# US 10,307,741 B2 · Shaped catalyst body for the catalytic oxidation of SO2 into SO3

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- Number: US 10,307,741 B2
- Document ID: US10307741B2
- Status: Granted
- Kind: B2
- Application number: 15/562,019
- Filed: 2016-03-16
- Published: 2018-04-19
- Granted: 2019-06-04
- Earliest claimed: 2015-03-27
- Assignees: BASF SE
- Applicants: BASF SE
- Inventors: Philipp Grüne; Christian Walsdorff; Markus Schubert; Holger Borchert; Jacob Cornelis Van Dorland; Jürgen Zühlke; Stefan Lipp; Michael Krämer
- Web page: https://patentgrep.com/patent/US10307741B2

## CPC

- B01J 27/055: with alkali metals, copper, gold or silver
- B01J 21/08: Silica
- B01J 23/22: Vanadium
- B01J 35/19: {Catalysts containing parts with different compositions}
- B01J 35/32: Bulk density
- B01J 35/40: characterised by dimensions, e.g. grain size (in a colloidal state B01J35/23; crystallite size B01J35/77)
- B01J 35/55: Cylinders or rings
- B01J 35/61: Surface area
- B01J 37/0009: {Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst}
- B01J 37/0018: {Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)}
- C01B 17/79: containing vanadium
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}

## Abstract

The invention relates to shaped catalyst bodies for the oxidation of SO2 to SO3, 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.

## Claims

### Claim 1

A shaped catalyst body for the oxidation of SO2 to SO3, which comprises 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 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 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 circle having an external diameter x1 and an inner circle having an internal diameter x2.

### Claim 2 (depends on 1)

The shaped catalyst body according to claim 1, wherein the cross section is formed by 4 annular rings and the midpoints of the rings forming the cross section form a square.

### Claim 3 (depends on 1)

The shaped catalyst body according to claim 1, wherein the ratio of the external diameter of the rings to the diameter of the circular line x1:y is from 0.8:1 to 2:1.

### Claim 4 (depends on 1)

The shaped catalyst body according to claim 1, wherein the ratio of the external diameter to the internal diameter of the rings x1:x2 is from 1.5:1 to 5:1.

### Claim 5 (depends on 1)

The shaped catalyst body according to claim 1, wherein the ratio of the average length z of the shaped bodies to the external diameter of the rings z:x1 is from 1:1 to 6:1.

### Claim 6 (depends on 1)

The shaped catalyst body according to claim 1, wherein outer circles and inner circles of the rings are concentric.

### Claim 7 (depends on 1)

The shaped catalyst body according to claim 1, wherein all rings have the same external diameter x1 and the same internal diameters x2.

### Claim 8 (depends on 1)

The shaped catalyst body according to claim 1 having one or more of the features (i) to (iv):
(i) diameter y of the circular line in the range from 4 to 9 mm;
(ii) external diameter x1 in the range from 5.5 to 11 mm;
(iii) internal diameter x2 in the range from 2.2 to 7 mm;
(iv) average length z of the shaped bodies in the range from 10 to 35 mm.

### Claim 9

A process for producing shaped catalyst bodies comprising vanadium, at least one alkali metal and sulfate on a silicate support material from a catalyst precursor composition comprising vanadium, at least one alkali metal and sulfate on a silicate support material 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 4 partly overlapping annular rings which are bounded by an outer circle having an external diameter x1 and an inner circle having an internal diameter x2 and whose midpoints lie on a circular line having the diameter y.

### Claim 10 (depends on 1)

A process for the oxidation of SO2 to SO3, wherein a gas mixture comprising oxygen and sulfur dioxide is brought into contact at a temperature in the range from 340 to 680° C. with a bed of shaped catalyst bodies according to claim 1.