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