catalysts催化剂catalystn.催化剂；刺激因素Catalyst Cracking Plant催化裂化装置catalyst microstructure催化剂微观结构catalyst susceptibility催化剂感受性catalyst and oil mixing油剂混合catalyst characteristic催化剂特性catalyst hazard element重油加氢装置catalyst metering system催化剂计量系统catalyst coated membrane直接涂膜catalyst scrubber column催化剂洗涤塔catalyst circulation pipe催化剂循环管线

1. Catalyst returning to the reactor may not be completely regenerated because of insufficient time in the regenerator.
   因为催化剂在再生器中停留时间不足，故返回反应器的催化剂可能未被完全再生。
2. The physical resistance of catalysts plays a major role in catalyst selection and reactor design parameters.
   催化剂的物理强度在催化剂选择和反应器设计参数方面起着重要的作用。