Basf Se Corporation

Stefan Lipp

Christian Walsdorff

Holger Borchert

Ulrich Hammon

Markus Schubert

Cornelia Katharina Dobner

Jürgen Zühlke

Matthias Georg Schwab

Josef Macht

Michael Krämer

Philipp Grüne

Cathrin Alexandra Welker-Nieuwoudt

Harry Bouwman

Willem Dijkstra

Jacob Cornelis Van Dorland

Robert Terorde

Star-shaped ceramic body, wherein the cross-section of the body has six lobes, the ratio of the maximum radius r2 in the star to radius r1 of a circle connecting the intersections of the lobes being in the range from 1.0 to 3.61, preferably from 2.17 to 3.61, the ratio of the area F1 inside this circle to the summed area F2 of the lobes outside this circle being in the range of from 0.54 to 0.90, the ratio of the distance x2 between the two intersections I of one lobe with neighboring lobes and the radius r1 of the circle being in the range of from 0.67 to 1.11. The ceramic body is used as catalyst-support.

Star-shaped ceramic body for use as catalyst

The invention relates to shaped catalyst bodies for the oxidation of SOto SO, which comprise vanadium, at least one alkali metal and sulfate on a silicon dioxide support material, wherein the shaped body has the shape of a cylinder having 3 or 4 hollow-cylindrical convexities, obtainable by extrusion of a catalyst precursor composition comprising vanadium, at least one alkali metal and sulfate on a silicon dioxide support material through the opening of an extrusion tool, wherein the opening of the extrusion tool has a cross section formed by 3 or 4 partly overlapping rings whose midpoints lie essentially on a circular line having a diameter of y, wherein the rings are bounded by an outer line lying on a circle having an external diameter x1 and an inner line lying on a circle having an internal diameter x2.

[object Object]

A hollow cylindrical shaped catalyst body for gas phase oxidation of an alkene to an &#x3b1;,&#x3b2;-unsaturated aldehyde and/or an &#x3b1;,&#x3b2;-unsaturated carboxylic acid comprises a compacted multimetal oxide having an external diameter ED, an internal diameter ID and a height H, wherein ED is in the range from 3.5 to 4.5 mm; the ratio q=ID/ED is in the range from 0.4 to 0.55; and the ratio p=H/ED is in the range from 0.5 to 1. The shaped catalyst body is mechanically stable and catalyzes the partial oxidation of an alkene to the products of value with high selectivity. It provides a sufficiently high catalyst mass density of the catalyst bed and good long-term stability with acceptable pressure drop.

Mechanically stable hollow cylindrical shaped catalyst bodies for gas phase oxidation of an alkene to an unsaturated aldehyde and/or an unsaturated carboxylic acid

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Karlsruhe, Germany

Stefan Lipp