Potential for metal foams to act as structured catalyst supports in fixed-bed reactors

Kolaczkowski, S.T.; Awdry, Serpil; Smith, Tony; Thomas, Dave; Torkuhl, Lars; Kolvenbach, Robin

doi:10.1016/j.cattod.2016.03.047

Cited by 49 publications

(24 citation statements)

References 14 publications

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“…[1,2]. Instead of using a single block of porous foam structure, catalytic foam particles/ pellet provide additional modularity for loading and unloading during maintenance, as-well-as during catalyst preparation [1,3]. Different combinations of particle size and column diameter can be used to form slender packed beds of different porosities using same foam sample supplied from the foam manufacturer.…”

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confidence: 99%

Multiscale modeling of fixed-bed reactors with porous (open-cell foam) non-spherical particles: Hydrodynamics

Das

Deen

Kuipers

2018

Chemical Engineering Journal

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A B S T R A C TAn accurate numerical model is proposed to simulate flow through cylindrical fixed-bed reactors with randomly packed porous non-spherical particles. The length scale for flow outside the porous particles (made of open-cell foam) is O (10 ) 2 higher than the size of the internal micro-pores of the particles. To capture the flow at these two different length scales, a multiscale modeling approach, derived using volume averaging theory (VAT), is developed. The flow through and around the porous particles is computed as a single hydrodynamic field in a Cartesian computational domain. The flow within the inter-particle space is fully resolved, whereas, flow at the scale of the intra-particle micro-pores is not resolved and instead represented by closure terms. Random packings of cubic and cuboid particles in cylindrical columns of different diameter are generated using a glued-sphere Discrete Element Method (DEM) approach. The packing structures for different particle-column combinations are analysed. The effects of particle size/shape, column diameter and internal porosity of the particles on the overall pressure drop and flow distribution are investigated. The macroscopic Reynolds number (based on the particle equivalent diameter and the superficial velocity of the bed) is varied from 0.1 to 400. The effect of Reynolds number on pressure drop is analyzed, as well as the reduction in pressure drop due to the presence of the intra-particle pores. In addition, our numerical simulations have helped to elucidate the detailed fluid-solid interaction in complex bi-disperse, dual porosity porous media.

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confidence: 99%

Multiscale modeling of fixed-bed reactors with porous (open-cell foam) non-spherical particles: Hydrodynamics

Das

Deen

Kuipers

2018

Chemical Engineering Journal

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“…In addition to these polymeric foams, closed‐cellular aluminum foams such as Alporas (Shinko Wire, Japan) and Alulight (Ecka Granules, Austria) have successfully been developed for lightweight structural components or crash energy absorbers in mechanical engineering and transport industries. [3b,c] Open‐cellular metallic foams have also found a variety of practical applications,[3b,c] such as electrodes for batteries, biomedical implants, catalyst supports, and heat exchangers . As discussed in Section , recent advances in multiscale architecturing strategies have led to the generation of functional ultra‐lightweight materials endowed with well‐designed properties, making them useful for a variety of next‐generation technologies.…”

Section: Applications Of Ultra‐lightweight Materialsmentioning

confidence: 99%

Structurally Controlled Cellular Architectures for High‐Performance Ultra‐Lightweight Materials

Yeo

Yoo

2018

Advanced Materials

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.201803670.The design and synthesis of cellular structured materials are of both scientific and technological importance since they can impart remarkably improved material properties such as low density, high mechanical strength, and adjustable surface functionality compared to their bulk counterparts. Although reducing the density of porous structures would generally result in reductions in mechanical properties, this challenge can be addressed by introducing a structural hierarchy and using mechanically reinforced constituent materials. Thus, precise control over several design factors in structuring, including the type of constituent, symmetry of architectures, and dimension of the unit cells, is extremely important for maximizing the targeted performance. The feasibility of lightweight materials for advanced applications is broadly explored due to recent advances in synthetic approaches for different types of cellular architectures. Here, an overview of the development of lightweight cellular materials according to the structural interconnectivity and randomness of the internal pores is provided. Starting from a fundamental study on how material density is associated with mechanical performance, the resulting structural and mechanical properties of cellular materials are investigated for potential applications such as energy/mass absorption and electrical and thermal management. Finally, current challenges and perspectives on high-performance ultra-lightweight materials potentially implementable by well-controlled cellular architectures are discussed. Lightweight Materials

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“…structured catalysts. In the last decades, structured catalysts have been extensively studied, as profitable alternatives to the traditional powder and pellets catalysts, providing better performance in terms of pressure drops (thus decreasing the energy costs of operation and increasing the lifetime of the catalyst) [19] and heat and mass transfer [20]. In this regard, the development of highly efficient structured catalysts allow processes to be operated in a continuous mode, thus avoiding the barrier towards scaling up [21].…”

Section: Introductionmentioning

confidence: 99%

Ceria-coated replicated aluminium sponges as catalysts for the CO-water gas shift process

Palma

Goodall

Thompson

et al. 2021

International Journal of Hydrogen Energy

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Potential for metal foams to act as structured catalyst supports in fixed-bed reactors

Cited by 49 publications

References 14 publications

Multiscale modeling of fixed-bed reactors with porous (open-cell foam) non-spherical particles: Hydrodynamics

Multiscale modeling of fixed-bed reactors with porous (open-cell foam) non-spherical particles: Hydrodynamics

Structurally Controlled Cellular Architectures for High‐Performance Ultra‐Lightweight Materials

Ceria-coated replicated aluminium sponges as catalysts for the CO-water gas shift process

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