Sulfated zirconia in SBA-15 structures with strong Bronsted acidity as observed by H-1 MAS NMR spectroscopy


Degirmenci V., Erdem O. F. , Yilmaz A., Michel D., Uner D.

CATALYSIS LETTERS, vol.115, pp.79-85, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 115
  • Publication Date: 2007
  • Doi Number: 10.1007/s10562-007-9078-9
  • Journal Name: CATALYSIS LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.79-85
  • Keywords: sulfated zirconia, super acid catalysts, H-1 MAS NMR, SBA-15, mesoporous silica, MESOPOROUS MOLECULAR-SIEVES, NUCLEAR-MAGNETIC-RESONANCE, N-BUTANE ISOMERIZATION, SOLID-STATE NMR, SILICA, CATALYSTS, ZEOLITES, COPOLYMER, TRIBLOCK, ZRO2
  • Middle East Technical University Affiliated: Yes

Abstract

In order to prepare high surface area highly acidic catalysts, different weight loadings of ZrO2 were incorporated in the SBA-15 structures which are subsequently sulfated by treating in 0.25 M H2SO4. The catalysts were characterized by means of TEM, XRD, N-2 adsorption, and H-1 MAS NMR. Bronsted type acidities of sulfated zirconia included SBA-15 materials were identified by a sharp H-1 MAS NMR line at 10.6 ppm. The highest acidity was obtained in the 25 mol% ZrO2 included SBA-15 catalyst with a BET surface area of 246 m(2)/g.