Effect of aluminum on the nature of the iron species in Fe-SBA-15

Article Abstract:

Ultraviolet (UV) resonance Raman spectroscopy is used to study the location and coordination environment of Fe ions in SBA-15-type mesoporous materials. Complementary techniques have shown that Fe species are mainly located in the silica walls in Al-free SBA-15, whereas they occupy pseudo-tetrahedral or octahedral extraframework positions in Al-containing SBA-15.

Industrial sand, Silica & Silica Sand, Industrial Sand Mining, Silica, Aluminum, Aluminum (Metal), Iron, Iron (Metal)

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Ti-peroxo species in the TS-1/H2O2/H2O system

Article Abstract:

The study of the active species present on the TS-1-H2O2/H2O catalytic system and elucidation of the mechanisms of formation and interconversion of these species is discussed. It is demonstrated that gentle drying of the TS-1-H2O2/H2O system leads to the transformation of the yellow peroxo groups into noncolored species, still located at Ti centers.

Science & research, Research, Chemical bonds, Titanium

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Surface modifications of Bioglass immersed in TRIS-buffered solution: A multitechnical spectroscopic study

Article Abstract:

The dissolution of 2-(mu)m-ze particles of Bioglass in TRIS-buffered solution is presented, focusing on the modification occurring at the surface of the particles. The results confirm the hypothesized mechanism of Bioglass reactivity and yield new insights on the surface modifications of the samples.

Italy

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