Paper Title:
Hydrothermal Stability of Ordered Mesoporous Titanosilicate Materials Prepared at Room Temperature
  Abstract

A study of hydrothermal stability, performed in boiling water under static conditions, of MCM-41 materials containing different titanium content, prepared by direct synthesis at ambient temperature and pressure, using tetraethoxysilane, titanium ethoxide and octadecyltrimethyl- ammonium bromide is presented. The behaviour is compared with pure silica grades prepared by a similar procedure. The samples were characterised by X-ray diffraction, adsorption of nitrogen at 77K and diffuse reflectance UV–Vis spectroscopy. It was found that the stability improves as the amount of titanium increases and that Ti-MCM-41 samples prepared with Si/Ti≤50 are significantly stable. After 12h in boiling water the pore size uniformity was practically maintained and only a small decrease in pore volume (5-9%), total surface area (2-7%) and mesopore width (3%) and a slight increase in pore wall thickness (3-6%) occurred. In contrast, some degradation of the MCM-41 structure for the pure silica and the lower Ti content (Si/Ti=100) samples was observed with the effect being less pronounced for the latter. The higher hydrothermal stability of titanium substituted samples is probably correlated with a higher degree of polymerisation of the pore walls and with the presence of extra framework titanium.

  Info
Periodical
Edited by
Paulo Sérgio Duque de Brito and José Gañán Gómez
Pages
63-70
DOI
10.4028/www.scientific.net/AMR.107.63
Citation
C. Galacho, M. M.L. Ribeiro Carrott, P. J.M. Carrott, I. P.P. Cansado, "Hydrothermal Stability of Ordered Mesoporous Titanosilicate Materials Prepared at Room Temperature", Advanced Materials Research, Vol. 107, pp. 63-70, 2010
Online since
April 2010
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