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- W2043698093 abstract "XPS spectra of supported and unsupported tungsten oxides before and after use in the metathesis reaction of propene are reported. It is shown that the broad peaks, usually measured for supported materials, are due to line broadening caused by differential charging. A new sample preparation technique is described which leads to a considerable reduction of the line broadening. Both XPS and X-ray diffraction show that in fresh catalysts a well-defined phase Of WO3 is present. The reduction of the supported trioxide by propene to W20O58, as concluded from X-ray diffraction measurements, results in the formation of Wv - and/or WIV -species in used catalysts. For unsupported WO3 these lower valencies have been observed in the valence-band spectra." @default.
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- W2043698093 date "1978-01-01" @default.
- W2043698093 modified "2023-10-14" @default.
- W2043698093 title "The XPS spectra of the metathesis catalyst tungsten oxide on silica gel" @default.
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- W2043698093 doi "https://doi.org/10.1016/0368-2048(78)87004-2" @default.
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