Single-Molecule Fluorescence Microscopy Reveals Local Diffusion Coefficients in the Pore Network of an Individual Catalyst Particle

We used single-molecule fluorescence microscopy to study self-diffusion of a feedstock-like probe molecule with nanometer accuracy in the macropores of a micrometer-sized, real-life fluid catalytic cracking (FCC) particle. Movies of single fluorescent molecules allowed their movement through the por...

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Podrobná bibliografia
Vydané v:	Journal of the American Chemical Society Ročník 139; číslo 39; s. 13632
Hlavní autori:	Hendriks, Frank C, Meirer, Florian, Kubarev, Alexey V, Ristanović, Zoran, Roeffaers, Maarten B J, Vogt, Eelco T C, Bruijnincx, Pieter C A, Weckhuysen, Bert M
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	United States 04.10.2017
ISSN:	1520-5126, 1520-5126
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Popis
Shrnutí:	We used single-molecule fluorescence microscopy to study self-diffusion of a feedstock-like probe molecule with nanometer accuracy in the macropores of a micrometer-sized, real-life fluid catalytic cracking (FCC) particle. Movies of single fluorescent molecules allowed their movement through the pore network to be reconstructed. The observed tracks were classified into three different states by machine learning and all found to be distributed homogeneously over the particle. Most probe molecules (88%) were immobile, with the molecule most likely being physisorbed or trapped; the remainder was either mobile (8%), with the molecule moving inside the macropores, or showed hybrid behavior (4%). Mobile tracks had an average diffusion coefficient of D = 8 × 10 ± 1 × 10 m s , with the standard deviation thought to be related to the large range of pore sizes found in FCC particles. The developed methodology can be used to evaluate, quantify and map heterogeneities in diffusional properties within complex hierarchically porous materials.
Bibliografia:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1520-5126 1520-5126
DOI:	10.1021/jacs.7b07139