Sol-Gel and Porous Glass-Based Silica Monoliths with Hierarchical Pore Structure for Solid-Liquid Catalysis

This work draws attention to both prospects and challenges for silica monoliths in solid‐liquid catalysis at ultrahigh efficiency. The fundamental advantages of silica monoliths as support structure over particulate fixed beds and organic‐polymer monoliths are illustrated as well as recent applicati...

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Bibliographic Details
Published in:Chemie ingenieur technik 2016-11, Vol.88 (11), p.1561-1585
Main Authors: Enke, Dirk, Gläser, Roger, Tallarek, Ulrich
Format: Article
Language:English
Subjects:
Catalysis
Contact time
Fixed beds
Mass transfer limitations
Monolithic flow microreactors
Morphology-transport relationships
Porosity
Residence time distribution
Silica glass
Silicon dioxide
Sol gel process
Structural hierarchy
Supports
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Summary:This work draws attention to both prospects and challenges for silica monoliths in solid‐liquid catalysis at ultrahigh efficiency. The fundamental advantages of silica monoliths as support structure over particulate fixed beds and organic‐polymer monoliths are illustrated as well as recent applications as flow‐through microreactors for the production of fine chemicals. Preparation routes to sol‐gel and porous glass‐based silica monoliths featuring a hierarchical pore structure are described and their potential use as short‐contact‐time reactors is highlighted together with a view on the multiscale characterization and their rational design by establishing quantitative synthesis‐morphology‐transport relationships. Monolithic support structures are abundantly used in high‐throughput catalysis. Compared to fixed beds of small or large fully porous or core‐shell particles, silica monoliths with hierarchical pore structure boost the design space spanned by hydraulic permeability, heat/mass transfer resistance, and adsorption/reaction capacity.
ISSN:0009-286X
1522-2640
DOI:10.1002/cite.201600049