Formation of mesoporous, zirconium(IV) oxides of controlled surface areas

Trens, Philippe; Hudson, Michael J.; Denoyel, Renaud

doi:10.1039/a805193c

Cited by 42 publications

(24 citation statements)

References 15 publications

(3 reference statements)

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“…As for the pore size, the introductions of the templating agents can significantly enlarge the pore sizes of the resulted materials. In contrast to the other works, especially the work of Trens et al (1998), the zirconia obtained in the present work possessed a larger pore size, and at the same time, large surface area and high pore volume. The resulting larger pore size was contributed by the templating agent DTAB and the hydrothermal treatment.…”

Section: Effects Of Calcinations On the Microstructural Characteristicontrasting

confidence: 51%

“…12l, additional vague diffraction rings can be observed, indicating the existence of mixed tetragonal/monoclinic phases. The as-synthesized sample had great thermal stability because of the existence of tetragonal nanocrystallites, which are more stable than the bulk amorphous ones (Trens et al 1998 ). However, because of the absence of stabilizers, the crystallites of the samples grow gradually as the calcination temperature increases, until the well-organized mesostructure finally collapses.…”

Section: Effects Of Calcinations On the Microstructural Characteristimentioning

confidence: 99%

“…The resulting larger pore size was contributed by the templating agent DTAB and the hydrothermal treatment. Trens et al (1998) found that longer times of refluxing in high concentration basic environment could improve the thermal stability of the materials, because the nanosized semicrystalline zirconias were formed. Deshmane et al 2013) obtained similar conclusions.…”

Section: Effects Of Calcinations On the Microstructural Characteristimentioning

confidence: 99%

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Hydrothermal Synthesis of Mesoporous Nanocrystalline Tetragonal ZrO2 Using Dehydroabietyltrimethyl Ammonium Bromine

Wang¹,

Zhao²,

Wang³

et al. 2015

BioResources

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aMesoporous nanocrystalline tetragonal zirconias were successfully synthesized through a hydrothermal method using a novel bioresourcederived quaternary ammonium salt, dehydroabietyltrimethyl ammonium bromine (DTAB), as a templating agent. The templating agent provides a surface area (242.02 m 2 /g), high pore volume (0.53 cm 3 /g), and large average pore diameter (7.65 nm), which suggests that DTAB is a good candidate for mesostructure synthesis. The hydrothermal treatments give the materials improved thermal stabilities because of the generation of tetragonal nanocrystallites that are more stable than the bulk amorphous ones in the hydrothermal process. However, because of the absence of stabilizers, the sizes of the crystallites of the as-synthesized sample increase gradually with increasing calcination temperature. As the crystalline size of the sample rises to 25 nm, the nanocrystallites become too large to integrate well together, causing the well-organized mesostructure to collapse.

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Section: Effects Of Calcinations On the Microstructural Characteristicontrasting

confidence: 51%

Section: Effects Of Calcinations On the Microstructural Characteristimentioning

confidence: 99%

Section: Effects Of Calcinations On the Microstructural Characteristimentioning

confidence: 99%

See 1 more Smart Citation

Hydrothermal Synthesis of Mesoporous Nanocrystalline Tetragonal ZrO2 Using Dehydroabietyltrimethyl Ammonium Bromine

Wang¹,

Zhao²,

Wang³

et al. 2015

BioResources

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show abstract

“…4 and 5. As is obvious, the plots show a sharp and steeply inclined hysteresis loop which suggests the presence of a wide range of pores [25]. The pore size distributions were calculated from the desorption branch by the Barret-Joyner-Halenda (BJH) Method [26].…”

Section: Resultsmentioning

confidence: 99%

Development of new sorbents: I. Ordered porous phase of titanium phosphate

Hudson

Husain

Anbia

2005

JICS

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A new phase of titanium phosphate with a highly organized porous framework has been synthesized by a non-thermal digestion method. FTIR, TGA-DTA, XRD and SEM have been employed to study the primary product, calcined and digested materials. Pore diameters in the range of 22-90 Å have been obtained for the digested material as determined by nitrogen absorption measurements. Quantitative removal of copper(II) phthalocyanine and its derivative from aqueous medium have been achieved.

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“…Trens et al extended the work to very high surfactant:Zr of 10:1 [111]. They used CTMA-Br as micelle former and the synthesis was done at a pH of 11.6 (adjusted with NaOH).…”

Section: Mesoporous Zirconiamentioning

confidence: 99%

Structural and Morphological Control in the Preparation of High Surface Area Zirconia

et al. 2008

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The methods for the formation of zirconia including precipitation from aqueous salts, sol-gel synthesis from zirconium alkoxides, and the templated synthesis using surfactants are described in this review. The surface areas obtained vary widely but invariably decrease upon prolonged calcination. Digestion of hydrous zirconia and incorporation of dopants such as lanthanum, yttrium, or sulfate ions can increase the surface area and thermal stability. However, these methods also affect the crystal phase of zirconia. The transformation from the metastable tetragonal to the monoclinic phase occurs during the cooling phase of calcination. Mechanisms for the stabilization of the tetragonal phase are discussed. Zirconia with well-ordered mesopores or in the form of hollow spheres can be prepared but lack thermal stability, unless doped with phosphates, silicates or sulfates.

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Formation of mesoporous, zirconium(IV) oxides of controlled surface areas

Cited by 42 publications

References 15 publications

Hydrothermal Synthesis of Mesoporous Nanocrystalline Tetragonal ZrO2 Using Dehydroabietyltrimethyl Ammonium Bromine

Hydrothermal Synthesis of Mesoporous Nanocrystalline Tetragonal ZrO2 Using Dehydroabietyltrimethyl Ammonium Bromine

Development of new sorbents: I. Ordered porous phase of titanium phosphate

Structural and Morphological Control in the Preparation of High Surface Area Zirconia

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