Middle Distillates & Naphtha Hydrotreating Catalysts

Axens’ portfolio has a complete, high performance range of hydrotreating catalysts allowing for increasingly more difficult feedstock to be processed without cycle penalty.

Axens’ catalysts also offer higher flexibility, maximum throughput with higher end boiling point and longer cycles. Axens’ catalysts achieve increased activity by maximizing the amount of catalytically most active mixed Molybdenum (Nickel)/Cobalt sites by an improved promotion, an improved dispersion and improved carrier characteristics.

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Schematic representation of the dispersion phenomenon: with the same number of atoms, Impulse MoS2 slabs have more action sites

The latest generation of boosted catalyst is called Impulse®.

This hydrotreating catalysts range includes HR 1226, HR 1246, HR 1256, HR 1218, HR 1248, HR 1056, HR 1058 and HRK 1448, covering all domains, from naphtha to VGO hydrotreating and hydrocracking pre-treatment.

On the left, a schematic representation of the dispersion phenomenon: with the same number of atoms, Impulse MoS2 slabs have more action sites.

Maximize the utilization of Impulse® Catalysts with Revival®

After regeneration by coke burning, Impulse® Catalysts can be used again directly, however they will suffer from a deficit of activity as compared with a fresh batch of catalysts.

Revival® is an Axens proprietary process of chemical and thermal treatment allowing regenerated Hydroprocessing and Hydrocracking catalysts to recover their original activity. Thanks to a second stage treatment, it allows regenerated Impulse® Catalysts to come back to their original activity.

Key advantages:

  • Activity recovery above 90% as compared with fresh catalysts
  • No impact on the mechanical properties of the catalysts
  • Catalysts handling and activation procedures are similar to fresh catalysts

Depending on the history of the used catalyst, Axens experts, through Revival® offer, guarantee customer performance targets by conducting engineering studies and surveys to maximize the catalysts reuse.

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Speciality Bed Topping

In Hydroprocessing reactors, pressure drop is mainly induced by particulates build-up and gum formations. Pressure drop not only affect the capacity of the unit but can also have detrimental impact on the distribution.


Gums & Polymer formation control

Pressure drop induced by gum formation is frequently encountered in unit processing some cracked feedstock derived from various conversion processes. The olefins and mainly the diolefins contained in these streams tend to polymerize and get oxidized forming a crust which deposit in the upper layers of the reactor.


Silica Management

Silicon is a well-known widespread poison for hydroprocessing catalysts. The main contributor to silicon is the Delayed Coker. In addition, there is a general tendency in the oil production industry to use more silicon-based flow improvers.


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