Characterization of acid sites in Beta and ZSM-20 zeolites

摘要: Beta (Si/Al=5-20) and ZSM-20 zeolites with low Si/Al ratios have been synthesized, using tetraethylammonium hydroxide as an organic template, characterized by XRD, SEM, TGA, XPS. The X-ray diffraction study indicated that analcime-like phase crystallizes along zeolite when the starting mole ratio Si/Al∼5. photoelectron spectroscopy (XPS) showed a single-component Gaussian-shaped Al(2p) peak is associated framework Al species present in pure (no other crystalline and/or amorphous phase) Beta, ZSM-20, HY