Catalyst Carrier Shapes catalyst support shapes
ring Micro-sphere extruded pellets pressedrings trilobes zirconia pellets
Shape affects the overall system pressure drop, however, low pressure drop shapes may contain larger void spaces which do not contribute to catalytic activity and may reduce particle strength. Extrudates, typically 1-4mm in diameter, are still used in many applications, but spheres and rings (hollow cylinders) are also becoming more popular. As with refining applications, extrudates with cloverleaf cross sections, known as trilobes or quadrilobes, are critical to incorporating maximum amounts of active catalyst into a reactor. More complex shapes, often with fluted exteriors and holes or channels in the body, allow enhanced geometrical surface area which increases access to the catalytic sites for the reactants.
A wide range of shaped carriers can be manufactured using extrusion and pressing techniques.
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