Determining the specific surface area of ceramic foams: The tetrakaidecahedra model revisited

Inayat, Amer; Freund, Hannsjörg; Zeiser, Thomas; Schwieger, Wilhelm

doi:10.1016/j.ces.2010.12.031

Cited by 129 publications

(118 citation statements)

References 27 publications

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“…122 , 124 , 127 ] Recently, we have presented a new correlation (based on tetrakaidecahedron geometry) for the prediction of the specifi c surface area of solid ceramic foams. [ 125 ] The correlation takes into account the different strut morphologies of foam structures and uses only two Pressure drop: The relatively low pressure drop is another important property of foam matrices for catalyst supports as it allows for a high space velocity in the reactor. [ 122 , 123 ] In the literature many authors have studied pressure drop in foam structures presenting different correlations (based on certain geometrical model) for the pressure drop estimation.…”

Section: Solid Foam Monoliths As Supports For Zeolite Catalystsmentioning

confidence: 99%

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Zeolitic Materials with Hierarchical Porous Structures

et al. 2011

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During the past several years, different kinds of hierarchical structured zeolitic materials have been synthesized due to their highly attractive properties, such as superior mass/heat transfer characteristics, lower restriction of the diffusion of reactants in the mesopores, and low pressure drop. Our contribution provides general information regarding types and preparation methods of hierarchical zeolitic materials and their relative advantages and disadvantages. Thereafter, recent advances in the preparation and characterization of hierarchical zeolitic structures within the crystallites by post-synthetic treatment methods, such as dealumination or desilication; and structured devices by in situ and ex situ zeolite coatings on open-cellular ceramic foams as (non-reactive as well as reactive) supports are highlighted. Specific advantages of using hierarchical zeolitic catalysts/structures in selected catalytic reactions, such as benzene to phenol (BTOP) and methanol to olefins (MTO) are presented.

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Section: Solid Foam Monoliths As Supports For Zeolite Catalystsmentioning

confidence: 99%

“…[125][126][127] For this purpose magnifi ed images of the foam samples from different areas (e.g. top, side and bottom) are analyzed to determine the average value of pore (cell or window) and strut sizes.…”

Section: Solid Foam Monoliths As Supports For Zeolite Catalystsmentioning

confidence: 99%

Zeolitic Materials with Hierarchical Porous Structures

et al. 2011

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“…These relations are usually based on a description of the foam cells with the Weaire-Phelan unit cell, [93] an overview can be found in ref. [94] A basic approach for the calculation of the coating thickness on cellular supports approximates the cumulative strut surface S strut as planar area ("plate" model; Figure 4, right). [23] The total strut surface area can be calculated according to S strut ¼ S spec.…”

Section: Determination Of the Coating Thicknessmentioning

confidence: 99%

Reticulated Replica Ceramic Foams: Processing, Functionalization, and Characterization

et al. 2017

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Reticulated ceramic foams are used in a wide range of applications such as filters, catalyst supports, lightweight materials, energy absorptions materials, or as scaffolds for tissue engineering as the most common ones. Based on gaseous foaming processes of polymers, a stochastic distribution of closed pores is obtained. By reticulation processing thin foam windows are removed between cells turning a closed cell into an open cell structure. These foams are used as template for porous ceramics manufacturing: With different processing approaches, for example, with dip coating of a ceramic slurry and a subsequent (multistep) thermal treatment ceramic reticulate foams are obtained. A variety of material properties strongly depend on the cell and strut size, as well on material composition. Functionalization of ceramic foam surfaces (outer surface functionalization), for example, with zeolites or nanosized aggregates lead to an increase of the specific surface area or provides catalytic or heat storage functionality. Filling of struts (inner surface functionalization) may lead to improved mechanical stability or may provide functionalities such as electric conductivity. The present work summarizes the processing steps from the template foam to the final cellular ceramic, functionalization strategies, and the most common characterization techniques.

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“…There are numerous methods of solid foam characterization, e.g., X-ray computer tomography (CT) [3][4][5], magnetic resonance imaging (MRI) [6], or microscopic methods [3,7]. The foam geometry can be modeled as a regular structure based on theoretical models like the cubic cell or Kelvin cell (for details see [5]) or as a real structure based on the CT reconstruction of real foam scans.…”

Section: Introductionmentioning

confidence: 99%

“…The foam geometry can be modeled as a regular structure based on theoretical models like the cubic cell or Kelvin cell (for details see [5]) or as a real structure based on the CT reconstruction of real foam scans. One of the methods of foam geometry reconstruction is the use of algorithms based on Voronoi tessellations (e.g., [8]).…”

Section: Introductionmentioning

confidence: 99%

In Search of Governing Gas Flow Mechanism through Metal Solid Foams

et al. 2017

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Solid foams have been intensely studied as promising structured catalytic internals. However, mechanisms governing flow and transport phenomena within the foam structures have not been properly addressed in the literature. The aim of this study was to consider such flow mechanisms based on our experimental results on flow resistance. Two mechanisms were considered: developing laminar flow in a short capillary channel (flow-through model), and flow around an immersed solid body, either a cylinder or sphere (flow-around model). Flow resistance experiments were performed on three aluminum foams of 10, 20, and 40 PPI (pores per inch), using a 57 mm ID test column filled with the foams studied. The foam morphology was examined using microtomography and optical microscopy to derive the geometric parameters applied in the model equations. The flow-through model provided an accuracy of 25% for the experiments. The model channel diameter was the foam cell diameter, and the channel length was the strut thickness. The accuracy of the flow-around model was only slightly worse (35%). It was difficult to establish the geometry of the immersed solid body (sphere or cylinder) because experiment characteristics tended to change from sphere to cylinder with increasing PPI value.

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Determining the specific surface area of ceramic foams: The tetrakaidecahedra model revisited

Cited by 129 publications

References 27 publications

Zeolitic Materials with Hierarchical Porous Structures

Zeolitic Materials with Hierarchical Porous Structures

Reticulated Replica Ceramic Foams: Processing, Functionalization, and Characterization

In Search of Governing Gas Flow Mechanism through Metal Solid Foams

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