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Hydrogen sulfide can cause permanent poisoning of ammonia synthesis catalysts (√)
Yes, hydrogen sulfide is a substance that can cause permanent poisoning of ammonia synthesis catalysts. This is because hydrogen sulfide reacts with the iron in the catalyst to form iron sulfide, and iron sulfide blocks the active centers of the catalyst, causing it to lose its catalytic activity; hence this phenomenon is referred to as \"poisoning\". This type of poisoning is irreversible, which is why it is called permanent poisoning. .