Abstract
The characterization of MoY zeolites prepared by aqueous ion exchange is described. Zeolites containing up to 5 Mo per unit cell have been obtained. The ion exchange produces a zeolite containing Mo +6, acidic protons, and adsorbed pyridine. Activation by heating in vacuo causes loss of pyridine and reduction of up to 18% of the molybdenum to Mo +5. Further reduction cannot be achieved by heating in H 2 up to 700 °C. EPR spectra of Mo +5 species indicate that molybdenum cations occupy sites both in the supercages and the β cages of the zeolite.
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