Abstract
Electron probe microanalysis (EPMA) and X-ray photoelectron spectroscopy (XPS) were jointly applied to study the distribution state of Cr species on a Philllips catalyst with 1wt.% Cr loading. The EPMA images revealed the existence of aggregates of Cr species in sizes of 200-300 nm on the surface of the catalyst, which were supposed to be crystallized aggregates of chromia (Cr2O3). The variation of distribution state of Cr for the catalyst after being treated in various moisture-containing atmospheres had also been studied. It was found that aggregation of Cr species occurred in all treatments. Correspondingly, the variation of binding energy and full width of half maximum intensity (FWHM) of the Cr2p (3/2) spectrum from the XPS analysis gave further evidence for identification of all Cr species formed after the treatments. The formation mechanism of crystallized aggregates of chromia during the calcination of the Phillips catalyst was postulated to be related with a surface-stabilized trivalent Cr species.
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