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• W1989802103 abstract "The strong metal-support interaction (SMSI) in the system consisting of iron supported on high-surface-area titania powder was investigated. By observation of the anatase-rutile phase transition, titania grain enlargement, and the SMSI effect at several reduction temperatures in the range 643–873 K, it was found that these three phenomena occur simultaneously at reduction temperatures above 723 K. This suggests that the three phenomena are interrelated, and that the phase transition and grain enlargement are important factors concerning SMSI in high-surface-area powder samples. A mechanism has been proposed whereby Ti3+ defect centers in the titania lattice formed from support reduction are responsible for acceleration of phase transition and grain enlargement, and the TiOx, species that migrates onto supported metal particles is formed during the chaotic state of simultaneous phase transition and grain enlargement. At the temperature of the onset of the above three phenomena (~723 K), a stabilization against high-temperature sintering of iron particles became evident, suggesting that this effect becomes operative at the onset of SMSI. Iron particles supported on rutile were significantly smaller than anatase-supported particles which were reduced at the same temperature. The rutile was formed from anatase before impregnation with iron by reduction in hydrogen at 873 K followed by oxidation with oxygen at 473 K. The smaller iron particles and incomplete iron reduction were attributed to O−2 ions adsorbed to the titania surface which acted to anchor Fe3+ and/or Fe2+ ions to the support, preventing their migration and combination to form large fully reduced iron particles." @default.
• W1989802103 created "2016-06-24" @default.
• W1989802103 creator A5002835427 @default.
• W1989802103 creator A5060775842 @default.
• W1989802103 date "1989-04-01" @default.
• W1989802103 modified "2023-09-27" @default.
• W1989802103 title "Importance of the anatase-rutile phase transition and titania grain enlargement in the strong metal-support interaction phenomenon in Fe/TiO2 catalysts" @default.
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• W1989802103 doi "https://doi.org/10.1016/0021-9517(89)90105-x" @default.
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