Abstract
In-situ x-ray absorption spectroscopy has been applied to the study of the modifications of the short range order in orthorhombic α-MoO 3 under low and high-temperature hydrogen reduction. It was observed that at low-temperature (T 110°C) reduction, a formation of molybdenum bronzes H x MoO 3 (x ≤ 2) occurs while at high-temperature (T ≥ 400°C) reduction, α-MoO 3 transforms into MoO 2 . Both processes have great applied importance since they are related to electrochromic and catalytic properties of α-MoO 3 . The information on the local atomic and electronic structure, obtained from the Mo K-edge XAFS and XANES analyses, allowed us to follow all steps of the reduction process and to formulate a mechanism of hydrogen interaction with the layered-type structure of α-MoO 3 .
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