R. P. Fiber & Resin Intermediates

Rhone-poulenc Chimie

Societa' Italiana Resine S.i.r. S.p.a.

Rhodia Fiber & Resin Intermediates

Stamicarbon B.v., Licensing Subsidiary of Dsm

Ferruccio Trifiro

Gilbert Blanchard

Fabrizio Cavani

Paolo Burattin

Stefania Albonetti

Pierluigi Villa

Pio Forzatti

Luciano Cairati

St&eacute;fano Masetti

Ammoxidation catalysts for fluidized/moving bed reactors

Method for preparing ammoxidation catalysts

Mixed oxide vanadium/antimony/titanium ammoxidation catalysts, particularly suited for the ammoxidation of alkanes and exhibiting X-ray diffraction spectra which are characteristic of a crystallographic phase of rutile TiO.sub.2, are prepared by (a) dissolving respective soluble compounds of vanadium, of antimony and of titanium in at least one saturated alcohol, (b) contacting the alcoholic solution thus obtained with water and precipitating the mixed oxide therefrom, and (c) separating and calcining the mixed oxide thus precipitated.

Vanadium/antimony/titanium mixed oxide and process of use in vapor phase

Vanadium/antimony/tin mixed oxides having the empirical formula (I):

Mixed V/Sb/Sn oxide ammoxidation catalysts

Preparation of VSb.sub.a aTi.sub.b O.sub.x ammoxidation catalysts

This invention provides a catalyst composition suitable for the gas phase oxidation, ammoxidation and oxidative dehydrogenation of olefins to unsaturated aldehydes, unsaturated nitriles and dienes respectively. The catalyst composition comprises, as active catalyst component, a solid solution of Fe, Sb and Ti oxides which has a rutile type crystal structure which is present in the composition in an amount of at least 80 wt. %, and which is represented by the empirical formula Fe.sub.x Sb.sub.y Ti.sub.z O.sub.w, wherein, for x=1, y is in the range of 0.5 to 10, z is in the range of 0.16 to 209 and w represents the number of oxygen atoms corresponding to the oxides of the above elements. The catalyst component is prepared by co-precipitating metal oxides from solutions of corresponding metal salts followed by calcination at 600.degree.-1000.degree. C. of the washed and dried precipitate.

Process for preparing an oxidation catalyst

A catalyst active in the oxidation of methanol to formaldehyde is prepared by forming a suspension of an amorphous precipitate by mixing an aqueous molybdate solution with an aqueous solution of a ferric salt, while maintaining an atomic ratio Mo/Fe of at least 1.5:1 in the mixture, heating the suspension at 70.degree.-100.degree.C for at least 30 minutes, washing the resulting precipitate with water to remove the soluble salts and at least a part of the excess of soluble molybdate not transformed into iron molybdate, thereby to ensure in the washed solid an atomic ratio Mo/Fe of from 1.5:1 to 1.7:1, and drying the washed solid at a temperature not exceeding 120.degree.C for a period of at least 30 minutes. The catalyst consists of iron molybdate Fe.sub.2 (MoO.sub.4).sub.3 with an amount of free molybdenum trioxide ranging from zero to a value such that the atomic ratio Mo/Fe is from 1.5:1 to 1.7:1, and has a crystallinity degree of at least 90%.

Process for preparing a catalyst for the oxidation of methanol to

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Bologna, Italy

Ferruccio Trifiro