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Siting of the Co 2+ ions in dehydrated Co-ZSM-5 is suggested based on a VIS optical study, the MFI topology and parallelism between the spectra of the Co 2+ ions and local framework structures in ZSM-5, mordenite and ferrierite. The proposed Co 2+ ion sites represent a first attempt to describe the cationic sites for transition metal ions in the MFI structure...
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