Direct synthesis of AlSBA mesoporous molecular sieves: characterization and catalytic activities

Yue, Yinghong; Gédéon, A.; Bonardet, J.L.; d'Espinose, Jean-Baptiste; Fraissard, J.; Melosh, Nick

doi:10.1039/a904467a

Cited by 272 publications

(207 citation statements)

References 11 publications

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“…Similar SBET and VP were obtained for both SBA-15 and Al-SBA-15 (Si/Al ¼ 10) materials, while dP for Al-SBA-15 (Si/Al ¼ 2) was higher than for SBA-15. These results are in agreement with those obtained by Yue et al [25]. However, the SBET and VP decreased by about 33% and 40%, respectively, in the sample with higher Al content (Al-SBA-15 (Si/Al ¼ 2)) relative to the corresponding Al-free sample (Table 1).…”

Section: Textural Propertiessupporting

confidence: 92%

Synthesis of tungsten carbide on Al-SBA-15 mesoporous materials by carburization

Álvarez

Chimentão

Tichit

et al. 2016

Microporous and Mesoporous Materials

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a b s t r a c t Aluminum was incorporated into SBA-15 supports at molar ratios Si/Al ¼ 10 and 2 by the pH-adjusting method. The calcined mesoporous Al-SBA-15 supports, as well as the Al-free SBA-15 support, were impregnated with ammonium paratungstate ((NH4)10[H2W12O42]4H2O) aqueous solution. Tungsten carbide (W2C) was synthesized by temperature programmed carburization (TPC) from the WO3 supported on Al-SBA-15 and SBA-15 in a flow of CH4/H2. These resultant materials were characterized by powder X-ray diffraction (XRD), N2 adsorption/desorption, 27 Al NMR and Raman spectroscopies, and transmission electron microscopies (TEM and HRTEM). W2C species were obtained after the carburization process in all the materials. The mesoporous structure of the SBA-15 supports was preserved at all synthesis steps. XRD and TEM analyses revealed that the introduction of aluminum species into the SBA-15 greatly enhanced the dispersion of WO3 and W2C phases during the calcination and carburization steps, respectively. In situ XRD measured during the carburization in a synchrotron facility provided further details of the reduction of tungsten trioxide species as a function of temperature. The presence of aluminum in the SBA-15 notably affected the distribution and the reduction temperature of the tungsten oxide species.

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Section: Textural Propertiessupporting

confidence: 92%

Synthesis of tungsten carbide on Al-SBA-15 mesoporous materials by carburization

Álvarez

Chimentão

Tichit

et al. 2016

Microporous and Mesoporous Materials

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“…Under strong acidic conditions, the metal ions will exist in the cationic form other than their corresponding oxo species [10] and therefore cannot enter the framework of SBA-15. Notably, many efforts have been devoted to the incorporation of Al, Ti and V into SBA-15 [11][12][13][14][15][16][17], including the two-steps pH adjusting methods [14,15], the hydrolysis-controlled methods [15,16], and microwave-hydrothermal procedures [17]. However, the incorporation of Fe into the framework of SBA-15 by simple direct hydrothermal methods prepared in acidic media has rarely been reported [18], although Fe-zeolites and Fe-MCM-41 prepared in basic media have been widely investigated [6,[19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Direct synthesis of highly ordered Fe-SBA-15 mesoporous materials under weak acidic conditions

Feng

Lian

et al. 2005

Microporous and Mesoporous Materials

192

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“…These methods could be tailored to the development of aluminosilicate mesostructured solids with the addition of an aluminum precursor in the initial solution [6]. The resulting solids develop textural and structural properties very similar to those of the equivalent silicas and moreover present acidic properties due to the aluminum incorporation into the silica matrix.…”

Section: Mesostructured Aluminosilicate Materialsmentioning

confidence: 99%

New Aluminosilicate Materials with Hierarchical Porosity Generated by Aerosol Process

Chaumonnot

Tihay

Coupé

et al. 2009

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Matériaux aluminosilicates innovants à porosité hiérarchisée obtenus par voie aérosol -Cet article met en évidence le fort potentiel d'un procédé d'atomisation (ou procédé aérosol) pour obtenir de nouvelles familles de solides aluminosilicates présentant une porosité hiérarchisée dans la gamme de la micro à la macroporosité. Il est ainsi possible d'obtenir, en une seule étape de synthèse, et grâce à un procédé fonctionnant en continu, des aluminosilicates mésostructurés à forte teneur en aluminium, des solides composites constitués de nanocristaux de zéolithe piégés dans une matrice mésostructurée et des aluminosilicates micro, méso et macroporeux présentant des propriétés catalytiques en craquage du cumène inédites. Ces résultats prometteurs ouvrent des perspectives intéressantes pour le développement de nouveaux supports acides pour des catalyseurs d'hydrocraquage. Abstract -New Aluminosilicate Materials with Hierarchical Porosity Generated by Aerosol Process

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Direct synthesis of AlSBA mesoporous molecular sieves: characterization and catalytic activities

Cited by 272 publications

References 11 publications

Synthesis of tungsten carbide on Al-SBA-15 mesoporous materials by carburization

Synthesis of tungsten carbide on Al-SBA-15 mesoporous materials by carburization

Direct synthesis of highly ordered Fe-SBA-15 mesoporous materials under weak acidic conditions

New Aluminosilicate Materials with Hierarchical Porosity Generated by Aerosol Process

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