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

Nature Communications
Mingbin GaoZhongmin Liu

Abstract

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.

References

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Citations

Aug 16, 2021·Journal of Cardiac Surgery·Scott M Pappada
Sep 28, 2021·Physical Chemistry Chemical Physics : PCCP·Toyin OmojolaStefan Adrian F Nastase

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Methods Mentioned

BETA
infrared microscopy
fluorescence microscopy
NMR
X-ray
phosphorescence

Software Mentioned

Elements Ar
SIM Analysis
NIS
CFM
SIM
Intelligent Gravimetric Analyzer

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