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Quantitative IR studies were realized in order to determine the concentration of Ni 2+ and Ni + in two zeolites NiZSM-5 differing in Si/Al and nickel content. The NiZSM-5 zeolite of Si/Al=11.5 contained most of Ni 2+ in exchange positions whereas another one, of Si/Al=40 contained most of Ni 2+ in the form of oxides. Also the Ni + ions in NiZSM-5 reduced by...
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