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.
Hexagonal and cubic thermally stable mesoporous Tin(IV) phosphates with acidic, basic and catalytic properties / C. Serre, A. Auroux, A. Gervasini, M. Hervieu, G. Ferey - In: Studies in Surface Science and Catalysis, Impact of Zeolites and Other Porous Materials on the New Technologies at the Beginning of the New Millennium, Vol. 142(B), / [a cura di] R. Aiello, G. Giordano, F. Testa,. - Amsterdam : Elsevier, 2002. - ISBN 0-444-51174-1. - pp. 1091-1099 (( convegno 2nd International Conference of the Federation-of-European-Zeolite-Associations tenutosi a TAORMINA, ITALY nel SEP 01-05, 2002.
Hexagonal and cubic thermally stable mesoporous Tin(IV) phosphates with acidic, basic and catalytic properties
A. Gervasini;
2002
Abstract
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.
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