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What is Degussa (Evonik) P25? Crystalline composition analysis, reconstruction from isolated pure particles and photocatalytic activity test

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Title: What is Degussa (Evonik) P25? Crystalline composition analysis, reconstruction from isolated pure particles and photocatalytic activity test
Authors: Ohtani, B. Browse this author →KAKEN DB
Prieto-Mahaney, O. O. Browse this author
Li, D. Browse this author
Abe, R. Browse this author
Keywords: Powder X-ray diffraction
Anatase-rutile-amorphous mixture
Inhomogeneity of crystalline composition
Less-probable synergetic effect
Issue Date: 15-Dec-2010
Publisher: Elsevier B.V.
Journal Title: Journal of Photochemistry and Photobiology A : Chemistry
Volume: 216
Issue: 2-3
Start Page: 179
End Page: 182
Publisher DOI: 10.1016/j.jphotochem.2010.07.024
Abstract: Anatase and rutile crystallites were isolated from Degussa (Evonik) P25 by selective dissolution with a hydrogen peroxide-ammonia mixture and diluted hydrofluoric acid, respectively, and used as standard samples for calibration curves of X-ray diffraction analyses. The results showed that P25 contains more than 70% anatase with a minor amount of rutile and a small amount of amorphous phase. The composition anatase/rutile/amorphous could be determined by analysis of P25 mixed with an internal standard, nickel(II) oxide. However, it was also found that the composition of P25 used in this study was inhomogeneous and changed depending on the position of sampling from the same package. Comparison of activities of original P25 and reconstructed P25 with those of isolated anatase and rutile particles suggested a less probable synergetic effect of the co-presence of anatase and rutile.
Type: article (author version)
URI: http://hdl.handle.net/2115/44837
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大谷 文章

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