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X-ray photoelectron spectroscopy (XPS) and electron probe microanalysis (EPMA) were jointly applied to achieve some basic understandings of the physico-chemical state and aggregation mechanism of surface Cr species on an industrial Phillips CrO x /SiO 2 catalyst calcined in dry air at 800 o C for 20h with 0.4 Cr/nm 2 . The XPS results showed the coexistence of surface-stabilized...
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