Measuring Mass Transport in Hierarchical Pore Systems

Kärger, Jörg; Valiullin, Rustem; Enke, Dirk; Gläser, Roger

doi:10.1002/9783527673957.ch12

Cited by 4 publications

(1 citation statement)

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“…5,[51][52][53][54] Transport phenomena become, however, increasingly complicated for porous solids which combine micro-and mesopores. [55][56][57][58][59] Here, in addition to the already rich dynamics in the individual building blocks of the composite materials, the by far more intricate molecular exchange between these blocks may further complicate the overall mass transfer processes, often to an intractable extent. Notably, the exchange patterns may be determined by not only thermodynamic conditions, but also by the occurrence of additional transport resistances, the impact of which is finding more and more evidences.…”

Section: Dirk Mehlhornmentioning

confidence: 99%

Transport properties of hierarchical micro–mesoporous materials

et al. 2016

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Adding mesopore networks in microporous materials using the principles of hierarchical structure design is recognized as a promising route for eliminating their transport limitations and, therefore, for improving their value in technological applications. Depending on the routes of physico-chemical procedures or post-synthesis treatments used, very different geometries of the intentionally-added transport mesopores can be obtained. Understanding the structure-dynamics relationships in these complex materials with multiple porosities under different thermodynamical conditions remains a challenging task. In this review, we summarize the results obtained so far on experimental and theoretical studies of diffusion in micro-mesoporous materials. By considering four common classes of bi-porous materials, which are differing by the inter-connectivities of their sup-spaces as one of the most important parameter determining the transport rates, we discuss their generic transport properties and correlate the results delivered by the equilibrium and non-equilibrium techniques of diffusion measurements.

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Section: Dirk Mehlhornmentioning

confidence: 99%

Transport properties of hierarchical micro–mesoporous materials

et al. 2016

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Hierarchically‐Ordered Zeolites: A Critical Assessment

Hartmann

Thommes²,

Schwieger

2021

Adv Materials Inter

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Hierarchically‐ordered zeolites have received increasing attention in the last 15 years due to their outstanding properties, which are explored in catalytic reaction with industrial relevance. Up to now, a large number of different synthetic strategies have been reported that allow to introduce an additional meso‐ or macropore system in addition to the intrinsic microporosity of classical zeolites. Thus, hierarchical zeolites combine the intrinsic (catalytic) properties of conventional zeolites with facilitated access and transport via the additional pore system. In this critical review, the various synthesis pathways reported so far are evaluated, several physico‐chemical methods required for in‐depth characterization of the hierarchical pore system are discussed, and selective applications that are or potentially will be of technical relevance are introduced. The present review provides a critical analysis of the present achievements and discusses future opportunities and challenges for the research on hierarchically‐ordered zeolite in particular with respect to their industrial use.

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