Hierarchical porous catalyst support: shaping, mechanical strength and catalytic performances

Ould‐Chikh, Samy; Pavan, Sophie; Fécant, Antoine; Trela, Emmanuelle; Verdon, C.; Gallard, Anthony; Crozet, Nathalie; Loubet, Jean‐Luc; Hémati, Mehrdji; Rouleau, Loı̈c

doi:10.1016/s0167-2991(10)75024-2

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…Catalyst supports, commonly made of aluminum oxide, silicon dioxide, and titanium dioxide, play a critical role in catalytic process design as they provide a stable and effective surface for the catalytic reactions to occur. The choice of the support material for the catalyst and shape is crucial as it can affect the activity, selectivity, and stability of the catalyst [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

A Model for the Flow Distribution in Dual Cell Density Monoliths

Reinao

Cornejo

2023

Processes

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Monoliths are promising as catalytic structured supports due to their many operational advantages. Compared to pellets, monoliths offer low backpressure and good heat distribution, even at high flow rates. There is interest in the industry for improving temperature control in highly exothermic systems, such as the catalytic hydrogenation of CO2 for e-fuels synthesis. In this context, novel substrate shapes, such as non-homogeneous cell density monoliths, show good potential; however, to date, they have only been sparsely described. This work focuses on a dual cell density substrate and uses a computational model of a straight-channel monolith with two concentric regions to analyze its flow distribution. The central (core) and peripheral (ring) regions of the substrate differ in cell density in order to obtain a non-homogeneous cross-section. The model is validated against classical data in the literature and theoretical equations. Then, the flow fraction passing through each region of the substrate is registered. Several flow rates, core sizes and combinations of apparent permeabilities are tested. According to the results, the flow distribution depends only on the monolith geometrical features and not on the flow rate. A model for this phenomenon is proposed. The model accurately predicted the flow fraction passing through each region of the monolith for all the cases analyzed.

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Section: Introductionmentioning

confidence: 99%

A Model for the Flow Distribution in Dual Cell Density Monoliths

Reinao

Cornejo

2023

Processes

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“…Porous materials have attracted wide attention because of their useful functionalities and microstructures for various applications in including catalytic supports, thermal insulators, sound absorbers, adsorbents, energy materials, and separation membranes [1][2][3][4][5][6]. For several decades, the synthesis routes of porous materials have typically involved chemical approaches, such as the hydrothermal method, sol-gel method, and gasphase synthesis like the spray pyrolysis method [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Oil Adsorption Capacity by Aerogel Powder Synthesized Using Emulsion Droplets as Micro-reactors in Ambient Conditions from Sodium Silicate as Precursor

Cho¹,

Sung²,

Woo³

et al. 2021

Korean J. Met. Mater.

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In this study, silica aerogel particles were synthesized from emulsion droplets as micro-reactors at room temperature under ambient pressure. An economical precursor, sodium silicate, was used as the starting material for silica, and an emulsification technique was applied to form droplets in continuous phase. By controlling the composition of the dispersed phase using ammonium hydroxide, the effect of pH on the morphologies of the final aerogel particles was studied by SEM observation. As a demonstrative application, hydrophobic silica aerogel particles were produced by modification using a silane coupling agent, for oil adsorption. The amount of oil adsorbed by the aerogel particles was optimized by adjusting the concentration of precursors in the emulsion droplets, the composition of the dispersed phase, and the concentration of the coupling agent during surface treatment of the particles. The resulting aerogel particles were characterized using BET, TGA, and the contact angle of water droplets after modification using silane coupling agents with different carbon numbers. The optimized value of adsorbed silicone oil (100 CS) was measured to be about 250 % relative to the weight of the aerogel particles. For comparison, other types of porous silica particles were also prepared from emulsion-assisted self-assembly routes to quantify the amount of adsorbed oil.

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“…However, a deep study of the deposition conditions of thin layers of bohemite on a substrate with spherical geometry has not been reported yet. Besides, few papers investigate the catalytic performance of bimetallic catalysts supported on γ‐Al 2 O 3 deposited on α‐Al 2 O 3 spheres …”

Section: Introductionmentioning

confidence: 99%

Synthesis of spherical structured catalysts by dip‐coating: Application to n‐butane dehydrogenation

2017

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This work analyzes the deposition conditions of thin layers of γ‐Al2O3 by dip‐coating on a spherical substrate of α‐Al2O3 spheres. Results showed that under controlled deposition conditions, a structured support of α‐Al2O3 spheres coated by a uniform γ‐Al2O3 layer (thickness ≈ 15 µm) of good adherence can be attained. Optimal preparation conditions for the coating, that involved pretreatment of the substrate, gel formation, deposition conditions, and thermal treatments, were obtained. Pt catalysts supported on this structured material can be used as promising dehydrogenation systems. In this sense, a monometallic structured catalyst showed both good metallic dispersion and catalytic performance in n‐butane dehydrogenation reaction compared to another conventional catalytic system.

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Hierarchical porous catalyst support: shaping, mechanical strength and catalytic performances

Cited by 7 publications

References 6 publications

A Model for the Flow Distribution in Dual Cell Density Monoliths

A Model for the Flow Distribution in Dual Cell Density Monoliths

Optimization of Oil Adsorption Capacity by Aerogel Powder Synthesized Using Emulsion Droplets as Micro-reactors in Ambient Conditions from Sodium Silicate as Precursor

Synthesis of spherical structured catalysts by dip‐coating: Application to n‐butane dehydrogenation

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