Skip to content


for optimal performance


Sulfur removal catalyst

Sulfur is the most common feedstock poison, and protection of downstream catalysts requires its removal to ppb levels. Hydrogenation to H2S and then absorption can remove much sulfur, but an effective guard like the ST-201 is often needed for complete purification.

Installing the ST-201 as a bottom layer in the final sulfur absorption reactor eliminates all risk of sulfur breakthroughs. With its large surface area and copper and zinc oxide active sites , it can be used with hydrocarbon feedstocks and other streams, removing H2S and any organic sulfur compounds that pass through the conventional desulfurization section.

Ensure purification at low temperatures 

At low temperatures, your hydrogenation catalyst may not convert all organic sulfur compounds into hydrogen sulfide. While mercaptans and disulfides, for example, are more easily hydrogenated, monosulfides and thiophenes are less reactive and cannot be fully absorbed by the zinc oxide. The ST-201 solves the problem by ensuring complete purification at the end of the process.

Protect against sulfur content variation
Conventional hydrogenation catalysts require a steady level of sulfur content to maintain their activity. When organic sulfur contents fluctuate or rise, sulfur breakthroughs can result and necessitate a guard such as the ST-201.

Compensate for CO2 in your feed

Sulfur breakthroughs can also occur if your hydrocarbon feed contains carbon dioxide, either as a native constituent of natural gas or as part of the hydrogen recycle stream in methanol plants. When the CO2 reacts with hydrogen, steam is formed, the equilibrium concentration of H2S over the zinc oxide absorbent is increased, and sulfur removal suffers. The ST-201 can compensate for equilibrium sulfur and ensure complete purification.


•  Ensures purification at low temperatures
•  Stops sulfur in plants with no hydrogenation section
•  Effectively handles sulfur content variations
•  Compensates for equilibrium sulfur caused by CO2 in your feed

Technical specs

•  Size: 4.5 x 3.4 mm
•  Shape: Cylinder
•  Cu, wt: >35%