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- W1992480317 abstract "The influence of pretreatments with He, O2 and H2 on the physicochemical and catalytic properties of gold supported on hexagonal mesoporous silica (HMS) has been studied by a variety of methods including: XPS, TPR, N2 sorption, UV–visible spectroscopy, FTIR and catalytic testing. The investigations show supported gold to form different states under redox treatments: Au3+ and Au+ ions, neutral and partly charged gold clusters and metal nanoparticles of different sizes. Reducing pretreatments increase the catalytic activity of the samples; while oxidative treatments deactivate the catalyst. Catalytic tests show several regions of the reduced samples with various catalytic behaviours: 20–200 °C, 200–400 °C and >400 °C; this situation is explained by the co-existence of gold active sites of different types. A comparative analysis among spectroscopic and catalytic data allows suggesting Aunδ+ clusters to be responsible for the activity in the low-temperature region (<200 °C); neutral Aun clusters are active in the range 200–400 °C; and gold nanoparticles may catalyze high-temperature CO oxidation. Au3+ ions are inactive in this process." @default.
- W1992480317 created "2016-06-24" @default.
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- W1992480317 date "2013-08-01" @default.
- W1992480317 modified "2023-10-03" @default.
- W1992480317 title "Effect of redox treatments on activation and deactivation of gold nanospecies supported on mesoporous silica in CO oxidation" @default.
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- W1992480317 doi "https://doi.org/10.1016/j.fuel.2012.09.064" @default.
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