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- W2572875890 abstract "Abstract The research focuses on study of guest phase effect on the surface area and pore volume of SBA-15 with the emphasis on elucidation of reasons for these changes. The changes of surface area and pore volume are evident from evaluated N 2 adsorption isotherms of VOx-SBA-15 even for samples with relative low content of supported guest phase, which is “atomically” spread on the surface in the form of anchored monomeric vanadyl species. These species cannot block the pore with diameter of 10 nm, nevertheless the presence of such phase causes decrease in adsorbed nitrogen during physisorption. Comparison of guest phase amount with differences in adsorbed amount of nitrogen led to conclusion that each vanadyl complex prevents adsorption of about one or two N 2 molecules in the layer and influences two adsorption layers. Significant pore blocking occurs in the VOx-SBA-15 materials only in the case of presence bulk oxide-like nanospecies. Re-structuralization of silica mimicking phase separation phenomena relying on spinodal decomposition of a system was observed by SEM/TEM analysis and adsorption isotherms inspection for materials with high vanadium content." @default.
- W2572875890 created "2017-01-26" @default.
- W2572875890 creator A5028507164 @default.
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- W2572875890 date "2017-01-18" @default.
- W2572875890 modified "2023-09-27" @default.
- W2572875890 title "Textural and morphology changes of mesoporous SBA-15 silica due to introduction of guest phase" @default.
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- W2572875890 doi "https://doi.org/10.1515/pac-2016-1017" @default.
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