KC-401 catalyst is defined as a sulfur recovery catalyst for the Claus reaction with the carrier of Al2O3.

KC-402 is a deoxygenating catalyst used for sulfur recovery units, particularly suitable for the feed gas with an unstable H2S content or flowrate.

KC-403 catalyst is specialized for Claus exhaust hydrogenation with its carrier of γ-Al2O3 and active components of Co and Mo.

KC-404 is a TiO2-based sulfur recovery catalyst.