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US4157986A Abrasion resistant catalyst 失效
耐磨催化剂

Abrasion resistant catalyst
摘要:
A process for the preparation of catalyst granulates from carbon black, boric acid, water and optionally nitrogenous additives, characterized in that from 3 to 50% by weight of a finely divided catalyst, which has already been used for the preparation of caprolactam and which has optionally been regenerated, are added.
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