Abstract: Magnetic resonance (MR) techniques, including nuclear magnetic resonance (NMR) spectroscopy and magnetic resonance imaging (MRI), are powerful noninvasive tools for in situ and operando investigations of catalytic processes. However, their application to heterogeneous catalytic systems, particularly those involving gaseous reactants, is often limited by magnetic field inhomogeneities caused by conventional solid catalyst supports. In this work, we present hollow spheres as advanced porous catalyst supports that address this issue. Hollow alumina spheres were prepared via template synthesis and characterized using physicochemical methods, including XRD, BET, SEM, and optical microscopy, confirming their η-Al2O3 phase, high surface area (∼302 m2/g), and stable hollow geometry with thin walls (∼0.05 mm). Unlike conventional bulk catalyst particles, these hollow alumina spheres do not cause significant distortions of magnetic field homogeneity. As a result, well-resolved 1H NMR spectra and high-quality MR images of gases and solutions in a granular bed were obtained, greatly enhancing precision in catalytic reactor characterization by MR techniques.

Cite: Kononenko E.S. , Skovpin I.V. , Burueva D.B. , Rogozhnikov V.N. , Shefer K.I. , Salanov A.N. , Koptyug I.V.
Hollow Alumina Spheres: Fabrication, Characterization, and Their Potential for Operando Magnetic Resonance
Analytical Chemistry. 2025. DOI: 10.1021/acs.analchem.5c01321 WOS PMID OpenAlex

Dates:

Submitted:	Mar 4, 2025
Accepted:	Sep 15, 2025
Published online:	Sep 22, 2025

Identifiers:

Web of science:	WOS:001576268200001
PMID:	40981709
OpenAlex:	W4414408330

Citing: Пока нет цитирований

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