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

Li, Ying; Feng, Zhaochi; Lian, Yong; Sun, Kang; Zhang, Lei; Jia, Guifang; Yang, Qihua; Li, Can

doi:10.1016/j.micromeso.2005.05.021

Cited by 188 publications

(111 citation statements)

References 54 publications

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“…FeSBA-15 catalysts with a range of Fe loadings were synthesized by a direct synthesis method [25] using tetramethyl orthosilicate (TMOS) and iron nitrate (FeðNO 3 Þ 3 Á 9H 2 O) as silicon and iron precursors, respectively. The non-ionic triblock copolymer surfactant EO 20 PO 70 EO 20 (P123) was applied as the structuredirecting agent.…”

Section: Methodsmentioning

confidence: 99%

“…With increasing iron loading, strong bands at 367 and 530 nm are observed. Li et al [25] have systematically investigated the correlations between the absorption bands and the Fe loadings of FeSBA-15 materials prepared by a similar method. The single absorption band between 210 nm and 250 nm was attributed to isolated four-coordinated Fe 3þ ions.…”

Section: Characterizationmentioning

confidence: 99%

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Controlling Reaction Pathways for Alcohol Dehydration and Dehydrogenation over FeSBA-15 Catalysts

Guan

Santen

et al. 2007

Catal Lett

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The iron location in FeSBA-15 strongly influences the selectivity to dehydrogenation and dehydration in ethanol conversion. At low iron loading, Fe is present as isolated Fe 3þ species in the amorphous silica phase. At higher loading additional aggregated forms of iron oxide exist. Isolated Fe 3þ species in the silica matrix imply Brønsted acidity resulting in selective formation of ethylene, whereas FeO x clusters catalyze formation of ethylene and aldehyde.

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Section: Methodsmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

Controlling Reaction Pathways for Alcohol Dehydration and Dehydrogenation over FeSBA-15 Catalysts

Guan

Santen

et al. 2007

Catal Lett

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“…Figure 9 presents the Raman spectra for the P10-derived amorphous silica synthesized by heat treatment in air (route R2), and their assignments are listed in Table 2. The spectra for the 600˝C heat-treated sample exhibited broad bands related to the O-Si-O and Si-O-Si asymmetrical vibrations at 800 and 978 cm´1, respectively [43]. The weak broad bands above 1000 cm´1 were thought to be attributed to the SiO 4 asymmetrical vibration [44][45][46].…”

Section: N2 Adsorption/desorption Isotherm and Porosities Evaluated Fmentioning

confidence: 99%

“…On the other hand, the lower wavenumber bands below 700 cm −1 were attributed to the Si-O-Si symmetric vibrations originated from structural defects such as 3-, 4-and 6-membered Si-O-Si rings within the amorphous silica matrix [47][48][49]. Li et al [43] 1000-1200 (νas) -Asymmetric stretching SiO4 vibrations Apopei et al [44] Makreski et al [45] Ventura et al [46] 200 400 600 800 1000 1200…”

Section: N2 Adsorption/desorption Isotherm and Porosities Evaluated Fmentioning

confidence: 99%

Formation of Micro and Mesoporous Amorphous Silica-Based Materials from Single Source Precursors

et al. 2016

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Polysilazanes functionalized with alkoxy groups were designed and synthesized as single source precursors for fabrication of micro and mesoporous amorphous silica-based materials. The pyrolytic behaviors during the polymer to ceramic conversion were studied by the simultaneous thermogravimetry-mass spectrometry (TG-MS) analysis. The porosity of the resulting ceramics was characterized by the N 2 adsorption/desorption isotherm measurements. The Fourier transform infrared spectroscopy (FT-IR) and Raman spectroscopic analyses as well as elemental composition analysis were performed on the polymer-derived amorphous silica-based materials, and the role of the alkoxy group as a sacrificial template for the micro and mesopore formations was discussed from a viewpoint to establish novel micro and mesoporous structure controlling technologies through the polymer-derived ceramics (PDCs) route.

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“…It is well known that pure silica SBA-15 is inert in catalytic reactions due to the absence of heteroatom activity sites. Therefore, many scientists have attempted to incorporate various atoms, such as Ti, V, Al, Cr, Fe, into the framework or disperse them onto the surface of siliceous materials as metal or metal oxides, which can introduce catalytic sites into mesoporous materials [5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Direct synthesis of lanthanide-containing SBA-15 under weak acidic conditions and its catalytic study

Hao

et al. 2008

Microporous and Mesoporous Materials

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Lanthanide (Ln including La, Ce and Nd) containing SBA-15 molecular sieves with molar ratio Ln/Si = 0.01-0.2 were prepared via direct synthesis under weak acidic conditions (pH 1.5-3.0). Characterizations of these samples were done by powder X-ray diffraction, N 2 adsorption, inductively coupled plasma atomic emission spectrometry (ICP-AES), FT-IR spectroscopy, and diffuse reflectance ultraviolet spectroscopy. All the samples show a highly ordered two-dimensional hexagonal mesostructure. N 2 adsorption testifies that all the Ln-containing SBA-15 materials have the type IV isotherms with type H 1 hysteresis loop as well as high specific surface area (798-925 m 2 /g) and narrow pore size distribution. The diffuse reflectance UV-vis, ICP-AES, and the wide-angle XRD spectra show that most of the lanthanide ions are better dispersed in the calcined materials. The Ln-SBA-15 supported Pd catalysts show high catalytic activity in the oxidation of benzene. The results reveal that Ln-SBA-15 materials can be used as potential supports for the catalytic oxidation of VOCs.

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

Cited by 188 publications

References 54 publications

Controlling Reaction Pathways for Alcohol Dehydration and Dehydrogenation over FeSBA-15 Catalysts

Controlling Reaction Pathways for Alcohol Dehydration and Dehydrogenation over FeSBA-15 Catalysts

Formation of Micro and Mesoporous Amorphous Silica-Based Materials from Single Source Precursors

Direct synthesis of lanthanide-containing SBA-15 under weak acidic conditions and its catalytic study

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