Spectroscopic and Photophysical Behavior of 2-Quinolone as a Probe for Brønsted and Lewis Acid Sites in Zeolites
作者:Masanobu Kojima、Akira Odaka、Tsuyoshi Nakajima、Yasunao Kuriyama
DOI:10.1246/cl.1999.675
日期:1999.7
Brønsted and Lewis acid sites in zeolites were characterized by using 2-quinolone as a probe, by means of ultraviolet and infrared absorption spectra, fluorescence decay lifetime, and ESR. The results showed clearer differences in the acidity of zeolites compared to those determined by using Hammett indicators. The species observed in the zeolites depended on the acidity, the cavity size, and the amount of 2-quinolone loaded.
使用2-喹啉作为探针,通过紫外和红外吸收光谱、荧光衰减寿命和电子自旋共振(ESR)对沸石中的Brønsted和Lewis酸位点进行了表征。结果显示,与使用Hammett指示剂测定的酸度相比,沸石的酸性差异更加明显。观察到的物种取决于酸性、腔体大小和加载的2-喹啉数量。