Effects of crystal size on methanol to hydrocarbon conversion over single crystals of ZSM-5 studied by synchrotron infrared microspectroscopy

Ivalina B Minova, Santhosh K. Matam, Alex Greenaway, C. Richard A. Catlow, Mark D. Frogley, Gianfelice Cinque, Paul A. Wright* (Corresponding Author), Russell F. Howe* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Operando synchrotron infrared microspectroscopy (OIMS) was used to study the conversion of methanol over coffin-shaped HZSM-5 crystals of different sizes: large (∼250 × 80 × 85 μm3), medium (∼160 × 60 × 60 μm3) and small (∼55 × 30 × 30 μm3). The induction period, for direct alkene formation by deprotonation of surface methoxy groups, was found to decrease with decreasing crystal size and with increasing reaction temperature. Experiments with a continuous flow of dimethylether showed that evolution of the hydrocarbon pool and indirect alkene formation is also strongly dependent on crystal size. These measurements suggest that the hydrocarbon pool formation and indirect alkene generation should be almost instantaneous at reaction temperatures used in practical catalysis with crystal sizes typically ∼1 μm3.

Original languageEnglish
JournalPhysical Chemistry Chemical Physics
Early online date5 Mar 2020
DOIs
Publication statusE-pub ahead of print - 5 Mar 2020

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