crystalline alumina support.

A continuous process for aerobic oxidation of methane. The process includes a reactor (10) comprising a bed of a metal-based catalyst (16), a methane feed stream (30) into the reactor (10), an oxygen feed stream (30) into the reactor (10), and a water feed stream (12) into the reactor (10). The methane is oxidised in a single step in the reactor (10) over the metal-based catalyst (16) in the presence of liquid water to produce a reaction product including compounds selected from formaldehyde, oligomers of formaldehyde, methanediol, and products of addition reactions between methanol and formaldehyde, and mixtures thereof.

The present invention provides an additive composition having the general formula: A.sub.xB.sub.yC(.sub.1-y)D.sub.zO.sub.m wherein: A is one or more metal elements selected from the group consisting of Group IIA of the periodic table; B, C is one or more metal elements selected from the lanthanide group, series of the periodic table or Yttrium; D is one or more metal elements selected from the group consisting of Manganese, Cobalt, Copper, Nickel or Ruthenium; x is a number defined by 0.5<x<4; y is a number defined by 0<=y<=1; z is a number defined by 2<z<6; m is a number which renders the catalyst substantially neutral. The present invention also provides a process for preparing the afore-mentioned additive composition. The present invention further provides mixed metal oxide catalysts comprising additive composition and its use in hydrocarbon conversion processes.

A poison-resistant catalytic converter includes a washcoat having a support material comprised of titania and/or silica and a plurality of platinum group metal particles disposed in the support material. The washcoat is disposed on a substrate having a plurality of cells that define respective apertures. The catalytic converter is resistant to poisoning from sulfur and phosphorous compounds while operating at low temperatures. Applications include spark ignited internal combustion engines in combined heat and power systems, vehicles, combustion turbines, boilers and other applications for utilities, industry and vehicle emissions control.

The present invention relates to a process for conversion of a hydrocarbon feed comprising saturated hydrocarbon compounds to olefin products comprising contacting a hydrocarbon feed stream with a catalyst in an oxidic form of the formula M1M2M3M4O comprising metals M1, M2, M3 and M4, wherein: M1 is selected from Si, Al, Zr, and mixtures thereof; M2 is selected from Pt, Cr, and mixtures thereof; M3 is selected from W, Mo, Re, and mixtures thereof; and M4 is selected from Sn, K, Y, Yb and mixtures thereof; wherein: mass fraction of M1 is in the range of 0.1 to 0.8; mass fraction of M2 is in the range of 0.001 to 0.2; mass fraction of M3 is in the range of 0.001 to 0.2; mass fraction of M4 is in the range of 0.0001 to 0.2; and mass fraction of oxygen is in the range of 0.1 to 0.8.

A method of operating a polyethylene reactor system includes feeding ethylene, an optional first comonomer, a diluent, and a chromium-based catalyst to a first polymerization reactor. The method further includes contacting ethylene and the comonomer with the catalyst in the first polymerization reactor to form a first product including a first polyethylene. The method further includes feeding the first product from the first polymerization reactor to a second polymerization reactor. The method further includes contacting ethylene and a second optional comonomer with catalyst from the first reactor in the second polymerization reactor to form a second product including the first polyethylene and a second polyethylene. The method further includes controlling one or both of a molecular weight or a breadth of molecular weight distribution of the second product by adjusting a rate of hydrogen fed to one or both of the first polymerization reactor or the second polymerization reactor.

A novel catalyst composition and its use in the dehydrogenation of alkanes to olefins. The catalyst comprises a Group VIII noble metal and a metal selected from the group consisting of manganese, vanadium, chromium, titanium, and combinations thereof, on a support. The Group VIII noble metal can be platinum, palladium, osmium, rhodium, rubidium, iridium, and combinations thereof. The support can be silicon dioxide, titanium dioxide, aluminum oxide, silica-alumina, cerium dioxide, zirconium dioxide, magnesium oxide, metal modified silica, silica-pillared clays, silica-pillared micas, metal oxide modified silica-pillared mica, silica-pillared tetrasilicic mica, silica-pillared taeniolite, zeolite, molecular sieve, and combinations thereof. The catalyst composition is an active and selective catalyst for the catalytic dehydrogenation of alkanes to olefins.

An improved catalyst for hydrodemetallization of heavy crude oils and residua is disclosed. The catalyst is adopted for fixed bed hydroprocessing units. The invention is characterized for having a large pore diameter catalyst principally for hydrodemetallization of heavy oil and residue in a first reactor of a multi-reactor process. The catalyst has high demetallizing activity and high metal deposition capacity which results in good stability with time on stream (TOS). The hydrorefining catalyst is obtained by kneading a porous starting powder principally composed of gamma-alumina and having a pore capacity of 0.3-0.6 ml/g or larger and a mean pore diameter of 10 to 26 nm, extrudating and calcining, and after that supported with active metals component of elements belonging to groups VIIIB and VIB of the periodic table.