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五配位铝强化硅铝固体酸的固体核磁共振研究
王子春1,黄骏2,姜怡娇1,*()
Solid-State NMR Spectroscopy Studies of Enhanced Acidity of Silica-Aluminas Based on Penta-Coordinated Aluminum Species
Zi-chun WANG1,Jun HUANG2,Yi-jiao JIANG1,*()

图1. 硅铝固体酸中B酸的结构[7]：(a)酸性桥式羟基；(b)酸性伪桥式硅羟基；(c) AlIV与SiOH通过静电作用形成的B酸位.后两个模型中，虚线仅代表原子间的接近关系而不代表成键关系

Fig.1. Proposed models for Brønsted acid sites (BASs) in silica-alumina catalysts[7]. (a) BAS consisting of a bridging silanol site bonded to AlIV site (SiOHAl) in zeolites; (b) BAS consisting of PBS interacting with AlIV site; (c) BAS consisting of the flexible coordination between silanol oxygen and neighbouring AlIV. In the latter two cases, the dotted line does not denote a covalent bond but only the close proximity between O and Al atoms