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The coordination of Ni 2+ ions in the dehydrated and dealuminated zeolite Y samples were studied by solid-state UV–vis diffuse reflectance spectroscopy. A solid-state dealumination method was employed for preparation of two successively dealuminated zeolite Y using crystalline (NH 4 ) 2 SiF 6 . Both solid-state and aqueous ion exchange methods were used to prepare nickel-containing...
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