Exxon Chemical Patents, Inc.

Other

Rhodia Chimie

Thierry Hamaide

Frank J Chen

Alain M Guyot

Christophe Le Deore

Roger Spitz

John D Ou

Karine Tortosa

Christelle Delaite

Ven Pinjala

The invention relates to a composition based on a grafted metal oxide, its preparation and its use in a process of polymerization by opening oxygenated rings such as alkyl oxides, cyclic esters or cyclic carbonates. The composition comprises a support chosen from the group of metal oxides capable of containing hydroxyl functions, onto which is grafted a group of formula (1) &mdash;M(OR),in which M is an element chosen from scandium, zirconium, hafnium, niobium, tantalum, rare-earth metals and actinides, R is an organic group and n is an integer greater than or equal to 1. The composition is prepared by forming a suspension of the abovementioned support and then placing in contact and reacting this suspension with a compound of formula (2) M(OR),in which M, R and n are defined as above.

Process of polymerization by opening oxygenated rings, using a catalytic composition based on a grafted metal oxide

A supported Lewis acid catalyst system for catalyzing hydrocarbon conversion reactions including cationic polymerization, alkylation, isomerization and cracking reactions is disclosed, wherein the catalyst system comprises an inorganic oxide support having immobilized thereon a least one strong Lewis acid comprising at least one metal salt of a strong Bronsted acid wherein the metal is selected from the group consisting of aluminum, boron gallium, antimony, tantalum, niobium, yttrium, cobalt, nickel, iron, tin, zinc, magnesium barium strontium, calcium, tungsten, molybdenum and the metals of the lanthanide series and wherein the strong Bronsted acid is selected from the group consisting of mineral and organic acids stronger than 100% sulfuric acid.

Supported Lewis acid catalysts derived from superacids useful for

Supported lewis acid catalysts derived from superacids useful for

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Vienne, France

Thierry Hamaide