Characterization and acidic properties of Al-SBA-15 materials prepared by post-synthesis alumination of a low-cost ordered mesoporous silica

Gómez-Cazalilla, M.; Mérida‐Robles, J.; Gurbani, A.; Rodríguez‐Castellón, Enrique; Jiménez‐López, Antonio

doi:10.1016/j.jssc.2006.12.038

Cited by 135 publications

(75 citation statements)

References 50 publications

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“…The 27 Al NMR spectrum shows just a signal at 53 ppm typically assigned to tetrahedral aluminium atoms suggesting the formation of Bronsted groups, because of the formation of Al-O-Si bonds in the structure. [35][36][37] The presence of this aluminium confers more acidic properties to the S-Al material compared with the S and S-NaF materials. 38 The nitrogen adsorption-desorption isotherms and BJH distributions for hosts are shown on Figure 3.…”

Section: Resultsmentioning

confidence: 99%

Polymerization of Aniline in Different Sba-16 Silica Hosts

Giraldo¹,

Vélez²,

Mesa³

2016

Química Nova

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publicado na web em 06/06/2016Polyaniline-silica composites made with mesoporous silica have been reported to improve the mechanical properties of the free polymer. However, there are not many studies about the effect of the chemical and physical properties of the inorganic material used as hosts over the final properties of polyaniline and the composites. Here, polyaniline-silica composites, exhibiting electrical conductivity, were synthesized using different types of SBA-16 mesoporous silica as hosts. The effects of the characteristics of the hosts in the polymerization kinetic, molecular weight and electrical conductivity of the final polymer were studied. The composites showed higher electrical conductivity in comparison with polyaniline synthesized under similar conditions of this work but in the absence of silica. The use of silica allowed to obtain composites with defined morphology, which did not occur in the absence of these hosts. From the results of this work, it can be concluded that SBA-16 mesoporous silica hosts have a bifunctional role in the formation of polyaniline-silica composites: the hosts behaved like nucleation sites, which favors polymerization of high molecular weight polyaniline and they catalyzed the polymerization reaction, especially when aluminum is present in the structure of the host.

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Section: Resultsmentioning

confidence: 99%

Polymerization of Aniline in Different Sba-16 Silica Hosts

Giraldo¹,

Vélez²,

Mesa³

2016

Química Nova

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“…The supports employed were MCM-41 mesoporous silica ; that doped with zirconium (Zr-MCM) ; SBA-15 mesoporous silica (Gómez-Cazalilla et al, 2007); SBA doped with zirconium (Zr-SBA) and aluminium (Al-SBA) (Gómez-Cazalilla et al, 2007). Finally a commercial -Al2O3 was also employed as reference.…”

Section: Influence Of the Materials Supportmentioning

confidence: 99%

“…The use of SBA-15 as a support for hydrotreating catalysts has presented several advantages with regard to HMS and MCM-41 mesoporous solids, since SBA-15 material has thicker pore walls and better hydrothermal stability, which are very important properties in hydrotreating processes due to the severe reaction conditions employed (Vradman et al, 2003). Recently, Gómez Cazalilla et al (Gómez-Cazalilla et al, 2007) have proposed a cheap sol-gel synthesis route for SBA-15 and aluminium doped SBA-15, with sodium silicate as the silica source. The resulting materials have shown interesting properties as catalyst supports in hydrotretating reactions (Gómez-Cazallila et al, 2009a.…”

Section: Introductionmentioning

confidence: 99%

Transition Metal Sulfide Catalysts for Petroleum Upgrading – Hydrodesulfurization Reactions

Infantes‐Molina¹,

Romero-Pérez²,

Eliche-Quesada³

et al. 2012

Hydrogenation

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“…The synthesis of the SBA-15 support was carried out according to the route reported by Gómez-Cazalilla et al (2007). Thus, 25 g Pluronic were dissolved in 1 ᐉ of 0.4 M sulphuric acid solution and the resulting mixture maintained under gentle stirring at room temperature for 24 h. Then, 1 g sodium hydroxide was supplied for pH adjustment, followed by the dropwise addition of sodium silicate solution (66.4 mᐉ sodium silicate in 920 mᐉ distilled water) under mild stirring, which was continued for 5 d as the gel particles were formed.…”

Section: Synthesis Of Sba-15 and Post-synthesis Metal Impregnationmentioning

confidence: 99%

Synthesis and Characterization of Metal-Supported Mesoporous Silicas Applied to the Adsorption of Benzothiophene

Vilarrasa-García

Azevedo

Braos-Garcı́a

et al. 2011

Adsorption Science & Technology

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ABSTRACT:The present work reports adsorption/desorption studies of benzothiophene (BT) onto SBA-15 loaded with Fe, Pd and Cu employing in situ FT-IR spectroscopy and batch liquid-phase adsorption methods. The adsorbents were prepared by post-synthesis impregnation of metal salts onto pure siliceous SBA-15 by solid mixture and incipient wetness methods. The adsorbents were characterized by nitrogen adsorption isotherms, TEM, X-ray diffraction and X-ray photoelectron spectroscopy (XPS). The incorporated metals, in different oxidation states, were dispersed as nanoparticles on the mesoporous channels of SBA-15. The surface area decreased significantly for samples with incorporated metals, especially for those prepared by solid-mixture impregnation (Cu and Pd), although the hexagonal arrangement and the average pore size remained virtually unaltered. As revealed by batch adsorption isotherms, the incorporation of metals effectively increased the retention of the adsorbent towards the sulphur compound in the following order: Pd > Fe > Cu. DRIFT spectra (under in situ adsorption/desorption conditions) of the samples containing Fe and Pd showed that adsorption of BT onto the former is mainly reversible, whereas BT seems to be chemisorbed in the latter and did not desorb readily upon thermal treatment under He flow.

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Characterization and acidic properties of Al-SBA-15 materials prepared by post-synthesis alumination of a low-cost ordered mesoporous silica

Cited by 135 publications

References 50 publications

Polymerization of Aniline in Different Sba-16 Silica Hosts

Polymerization of Aniline in Different Sba-16 Silica Hosts

Transition Metal Sulfide Catalysts for Petroleum Upgrading – Hydrodesulfurization Reactions

Synthesis and Characterization of Metal-Supported Mesoporous Silicas Applied to the Adsorption of Benzothiophene

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