noun
catalyst poison; catalytic poison
Technical chemistry term for a substance that reduces or destroys the activity of a catalyst.
硫黄化合物は触媒毒として働くことがある。
Sulfur compounds can act as a catalyst poison.
触媒 is the catalyst itself, while 触媒毒 is a substance that poisons or deactivates the catalyst.
Compound of 触媒 (catalyst) and 毒 (poison).