Abstract
The coordination numbers of Al species in zeolites and amorphous silica alumina samples were investigated with three kinds of X-ray spectroscopic technique: namely, X-ray absorption near edge structure (XANES), wavelength dispersive X-ray fluorescence (WD-XRF), and extended X-ray emission fine structure (EXEFS) spectroscopies. XANES, WD-XRF and EXEFS spectra of zeolite samples were identical to those of four-coordinated reference compounds and were distinguishable from those for six-coordinated samples. The energy shift obtained by XANES spectroscopy showed good correlation with those evaluated by WD-XRF and EXEFS.
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