Synthesis and characterization of SBA-3, SBA-15, and SBA-1 nanostructured catalytic materials

Anunziata, Oscar A.; Beltramone, Andrea R.; Martínez, María Laura; Belon, Lizandra López

doi:10.1016/j.jcis.2007.06.033

Cited by 79 publications

(38 citation statements)

References 39 publications

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“…cylinders constituted by particles with a wheat grain shape (as commonly observed in pure SBA-15 materials), was conserved after functionalization [Figures 2(b) and (c)]. This result is consistent with those obtained in similar studies (Anunziata et al 2007;Sujandi et al 2008) and indicates that there were no morphological differences between the obtained silicas.…”

Section: Resultssupporting

confidence: 90%

Preparation and Characterization of Textural and Energetic Parameters of Common and Functionalized SBA-15 Mesoporous Silicas

Vargas

Legnoverde

Giraldo

et al. 2010

Adsorption Science & Technology

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A set of SBA-15 ordered mesoporous silicas presenting different surface acidities was obtained by organo-functionalization. Amino and sulphonic groups were attached onto the silica surface in order to determine the influence of organo-functionalization with acidic and basic moieties on the adsorption properties of silica. Cephalexin, an antibiotic molecule characterized by its zwitterionic nature, was selected as the adsorbate. The obtained matrices were characterized by scanning electron microscopy, energy dispersive X-ray analysis and nitrogen adsorption isotherms at 77 K. Enthalpies of immersion into water, benzene and cephalexin solutions were measured by immersion calorimetry, and the cephalexin adsorption capacities of the different matrices were also determined. The structure of SBA-15 was conserved in the functionalized samples despite a noticeable reduction in the BET surface area, pore volume and pore size. It was found that the inclusion of amino groups promoted interaction between the adsorbent and adsorbate, thereby favouring the retention of cephalexin.

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Section: Resultssupporting

confidence: 90%

Preparation and Characterization of Textural and Energetic Parameters of Common and Functionalized SBA-15 Mesoporous Silicas

Vargas

Legnoverde

Giraldo

et al. 2010

Adsorption Science & Technology

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“…Silica is divided into four categories by their diameters, namely microporous silica, mesoporous silica, macroporous silica and megaporous silica [16]. Mesoporous silica has a uniform diameter in the range of 2-50 nm.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Cobalt Dispersion on Co/SBA-15 and Co/SBA-16 Catalysts by Ultrasound and Vacuum Treatments during Post-Impregnation Step

Kruatim¹,

Jantasee²,

Jongsomjit³

2017

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Abstract. The Co/SBA-15 and the Co/SBA-16 catalysts having 20 wt% of cobalt were prepared by the conventional impregnation method. Then, the post-impregnation treatments including vacuum and ultrasound treatments were applied. The synthesized catalysts were characterized by means of N2 physisorption, small angle X-ray diffraction (SAXRD), wide angle X-ray diffraction (XRD), scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM/EDX), transmission electron microscopy (TEM), and temperature-programmed reduction (TPR). The results show that the synthesized SBA-15 had hexagonal structure and the synthesized SBA-16 had the cubic structure. The vacuum and the ultrasound treatments after incipient wetness impregnation can apparently enhance the dispersion of cobalt on the SBA-15 catalysts due to the decrease of the metal crystallite size. However, only the vacuum treatment was suitable for the Co/SBA-16. After reduction, no cobalt-silicate compound was detected based on XRD measurement. Both postimpregnation treatments can also decrease the metal-support interaction resulting in increased activity for CO2 hydrogenation under methanation.

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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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Synthesis and characterization of SBA-3, SBA-15, and SBA-1 nanostructured catalytic materials

Cited by 79 publications

References 39 publications

Preparation and Characterization of Textural and Energetic Parameters of Common and Functionalized SBA-15 Mesoporous Silicas

Preparation and Characterization of Textural and Energetic Parameters of Common and Functionalized SBA-15 Mesoporous Silicas

Improvement of Cobalt Dispersion on Co/SBA-15 and Co/SBA-16 Catalysts by Ultrasound and Vacuum Treatments during Post-Impregnation Step

Polymerization of Aniline in Different Sba-16 Silica Hosts

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