It indicated that K2O,-O-K+and -CO-2K+might be the active sites of radial ac tivation at moderate temperature and fused K+ O- and K+might be the active centers of transv erse activation at higher tem-perature.

• 发现K2O、-O-K+以及-CO-2K+是径向活化为主的中温活化段的活化剂活性组分；而处于熔融状态的K+O-、K+则是横向活化为主的高温活化段的催化活性组分.