Shaped catalyst body for flow-through fixed-bed reactors
View Patent ↗The invention relates to a shaped catalyst body for the catalytic conversion of organic and inorganic components in fixed-bed reactors, wherein the shaped catalyst body is formed as cylinder with a base, a cylinder surface, a cylinder axis and at least one continuous opening running parallel to the cylinder axis, and the base of the cylinder has at least four corners.
1. A shaped catalyst body for the catalytic conversion of organic and inorganic compounds in fixed-bed reactors, wherein the shaped catalyst body ( 100 ; 200 ; 300 ; 400 ) has the form of a cylinder with a base ( 150 ), a cylinder surface ( 152 ), a cylinder axis ( 154 ) and at least one continuous opening ( 160 ) running parallel to the cylinder axis, and the base of the cylinder has at least four lobes ( 110 , 120 , 130 , 140 ; 210 ; 220 , 230 , 240 ; 310 , 320 , 330 , 340 ; 410 , 420 , 430 , 440 ), and has a geometric surface area and a volume, wherein the ratio of the geometric surface area of the shaped catalyst body to the volume of the shaped catalyst body is in the range from 1 to 1.8 mm −1 .
2. The shaped catalyst body according to claim 1 , wherein a geometric base body enclosing the shaped catalyst body is a prism ( 10 ) which has a prism base with a length and a width, wherein the length is greater than the width.
3. The shaped catalyst body according to claim 2 , wherein the prism ( 10 ) is a cuboid; and/or
wherein the ratio of the volume of the shaped catalyst body to the volume of the surrounding cuboid is greater than 80% without taking the at least one opening into account and greater than 70% taking the at least one opening into account; and/or
wherein the lobes are enclosed by prism corners of the prism base; and/or
wherein two lobes define the length of he prism base and/or two lobes define the width of the prism base.
4. The shaped catalyst body according to claim 2 , wherein the dimension or height of the shaped catalyst body parallel to the cylinder axis is in the range from 2 mm to 20 mm and/or
the length of the prism base is in the range from 2 mm to 10 mm.
5. The shaped catalyst body according to claim 4 , wherein the dimension or height of the shaped catalyst body parallel to the cylinder axis is in the range from 3 mm to 6 mm.
6. The shaped catalyst body according to claim 4 , wherein the length of the prism base is in the range from 4 mm to 8 mm.
7. The shaped catalyst body according to claim 1 , wherein a recess ( 172 ) is provided in the cylinder surface between two adjacent lobes, and/or a protrusion ( 170 ) is provided in the cylinder surface between two adjacent lobes.
8. The shaped catalyst body according to claim 7 , wherein the protrusion is provided between lobes that define the length, and/or the recess provided between lobes that define the width.
9. The shaped catalyst body according to claim 7 , wherein the external diameter of the cylinder or the distance between two opposite recesses is in the range from 3 mm to 10 mm; and/or
the diameter of the opening is in the range from 0.5 mm to 4 mm.
10. The shaped catalyst body according to claim 9 , wherein the external diameter of the cylinder or the distance between two opposite recesses is in the range from 5 mm to 8 mm.
11. The shaped catalyst body according to claim 9 , wherein the diameter of the opening is in the range from 1 mm to 3 mm.
12. The shaped catalyst body according to claim 1 , wherein the shaped catalyst body has four lobes; and/or
wherein the shaped catalyst body has two recesses arranged opposite each other and/or two protrusions arranged opposite each other.
13. The shaped catalyst body according to claim 12 ,
wherein at least one element selected from the recesses, and the protrusions is rounded.
14. The shaped catalyst body according to claim 12 , wherein each of the protrusions has a rounded shape in the form of a circular arc, wherein the radius of the circular arc formed by the protrusions is in the range from 2 mm to 3.5 mm and/or
wherein each of the recesses has a rounded shape in the form of a circular arc,
wherein the radius of the circular arc formed by the recesses is in the range of from 1 mm to 9 mm.
15. The shaped catalyst body according to claim 1 , wherein the each of the lobes has a center of gravity ( 180 ), wherein the distance between the center of gravity of each lobe and the cylinder axis is in the range from 1.5 mm to 5 mm and/or at least two of the lobes are different from each other and/or
the lobes have a rounded shape, wherein the rounded shape has a diameter in the range from 1 to 2 mm and/or
the lobes have a rounded shape in the form of a circular arc, wherein the radius of the circular arc is in the range of from 0.5 to 2.5 mm.
16. The shaped catalyst body according to claim 15 , wherein the lobes are arranged in the base such that the angle between the perpendicular on a straight line through the centers of gravity of two lobes that define the width of a prism base and a straight, line through the center of gravity of these lobes and through the cylinder axis is in the range from 10° to 75°.
17. The shaped catalyst body according to claim 16 , wherein the lobes are arranged in the base such that the angle between the perpendicular on a straight line through the centers of gravity of two lobes that define the width of a prism base and a straight line through the center of gravity of these lobes and through the cylinder axis is in the range from 25° to 60°.
18. The shaped catalyst body according to claim 15 , wherein the distance between the center of gravity of each lobe and the cylinder axis is in the range from 2.5 mm to 4 mm.
19. The shaped catalyst body according to claim 1 , wherein the bulk density of the shaped catalyst body is less than 0.75 kg/l and/or
an average unidirectional lateral compressive strength is greater than 28 N and/or a different average unidirectional lateral compressive strength is greater than 70 N.
20. The shaped catalyst body according to claim 1 , comprising
at least one element selected from mixed oxides of vanadium and phosphorus, one or more metals of the sub-groups of the periodic table, a metal oxide or a mixed metal oxide of metals of the sub-groups of the periodic table, and one or more noble metals.
21. The shaped catalyst body according to claim 1 , comprising at least one element selected from aluminium oxide, silicon dioxide, aluminium silicate, zirconium dioxide, and titanium dioxide.