Elf Exploration Production

E.i. Dupont De Nemours and Company

Claude Crouzet

Marc J Ledoux

Jean Nougayrede

Sabine Savin-Poncet

Kostantinos Kourtakis

Cuong Pham-Huu

Andre Philippe

Jan J Lerou

Nicolas Keller

Christophe Bouchy

Cuong Pham Huu

Baudain Heinrich

A catalyst comprising vanadium phosphorus oxide combined with a thermally conductive material is particularly useful for the selective hydrocarbon oxidations (e.g., butane to maleic anhydride) and can be prepared by forming a suspension comprising a vanadium (IV) phosphate compound in a liquid medium (via hydrochloric acid digestion of V O and H PO in an aqueous solvent or via heating vanadium pentoxide with at least one substantially anhydrous unsubstituted alcohol having 1-10 carbon atoms, 1-3 hydroxyl groups free from olefinic double bonds to form a feed of vanadium pentoxide reduced to a valence between 4 and 4.6, and then contacting the feed with a solution of orthophosphoric acid and at least one unsubstituted alcohol), adding a thermally conductive material to the suspension under agitation at moderated temperature between 40&deg; C. and 120&deg; C., followed by drying, optionally but preferably washing and calcining (either in situ or ex situ) the material thus formed.

Vanadium phosphorus oxide catalyst having a thermally conductive support

A process for catalytically oxidizing H S contained in a gas directly to sulphur containing the following steps: combining the H S-containing gas with a gas containing free oxygen in an amount to produce an oxygen-enriched H S-containing gas having O /H S molar ratio ranging from about 0.05 to about 15; and contacting the oxygen-enriched H S-containing gas with a catalyst for selective oxidation of H S to sulphur, wherein the catalyst includes a catalytically active phase combined with a silicon carbide-based support and wherein the active phase of the catalyst consists of at least one oxysulphide of at least one metal selected from the group consisting of iron, copper, nickel, cobalt, chromium, molybdenum and tungsten, at a temperature above the dew point of sulphur formed during H S oxidation.

Process for oxidizing the H2S contained at low concentration in a gas directly to sulphur by catalytic means and in the vapour pause

Method and catalyst for catalytically oxidizing a low concentration of

Growing community of inventors

Strasbourg, France

Claude Crouzet