论文部分内容阅读
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。
In this paper, the surface acidity of acid-modified sepiolite and its relationship with the hydrocarbon reactivity of acid-modified sepiolite were investigated. The results showed that the acid modified sepiolite still only exists L acid, but the thermal stability of the acid center is enhanced. The production of L acid is related to the vacancies in the octahedral layer of cations and tetrahedral layers of trivalent cations . The extremely weak acidity of the surface of the sepiolite before and after the acid modification makes it difficult for hydrocarbons to form positive carbon ions. However, L-acid in sepiolite contributes somewhat to the disproportionation of aromatics in the system that has been formed effect.