Abstract
Mo/HNa-Y zeolites were prepared by the thermal decomposition of Mo(CO) 6 adsorbed on HNa-Y zeolites having various degrees of proton exchange. The maximum content of molybdenum corresponded to two Mo atoms per supercage of the Y zeolite, irrespective of the proton concentration of HNa-Y. The surface Mo/Si ratios obtained by X-ray photoelectron spectroscopy (XPS) were smaller than the bulk Mo/Si ratios. It is suggested that the Mo species are uniformly distributed within the crystallites of zeolites. The oxidation state of the supported molybdenum was investigated by in situ XPS. This technique enabled analysis of the Mo species in low oxidation states. The results of the XPS studies qualitatively agreed with the average oxidation numbers. It was found that Mo o mainly existed in Mo/Na-Y and that Mo/HNa-Y contained a certain amount of Mo 2+ species in addition to Mo 0 species.
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