Vanadium is easier to be oxidated to higher valence in stop and restart processes which results in activity decreasing.

• 使催化剂中的钒在停开车过程中容易被氧化成高价态，造成活性下降，通过改进催化剂的配方、催化剂装填工艺及催化剂制备工艺，开发出新型苯酐催化剂。