Synthesis of hexagonally packed porous titanium oxo-phosphate

Blanchard, Juliette; Schüth, Ferdi; Trens, Philippe; Hudson, Michael J.

doi:10.1016/s1387-1811(00)00192-x

Cited by 57 publications

(70 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The digestion method employed here can enhance the thermal stability of the mesostructures. 13 The phosphate groups act through the substitution of the thermally unstable nitrate groups and also through the bridging of uncondensed La-OH groups, resulting in stabilization of the inorganic part of the mesostructure. 13 The typical weight loss of the sample LP-1 (Figure 1) between 20 and 150 ˚C was assigned to the removal of water molecules.…”

Section: Resultsmentioning

confidence: 99%

“…13 The phosphate groups act through the substitution of the thermally unstable nitrate groups and also through the bridging of uncondensed La-OH groups, resulting in stabilization of the inorganic part of the mesostructure. 13 The typical weight loss of the sample LP-1 (Figure 1) between 20 and 150 ˚C was assigned to the removal of water molecules. The weight loss between 150 and 800 ℃ might correspond to the removal of all CTAB groups, probably resulting in the formation of lanthanum oxophosphate.…”

Section: Resultsmentioning

confidence: 99%

“…The surface area of the material calcined at 550 ℃ is about 10 times lower than the one reported for mesoporous silicon oxide materials. 13 Powder XRD patterns of the digested product lanthanum phosphate LP-1 and calcined lanthanum phosphate LP-2, with the high-2θ region are presented in Figures 4 and 5. The patterns of the LP-1 and LP-2 mesostructures are characteristic of lamellar phase with spacing d of 2.1 and 0.5 nm, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…9 However, the potential diversity of chemical, electrical and optical properties that can be envisaged makes transition metal-based ordered mesoporous materials extremely attractive. 10,11 Therefore, transition metal-based materials have been synthesized based on titanium, [12][13][14][15] zirconium [16][17][18] or tantalum, 19 and most of them are either hexagonally ordered or rather disordered. Recently, the synthesis and use of mesoporous silica in removal of few heavy metal ions from aqueous media have been reported, [20][21][22] and the development of new sorbents would be valuable.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Synthesis of Mesoporous Lanthanum Phosphate and Its Use as a Novel Sorbent

Anbia

Rofouei

Husain³

2006

Chin. J. Chem.

View full text Add to dashboard Cite

Mesoporous lanthanum phosphate was synthesized by supramolecular self-assembly of cetyltrimethylammonium bromide and lanthanum nitrate following digestion in phosphoric acid. TGA-DTA, XRD and SEM were employed to study the uncalcined and calcined materials. Sorption behavior of Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Ba(II), Hg(II) and Pb(II) cations was studied on such materials in water, 3 mol•L -1 ammonia, 0.01 mol•L -1 potassium ferrocyanide and 0.01 mol•L -1 potassium ferricyanide solutions.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of Mesoporous Lanthanum Phosphate and Its Use as a Novel Sorbent

Anbia

Rofouei

Husain³

2006

Chin. J. Chem.

View full text Add to dashboard Cite

show abstract

“…The observed d (100) values of calcined W-ZSs in Figure 3, 2.9 nm, were slightly different from those determined by the XRD measurement (2.97 nm, Table 1). This discrepancy could result from the shrinking of pores due to the irradiation of the TEM electron beam, [20,25,26] which is often observed, as described in the Supporting Information (Table S1). The correlation of the pore formation with the pH sol(e) is discussed here.…”

Section: Preparation Of Porous W-zs Samples Through Calcinationmentioning

confidence: 99%

Preparation of Porous ZrO₂‐Based Composite Oxides Containing W, Cr, Mo, or V Through a Wall Ion‐Exchange Method

et al. 2013

View full text Add to dashboard Cite

Keywords: Ion exchange / Composite oxides / Microporous materials / Zirconium / Tungsten MO x -ZrO 2 (M = W, Cr, Mo, or V) composite oxides with high surface areas and hexagonal pore structures were prepared through a wall ion-exchange (WIE)-calcination method. A composite (ZS) of Zr(SO 4 ) 2 ·4H 2 O and cetyltrimethylammonium bromide with ordered hexagonal structure was cast into solutions of M oxyanions. The efficiency of the WIE treatment was first studied on the solutions of tungsten oxyanion in detail. The surface areas of tungsten-oxyanion-introduced ZSs (W-ZSs) after calcination at 673 K in air for 2 h were 3-248 m 2 g -1 depending on the pH values of the exchange solutions. The treatments at pH = 5.6-10.1 resulted in the formation of porous materials with surface areas of 38-248 m 2 g -1 IntroductionZirconium oxide [1,2] and its composite oxides [3][4][5] have been employed as catalysts and supports because of their redox, acid/base, and thermal stabilities. For example, WO x -ZrO 2 and MoO x -ZrO 2 are typical solid acid catalysts with activity in the isomerization of n-alkanes, [3] alkylation of phenols, [4] and esterification.[5] The preparation of ZrO 2 -based oxides with high surface areas has thus been widely studied. Porous ZrO 2 , [6][7][8] Zr-Cr oxide (374 m 2 g -1 ), [9] ZrO 2 -MoO 3 (275 m 2 g -1 ), [10] ZrO 2 -WO 3 (228 m 2 g -1 ), [10] ZrO 2 -WO 3 (305 m 2 g -1 ), [11] VO x -ZrO 2 (340 m 2 g -1 ), [12] and MnO 2 -ZrO 2 (256 m 2 g -1 ) [13] have been reported. However, their preparation methods were specialized for the respective materials, and no versatile method has been suggested. Therefore, ZrO 2 -based oxides of 100 m 2 g -1 or lower have been used repeatedly as catalysts by others. [14][15][16] The present group has reported the wall ion-exchange (WIE) method [17][18][19][20] as a novel preparation method of hexagonally mesostructured materials, some of which gave porous oxides with hexagonal arrays of micropores and high surface areas after calcination.[ 4970and pore sizes of approximately 1.2 nm, whereas treatments at pH = 2.5-4.8 gave surface areas of 3-18 m 2 g -1 . The predominant oxyanion in the former region was a monomeric ion, WO 4 2-. The WIE-calcination method was thus applied to the preparation of Cr-, Mo-, or V-containing ZrO 2 composite oxides in which the respective monomeric oxyanions were employed as the exchange ions by adjusting the pH values of the solutions. The surface areas of calcined Cr-, Mo-, and V-ZS were 348, 251, and 229 m 2 g -1 , respectively, and pore sizes were 1.00-1.12 nm. The WIE-calcination method was proved to be a general method for the preparation of porous ZrO 2 -based oxides.(CTAB), [21] abbreviated as ZS in this study, is a starting material of the WIE treatment, and has the composition Zr(HSO 4 )(C 19 H 42 N) 0.61 (OH) 3.57 ·2H 2 O with ordered hexagonal arrays of surfactant micelles as shown in Figure 1. The hydrogen sulfate anions (HSO 4 -) in the ZS wall can be exchanged readily for oxyanions of phosphorus, [17,20] arsenic, [18] and seleniu...

show abstract

Hexagonal and Cubic Thermally Stable Mesoporous Tin(IV) Phosphates with Acidic and Catalytic Properties

et al. 2002

View full text Add to dashboard Cite

Since the initial work of Mobil researchers on the synthesis of mesoporous silica, [1] a lot of work has been devoted to extend the composition of mesoporous materials to metal oxides other than silica for applications in acid, redox catalysis, or photocatalytic processes. [2±4] Polyhedron 1998, 17, 845 ± 850; b) V. L. Pecoraro, G. B. Wong, T. A. Kent, K. N. Raymond, J. Am. Chem. Soc. 1983, 105, 4617 ± 4623. [16] X-ray crystal data for 1: C 36 H 63 CrN 6 , M r 589.85, triclinic, P1 ≈ , a 9.9754(17), b 12.707(2), c 16.687(3) ä, a 77.228(3), b 75.734 (3), g 70.655(4)8, V 1911.5(6) ä 3 , Z 2, 1 calcd 1.025 g cm À3 , m 0.326 mm À1 , 8755 independent reflections harvested from 2450 frames of data collected at 20 s per frame and 0.28 between frames yielded 13 711 integrated intensities, R int 0.029. All data were included in the refinement. For I > 2s(I), R 1 0.0685 and wR 2 0.1856; including weak data R 1 0.1585 and wR 2 0.2141. Siemens/ Bruker P4-CCD, Mo Ka radiation (l 0.7107 ä), graphite monochromator, 2V max 56.58, T 295(2) K. Suitable crystals for single-crystal X-ray analysis were selected and mounted inside thin-walled capillaries in a dry box under nitrogen atmosphere. Data collection and integration used the Bruker SMART and SAINT software. Empirical absorption corrections were calculated using the program SA-DABS. [17] Solution and refinement used the programs SHELXS [17] and SHELXL-93. [17] All non-hydrogen atoms were described anisotropically. Hydrogen atoms were placed in calculated positions. The 3,5-di-tert-butylpyrazolato ligands typically show severe disorder in the tert-butyl groups, which results in modeling difficulties and high R values. However, other criteria of chemical and crystallographic reasonableness show these to be acceptable structural models. CCDC-175570 (1) and CCDC-175571 (2 ¥ (C 6 H 14 ) 0.5 ) contain the supplementary crystallographic data for this paper. These data can be obtained free of charge via www.ccdc.cam.ac.uk/conts/retrieving.html (or from the Cambridge Crystallographic Data Centre, 12, Union Road, ) are gratefully acknowledged for their collaboration in NMR and Mˆssbauer experiments.

show abstract

Synthesis of hexagonally packed porous titanium oxo-phosphate

Cited by 57 publications

References 19 publications

Synthesis of Mesoporous Lanthanum Phosphate and Its Use as a Novel Sorbent

Synthesis of Mesoporous Lanthanum Phosphate and Its Use as a Novel Sorbent

Preparation of Porous ZrO₂‐Based Composite Oxides Containing W, Cr, Mo, or V Through a Wall Ion‐Exchange Method

Hexagonal and Cubic Thermally Stable Mesoporous Tin(IV) Phosphates with Acidic and Catalytic Properties

Contact Info

Product

Resources

About

Synthesis of hexagonally packed porous titanium oxo-phosphate

Cited by 57 publications

References 19 publications

Synthesis of Mesoporous Lanthanum Phosphate and Its Use as a Novel Sorbent

Synthesis of Mesoporous Lanthanum Phosphate and Its Use as a Novel Sorbent

Preparation of Porous ZrO2‐Based Composite Oxides Containing W, Cr, Mo, or V Through a Wall Ion‐Exchange Method

Hexagonal and Cubic Thermally Stable Mesoporous Tin(IV) Phosphates with Acidic and Catalytic Properties

Contact Info

Product

Resources

About

Preparation of Porous ZrO₂‐Based Composite Oxides Containing W, Cr, Mo, or V Through a Wall Ion‐Exchange Method