Synthetic ferripyrophyllite: preparation, characterization and catalytic application

Abstract

The synthesis of an iron(iii) silicate with a Si-to-Fe ratio of 2 : 1 and an ultrathin 2D nanosheet morphology is described. The produced phyllosilicate shows high thermal stability and promising properties for catalytic applications.

Ultrathin Two‐dimensional Layered Composite Carbosilicates from in situ Unzipped Carbon Nanotubes and Exfoliated Bulk Silica

“…This is direct evidence of the oxygen functional groups reacting with the iron silicate. Although the C k-edge spectrum and the NEXAFS spectrum shows only small amounts of oxygen on the surface of the formed carbosilicate, a clear increase of the oxygen content on the carbon surface could be confirmed by 13 C NMR (Figure 3c). The CNT displays a broad 13 C peak at 139 ppm, which is ascribed to the sp 2 carbon from the carbon backbone, while the oxidized carbon on the surface displays a shoulder peak at around 235 ppm.…”

“…Although the C k-edge spectrum and the NEXAFS spectrum shows only small amounts of oxygen on the surface of the formed carbosilicate, a clear increase of the oxygen content on the carbon surface could be confirmed by 13 C NMR (Figure 3c). The CNT displays a broad 13 C peak at 139 ppm, which is ascribed to the sp 2 carbon from the carbon backbone, while the oxidized carbon on the surface displays a shoulder peak at around 235 ppm. The intensity ratio of the oxidized/bulk part increases from 0.26 of CNT to 0.46 of 2.1FeÀ CSiO x , and 0.57 of 10FeÀ CSiO x , respectively.…”

“…The observed vibration of SiÀ OÀ Si bond at 1006 cm À 1 in the IR spectra supports the formation of the new bond (Figure 3e). [12] The blue shift of 26 cm À 1 for the SiÀ OÀ Si peak in comparison to iron silicate (1032 cm À 1 ) [13] is most likely caused by the interaction with carbon. The unzipping process of CNT is also supported by the Raman spectra in Figure S16.…”