Synthesis of a novel mesoporous silicon carbide with a thorn-ball-like shape

Zheng, Yong; Zheng, Ying; Lin, Liangxu; Ni, Jun; Wei, Kemei

doi:10.1016/j.scriptamat.2006.07.047

Cited by 16 publications

(7 citation statements)

References 23 publications

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“…This suggests that SiC-TEOS sample also presents some macroporous structure, for instance, interparticle or intrapaticle. 3,22,31 Meanwhile, the pore size distribution with a wide range of 10-60 nm confirms that some macroporous pores exist in the SiC-TEOS sample. In the case of the SiC-C x materials, the hysteresis loops are limited in the medium relative pressure range of 0.5-0.9, along with comparably narrow pore size distributions, indicating that the pores of SiC-C x materials present mesoporous structure exclusively.…”

Section: Physicochemical Properties Of Mesostructured Sic Materialsmentioning

confidence: 72%

“…So far, numerous technical methods including chemical vapor deposition (CVD), 19 direct carbonization of Si metals, 20 pyrolysis of organic or polymeric precursors, 21 and carbothermal reduction of a silica matrix 9 in the presence of an inert atmosphere have been developed to prepare porous SiC for various applications. Among the preparation methods, the carbothermal reduction of SiO 2 using carbon has attracted enormous interest, 22,23 because the cost of the raw materials is relatively low, they allow relatively low-temperature synthesis, the resulting materials are very pure, and they can retain the structure and morphology of the starting carbonaceous materials very well. Nevertheless, either the specific surface area (r150 m 2 g À1 ) or the porosity prepared by the above-mentioned methods is not satisfactory.…”

Section: Introductionmentioning

confidence: 99%

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A hybrid sol–gel synthesis of mesostructured SiC with tunable porosity and its application as a support for propane oxidative dehydrogenation

Liu

Xue

et al. 2011

Phys. Chem. Chem. Phys.

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Porous silicon carbide (SiC) is of great potential as catalyst support in several industrially important reactions because of its unique thermophysical characteristics. Previously porous SiC was mostly obtained by a simple sol–gel or reactive replica technique which can only produce a material with low or medium surface area (< 50 m2 g(−1)). Here we report a new hybrid sol–gel approach to synthesize mesostructured SiC with high surface area (151–345 m2 g(−1)) and tunable porosity. The synthesis route involves a facile co-condensation of TEOS and alkyloxysilane with different alkyl-chain lengths followed by carbothermal reduction of the as-prepared alkyloxysilane precursors at 1350 °C. The resulting materials were investigated by X-ray diffraction, N2 adsorption-desorption, transmission electron microscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy. A mechanism for the tailored synthesis of mesostructured SiC was tentatively proposed. To demonstrate the catalytic application of these materials, vanadia were loaded on the mesostructured SiC supports, and their catalytic performance in oxidative dehydrogenation of propane was evaluated. Vanadia supported on the mesostructured silicon carbide exhibits higher selectivity to propylene than those on conventional supports such as Al2O3 and SiO2 at the same propane conversion levels, mainly owing to its outstanding thermal conductivity which makes contributions to dissipate the heat generated from reaction thus alleviating the hot spots effect and over-oxidation of propylene.

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Section: Physicochemical Properties Of Mesostructured Sic Materialsmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

A hybrid sol–gel synthesis of mesostructured SiC with tunable porosity and its application as a support for propane oxidative dehydrogenation

Liu

Xue

et al. 2011

Phys. Chem. Chem. Phys.

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“…The density of the products was relatively low, ranging from 1.38 to 1.86 g cm À 3 . Thorn-ball-like SiC structures from a carbonaceous silicon xerogel starting from TEOS and saccharose were prepared by Zheng et al [21] These β-SiC particles have sizes from 100 nm to 1000 nm and a surface area up to 141 m 2 g À 1 . Resorcinol-formaldehyde/silica composite aerogels were successfully converted to silicon carbide with average sizes of around 10 nm at reduced temperatures of ca.…”

Section: Introductionmentioning

confidence: 99%

“…The density of the products was relatively low, ranging from 1.38 to 1.86 g cm −3 . Thorn‐ball‐like SiC structures from a carbonaceous silicon xerogel starting from TEOS and saccharose were prepared by Zheng et al [21] . These β‐SiC particles have sizes from 100 nm to 1000 nm and a surface area up to 141 m 2 g −1 .…”

Section: Introductionmentioning

confidence: 99%

Carbothermal synthesis of micron‐sized, uniform, spherical silicon carbide (SiC) particles

Feller

Rosenfeldt

Retsch

2021

Zeitschrift anorg allge chemie

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Dedicated to Prof. Dr. Josef Breu on the occasion of his 60 th birthday.Silicon carbide (SiC) particles are exciting structures because of their hardness, chemical inertness, and dielectric properties. In particular, their absorption/emission properties in the midinfrared range render them suitable structures for ambient temperature thermal emitters. However, the synthesis of uniform, spherical structures is still challenging. Here, we present a robust synthesis procedure based on carbothermal reduction of silica precursor particles. With an isotropic shrinkage of ~30 %, the spherical particle shape and uniformity are retained. Furthermore, we outline the influence of the gas atmosphere during the carbothermal treatment and demonstrate the successful conversion to SiC by electron microscopy, X-ray diffraction, thermal and optical analysis.

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“…This interest has resulted in extensive research into controlling silica particle shape, and synthesizing nanorods and nanotubes using various type of templates such as polymer fibres [10], porous membranes [11] and nanotube templates [12]. While several studies have reported on various silicon carbide (SiC) morphologies such as spheres [13], 'thorn-ball' spheres [14] and powders [15], this is the first report ever on using carbothermal reduction of a sacrificial carbon nanotube template to generate SiC nanotubes with a controlled anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Templated, carbothermal reduction synthesis of mesoporous silicon carbide from carbon nanotube–mesoporous silica core–shell composite

2018

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Mesoporous materials are the subject of extensive interest due to their large surface area and multiscale structural order. These properties are especially relevant for applications such as catalyst supports in both chemical and electrochemical systems. The first part of this study details the synthesis of carbon nanotube-mesoporous silica core-shell composites starting with single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) through micellar selfassembly. The formation of such a composite structure was verified using scanning electron microscopy and further analysis was carried out through X-ray diffraction (XRD). The subsequent refinement of the diffraction pattern revealed the silica shell to be of the continuous cubic (Ia3d) MCM48 structure. The mesoporous silica-carbon nanotube core-shell composite was later subjected to high-temperature carbothermal reduction. Subsequent XRD analysis showed that the reduction product was mesoporous silicon carbide (SiC). Thus, this study details a novel synthesis method for mesoporous SiC, which is an attractive material for possible diverse applications such as catalyst supports, intercalation electrodes and other emerging high technology areas.

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Synthesis of a novel mesoporous silicon carbide with a thorn-ball-like shape

Cited by 16 publications

References 23 publications

A hybrid sol–gel synthesis of mesostructured SiC with tunable porosity and its application as a support for propane oxidative dehydrogenation

A hybrid sol–gel synthesis of mesostructured SiC with tunable porosity and its application as a support for propane oxidative dehydrogenation

Carbothermal synthesis of micron‐sized, uniform, spherical silicon carbide (SiC) particles

Templated, carbothermal reduction synthesis of mesoporous silicon carbide from carbon nanotube–mesoporous silica core–shell composite

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