Differentiation of catalyst and catalyst support in a fixed bed by magnetic resonance imaging

Garnier, A. von; Hardy, Edme H.; Schweitzer, Jean‐Marc; Reimert, R.

doi:10.1016/j.ces.2007.03.034

Cited by 7 publications

(2 citation statements)

References 6 publications

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“…More reactant vapour and its faster diffusive transport as compared to the liquid phase accelerate the reaction and lead to the fast catalyst temperature rise and the substantial emptying of the pellet. At some point, however, the mass transport and/or phase transition processes become the bottleneck, the reaction subsides and the liquid front advances again (images [15][16][17][18][19][20][21][22][23]. The results seem to indicate that the ignition starts in the subsurface region of the catalyst pellet.…”

Section: Imaging Of Single-catalyst-pellet Reactorsmentioning

confidence: 99%

“…It was reported that upon reduction of adsorbed hexachloroplatinate, the T 1 relaxation contrast became much less pronounced or even unobservable. 12 However, in a different study 15 it was demonstrated that the spin-spin relaxation time T 2 of n-heptane was different in the catalyst (Pd/Al 2 O 3 ) and support (Al 2 O 3 ) particles. A 3D image of a bed of randomly mixed catalyst and support particles was then detected and partitioned into the individual beads.…”

Section: Preparation Of Supported Catalystsmentioning

confidence: 99%

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Magnetic resonance imaging methods for in situ studies in heterogeneous catalysis

2010

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Magnetic resonance imaging (MRI) is a very powerful instrument used extensively in modern medical diagnostics because of its ability to look inside a body in a non-invasive and non-destructive way. Furthermore, MRI is more than just a single tool for extracting structural information. It is more of a sophisticated and versatile toolkit able to provide all sorts of useful information about the internal properties of an object under study and various processes within it, including heat and mass transport, composition and chemical transformations, in a spatially resolved mode. While a living body is different from a catalyst body or a reactor, the in situ and Operando studies in catalysis can clearly benefit from the use of this non-destructive toolkit as a powerful complement to other available spectroscopic tools. This tutorial review gives an introduction to the field and describes the examples of the applications of MRI to the studies of the preparation, deactivation and regeneration of solid catalysts and to the spectroscopy, thermometry and imaging studies of heterogeneous catalysts and model catalytic reactors performed during actual catalytic processes.

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