Abstract
Abstract Prolonged heat treatment of highly siliceous, template-free ZSM-5 containing Na+ or K+ causes improvement of the lattice structure, migration of alkaline ions to the outer layers of the zeolite particles as shown by XPS and an increased isolation of ≡ Si–ONa sites from ≡ Si–OH sites, as shown by 29Si CP MAS NMR analyses of silylated products.
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