Abstract: Olefins are converted into other olefins having different numbers of carbon atoms by contact with a catalyst produced by combining a metal, such as tungsten or a tungsten compound, with a halosilane by adding either water or silica to the suspension of metal and halosilane and then heating to activate the catalyst.

Abstract: A supported tungsten oxide or supported molybdenum oxide is treated with elemental tungsten, silicon or antimony. The composition is useful as a metathesis catalyst.

Abstract: Metals, nitrogen and/or sulfur, particularly vanadium, nickel and nitrogen, are removed from organic compositions, particularly heavy hydrocarbon oils, by contacting the organic compositions with a halogenating agent, preferably phosphorus oxychloride, under conditions sufficient to form a distinct phase including the contaminants, which is separable from the organic composition and separating the distinct phase from the organic composition as by filtration, decantation, and the like. In another embodiment of the present invention, the treatment with the halogenating agent is carried out in conjunction with treatment with an acid gas and water, as a combination of carbon dioxide and water, or a solvent.

Abstract: Olefins are converted into other olefins having different numbers of carbon atoms by contact with a catalyst produced by contacting an inorganic refractory oxide support containing rhenium oxide with a promoting amount of at least one aluminum alkyl and, optionally, at least one tin alkyl compound under conditions suitable for aluminum and tin alkyl compounds to promote the activity of the rhenium oxide for the disproportionation reaction.

Abstract: 1. Normally solid polypropylene, consisting essentially of recurring propylene units, having a substantial crystalline polypropylene content.

Abstract: Solid polymers of olefins having at least three carbon atoms per molecule and methods of making such polymers with a chromium-containing catalyst or organometal catalyst system.

Abstract: High octane gasoline is produced from cat cracked gasoline by cleaving the C.sub.5 olefins in the gasoline with ethylene in a first disproportionation zone. The effluent is separated to produce a C.sub.5.sup.+ stream, a first butenes stream and an ethylene-propylene stream. The ethylene-propylene stream is passed to a second disproportionation or cleavage zone along with additional propylene supplied from an external source. The effluent is separated to produce ethylene which is passed to the first disproportionation zone and a second stream of butenes. The butenes stream are combined and passed to an alkylation zone where it is alkylated with isobutane. The alkylate and remaining gasoline (C.sub.5.sup.+ stream) can be combined to produce a product higher in octane value than cat cracked gasoline.

Abstract: A composition active for the conversion of olefins comprising magnesium oxide and an olefin disproportionation catalyst in admixture.

Abstract: A composition active for the conversion of olefins comprising magnesium oxide and an olefin disproportionation catalyst in admixture.