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StyroMax rib-shaped catalysts

Reactor pressure is critical in styrene production, as elevated pressures increase by-product formation. Extreme pressures may also impact the performance of the evaporating systems. 

The solution: Clariant's StyroMax rib-shaped catalysts’ unique design reduces pressure drop by 30 to 50% compared to standard cylindrical shapes at similar operating conditions.

Going with the flow

StyroMax rib-shaped catalysts have a cylindrical core supported by five ribs that create five channels and strengthen the catalyst pellet. The unique geometry prevents the ribs from fitting into the channels.

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The higher void fraction of the rib extrusions lowers pressure resistance during operation.

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The channels improve flow distribution, enabling more uniform profiles in the reactor.

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Reduced overall pressures greatly benefit the thermodynamics of ethylbenzene dehydrogenation.

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The shape’s high surface area increases catalyst activity, since the reaction rate is mass-transfer controlled.

Lower pressure drop

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  • Proven technology, in commercial operation for more than 30 years

  • Excellent flow distribution throughout loaded beds

  • Higher activity due to greater catalyst surface area

  • Less by-product formation due to favorable pressure conditions

  • Improved performance, stability, and tolerance to operational upsets

  • Available for all StyroMax series catalysts

Unique performance benefits


> 25%

higher mechanical strength
protects catalyst during loading
and operation

> 15%

lower loaded weight
reduces mechanical stress in reactor
and prevents screen damage

> 50%

lower pressure drop
during full cycle favors dehydrogenation
and prevents by-products

Solutions that drive performance

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