无定形硅铝酸盐中的布朗斯台德酸位点是桥连的吗？
Are the Brønsted acid sites in amorphous silica-alumina bridging?
作者信息
Salvia William S, Zhao Tommy Yunpu, Chatterjee Puranjan, Huang Wenyu, Perras Frédéric A
机构信息
Department of Chemistry and Biochemistry, Miami University, Oxford, OH 45056, USA.
Chemical and Biological Sciences Division, Ames National Laboratory, Ames, IA 50011, USA.
出版信息
Chem Commun (Camb). 2023 Nov 23;59(94):13962-13965. doi: 10.1039/d3cc04237e.
Competing models exist to explain the differences in the activity of zeolites and amorphous silica-aluminas. Some postulate that silica-alumina contains dilute zeolitic bridging acid sites, while others favor a pseudo-bridging silanol model. We employed a selective isotope labeling strategy to assess the existence of Si-O(H)-Al bonds using NMR-based distance measurements.
存在多种相互竞争的模型来解释沸石和无定形硅铝酸盐活性的差异。一些人假定硅铝酸盐含有稀有的沸石桥连酸位点，而另一些人则倾向于伪桥连硅醇模型。我们采用了一种选择性同位素标记策略，通过基于核磁共振的距离测量来评估Si-O(H)-Al键的存在。
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