Nanoscale infrared imaging of zeolites using photoinduced force microscopy

Fu, Donglong; Park, Katie; Delen, Guusje; Attila, Özgün; Meirer, Florian; Nowak, Derek; Park, Sung Min; Schmidt, Joel E.; Weckhuysen, Bert M.

doi:10.1039/c7cc06832h

Cited by 27 publications

(23 citation statements)

References 27 publications

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“…The confocal fluorescence microscopy (CFM), which shows extraordinary potential in life science 20 , 21 , was demonstrated capable of capturing mobile trajectories of individual conjugated macromolecule in meso- and macro-pore of fluid catalytic cracking (FCC) catalyst pellets 10 , and spatiotemporal evolution of carbonaceous species in model zeolite crystal (larger than 40 μm) in methanol-to-olefins (MTO) and FCC reactions 18 , 22 , 23 . Spatiotemporal-resolved evolution of small molecules (e.g., alkene and alkane) and probe molecules-free measurements of acid sites in catalysts of a few micrometers, which are normally encountered in industrial catalytic processes, remain big challenges 2 , 24 .…”

Section: Introductionmentioning

confidence: 99%

Imaging spatiotemporal evolution of molecules and active sites in zeolite catalyst during methanol-to-olefins reaction

Gao

Liu

et al. 2020

Nat Commun

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Direct visualization of spatiotemporal evolution of molecules and active sites during chemical transformation in individual catalyst crystal will accelerate the intuitive understanding of heterogeneous catalysis. So far, widespread imaging techniques can only provide limited information either with large probe molecules or in model catalyst of large size, which are beyond the interests of industrial catalysis. Herein, we demonstrate a feasible deep data approach via synergy of multiscale reaction-diffusion simulation and super-resolution structured illumination microscopy to illustrate the dynamical evolution of spatiotemporal distributions of gas molecules, carbonaceous species and acid sites in SAPO-34 zeolite crystals of several micrometers that are typically used in industrial methanol-to-olefins process. The profound insights into the inadequate utilization of activated acid sites and rapid deactivation are unveiled. The notable elucidation of molecular reaction-diffusion process at the scale of single catalyst crystal via this approach opens an interesting method for mechanism study in materials synthesis and catalysis.

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Section: Introductionmentioning

confidence: 99%

Imaging spatiotemporal evolution of molecules and active sites in zeolite catalyst during methanol-to-olefins reaction

Gao

Liu

et al. 2020

Nat Commun

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“…Nevertheless, the combination of IRRAS (mm-scale) and PiFM (nm-scale) respectively provides averaged, bulk chemical information complemented by local spectral snapshots of the formed islands and carpet at given synthesis conditions. 40 …”

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confidence: 99%

Time-Resolved In Situ Liquid-Phase Atomic Force Microscopy and Infrared Nanospectroscopy during the Formation of Metal–Organic Framework Thin Films

Mandemaker

Filez

et al. 2018

J. Phys. Chem. Lett.

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Metal–organic framework (MOF) thin films show unmatched promise as smart membranes and photocatalytic coatings. However, their nucleation and growth resulting from intricate molecular assembly processes are not well understood yet are crucial to control the thin film properties. Here, we directly observe the nucleation and growth behavior of HKUST-1 thin films by real-time in situ AFM at different temperatures in a Cu-BTC solution. In combination with ex situ infrared (nano)spectroscopy, synthesis at 25 °C reveals initial nucleation of rapidly growing HKUST-1 islands surrounded by a continuously nucleating but slowly growing HKUST-1 carpet. Monitoring at 13 and 50 °C shows the strong impact of temperature on thin film formation, resulting in (partial) nucleation and growth inhibition. The nucleation and growth mechanisms as well as their kinetics provide insights to aid in future rational design of MOF thin films.

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“…This has become a standard method for the analysis in zeolite catalysis. Weckhuysen and coworkers have developed a series of in situ methods for analyzing coke with in situ spectroscopy …”

Section: Traditional Methods Of Studying Diffusion and Deactivation Imentioning

confidence: 99%

Transport Phenomena in Zeolites in View of Graph Theory and Pseudo‐Phase Transition

Cai

Xiong

Zhang

2019

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hierarchical zeolites to enhance diffusion. A parallel phenomenon, coking, which is the primary cause of the deactivation of zeolite catalysts, leads to pore blockage in the zeolite and adversely affects diffusion rates, and also wastes feedstock and lowers atom efficiency. The suppression of coke formation is also a central topic in catalysis.Traditional kinetic studies regard catalyst pellets as isotropic and describe diffusion with a lumped diffusion coefficient, although in Monte Carlo studies, the zeolite topology is used, and models based on zeolite topology and network are built and the strong coupling of diffusion and deactivation is analyzed. As a complement to these, it is expected that in modern transport research, more use will be made of discrete models. Some exciting new findings from these include pseudophase transition phenomena noted in the deactivation process and the fast transport in nanosized channels and hierarchical catalyst structure. In this review, we seek to provide insights on zeolite diffusion studies from the traditional view to modern discrete models. Transport in Zeolites www.advancedsciencenews.com

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Nanoscale infrared imaging of zeolites using photoinduced force microscopy

Cited by 27 publications

References 27 publications

Imaging spatiotemporal evolution of molecules and active sites in zeolite catalyst during methanol-to-olefins reaction

Imaging spatiotemporal evolution of molecules and active sites in zeolite catalyst during methanol-to-olefins reaction

Time-Resolved In Situ Liquid-Phase Atomic Force Microscopy and Infrared Nanospectroscopy during the Formation of Metal–Organic Framework Thin Films

Transport Phenomena in Zeolites in View of Graph Theory and Pseudo‐Phase Transition

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