名词
中文翻译：用过的催化剂
同义词：
['used catalyst', 'spent reagent例句：1. The spent catalyst was collected and analyzed for recycling purposes.（用过的催化剂被收集并用于回收目的。）']
例句：
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1. The spent catalyst was collected and analyzed for recycling purposes.
用过的催化剂被收集并用于回收目的。
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2.During the reaction, the spent catalyst was removed and replaced with fresh material.
反应过程中，用过的催化剂被移除并用新鲜材料替换。
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3. The spent catalyst was tested for its remaining activity before being disposed of.
用过的催化剂在被丢弃前，先测试其剩余活性。