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- W2001251550 abstract "Calcinatión of H-mordenite or H-ZSM—5 with some compounds of Cr(III), Cr(VI), Mo(V) and V(V) is accompanied by the migration of metal ions into zeolite channels. The ions, which migrate from the outer surface of zeolite crystals, are coordinated in the cationic positions of the zeolites. Most of the migrated ions are located in H-ZSM—5 channels as isolated cations (Cr(V), Mo(V), V(IV)) accessible to gas phase molecules. The accessibility of the cations is confirmed by the strong influence of O2 adsorption on hyperfine structure (h.f.s.) of e.s.r. spectra for Cr(V), Mo(V) and V(IV). The possibility of cation introduction in high-silica zeolites by a solid-state reaction is determined by the presence of acid sites which may be considered as powerful ‘traps’ for migrating ions. The solid-state interaction at temperatures up to 820°C does not permit the exchange of Na+ cations for polyvalent cations." @default.
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- W2001251550 date "1987-01-01" @default.
- W2001251550 modified "2023-10-11" @default.
- W2001251550 title "Introduction of Cr(V), Mo(V) and V(IV) ions in cationic positions of high-silica zeolites by a solid-state reaction" @default.
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- W2001251550 doi "https://doi.org/10.1016/0144-2449(87)90117-5" @default.
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