[해외논문]Soft-to-hard consecutive templating one-pot route from metal nitrate/phenol resin/surfactant to mesoporous metal oxides with enhanced thermal stability
Lee, Su-Kyung
(Department of Chemistry, Korea Advanced Institute for Science and Technology (KAIST))
,
Jo, Changbum
(Department of Chemistry and Chemical Engineering, Inha University)
,
Kim, Jaeheon
(Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS))
,
Ryoo, Ryong
(Department of Chemistry, Korea Advanced Institute for Science and Technology (KAIST))
Abstract Mesoporous materials with crystalline ZrO2, Y2O3, and CeO2 frameworks were one-pot synthesized from a clear solution of ethanol containing metal nitrates, organic surfactant (i.e., Pluronic® F-127), formaldehyde, and phloroglucinol. The solution was converted to a mesostructured nanoco...
Abstract Mesoporous materials with crystalline ZrO2, Y2O3, and CeO2 frameworks were one-pot synthesized from a clear solution of ethanol containing metal nitrates, organic surfactant (i.e., Pluronic® F-127), formaldehyde, and phloroglucinol. The solution was converted to a mesostructured nanocomposite of metal nitrate/phenol resin/surfactant via a solvent evaporation-induced self-assembly process. The obtained nanocomposite was calcined at 800 °C in a N2 atmosphere. X-ray powder diffraction and electron microscopic investigation revealed that the calcination caused amorphous-to-crystalline transformations in the metal oxide frameworks, while sintering to bulk metal oxides was prevented by the in-situ generated carbon component. Mesoporous metal oxides with a crystalline framework were obtained when the carbon skeleton was burnt off. The mesoporous metal oxides exhibited high BET surface areas, narrow pore-size distributions, and enhanced thermal stability. A practical benefit of the mesoporous metal oxides was demonstrated with Au/CeO2 exhibiting high catalytic activity in the water-gas-shift reaction. Highlights Synthesis for various mesoporous metal oxides using a soft-to-hard template. Commercial and inexpensive surfactant with phenol resin as an effective template. Pyrolysis step plays an important role in a soft-to-hard templating. The soft-to-hard templating gives thermally stable metal oxide frameworks. Graphical abstract [DISPLAY OMISSION]
Abstract Mesoporous materials with crystalline ZrO2, Y2O3, and CeO2 frameworks were one-pot synthesized from a clear solution of ethanol containing metal nitrates, organic surfactant (i.e., Pluronic® F-127), formaldehyde, and phloroglucinol. The solution was converted to a mesostructured nanocomposite of metal nitrate/phenol resin/surfactant via a solvent evaporation-induced self-assembly process. The obtained nanocomposite was calcined at 800 °C in a N2 atmosphere. X-ray powder diffraction and electron microscopic investigation revealed that the calcination caused amorphous-to-crystalline transformations in the metal oxide frameworks, while sintering to bulk metal oxides was prevented by the in-situ generated carbon component. Mesoporous metal oxides with a crystalline framework were obtained when the carbon skeleton was burnt off. The mesoporous metal oxides exhibited high BET surface areas, narrow pore-size distributions, and enhanced thermal stability. A practical benefit of the mesoporous metal oxides was demonstrated with Au/CeO2 exhibiting high catalytic activity in the water-gas-shift reaction. Highlights Synthesis for various mesoporous metal oxides using a soft-to-hard template. Commercial and inexpensive surfactant with phenol resin as an effective template. Pyrolysis step plays an important role in a soft-to-hard templating. The soft-to-hard templating gives thermally stable metal oxide frameworks. Graphical abstract [DISPLAY OMISSION]
※ AI-Helper는 부적절한 답변을 할 수 있습니다.