Synthesis of Highly Ordered Ir-Containing Mesoporous Carbon Materials by Organic–Organic Self-Assembly

Abstract

By simply adjusting the molar ratio of resorcinol (R) to formaldehyde (F) and optimizing the aging time of the gel, highly ordered mesoporous carbons (OMCs) have been synthesized under strong acidic conditions through aqueous self-assembly of R/F with triblock copolymer F127, without addition of any promoters. It was found that both the excess amount of R (R/F g 1/2) and the long aging time (96 h) were favorable to the formation of the OMC. This facile route was further extended to the synthesis of highly ordered iridium-containing mesoporous carbons (Ir-OMC) by adding H 2 IrCl 6 to the reaction mixture. The resultant Ir-OMCs were characterized by nitrogen sorption, X-ray diffraction (XRD), and transmission electron microscopy (TEM). The results showed that iridium particles, with sizes of ∼2 nm, were highly dispersed in the carbon matrix, while the ordered mesostructure of carbons remained well. Comparing with the Ir/OMC sample prepared by postimpregnation, such one-pot synthesized Ir-OMC samples had smaller Ir particles sizes and therefore exhibited higher activities and stabilities toward the catalytic decomposition of N 2 H 4 .

Synthesis, characterization, and catalytic application of highly ordered mesoporous alumina-carbon nanocomposites

“…The same phenomenon has been observed in carbon-silica [13] and carbon-titanium oxide [18] nanocomposites. On the other hand, in the wide-angle region, one can only observe two broad peaks at 23.3° and 42.1° 2θ which are typical of amorphous carbon materials [28]. No reflections corresponding to crystalline alumina phases were observed, indicating that the alumina species in the nanocomposites are either amorphous or highly dispersed in the framework.…”

“…Moreover, the framework composition can be continuously tuned over a wide range, creating a spectrum of materials with the same mesostructure but very different framework compositions, just like zeolites. In particular, this multi-component co-assembly process has shown great success in the synthesis of carbon-based nanocomposites with ordered mesostructures [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. For example, Zhao et al synthesized carbon-SiO 2 nanocomposites with interpenetrating networks using an evaporation-induced triconstituent co-assembly of resol phenol-formaldehyde resin (PF resin) oligomer, prehydrolyzed tetraethyl orthosilicate (TEOS), and triblock copolymer Pluronic F127, followed by carbonization [13].…”

Highly Efficient Extraction of Serum Peptides by Ordered Mesoporous Carbon

“…[10] The TEM and nitrogen sorption measurements (see the Supporting Information, Figures S1 a and S1 b) show that it has a well-ordered hexagonal pore structure with a narrow pore-size distribution centered at 4.8 nm, and a specific surface area of about 639 m 2 g À1 . A pore size of 4.8 nm is an ideal cutoff size to exclude most highly abundant serum proteins (such as HSA; 67 kDa, 5 nm 7 nm 7 nm).…”

Selective Catalytic Reduction of NO over Cu-Mn/OMC Catalysts: Effect of Preparation Method

“…No obvious differences in structural properties were observed between Cu-Mn/OMC(I) and Cu-Mn/OMC(M); however, the catalyst prepared by self-assembly synthesis possessed relatively low specific surface area and pore volume. This may be attributed to the distribution of carbon matrix with the incorporation of metal precursors during the self-assembly process, which could have a more remarkable impact on the pore structure (Gao et al, 2008).…”