The effect of exchanging transition metal ions in the alumina-pillared beidellite/montmorillonite FAZA on the conversion of methanol, ethanol, n-propanol and iso-propanol has been investigated. It is concluded that dehydration/dehydrogenation throughout the series of materials occurs preferentially at the oxidic pillar rather than at the aluminosilicate sheet. The basal structure of the smectite, i.e. whether protons lie inside (montmorillonitic) or outside (beidellitic) the aluminosilicate layers, little influences the reactions. By way of contrast, cation exchange (both single and double) greatly influences both product ratio outcomes and conversions, e.g. Ni-FAZA (FAZA = a Fe2+/Fe3+/alumina-pillared mixed beidellite/montmorillonite) has very acidic centres suppressing MeOH dehydration completely.
PLS vs Zeolites as Sorbents and Catalysts. Part 6. Effect of Pore-blocking of Active sites in FAZA on conversions of C1-3 Alcohols
De Stefanis A;
2003
Abstract
The effect of exchanging transition metal ions in the alumina-pillared beidellite/montmorillonite FAZA on the conversion of methanol, ethanol, n-propanol and iso-propanol has been investigated. It is concluded that dehydration/dehydrogenation throughout the series of materials occurs preferentially at the oxidic pillar rather than at the aluminosilicate sheet. The basal structure of the smectite, i.e. whether protons lie inside (montmorillonitic) or outside (beidellitic) the aluminosilicate layers, little influences the reactions. By way of contrast, cation exchange (both single and double) greatly influences both product ratio outcomes and conversions, e.g. Ni-FAZA (FAZA = a Fe2+/Fe3+/alumina-pillared mixed beidellite/montmorillonite) has very acidic centres suppressing MeOH dehydration completely.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
