摘要
本文对酸改性海泡石的表面酸性及其与酸改性海泡石的烃反应性能之间的关系进行了考察。结果表明,经酸改性海泡石仍然只存在L酸,但酸中心热稳定性有所增强;L酸的产生与八面体层中有空余配位的阳离子及四面体层中三价阳离子有关。酸改性前后海泡石极弱的表面酸性导致其很难使烃类形成正碳离子,但在已形成正碳离子的体系中,海泡石中的L酸对芳烃歧化反应有一定的促进作用。
The acidity and the relationship between hydrocarbon reaction behavior and acidity of acid modified sepiolite have been studied. The results show that only Lewis acid sites are founed in the acid modified products as well as natural sepiolite, but the thermal stability of acid sites is strengthened. The octahedral cations having unsaturated coordinate valence and trivalent tetrahedral cations are responsible for the formatiofi of Lewis acid sites. It is difficult for both sepiolite and modified sepiolites to change hydrocarbons into carbonium ions due to its weeker acidity,hut as soon as carbonium ions have been formed the Lewis acid sites can enhance the disproportionation reaction of aromatics to some extent.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
1994年第2期56-61,共6页
Acta Petrolei Sinica(Petroleum Processing Section)
