这样就避免了催化剂与原料中的污染物和重质毒物接触，因而催化剂使用寿命较长。
Thus the contact of the catalyst with pollutants in feedstock and heavy toxicants is avoided. So the catalyst service life is longer.
在另一实施方案中，本发明用覆盖层涂布催化元件的上游端，由此产生上游毒物捕获区。
In an alternative embodiment, the present invention provides for the coating of the upstream end of a catalytic member by the overcoat layer, thereby creating an upstream poison capture zone.
羰基镍是铜基合成甲醇催化剂的毒物。
Iron and nickel carbonyls can deactivate the copper-based catalyst for methanol synthesis.
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