Bimodally-porous alumina with tunable mesopore and macropore for efficient organic adsorbents

Im, Eunmi; Seo, Ho Jun; Kim, Da In; Hyun, Dong Choon; Moon, Geon Dae

doi:10.1016/j.cej.2021.129147

Cited by 22 publications

(9 citation statements)

References 44 publications

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“…A ring‐like FFT pattern confirms the polycrystalline nature, in which the interplanar distances are 0.224, 0.196, and 0.140 nm, corresponding to the (222), (400), and (440) planes of Al 2 O 3 , respectively. Therefore, it is evidenced that the particles in the solution are Al(OH) 3 which transforms into Al 2 O 3 due to the electron‐beam heating 43 since much research has shown that Al(OH) 3 can transform into Al 2 O 3 under high temperatures 44,45 . It is worth noting that in the second stage, the Ni 2+ concentration also decreases.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Ni‐Al layered double hydroxide via coprecipitation: Formation mechanism, synthesis intensification, and catalytic application

Xue

Zhang

et al. 2022

AIChE Journal

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Herein, the formation mechanism of Ni-Al layered double hydroxide (NiAl-LDH) synthesized by coprecipitation was explored. Moreover, NiAl-LDH was prepared in a rotating packed bed (RPB) under different rotation speeds, which shows that increasing the rotation speed decreases the lateral size and thickness of NiAl-LDH, since high rotation speed accelerates the nucleation of NiAl-LDH. Additionally, the Ni/mixed metal oxides (MMO) catalysts derived from NiAl-LDH were prepared for maleic anhydride (MA) hydrogenation. Result shows that Ni/MMO catalyst obtained from NiAl-LDH prepared under a higher rotation speed exhibits higher MA conversion due to its larger surface area and smaller nickel particle size. The Ni/MMO catalyst obtained from NiAl-LDH prepared under 500 rpm exhibits 100% MA conversion and 100% succinic anhydride selectivity under 30 C and 2 MPa within 1 h. This work provides fundamental insight to understand the formation of NiAl-LDH. Moreover, RPB as an effective technique to synthesize NiAl-LDH and Ni-based catalysts was validated.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Ni‐Al layered double hydroxide via coprecipitation: Formation mechanism, synthesis intensification, and catalytic application

Xue

Zhang

et al. 2022

AIChE Journal

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“…The numerous meso-pores and smaller number of macro-pores in the FAA would be expected to promote its functioning as an adsorbent by providing pathways for the efficient transport of molecules. 25 …”

Section: Materials and Experimentsmentioning

confidence: 99%

Enhanced phosphate removal with fine activated alumina synthesized from a sodium aluminate solution: performance and mechanism

Liu

et al. 2022

RSC Adv.

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“…6−10 Some methods have been developed to control the preparation of hierarchical porous alumina ceramics, such as bulk casting with capillary suspensions, 11 direct foaming, 12,13 emulsion, 14−16 and sacrificial template methods. 17 However, these methods have difficulty in constructing complex three-dimensional (3D) shapes and precisely controlling the pore size or morphology due to time-consuming multistep processing. Therefore, it is still a high challenge to prepare hierarchical porous ceramics.…”

Section: Introductionmentioning

confidence: 99%

“…Hierarchical porous alumina ceramics have attracted lots of attentions due to unique multifunctionality and mechanical efficiency for wide application in catalysts, filters, bioreactors, bone substitutes, thermal insulation materials, and so on . As is well-known, the performance of hierarchical porous ceramics is mainly determined by pore size, pore orientation, and open/closed porosity. − Some methods have been developed to control the preparation of hierarchical porous alumina ceramics, such as bulk casting with capillary suspensions, direct foaming, , emulsion, − and sacrificial template methods . However, these methods have difficulty in constructing complex three-dimensional (3D) shapes and precisely controlling the pore size or morphology due to time-consuming multistep processing.…”

Section: Introductionmentioning

confidence: 99%

Tunable Size of Hierarchically Porous Alumina Ceramics Based on DIW 3D Printing Supramolecular Gel

Yang

Guan

Zhen

et al. 2022

ACS Appl. Mater. Interfaces

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A new three-dimensional (3D) printing gel is developed to construct hierarchically porous ceramics with adjustable millimeter-, micrometer-, and nanometer-scale size for application in thermal management. Not only does the gel based on supramolecular micelles exhibit excellent DIW 3D printability but also the supramolecular micelles act as templates that can precisely control the structure of micrometer-scale pores. The effect of millimeter-and μmicrometer-scale size on properties of porous ceramics is investigated in detail. The 3D-printed ceramic foam with millimeter-scale pores and smaller micrometer-scale pores shows better thermal insulation and lower compressive strength. For the thermal insulation, the local temperature of a chip exposed to contact heat is only 34.2 °C in the presence of a printed foam cap with a pore size of 41.5 μm, while the local temperature is 54.8 °C in the absence of the printed foam cap. The study provides a new method to construct hierarchically porous alumina ceramics with precisely tunable size, avoiding the issues of subtractive manufacturing and opening up new applications in portable devices or consumer electronics.

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Bimodally-porous alumina with tunable mesopore and macropore for efficient organic adsorbents

Cited by 22 publications

References 44 publications

Synthesis of Ni‐Al layered double hydroxide via coprecipitation: Formation mechanism, synthesis intensification, and catalytic application

Synthesis of Ni‐Al layered double hydroxide via coprecipitation: Formation mechanism, synthesis intensification, and catalytic application

Enhanced phosphate removal with fine activated alumina synthesized from a sodium aluminate solution: performance and mechanism

Tunable Size of Hierarchically Porous Alumina Ceramics Based on DIW 3D Printing Supramolecular Gel

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