Details

Autor(en) / Beteiligte

• Zhu, Xiaochun
• Kosinov, Nikolay
• Kubarev, Alexey V.
• Bolshakov, Alexey
• Mezari, Brahim
• Valastyan, Ivan
• Hofmann, Jan P.
• Roeffaers, Maarten B. J.
• Sarkadi‐Pribóczki, Eva
• Hensen, Emiel J. M.

Titel

Probing the Influence of SSZ‐13 Zeolite Pore Hierarchy in Methanol‐to‐Olefins Catalysis by Using Nanometer Accuracy by Stochastic Chemical Reactions Fluorescence Microscopy and Positron Emission Profiling

Ist Teil von

• ChemCatChem, 2017-09, Vol.9 (18), p.3470-3477

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2017

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• An understanding of the role of the hierarchical pore architecture of SSZ‐13 zeolites on the catalytic performance in the methanol‐to‐olefins (MTO) reaction is crucial to guide the design of better catalysts. We investigated the influence of the space velocity on the performance of a microporous SSZ‐13 zeolite and several hierarchically structured SSZ‐13 zeolites. Single catalytic turnovers, as recorded by nanometer accuracy by using stochastic chemical reactions (NASCA) fluorescence microscopy verified that the hierarchical zeolites contain pores larger than the 0.38 nm apertures native to SSZ‐13 zeolite. The amount of fluorescent events correlated well with the additional pore volume available because of the hierarchical structuring of the zeolite. Positron emission tomography (PET) using 11C‐labeled methanol was used to map the 2 D spatial distribution of the deposits formed during the MTO reaction in the catalyst bed. We used PET imaging to demonstrate that hierarchical structuring not only improves the utilization of the available microporous cages of SSZ‐13 but also that the aromatic hydrocarbon pool species are involved in more turnovers before they condense into larger multiring structures that deactivate the catalyst. Further down the hierarchy: Nanometer Accuracy by Stochastic Chemical reActions (NASCA) fluorescence microscopy and Positron Emission Tomography (PET) analysis reveal important catalytic aspects of hierarchically structured zeolites.