Abstract
XAS studies of cobalt-substituted aluminophosphate zeolites (CoAPO-5) indicate that Co +2 cations are incorporated in the zeolite framework, as evidenced by the intense 1s-3d pre-edge feature, the coordination number (4.0), the CoO bond length (1.93 Å) and the very small temperature effect on Debye-Waller factor. Calcination of the as-synthesized material either in air or in nitrogen results in an increased structural disorder. No structural changes due to ammonia exchange or hydrogen reduction are detected indicating framework cobalt is the only phase in our preparations.
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