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- W2003554513 abstract "The surface structure and the oxidation state of chromia catalysts supported on titania are investigated by vibrational spectroscopy, UV-visible diffuse reflectance measurements, and X-ray photoelectron spectroscopy (XPS). Pronounced changes are observed as the chromia loading is varied between 0.5 and 30 wt%. While isolated surface-bound chromate ions prevail at low coverages, an increasing fraction of trimeric and tetrameric clusters, as well as of higher aggregates, is observed for chromia contents ≥10 wt%. On the 0.5% CrOx/TiO2 catalyst, chromia species in a formal oxidation state of V represent the most abundant surface species, with a significant contribution of Cr (VI). As the chromia coverage is increased, the fraction of Cr(V) is found to decrease, while a growing contribution from Cr(III)/Cr(IV) species is detected. In situ calcination studies show that the temperature of conversion of the Cr(NO3)3 precursor (deposited by incipient wetness impregnation) into the oxidized surface chromate species depends on coverage. With 3 wt% chromia content, coordinatively unsaturated surface chromyl species are observed to develop around 373 K, whereas for 30 wt% chromia coverage, conversion into coordinatively saturated surface chromyl species takes place around 413 K. Laser Raman experiments show that the surface chromia supported on titania does not undergo laser-induced crystallisation under the conditions used." @default.
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- W2003554513 date "1994-02-01" @default.
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- W2003554513 title "Chromia Supported on Titania .III. Structure and Spectroscopic Properties" @default.
- W2003554513 doi "https://doi.org/10.1006/jcat.1994.1057" @default.
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