Thermally stable hexagonal and cubic mesoporous tin(IV) phosphates have been synthesised via a fluoride route using alkyl di- or tri- methylammonium bromide surfactants. X-ray powder diffraction and HREM show that the hexagonal phase exhibits a MCM-41 organisation while the structure of cubic phase is similar to those of the micellar cubic solid SBA-1. Removal of the surfactant by calcination under air atmosphere of both phases does not destabilise the framework and leads to mesoporous solids exhibiting surface area within the 200-630 m2/g range and pore sizes between 12 and 25 Å. Finally, microcalorimetric studies of the adsorption of NH3 and SO2, indicated that both solids exhibit both a strong acidic and a weak basic character. First de-NOx catalytic tests have also shown positive results for both solids, which indicates that these porous solids represent an interesting family of materials with good catalytic properties.
|Titolo:||Hexagonal and cubic thermally stable mesoporous Tin(IV) phosphates with acidic, basic and catalytic properties|
|Settore Scientifico Disciplinare:||Settore CHIM/02 - Chimica Fisica|
|Data di pubblicazione:||2002|
|Tipologia:||Book Part (author)|
|Appare nelle tipologie:||03 - Contributo in volume|