Keramische Ultradünnwandträger für zukünftige Emissionsanforderungen

Knon, Heidi; Flörchinger, Peter

doi:10.1007/bf03226594

Cited by 3 publications

(4 citation statements)

References 1 publication

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“…Monolithic packings consist of an array of parallel flow channels, and combine large specific surface areas of several 1000 m 2 /m 3 with high porosities of 80% or more [25] (see Figure 3). Usually, monolithic packings are manufactured by extrusion of a ceramic paste (hydraulic channel diameters down to 0.7 mm [26]) or by wrapping a set of straight and corrugated metal sheets (hydraulic channel diameters down to 0.6 mm [27]). Even smaller channel diameters, of 100 µm or less, can be generated by mechanical processing; by milling, for example, or by chemical processing, e.g., etching of foils which are afterwards stapled and connected by welding or bolted fastenings.…”

Section: Structuring and Miniaturization Of The Reaction Chambermentioning

confidence: 99%

Process Intensification in Chemical Reaction Engineering

2022

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Section: Structuring and Miniaturization Of The Reaction Chambermentioning

confidence: 99%

Process Intensification in Chemical Reaction Engineering

2022

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“…[87]. Ceramic structures typically contain up to 1200 cells per square inch (cpsi), i.e., hydraulic diameters down to 0.7 mm [88], whereas cell densities in metal structures may reach 1600 cpsi, i.e., channel diameters down to 0.6 mm [89].…”

Section: Minichannel Wall Reactor (Mcwr)mentioning

confidence: 99%

Reactor Selection for Upgrading Hemicelluloses: Conventional and Miniaturised Reactors for Hydrogenations

et al. 2021

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This work presents an advanced reactor selection strategy that combines elements of a knowledge-based expert system to reduce the number of feasible reactor configurations with elaborated and automatised process simulations to identify reactor performance parameters. Special focus was given to identify optimal catalyst loadings and favourable conditions for each configuration to enable a fair comparison. The workflow was exemplarily illustrated for the Ru/C-catalysed hydrogenation of arabinose and galactose to the corresponding sugar alcohols. The simulations were performed by using pseudo-2D reactor models implemented in Aspen Custom Modeler® and automatised by using the MS-Excel interface and VBA. The minichannel packings, namely wall-coated minichannel reactor (MCWR), minichannel reactor packed with catalytic particles (MCPR), and minichannel reactor packed with a catalytic open-celled foam (MCFR), outperform the conventional and miniaturised trickle-bed reactors (TBR and MTBR) in terms of space-time yield and catalyst use. However, longer reactor lengths are required to achieve 99% conversion of the sugars in MCWR and MCPR. Considering further technical challenges such as liquid distribution, packing the reactor, as well as the robustness and manufacture of catalysts in a biorefinery environment, miniaturised trickle beds are the most favourable design for a production scenario of galactitol. However, the minichannel configurations will be more advantageous for reaction systems involving consecutive and parallel reactions and highly exothermic systems.

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“…In this context, the term ultra-thin wall substrate is frequently used, but it is not unambiguously defined. In some cases, substrates with wall thicknesses below 3.5 mil are classified as ultra-thin wall, while other references define ultra-thin wall substrates with a wall thickness below 2.5 mil [33].…”

Section: Ceramic Catalyst Substratesmentioning

confidence: 99%

“…The final section of this study exemplarily tests the results gained in the previous sections and describes an adaption of the internal surface area. In detail, the internal surface area of one monolith-400 cpsi with a wall thickness of 4 mil-is set to be the reference due to its prevalent use [33]. The determining variable is the length of the monolith.…”

Section: Optimization Of Dimensions For Improved Heat-up Performancementioning

confidence: 99%

Heat-Up Performance of Catalyst Carriers—A Parameter Study and Thermodynamic Analysis

et al. 2021

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This study investigates geometric parameters of commercially available or recently published models of catalyst substrates for passenger vehicles and provides a numerical evaluation of their influence on heat-up behavior. Parameters considered to have a significant impact on the thermal economy of a monolith are: internal surface area, heat transfer coefficient, and mass of the converter, as well as its heat capacity. During simulation experiments, it could be determined that the primary role is played by the mass of the monolith and its internal surface area, while the heat transfer coefficient only has a secondary role. Furthermore, an optimization loop was implemented, whereby the internal surface area of a commonly used substrate was chosen as a reference. The lengths of the thin wall and high cell density monoliths investigated were adapted consecutively to obtain the reference internal surface area. The results obtained by this optimization process contribute to improving the heat-up performance while simultaneously reducing the valuable installation space required.

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Keramische Ultradünnwandträger für zukünftige Emissionsanforderungen

Cited by 3 publications

References 1 publication

Process Intensification in Chemical Reaction Engineering

Process Intensification in Chemical Reaction Engineering

Reactor Selection for Upgrading Hemicelluloses: Conventional and Miniaturised Reactors for Hydrogenations

Heat-Up Performance of Catalyst Carriers—A Parameter Study and Thermodynamic Analysis

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