Concentration of surface hydroxyl groups on MCM-41

A. Jentys, K. Kleestorfer, H. Vinek

Research output: Contribution to journalArticlepeer-review

149 Scopus citations

Abstract

The type and concentration of hydroxyl groups present on MCM-41 were investigated by infrared spectroscopy as a function of the Si/Al ratio and the pore size. The purely siliceous samples contained the highest concentrations of weakly acidic silanol groups. On aluminum-containing MCM-41 samples additionally Brønsted and strong Lewis acid sites were observed. Their concentration increased with increasing aluminum content, while that of the weakly acidic silanol groups decreased. For MCM-41 samples prepared with C12TMABr, higher concentrations of weakly acidic hydroxyl groups and strong Lewis acid sites, and lower concentrations of Brønsted acid sites, were observed compared with MCM-41 prepared with C16TMABr. Comparison of the spectroscopic data with the results of a structure simulation revealed that the internal surface of MCM-41 is only partially covered with hydroxyl groups.

Original languageEnglish
Pages (from-to)321-328
Number of pages8
JournalMicroporous and Mesoporous Materials
Volume27
Issue number2-3
DOIs
StatePublished - Feb 1999
Externally publishedYes

Keywords

  • Infrared spectroscopy
  • MCM-41
  • Structure simulation
  • Surface hydroxyl groups

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