摘要
研究了正己烷在不同硅铝比的 Y,β两个系列分子筛上的裂化反应过程。通过对某些典型产物的初始生成速率和分子筛酸密度关系的考察 ,发现两者之间存在着良好的线性相关性。同时 ,对正己烷裂化反应链长和分子筛酸密度关系的考察表明 ,与分子筛的孔结构相比 ,酸密度对正己烷裂化反应链长基本上没有影响 ,也就是说酸密度的变化并不改变单、双分子反应的发生比例 ;双分子反应和单分子反应都是在单个酸位上完成的。基于以上事实 ,认为正己烷裂化反应中的双分子氢转移反应遵循 Rideal机理。
The cracking of n hexane over the two series zeolites,Y and β ,was studied. By means of measuring the initial producing rates for the some primary products,a well linear correlation was found between these initial rates and acid site density of zeolite. Additionally,compared to structure pore diameter of zeolites,variety of acid site density didn′t exert a significant effect on the cracking chain length of n hexane.The result showed that bimolecular hydride transfer reactions occurred on single acid site of zeolite surface just like monomolecular reactions.On this basis,a conclusion is proposed that bimolecular reactions in the cracking of n hexane proceeded via Rideal mechanism.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2000年第4期6-12,共7页
Acta Petrolei Sinica(Petroleum Processing Section)
关键词
正己烷
双分子
分子筛
氢转移
炼油
催化裂化
n
hexane
cracking
bimolecular reaction
zeolite
acid site density
Langmuir Hinshelwood
Rideal
mechanism
