Abstract
Methanol chemisorption was successfully developed to quantify the number of surface active sites (N s ) and the methanol oxidation turnover frequencies (TOF) of metal oxide catalysts (supported molybdenum oxides, bulk metal molybdates and bulk metal oxides). This is the first example in the catalysis literature where the N s and TOF values of different types of metal oxide catalysts have been quantitatively compared for an oxidation reaction. Comparable values of N s and TOF were obtained for the corresponding molybdate catalysts (e.g., MoO 3 /Al 2 O 3 and Al 2 (MoO 4 ) 3 ), which reflect the influence of the cation ligands in these catalysts (e.g., Al). Further comparison with the pure metal oxides (e.g., MoO 3 and Al 2 O 3 ), suggests that the bulk metal molybdate catalysts are enriched in surface Mo and may actually possess a surface molybdenum oxide overlayer. These new insights account for the special properties of bulk metal molybdates during catalytic oxidation reactions.
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