New Aluminosilicate Materials with Hierarchical Porosity Generated by Aerosol Process

Chaumonnot, Alexandra; Tihay, F.; Coupé, Aurélie; Pega, Stéphanie; Boissière, Cédric; Grosso, David; Sánchez, C.

doi:10.2516/ogst/2009029

Cited by 18 publications

(11 citation statements)

References 26 publications

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“…As an example it has been shown for CTAB-silica aqueous solutions that the presence of residual alkoxy groups induces a decrease of the radius of the rods that constitute the hexagonal mesophases and consequently a decrease of the reticular distances measured by SAXS. [ 105 ] In basic media , the aerosol processing of mesostructured microspheres from surfactant-silica or surfactant-aluminosilicate sols is not straightforward for several reasons: i) the low time window stability for CTAB-Silica sols, ii) the interactions misfi t between the polar heads of non ionic surfactants such as Brij and Pluronic derivatives and the negatively charged metal-oxo oligomers which yield a rapid spinoidal decomposition [ 114 ] that drives down the more delicate selfassembly driven meso-organisation process. However, very recently a strategy using an alkyl ammonium (TPAOH) assisted pluronic (F127) templating and the control of the kinetics of condensation through the tuning of pH and Al/ Si ratio led to new mesoporous aluminosilicates labelled as Large pore size Aluminosilicates performed in Basic medium, (LAB) with excellent catalytic acidic properties.…”

Section: Main Chemical and Processing Parameters Controlling Structurmentioning

confidence: 99%

Aerosol Route to Functional Nanostructured Inorganic and Hybrid Porous Materials

Boissière¹,

Grosso²,

Chaumonnot³

et al. 2010

Advanced Materials

337

295

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The major advances in the field of the designed construction of hierarchically structured porous inorganic or hybrid materials wherein multiscale texturation is obtained via the combination of aerosol or spray processing with sol-gel chemistry, self-assembly and multiple templating are the topic of this review. The available materials span a very large set of structures and chemical compositions (silicates, aluminates, transition metal oxides, nanocomposites including metallic or chalcogenides nanoparticles, hybrid organic-inorganic, biohybrids). The resulting materials are manifested as powders or smart coatings via aerosol-directed writing combine the intrinsic physical and chemical properties of the inorganic or hybrid matrices with defined multiscale porous networks having a tunable pore size and connectivity, high surface area and accessibility. Indeed the combination of soft chemical routes and spray processing provides "a wind of change" in the field of "advanced materials". These strategies give birth to a promising family of innovative materials with many actual and future potential applications in various domains such as catalysis, sensing, photonic and microelectronic devices, nano-ionics and energy, functional coatings, biomaterials, multifunctional therapeutic carriers, and microfluidics, among others.

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Section: Main Chemical and Processing Parameters Controlling Structurmentioning

confidence: 99%

Aerosol Route to Functional Nanostructured Inorganic and Hybrid Porous Materials

Boissière¹,

Grosso²,

Chaumonnot³

et al. 2010

Advanced Materials

337

295

View full text Add to dashboard Cite

show abstract

“…37,51 In the typical conditions of spray-dry processing, this metastable system has been quenched before it reached the thermodynamic equilibrium, corresponding to a complete phase separation. 52 Using a TPAOH to (Si+Ti) molar ratio of 0.20, we obtained a material with a heterogeneous porosity resulting from the early transition between EISA and phase separation. This material was denoted "Aer_20".…”

Section: Preparation Of the Materialsmentioning

confidence: 99%

Aerosol route to TiO2–SiO2 catalysts with tailored pore architecture and high epoxidation activity

Smeets¹,

Boissière²,

Sánchez³

et al. 2019

Preprint

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We present the aerosol-assisted sol-gel preparation of hierarchically porous TiO2–SiO2 catalysts having a sphere-like shell morphology and a high Ti dispersion. In order to control the porosity at the micro-, meso- and macro- levels, we use the evaporation-induced self assembly (EISA) of a surfactant, possibly combined with polymer beads as hard templates. These catalysts are tested for the epoxidation of cyclohexene with cumene hydroperoxide as oxidant, and their performance is compared to the reference TS-1 zeolite. The high catalytic performance observed with the catalysts prepared by aerosol stems from their high specific surface area, but also from the short diffusion path length generated by the meso-/macro-pore architecture which provide entryways for bulky reactants and products.

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“…It has been proposed as a simple, continuous and rapid mode of production of high surface area-nanostructured materials with well-defined pore size and controllable texture [35][36][37]. This has proven highly effective for the preparation of a wide range of oxide and mixed oxide catalysts [38][39][40][41][42][43][44][45][46][47]. In this process, a stable solution of precursors and surfactants is atomized into droplets (aerosol) and processed by contact with a drying gas.…”

Section: Introductionmentioning

confidence: 99%

Aerosol-Assisted Sol-Gel Synthesis of Mesoporous TiO2 Materials, and Their Use as Support for Ru-Based Methanation Catalysts

Kim¹,

Sánchez²,

Haye³

et al. 2019

Preprint

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<div>Mesoporous TiO2 materials have been prepared by an aerosol process, which leverages on the acetic acid-mediated sol-gel chemistry and on the evaporation-induced self-assembly phenomenon to obtain materials with high specific surface area and large mesoporous volume. The obtained spherical particles are calcined to release the porosity. It is shown that the mesoscopic order can be preserved when the calcination is carried out at relatively low temperature (375 °C and below). Harsher calcination conditions lead to the progressive destruction of the mesostructured, concomitant with a progressive drop of textural properties and with the crystallization of larger anatase domains. The mesoporous TiO2 material calcined at 350°C (specific surface area = 260 m².g-1; pore volume = 0.36 cm³.-1; mean pore diameter = 5.4 nm) was selected as a promising support for preformed RuO2 nanoparticles, and subsequently annealed in air. It is shown that the presence of RuO2 nanoparticles and subsequent annealing provoke further intense modification of the texture and crystallinity of the TiO2 materials. In addition to a drop in the textural parameters, a RuO2-mediated crystallization of rutile TiO2 is highlighted at temperature as low as 250°C. After an in situ reduction in H2, the catalysts containing TiO2 rutile and relatively small RuO2 crystals showed the highest activity in the methanation of CO2. </div>

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New Aluminosilicate Materials with Hierarchical Porosity Generated by Aerosol Process

Cited by 18 publications

References 26 publications

Aerosol Route to Functional Nanostructured Inorganic and Hybrid Porous Materials

Aerosol Route to Functional Nanostructured Inorganic and Hybrid Porous Materials

Aerosol route to TiO2–SiO2 catalysts with tailored pore architecture and high epoxidation activity

Aerosol-Assisted Sol-Gel Synthesis of Mesoporous TiO2 Materials, and Their Use as Support for Ru-Based Methanation Catalysts

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