Most ammonia 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.
High Temperature Shift
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.
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.
Low Temperature Shift
ShiftMax 210, ShiftMax-Cl
Low temperature CO Conversion ShiftMax 210 is state-of-the-art product 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 Chloride Guard ShiftMax Cl is recommended for the protection of the LTS catalysts.
Sour Gas Shift
Shift reactions downstream of gasification units can be carried out without prior removal of the sulfur compounds. For this sour gas shift, we supply the stabilized CoMo catalyst ShiftMax® 820 with high activity within a wide range of steam to gas ratios.
ShiftMax 820 is potassium free, so there is less downstream equipment corrosion and fouling. Furthermore, ShiftMax 820 has a more stable matrix that ensures the catalyst is highly resistant to hydrothermal degrading, and thus can retain the physical strength under severe operation conditions. ShiftMax 820 is currently operating in multiple production facilities.