Structural characterization of hierarchically porous alumina aerogel and xerogel monoliths

Tokudome, Yasuaki; Nakanishi, Koji; Kanamori, Kazuyoshi; Fujita, Koji; Akamatsu, Hirofumi; Hanada, Teiichi

doi:10.1016/j.jcis.2009.06.042

Cited by 96 publications

(67 citation statements)

References 29 publications

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“…The samples exhibited mesopores of 3.4 nm, macropores of 600 µm and specific surface area of 300 m 2 /g ( Figure 9). Through the same sol-gel method, Tokudome et al [66,67] investigated the formation of meso-macroporous Al 2 O 3 monoliths from aerogels and xerogels in the presence of propylene oxide and poly(ethylene oxide) (PEO). Indeed, they observed that samples with different PEO content can lead to a tailored range of pores ranging from 400 nm to 1.8 µm.…”

Section: Macrostructured Aluminasmentioning

confidence: 99%

An Overview on Zeolite Shaping Technology and Solutions to Overcome Diffusion Limitations

2018

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Synthetic zeolites are widely used as catalysts/carriers for many petrochemical reactions and in refining processes. These materials are usually synthesized in a powder form and must be shaped prior to use in industrial reactors. This review presents the state-of-the-art of the zeolite shaping technology describing the main modifications induced by the interactions between the zeolite and the binder. Additionally, a strategy is presented to overcome the diffusion limitations associated to the microporous structure of zeolites, consisting in the introduction of hierarchical porosity in the binder. Several developments in the field of hierarchical aluminas are summarized in this article, highlighting the possibility to design different ordered/disordered mesoporous and macroporous structures.

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Section: Macrostructured Aluminasmentioning

confidence: 99%

An Overview on Zeolite Shaping Technology and Solutions to Overcome Diffusion Limitations

2018

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“…22) In situ SAXS analysis revealed that aluminum hydroxide primary particles formed just after PO addition (<3 min), grew, phase-separated, and solidified (gelation in 1020 min).…”

Section: Scheme I: Hierarchically Porous (Hydr)oxidesmentioning

confidence: 99%

Aqueous synthesis of metal hydroxides with controllable nano/macro architectures

Tokudome

2017

J. Ceram. Soc. Japan

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This review briefly describes recent advances on the synthesis of metal hydroxide nanomaterials and their assembly into 3D architectures toward applications of catalysis, adsorption, and energy conversion. The discussion is mainly dedicated to the synthesis strategies toward nanohydroxide-based functional materials. A special attention is focused on two reaction schemes for the preparations of: (1) macroporous (hydr)oxides monoliths and (2) monodispersed hydroxide nanoclusters and mesoporous hydroxides.

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“…49 In these works, meso-macroporous silica gels are commonly obtained upon addition of organic additives (generally polymeric compounds and, in few cases, surfactants) to induce phase The mechanism is slightly different for some specific metal oxides (metal center, M= Ti, Al), the inorganic polymerization reactions of which are much faster than in silica-based systems. 50,51 In this case, the gel is formed by the association of nanoscale primary particles, where braod-band mesoporosity is automatically generated without removing the organic additive. Nevertheless, the nature of the metal oxide/additive interactions and the additive/solvent role are far from being clear.…”

Section: Sophorolipid/silica Interactionsmentioning

confidence: 99%

One-Step Introduction of Broad-Band Mesoporosity in Silica Particles Using a Stimuli-Responsive Bioderived Glycolipid

Thomas

Babonneau

Coradin

et al. 2013

ACS Sustainable Chem. Eng.

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Stimuli-responsive glycolipid biosurfactants belonging to the family of acidic sophorolipids (SL) have been used to introduce a broad range of pore size in the mesoscale regime (2–30 nm) in silica particles using a one-pot co-assembly sol–gel route in water. The pore size distribution is tailored by the sole interaction between an amino-modified silane, aminopropyltriethoxy silane (APTES), and SL. No additional compounds (e.g., block copolymers, polymers, organic solvents, pore-swelling agents) have been used to promote the formation of mesopores larger than 2 nm. Materials morphology and porosity have been characterized by high resolution TEM, SEM, and nitrogen physisorption, while the interaction between the glycolipid and silica is demonstrated by FT-IR and solid-state NMR.

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Structural characterization of hierarchically porous alumina aerogel and xerogel monoliths

Cited by 96 publications

References 29 publications

An Overview on Zeolite Shaping Technology and Solutions to Overcome Diffusion Limitations

An Overview on Zeolite Shaping Technology and Solutions to Overcome Diffusion Limitations

Aqueous synthesis of metal hydroxides with controllable nano/macro architectures

One-Step Introduction of Broad-Band Mesoporosity in Silica Particles Using a Stimuli-Responsive Bioderived Glycolipid

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