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Redox isotherms were measured for zirconia-supported vanadia between 10−2 and 10−28 atm at 748 K for two vanadia loadings, 2.9 and 5.8 V/nm2, corresponding to isolated VO4 species and monolayer, polymeric vanadates. The catalyst with isolated VO4 species, which is expected to have predominantly V–O–Zr linkages, had a redox isotherm that showed a well-defined step corresponding to one oxygen per V...
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