Most hydrogen plants convert CO to CO2 by high-temperature water gas shift (HTS) followed by low-temperature water gas shift (LTS). For special process design, it can be advantageous to combine these two steps to form one isothermal or adiabatic step called medium temperature shift (MTS). These shift reactions are also often called CO conversion.
The HTS catalyst ShiftMax® 120 combines high activity with extremely good physical robustness.In addition, this catalyst is very effective in preventing Fischer-Tropsch by-product formation when operating at low steam to gas conditions.
Low Temperature Shift
Low temperature CO Conversion ShiftMax 210, 230 and 240 are state-of-the-art products featuring excellent copper dispersion leading to unparalleled activity for low temperature water gas shift.
These catalysts feature higher CO conversion for longer life, enhanced resistance to poisons and superior physical strength. The promoter in ShiftMax 240 suppresses the formation of methanol by more than 95 % compared to standard LTS catalysts without decreasing activity. The Chlorine Guard ShiftMax Cl is recommended for the protection of the LTS catalysts.
Medium Temperature Shift
Medium temperature CO conversion (MTS) is carried out in an isothermal system or adiabatic reactor with exit temperatures of around 300°C. The ShiftMax 300 catalyst is a stabilized copper / zinc catalyst featuring excellent stability of the Cu crystallites.
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