Heterogeneously Catalyzed Processes with Porous Cellular Ceramic Monoliths

Scheffler, Franziska; Claus, Peter; Schimpf, Sabine; Lucas, Martin; Scheffler, Michael

doi:10.1002/3527606696.ch5d

Cited by 16 publications

(27 citation statements)

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“…radial mass flow, radial heat exchange and tortuosity, which are present in packed bed configurations to a fair extent. 124 Solid opencell foams (also referred to as 'sponges') on the other hand tend to combine the advantages of packed beds and honeycombs, as they offer low pressure drop combined with radial heat and mass transfer. Therefore, among different consolidated catalyst supports, solid open-cell foams are gaining more and more importance.…”

Section: Zeolites On Consolidated (Structured) Supports Via Coatingmentioning

confidence: 99%

“…Therefore, among different consolidated catalyst supports, solid open-cell foams are gaining more and more importance. 122,124 While replication techniques lead to consolidated monolithic structures (foams) with rather irregular pore geometry and broad distribution of pore size and solid material, additive manufacturing techniques nowadays offer the possibility to tailor the 3D structure of such monoliths. In this way, highly periodic open-cellular structures (POCS) can be precisely designed to the requirements of the target application.…”

Section: Zeolites On Consolidated (Structured) Supports Via Coatingmentioning

confidence: 99%

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Hierarchy concepts: classification and preparation strategies for zeolite containing materials with hierarchical porosity

et al. 2016

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'Hierarchy' is a property which can be attributed to a manifold of different immaterial systems, such as ideas, items and organisations or material ones like biological systems within living organisms or artificial, man-made constructions. The property 'hierarchy' is mainly characterised by a certain ordering of individual elements relative to each other, often in combination with a certain degree of branching.Especially mass-flow related systems in the natural environment feature special hierarchically branched patterns. This review is a survey into the world of hierarchical systems with special focus on hierarchically porous zeolite materials. A classification of hierarchical porosity is proposed based on the flow distribution pattern within the respective pore systems. In addition, this review might serve as a toolbox providing several synthetic and post-synthetic strategies to prepare zeolitic or zeolite containing material with tailored hierarchical porosity. Very often, such strategies with their underlying principles were developed for improving the performance of the final materials in different technical applications like adsorptive or catalytic processes. In the present review, besides on the hierarchically porous allzeolite material, special focus is laid on the preparation of zeolitic composite materials with hierarchical porosity capable to face the demands of industrial application.

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Section: Zeolites On Consolidated (Structured) Supports Via Coatingmentioning

confidence: 99%

Section: Zeolites On Consolidated (Structured) Supports Via Coatingmentioning

confidence: 99%

Hierarchy concepts: classification and preparation strategies for zeolite containing materials with hierarchical porosity

et al. 2016

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“…[2]) and conservation of momentum (Eq. [3]). [34][35][36][37][38] (2) Porous region-continuity equation (Eq.…”

Section: A Experimental Proceduresmentioning

confidence: 99%

“…[1][2][3][4] In general, solid foams can be divided into open and closed cell materials, where each material has a different structure, property, and application. [2,5,6] Depending on the type and production method, ceramic foams may possess adequately high mechanical properties such as high thermal and chemical resistance, high structural uniformity, and strength.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fluid Bypassing on the Experimentally Obtained Darcy and Non-Darcy Permeability Parameters of Ceramic Foam Filters

Akbarnejad

Pour

Jonsson

et al. 2016

Metall Mater Trans B

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SHAHIN AKBARNEJAD, MOHSEN SAFFARI POUR, LAGE TORD INGEMAR JONSSON, and PÄ R GÖ RAN JÖ NSSONCeramic foam filters (CFFs) are used to remove solid particles and inclusions from molten metal. In general, molten metal which is poured on the top of a CFF needs to reach a certain height to build the required pressure (metal head) to prime the filter. To estimate the required metal head, it is necessary to obtain permeability coefficients using permeametry experiments. It has been mentioned in the literature that to avoid fluid bypassing, during permeametry, samples need to be sealed. However, the effect of fluid bypassing on the experimentally obtained pressure gradients seems not to be explored. Therefore, in this research, the focus was on studying the effect of fluid bypassing on the experimentally obtained pressure gradients as well as the empirically obtained Darcy and non-Darcy permeability coefficients. Specifically, the aim of the research was to investigate the effect of fluid bypassing on the liquid permeability of 30, 50, and 80 pores per inch (PPI) commercial alumina CFFs. In addition, the experimental data were compared to the numerically modeled findings. Both studies showed that no sealing results in extremely poor estimates of the pressure gradients and Darcy and non-Darcy permeability coefficients for all studied filters. The average deviations between the pressure gradients of the sealed and unsealed 30, 50, and 80 PPI samples were calculated to be 57.2, 56.8, and 61.3 pct. The deviations between the Darcy coefficients of the sealed and unsealed 30, 50, and 80 PPI samples found to be 9, 20, and 31 pct. The deviations between the non-Darcy coefficients of the sealed and unsealed 30, 50, and 80 PPI samples were calculated to be 59, 58, and 63 pct.

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“…La fabricación de espumas de vidrio de poro cerrado, que comienza alrededor de 1930, se divide en dos métodos: a) la mezcla de polvo fino de vidrio y un agente espumante (2-4) que se consolidan y se tratan térmicamente; y b) el paso de un gas (CO 2 , aire, vapor de agua) en una masa de vidrio fundido (5,6). La espuma de vidrio resultante es un material ligero, rígido, aislante térmico y acústico (7), resistente al agua, a los agentes químicos, las bacterias y no inflamable (8). Cuando se emplea la vía de la mezcla de polvos, seguida de su consolidación y calentamiento del compacto obtenido, las propiedades finales de la espuma van a depender de la viscosidad de la fase líquida (5) que se obtenga, el mecanismo de espumación del agente espumante (descomposición de carbonatos, reacción de oxidación con la atmósfera, etc), el tamaño inicial de las partículas de vidrio y el ciclo de calentamiento.…”

Section: Introductionunclassified

Caracterización de espumas de pizarra con adiciones de clínquer de cemento

Cambronero¹,

Ruiz‐Román²,

Ruiz‐Prieto³

2007

Bol. Soc. Esp. Ceram. Vidr.

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La descomposición de los componentes de la Pizarra durante su calentamiento en condiciones no oxidantes conduce a la obtención de espumas. Así, mediante la compactación en matriz a 80MPa de polvos de Pizarra de menos de 80 µm de tamaño de partícula y con adición de un aglomerante, se obtiene una densidad en verde próxima a 1,8 g/cm 3 . El calentamiento de estos compactos en atmósfera de N 2 -5% H 2 permite alcanzar densidades de 2,2 g/cm 3 a 1100ºC , mientras que a 1150ºC la espumación del compacto conduce a densidades inferiores a 0,4 g/cm 3 . La adición de Clínquer de cemento Portland (5% y 10% en peso) modifica la densidad de la espuma a 1150ºC , teniendo que elevarse la temperatura de sinterización a 1175 ºC para alcanzarse espumas con densidades próximas a 0,4 g/cm 3 con un 10% de Clínquer. Estas espumas con Clínquer presentan un elevado tamaño de poro, así como una resistencia a compresión en el intervalo de resistencias de los vidrios espumados: 0,4-1,5MPa. Palabras clave: Pizarras, Clínquer, vidrio espumado. Characterization of slate foams with portland clinker additionsThe decomposition of constituents of slates under non-oxidizing atmosphere leads to the manufacturing of foams. Thus die pressing at 80MPa of slates powders (particle size <80 microns) mixed with a solid agglomerate, allows a green density close to 1,8 g/cm 3 . The heating of compacts under N 2 -5%H 2 atmosphere allows to reach a final density of 2,2 g/cm 3 at 1050ºC, meanwhile at 1150ºC the compact foaming leads to densities lower than 0,4 g/cm 3 . Clínquer addition (5% and 10%) modifies the foam density and pore size at 1150ºC. It is necessary to increase the sintering temperature up to 1175ºC to achieve densities close to 0,4 g/cm 3 when a 10% of Clínquer is added. The foams with Clínquer shows a high pore size and a compression strength within the range of glass foams: 0.4-1.5MPa.

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Heterogeneously Catalyzed Processes with Porous Cellular Ceramic Monoliths

Cited by 16 publications

References 0 publications

Hierarchy concepts: classification and preparation strategies for zeolite containing materials with hierarchical porosity

Hierarchy concepts: classification and preparation strategies for zeolite containing materials with hierarchical porosity

Effect of Fluid Bypassing on the Experimentally Obtained Darcy and Non-Darcy Permeability Parameters of Ceramic Foam Filters

Caracterización de espumas de pizarra con adiciones de clínquer de cemento

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