Medium temperature shift catalyst
Topsoe’s medium temperature shift catalysts LK-813 and LK-819 are used for the conversion of carbon monoxide at temperatures ranging from 190 to 330ºC.
Topsoe’s MTS catalysts have specifically been developed to cover a wide range of operating conditions: Topsoe MTS catalysts may be used as a replacement for the standard high-temperature shift catalyst in ammonia and hydrogen plants operating at low steam to carbon ratios. In ammonia plants, the MTS catalyst will typically be followed by a low-temperature shift catalyst where the CO content is further reduced.
In new hydrogen plants, the MTS catalysts may replace both the high and low-temperature shift catalysts in which case the MTS exit gas is directly sent to a PSA unit.
Catalyst loading scheme and characteristics
The standard MTS loading is a triple-decker/”sandwich” loading:
The top layer of LSK-2 protects the middle layer of LK-813 from chlorine poisoning apart from having the advantage of being resistant against water droplets.
- At the low temperatures in the top of the bed, the LK-813 has a higher activity than LK-819
- It has a higher sulfur capacity than LK-819 and thus gives a better protection in case sulfur should enter the system
In the hot bottom part, the more thermo-stable LK-819 is installed.