Characterization of mesoporous carbons synthesized with SBA-16 silica template

Abstract

The structure of ordered mesoporous carbons (OMC) synthesized with sucrose, furfuryl alcohol or acenaphthene using the SBA-16 mesoporous silica template with cubic Im3 ¯m structure has been investigated with X-ray powder diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and N 2 adsorption. This work shows that, in contrast to carbons prepared from sucrose by using SBA-15 silica as template, the impregnation of SBA-16 with sucrose failed to produce OMC with cubic Im3 ¯m structure. However, when furfuryl alcohol and acenaphthene were used as carbon precursors, the cubic Im3 ¯m structure was retained in the products. Thus, the latter carbon precursors were more suitable than sucrose for the formation of rigidly interconnected carbon bridges through narrow apertures of the cage-like siliceous SBA-16 mesostructure. In particular, the use of furfuryl alcohol as carbon precursor allowed us to control the degree of mesopore filling in SBA-16 and consequently, to synthesize hollow or fully filled cage-like silica-carbon mesostructures as was done in the case of channel-like SBA-15. In the case of acenaphthene only fully filled mesostructures were formed but with a much higher degree of graphitization. In the present work, we took advantage of the recent developments in the synthesis of SBA-16 with tailored diameter and entrance size of mesopores and made a step forward in the fabrication of OMC by using cage-like mesoporous silicas with narrow interconnections as templates.{ Electronic supplementary information (ESI) available: Fig. 1S, 4S, and 5S showing N 2 adsorption-desorption isotherms for the SBA-16/ carbon composites, the recovered SBA-16 samples obtained from the composites, and the carbon samples, respectively; Fig. 2S and 3S showing XRD patterns for the C FA1 -t carbons and the recovered SBA-16 samples obtained from the composites. See

Facile preparation of 3D ordered mesoporous CuOx–CeO2 with notably enhanced efficiency for the low temperature oxidation of heteroatom-containing volatile organic compounds

“…Both the calcined and FMA treated samples have one intense diffraction peak at around 0.8u, alongside two other weak peaks between 1.1-2.0u, which can be assigned to the (110), (200) and (211) reflections of the cubic Im3m mesostructure. 38 The htpCC10 and htpCC20 oxide catalysts possess (110) and (200) reflections between 0.7-1.1u, which indicate that the uniform pore structure of FMA-SBA-16 is well retained. Furthermore, the diffraction peaks appear to become weaker or even disappear with increasing Cu content, which indicates that the ordered mesoporous structure decreases to some extent.…”

“…Ryoo et al 38 proposed that the obtained SBA-16 possessed the largest possible pore diameter and pore window size as well as the highest possibility of forming an ordered structure when a mixture of P123 (EO 20 PO 70 EO 20 ) and F127 (EO 106 PO 70 EO 106 ) with an EO/PO ratio of 16/7 was adopted. Therefore, in the present work, SBA-16 was prepared under acidic conditions using two poly(alkylene oxide)-type triblock copolymers, Pluronic 123 and F127, as structure-directing agents and tetraethyl orthosilicate (TEOS) as a silica source.…”

“…have uniform mesocavities, high surface areas, and large pore volumes, which makes them the perfect candidates to serve as ''hard templates''. 35,37,38 Among these, SBA-16 has three-dimensional (3D) channels and a cubic Im3m (bodycentered cubic arrangement of cages with 8 apertures to the nearest neighbors) structure, which could be more favorable for mass and thermal transfer than a unidirectional pore system. 39 In order to introduce the maximum quantity of metal precursors, as many silanol groups as possible must be retained during the preparation of the silica template.…”

Comparison of ordered mesoporous materials sorption properties towards amino acids

“…The synthesis was carried out according to the procedure proposed by Kim et al (Kim et al 2005a). The portions of 0.58 g of Pluronic P123 (BASF) and 2.9 g of Pluronic F127 (Aldrich) were dissolved in 160 ml of distilled water and 10 ml of hydrochloric acid (Chempur, 37 %) at 35°C.…”

Synthesis of Ordered Mesoporous Manganese Oxides by Double Replication for Use as an Electrode Material

“…Silica and carbon templates were synthesized using modified literature procedures. [8][9][10] The following wet impregnation procedure was used for synthesis of mesoporous Mn 2 O 3 , unless otherwise noted: A 1.0 g sample of CMK-3 or C-SBA-16 was dispersed in 2.0 mL of a tetrahydrofuran (THF) solution…”