Excel® Rejuvenation Technology


The patented Excel® rejuvenation process is a step beyond standard catalyst regeneration. It offers a means for restoring spent catalysts, especially the highly active Type II, to greater than 90% of the catalyst’s original activity, depending on certain physical and chemical criteria.


The patented Excel rejuvenation process gives refiners an excellent alternative to fresh catalyst in a wide range of hydrotreating applications from naphtha to heavy gas oil.


First Evonik evaluates the spent catalyst to ensure only high quality uncontaminated catalysts are selected for rejuvenation.

Prior to the rejuvenation step, the spent catalyst is regenerated under oxidative atmosphere to remove both carbon and sulphur.

Then a propiertary chemical treatment is carried out to remove the inactive crystalline compound such as β-CoMoO4 or NiMoO4, redisperse metals and restore active sites for maximum activity.


  • Excel® technology rejuvenates both Type I and Type II catalysts to over 90% of fresh catalyst activity at less than half the cost.
  • More favorable economics than using fresh catalyst.
  • Evonik provides extensive technical support from start-up through the end of cycle to help refiners achieve maximum catalyst performance.
  • Excel® technology and associated services are available in North America, Europe and Asia.

Performance Data

Excel® proprietary chemical treatment allows removing inactive crytalline structures, such as β--CoMoO4 or NiMoO4, formed during thermal regeneration.

Excel rejuvenation technology expands the range of hydrotreating catalysts across all major manufactures and consistently restores Relative Volumetric Activity (RVA), both HDS and HDN, to more than 90% versus the fresh analogue. Excel rejuvenation is applicable to Type I and Type II NiMo and CoMo catalysts in a wide range of hydrotreating applications from naphtha through heavy gas oil.  The following testing was performed under SRGO on a Type II CoMo catalyst:


Operating conditions

Sulfur content

11 000 ppmwt

Liquid Hourly Space Velocity (LHSV)

1.0 hr-1


41.4 bar

Weighted Average Bed Temperature (WABT)



214 SL/L

More information here: