The behavior of forming and cracking of carbenium ions was analyzed and the reaction pathway of propylene formation was summarized.

通过分析正碳成与裂解反应特点，探讨了丙烯成规律。

Carbenium ion is an active intermediate state in organic reactions,which has been investigated for over 100 years.

正碳是有机化学反应过种活泼反应间体,对于它研究已经有100多年历史。