Template-free synthesis of AlPO4-H1, -H2, and -H3 by microwave heating

Kunii, Katsuyuki; Narahara, Kazuhiro; Yamanaka, Shōji

doi:10.1016/s1387-1811(02)00314-1

Cited by 18 publications

(9 citation statements)

References 35 publications

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“…More recently Kunii et al 18 reported the synthesis of AlPO 4 -H 1 , -H 2 and -H 3 via microwave heating of aluminophosphate gels made up of different kinds of aluminum sources, namely amorphous aluminum hydroxide, gibbsite, and boehmite. More specifically, the authors were able to produce pure AlPO 4 -H 1 , -H 2 , and -H 3 , by crystallizing gels at 125, 118, and 90 °C containing aluminum hydroxide, gibbsite, and boehmite, respectively.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Hydrated Aluminum Phosphate, AlPO₄·1.5H₂O (AlPO₄−H₃), by Controlled Reactive Crystallization in Sulfate Media

Lagno

Demopoulos

2005

Ind. Eng. Chem. Res.

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A new method for the synthesis of hydrated aluminum phosphate, AlPO4·1.5H2O, in a semibatch reactor is reported. The synthesis involves direct reactive crystallization induced by pH adjustment to a predetermined supersaturation level. Precipitation was conducted in sulfate-based solutions with Al(III):P(V) molar ratio of 1 and at 95 °C. Homogeneous precipitation tests led to the definition of the metastable zone of aluminum phosphate. This zone was used to design the supersaturation-controlled seeded test. XRD, TGA, and chemical analysis confirmed the product to be AlPO4·1.5H2O. SEM and particle size analysis revealed the product to consist of aggregates of submicron-size crystallites of 3.5 μm average size (homogeneously formed product) grown to 16.5 μm after three cycles of seeded crystallization.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Hydrated Aluminum Phosphate, AlPO₄·1.5H₂O (AlPO₄−H₃), by Controlled Reactive Crystallization in Sulfate Media

Lagno

Demopoulos

2005

Ind. Eng. Chem. Res.

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“…Normally, α alumina has a sphere shape, but, the formation of parti- cle with needle-like shape as observed in the present case maybe due to the forces arising from phosphorous [16] and silicon [17] present in the yeasts. Phosphorous promotes the growth whereas silicon prevents the growth, but the percentage contribution of each of these is not well understood at this stage.…”

Section: B Effect Of Heat Treatment On the Microporous Structurementioning

confidence: 54%

Fabrication of bimodal (meso/macro) porous alumina materials using yeast cells as templates

Towata

Manickam

Yasui

et al. 2005

e-J. Surf. Sci. Nanotech.

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Bimodal (meso/macro) porous alumina materials were synthesized using yeast cells as bio-templates. Aluminium isopropoxide (AIP) modified with triethanolamine (TEA) was first hydrolyzed by water containing the dispersed yeast cells. This resulted in the formation of slurry consisting of hydrolyzed sol and yeast cells. After centrifuging the solution, the obtained cake which is packed with hydrated sol and yeast cells was subjected to heat treatment. The sample after heat treatment contained finely dispersed bimodal (meso/ macro) pores ranging in size from 1.5 to 2.0 µm and several nm. Under the present experimental conditions, the thickness of alumina wall was also controlled by changing the ratio of yeast cells to AIP. It was also observed that with an increase in the thickness of the wall, the size of the pores decreased.

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“…The wide channels of VPI-5 serve as effective catalyst supports and can adsorb molecules as large as triisopropyl benzene (diameter 13 Å). It is known that VPI-5 is isostructural with AlPO 4 -H1, which was prepared about 40 years ago by d'Yvoire. , In contrast to the synthesis of VPI-5, AlPO 4 -H1 was synthesized conveniently without any organic template via a microwave process …”

Section: Introductionmentioning

confidence: 99%

“…14,15 In contrast to the synthesis of VPI-5, AlPO 4 -H1 was synthesized conveniently without any organic template via a microwave process. 16 Accordingly, the latter synthesis can be more easily adapted to introduce functional groups into zeolitic frameworks.…”

Section: Introductionmentioning

confidence: 99%

Functionalization of Aluminophosphate AlPO₄-H1 (VPI-5) with Phenylphosphonic Acid

Hagaman

Dai

2004

Chem. Mater.

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Zeolites and related substances, such as aluminophosphates with periodic three-dimensional framework structures which contain pores, have attracted much scientific interest for applications in chemical separation, shape-selective catalysis, host/guest chemistry, and low dielectric constant (low-κ) materials preparation, etc. The recent interest in organically functionalized mesoporous and microporous inorganic materials arises from the advantages that the disparate moieties bring to the system. Although the synthesis of organically functionalized periodic mesoporous organosilicas has been extensively reported, there has been limited success in the functionalization of microporous materials. Herein, we describe the preparation of phenyl-functionalized AlPO4-H1 (VPI-5). The functionalization of AlPO4-H1 with phenylphosphonic acid was investigated by solid state 13C and 31P NMR, BET, XRD, FTIR, EDX, and TGA.

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Template-free synthesis of AlPO4-H1, -H2, and -H3 by microwave heating

Cited by 18 publications

References 35 publications

Synthesis of Hydrated Aluminum Phosphate, AlPO₄·1.5H₂O (AlPO₄−H₃), by Controlled Reactive Crystallization in Sulfate Media

Synthesis of Hydrated Aluminum Phosphate, AlPO₄·1.5H₂O (AlPO₄−H₃), by Controlled Reactive Crystallization in Sulfate Media

Fabrication of bimodal (meso/macro) porous alumina materials using yeast cells as templates

Functionalization of Aluminophosphate AlPO₄-H1 (VPI-5) with Phenylphosphonic Acid

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Template-free synthesis of AlPO4-H1, -H2, and -H3 by microwave heating

Cited by 18 publications

References 35 publications

Synthesis of Hydrated Aluminum Phosphate, AlPO4·1.5H2O (AlPO4−H3), by Controlled Reactive Crystallization in Sulfate Media

Synthesis of Hydrated Aluminum Phosphate, AlPO4·1.5H2O (AlPO4−H3), by Controlled Reactive Crystallization in Sulfate Media

Fabrication of bimodal (meso/macro) porous alumina materials using yeast cells as templates

Functionalization of Aluminophosphate AlPO4-H1 (VPI-5) with Phenylphosphonic Acid

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Synthesis of Hydrated Aluminum Phosphate, AlPO₄·1.5H₂O (AlPO₄−H₃), by Controlled Reactive Crystallization in Sulfate Media

Synthesis of Hydrated Aluminum Phosphate, AlPO₄·1.5H₂O (AlPO₄−H₃), by Controlled Reactive Crystallization in Sulfate Media

Functionalization of Aluminophosphate AlPO₄-H1 (VPI-5) with Phenylphosphonic Acid