Aerosol-assisted synthesis of titania-based spherical and fibrous materials with a rational design of mesopores using PS-b-PEO

Abstract

Surfactant-assisted synthesis is promising for the tailor-made design of highly porous metal oxide based nanomaterials. The comprehensive design of morphology, porous structure and crystallinity has been demanded for extending potential...

Low-temperature synthesis of NH3via an alternate gas-switching NOx storage-reduction process using a BaO/Pt@mTiO2 nanocomposite catalyst

“…The mesoporous structure of the catalyst would benet the enhancement of the catalytic performance due to its high surface area, large pore volume and tunable pore size related to the diffusivity as well as mass transport properties. [31][32][33][34] The spray-drying process is capable of designing the morphology of resultant materials (typically spherical), 9,[35][36][37][38][39][40][41][42][43] which is sometimes helpful for improving the catalytic performance. 44,45 The BaO/Pt@mTiO 2 type catalyst was characterized and utilized for investigating the catalytic performance during the gas-switching NO x storage reduction (NSR) process that involves sequential reactions, such as the oxidation of NO, the storage of NO 2 and the reduction of solidstate NO 3 − species for the synthesis of NH 3 .…”

Efficient optimization of the synthetic conditions for aerosol-assisted high-quality mesoporous CeO2 powders

“…2) as indicated by the presence of large-sized mesopores. 16,25–27 The BET surface area and the total pore volume were 160 m 2 g −1 and 0.35 cm 3 g −1 , respectively. 31 These extremely large values come from the presence of intercrystalline spaces of the resultant fine nanoparticles of CeO 2 in addition to the surfaces of the PS- b -PEO-templated mesopores.…”

“…In this study, the high-molecular-weight PSb-PEO type amphiphilic organic compounds were asymmetric and thus useful for obtaining large-sized mesoporous CeO 2 , as in the case of other metal oxides. 18,23,[25][26][27][28]…”

“…The morphology seemed different from that observed for mesoporous metal oxide particles, which were typically aggregated as spherical ones, prepared by an aerosol-assisted synthesis using amphiphilic organic molecules. [14][15][16]27 This was likely be due to the strongly ethanolic synthesis without water showing a high surface tension. The TEM images revealed that the PS-b-PEOtemplated mesopores were surrounded by ne CeO 2 nanoparticles (around 3 nm) (see (a) and (b) in Fig.…”

Smart synthesis of highly porous metal oxide powders with the self-assembly of amphiphilic organic compounds

“…28,31 Small-sized mesoporous structures have hardly been found among those prepared by applying the spray-drying EISA process. 29,30,[32][33][34][35][36][37][38][39][40][41][42] The thick frameworks are helpful for the successful crystallization of the metal oxide frameworks surrounding medium-and large-sized mesopores and/or macropores.…”