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A hierarchical (mesoporous) ZSM-22 zeolite displays a greatly enhanced sorption capacity for n-octane, compared to its purely microporous parent. In n-octane hydro-isomerisation, the mesoporous bi-functional Pt/ZSM-22 catalyst clearly outperforms its microporous parent, judged by the higher monobranched isomer yield. This is attributed to an increased number of accessible micropore mouths in the mesoporous zeolite.
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Verboekend et al. (2011) studied this question.
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