Binder Effects in SiO₂- and Al₂O₃-Bound Zeolite ZSM-5-Based Extrudates as Studied by Microspectroscopy.

ABSTRACT: Microspectroscopic methods were explored to investigate binder effects occurring in ZSM-5-containing SiO₂- and Al₂O₃-bound millimetre-sized extrudates. Using thiophene as a selective probe for Brønsted acidity, coupled with time-resolved in situ UV/Vis and confocal fluorescence microspectroscopy, variations in reactivity and selectivity between the two distinct binder types were established. It was found that aluminium migration occurs in ZSM-5-containing Al₂O₃-bound extrudates, forming additional Brønsted acid sites. These sites strongly influence the oligomer selectivity, favouring the formation of thiol-like species (i.e., ring-opened species) in contrast to higher oligomers, predominantly formed on SiO₂-bound ZSM-5-conta

SUBMITTER: Whiting GT 

PROVIDER: S-EPMC4834610 | biostudies-literature | 2015 Apr

REPOSITORIES: biostudies-literature