Processing of acid gas compounds in coke oven gas is commonly coupled to a modified Claus sulfur recovery unit. For these applications, Porocel offers our complete range of sulfur recovery catalysts in addition to our specialty HCN conversion catalyst, HCN-100. With HCN-100, HCN conversion is achieved in a separate reaction vessel, downstream of the vacuum carbonate or amine treating process, but upstream of the SRU reaction furnace. Typically, two HCN reactors are installed in parallel so that one may be on-line while the other is in standby mode.


HCN-100 is a promoted alumina catalyst which facilitates the conversion of HCN via the following reactions.

HCN + 2 H2S + 1/2 O2 → CS2 + H2O + NH3

HCN + H2O → NH3 +CO


Recommended Products:

  • HCN-100 – Promoted alumina catalyst for HCN conversion
  • Maxcel 727 - High performance activated alumina Claus catalyst
  • Maxcel 777 - Titania for superior COS and CS2 conversion
  • Maxcel 740 - Promoted alumina for O2 conversion and sulfation guard
  • Maxcel SD-A - Activated alumina for sub-dew point processes
  • Maxcel TGS-01 - Spherical CoMo tail gas catalyst for low pressure drop
  • Maxcel TGS-02 - Low temperature tail gas hydrogenation catalyst
  • actiCAT® presulfurization


Please contact the appropriate Porocel Office if you would like to see Application Bulletins for our products or for a Porocel representative to contact you.


As of November 3, 2020 Porocel is part of Evonik.
  • Evonik successfully completes acquisition of Porocel
  • All Porocel's products and services will be integrated into the Evonik Catalysts portfolio
  • Porocel sales channels will remain in place for the time being

Evonik is one of the world leaders in specialty chemicals. The company is active in more than 100 countries around the world. Evonik goes far beyond chemistry to create innovative, profitable and sustainable solutions for customers. More than 32,000 employees work together for a common purpose: We want to improve life today and tomorrow.