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

Abstract

The molecular structure of PS-b-PEO is quickly screened by spin-coating a precursor solution optimized for obtaining dried CeO2 powders, thereby successfully yielding highly porous CeO2 powders via temperature-controlled spray-drying.

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. 29,30,32–42 The thick frameworks are helpful for the successful crystallization of the metal oxide frameworks surrounding medium- and large-sized mesopores and/or macropores.…”

“…45–49 There are challenges in the synthesis of powders and films of Al 2 O 3 , TiO 2 and CeO 2 using PS- b -PEO. 36–40 Initially, the synthetic conditions to fabricate a large-sized mesoporous Al 2 O 3 film using a commercially available PS- b -PEO (18 000- b -7500 expressed with the molecular weight and pore size: 15–20 nm) were almost reproduced by spin-coating. 36 The original paper disclosed that the amount of solvent ( e.g.…”

“…51–54 As one of the most advantageous approaches, I have succeeded in synthesizing highly porous CeO 2 powders by spray-drying. 40 Referring to the synthetic conditions for the dried CeO 2 in the presence of a laboratory-made 17 000- b -5000 (fully crystallized: pore size: ∼14 nm; specific surface area: ∼110 m 2 g −1 ; and pore volume: ∼0.32 cm 3 g −1 after calcination at 350 °C), 54 the chemical composition of a precursor solution was fixed, but the molecular structure of PS- b -PEO was screened using a series of commercially available ones. The formation of highly porous CeO 2 films ( e.g.…”

“…, ∼20 nm for 16 000- b -7500 and ∼35 nm for 59 000- b -31 000 after calcination at 400 °C) was found by applying a rapid spin-coating of the precursor solution. 40 The successful precursor solutions were then spray-dried for the recovery of porous CeO 2 powders after checking the amount of PS- b -PEO (fully crystallized; specific surface area: ∼200 m 2 g −1 ; and pore volume: 0.46 cm 3 g −1 after calcination at 400 °C).…”

“…According to this approach, highly porous CeO 2 powders can be synthesized very smoothly by spray-drying combined with the spin-coating process for finding useful PS- b -PEO. 40 In addition, the recent success in synthesizing CeO 2 -doped TiO 2 powders with the formation of an ordered mesoporous structure using laboratory-made PS- b -PEO gives us a similar opportunity to ensure the chemical composition of a precursor solution for obtaining porous TiO 2 powders as the next approach (described below) starting from the synthetic conditions for obtaining PS- b -PEO templated dried powders and/or film-like bulks. 55,56…”