Higher-alumina ceramic balls provide benefits in demanding temperature, wear, strength or purity service, but conventional inert ceramic grades remain appropriate for many catalyst beds. Select alumina content from process requirements rather than automatically choosing the highest percentage.

Ceramic support-ball crushing strength should provide adequate margin for catalyst-bed load and operating conditions. Do not compare or specify crushing values without identifying ball diameter, material grade and test method.

Bottom ceramic balls support and transition the catalyst bed to the structural grid, while top balls stabilize and protect the catalyst surface. Their required size, depth and sometimes material grade may therefore differ.

Select ceramic support-ball sizes from the catalyst geometry, support-grid openings and graded transition plan. The top support layer must retain the catalyst without introducing unnecessary hydraulic restriction.

Catalyst beds use progressively sized ceramic support balls to combine low pressure drop, strong mechanical support and catalyst retention. Large balls provide structural openness, while smaller upper layers prevent catalyst migration into the support system.