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The basicity of alkali exchanged faujasite type zeolites is estimated on the basis of DFT calculations of the NO + stretching frequencies of adsorbed N 2 O 4 . N 2 O 4 is allowed to interact with the alkali cations and a range of molecules covering a wide basicity scale. An alkali nitrate salt is formed and NO + interacts with the basic molecules. The...
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