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Enhancement in thermal and hydrothermal stabilities of novel mesoporous MCM-41

Jomekian, A ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1007/s10934-011-9556-8
  3. Publisher: 2012
  4. Abstract:
  5. A novel mesoporous MCM-41 with remarkable wide channel diameters and thick walls was synthesized. The procedure involved the acid-catalyzed hydrolysis of tetraetheylorthosilicate (TEOS) in a water/ethanol/isopropoanol solvent mixture while employing 1-hexadecylamine as a templating agent and mesitylene as an auxiliary agent. After removal of the template by either extraction or calcination at 560 °C, the resulting mesoporous materials had surface areas of 1,289 and 1,210 m2/g.The channel diameterswere found to be 46.8-51.2 Å ,while thewall thicknesses were 20.9-21.1 Å. X-ray powder diffraction proved that the synthesized mesoporous structure belongs to MCM-41 family. Notably, they displayed higher thermal and hydrothermal stabilities, and have higher surface areas than conventionally prepared MCM-41 silica. The thickest channel walls (21.1 Å ) can withstand calcination to nearly 850 °C with minimal structural damage. The calcined sample was more resistant to hydrothermal treatment in boiling water than was the solvent extracted product but both materials showed minimal change after 35 h of hydrothermal treatment
  6. Keywords:
  7. Thermal and hydrothermal stabilities ; X-ray diffraction ; Acid-catalyzed hydrolysis ; Auxiliary agents ; Boiling water ; Channel diameters ; Channel wall ; Hydrothermal treatments ; MCM-41 ; MCM-41 silica ; Mesoporous MCM-41 ; Mesoporous structures ; Solvent mixtures ; Structural damages ; Surface area ; Templating agents ; Thermal and hydrothermal stability ; Thick-wall ; Calcination ; Hydrolysis ; Silica ; Water treatment ; X ray diffraction ; X ray powder diffraction ; Mesoporous materials
  8. Source: Journal of Porous Materials ; Volume 19, Issue 6 , 2012 , Pages 979-988 ; 13802224 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs10934-011-9556-8