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Large zeolitec rystals of ferrierite have been used to study the deactivation, at the singlep article level, of the alkyl isomerisation catalysis of oleic acid and elaidic acid by ac ombinationo fv isible micro-spectroscopya nd fluorescence microscopy (both polarised wide-field and confocal modes). The large crystalsd id show the desired activity, albeit only traces of the isomerisation product wereo btained and low conversionsw ere achieved compared to commercial ferrierite powders.T his limited activity is in line with their lower externaln on-basal surfacea rea, supporting the hypothesis of pore mouthc atalysis. Further evidence for the latter comesf rom visible micro-spectroscopy, which showst hat the accumulationo fa romatic species is limited to the crystale dges,w hile fluorescencem icroscopy strongly suggestst he presence of polyenylic carbocations. Light polarisation associated with the spatial resolution of fluorescence microscopy reveals that these carbonaceous deposits are aligned only in the larger1 0-MR channels of ferrierite at all crystal edges.T he reactioni sh ence furtherl imited to these specific pore mouths.

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