Casale's sour CO-shift utilizes Casale’s extremely well-proven axial-radial flow catalyst bed technology which ensures low pressure drop, increases little as the catalyst ages.

On account of the low pressure drop, the Casale axial-radial sour shift converter can be designed with a much slimmer pressure vessel than is needed in an axial-flow design and, consequently, a thinner pressure vessel wall. That results in a significant capital cost saving, especially for the first shift converter. Owing to the high operating temperature, in the Casale axial-radial converter the inward gas flow keeps hot gas at the center of the converter, away from the vessel wall, so that only the outlet nozzle is exposed to high temperatures, so the Casale sour shift converter is much easier, cheaper and robust in construction.