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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

Styrene Catalysts
Customer Events
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Technical Services
Let our experts help you raise daily production rates, increase yields, extend cycle length, and reduce steam and energy consumption
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Styrene Production Overview
Explore our high-performance catalysts for more economical and sustainable styrene production
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StyroMax Catalyst Portfolio
Select the right StyroMax catalyst from our broad portfolio to boost your styrene unit's profitability


May 25, 2022
Clariant and Lummus awarded contract for one of the world’s largest PDH units
May 25, 2022
Clariant and its process partner Lummus have been awarded a major contract by Fujian Meide to supply CATOFIN technology and catalysts for a new, world-scale propane dehydrogenation (PDH) unit in Fuzhou, China. Already operating one PDH unit at its Fuzhou petrochemical complex, Fujian Meide is now building one of the largest PDH units in the world and has selected the CATOFIN process and catalysts for the project’s second phase. The new unit will produce 900,000 metric tons of propylene annually and is scheduled to commence operation in 2023. more
April 13, 2022
Clariant increases prices across its Catalysts business portfolio
April 13, 2022
Effective immediately, or as contracts permit, Clariant will implement price increases across its Catalysts portfolio. more
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