Is the B217 LTS catalyst self-guarding, or is a Chloride & Sulfur Guard needed?

Is the B217 LTS catalyst self-guarding, or is a Chloride & Sulfur Guard needed?

Is the B217 LTS catalyst self-guarding, or is a Chloride & Sulfur Guard needed?
 Low temperature shift(LTS) catalyst B217 catalyst is used for CO conversion process in the syngas productions of ammonia plant, same as HTS catalyst. 
●Self-guard catalyst: Yes it is. Chloride & Sulfur guard is not needed to load of the top of low temperature shift(LTS) catalyst B217. It can remove trace chloride and sulfur during the running.
●Chloride&sulfur guard: It is guard catalyst(5%-10%) of some brands, to protect the main LTS catalyst for reaction. If customers want to keep the same loading mode of previous brands, we can supply chloride and sulfur guard also.