X-ray photoelectron spectroscopic studies of catalysts. Chromia-alumina catalysts.

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概要

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• The XPS studies of chromia–alumina catalysts were carried out to elucidate the surface of these catalysts. Photoreduction was found to occur during the XPS measurements. Therefore, all spectra were measured rapidly to prevent any photoreduction. It was found that the information about the spin-orbit splitting of the Cr2P level is very useful for determining the valence state of chromium. The surface state of chromium in chromia–alumina catalysts calcined at 500 °C for 5 h is predominantly Cr<SUP>6+</SUP> at low chromia concentration catalysts. However, the Cr<SUP>3+</SUP> phase appears in catalysts of higher chromium content, and the surface concentration of Cr<SUP>3+</SUP> increases with increasing content of supported chromia. The XPS spectra due to Cr<SUP>5+</SUP> were observed after mild reduction of the catalysts. Moreover, it was found that almost all surface chromium is present as Cr<SUP>5+</SUP> at low chromia content catalysts after mild reductions. Qualitatively, the results obtained by the XPS technique, which gives information about the surface of catalysts, agree well with the results obtained by ESR and other techniques, which gives information about the bulk of catalysts, especially low chromium concentration catalysts. These findings indicate a high dispersion of chromium on γ-Al<SUB>2</SUB>O<SUB>3</SUB> for low chromium content catalysts.

• 公益社団法人 日本化学会の論文

著者

• Imanaka Toshinobu

  Department Of Chemical Engineering Faculty Of Engineering Science Osaka University

• Okamoto Yasuaki

  Department Of Applied Chemistry Tokyo University Of Science Yamaguchi

• Teranishi Shiichiro

  Department of Chemical Engineering, Faculty of Engineeing Science, Osaka University

• Fujii Masaki

  Department of Chemical Engineering, Faculty of Engineering Science, Osaka University

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