catalyst circulation

例句：

1. 1.The catalyst circulation in the reactor is crucial for the reaction to occur efficiently.
   反应器中的催化剂循环对反应的高效进行至关重要。
2. 2. During the catalyst circulation, the reactants are converted into products.
   在催化剂循环过程中，反应物被转化为产物。
3. 3. The design of the catalyst circulation system is critical for achieving high conversion rates.
   催化剂循环系统的设计与实现对于达到高转化率至关重要。