Mesoporous alumina catalytic material prepared by grafting wide-pore MCM-41 with an alumina multilayer

M. V. Landau, E. Dafa, M. L. Kaliya, T. Sen, M. Herskowitz

Research output: Contribution to journalArticlepeer-review

74 Scopus citations

Abstract

An alumina multilayer grafted on the surface of MCM-41 produced a mesoporous material with the surface chemical functionality of alumina. The starting MCM-41 material (WPMCM) with a wide pore size distribution, a surface area of 858 m2/g, an average pore diameter of 8.2 nm and a pore volume of 1.75 cm3/g was synthesized by expanding the cetyltrimethylammonium chloride (CTAC) surfactant micelles with mesitylene at a high solubilizant/CTAC ratio of 10. Successive grafting consisting of aluminum butoxide anchoring followed by hydrolysis and calcination steps yielded a gradual increase of the aluminum content in WPMCM. Tetrahedral Al in the silica pore walls and clusters of a separate octahedral Al alumina phase were identified. Four grafting cycles produced a material with a surface area of 542 m2/g and a mean pore diameter of 4nm containing 38 wt.% Al2O3 that displayed chemical surface functionality of pure alumina. The activity of this material in the alkylation of phenol with methanol was 2.3 times higher than the activity of a reference alumina (460 m2/g). The highest activity of grafted alumina in cumene cracking and isopropanol dehydration was achieved at 21 wt.% Al2O3. Independent measurements of surface charging in aqueous solution, of [Mo7O24]6- anions adsorption and of surface acidity indicated that the material grafted with alumina and the reference alumina display similar chemical functionality.

Original languageEnglish
Pages (from-to)65-81
Number of pages17
JournalMicroporous and Mesoporous Materials
Volume49
Issue number1-3
DOIs
StatePublished - 1 Nov 2001

Keywords

  • Alumina-coated materials
  • MCM-41
  • Multi-step grafting

ASJC Scopus subject areas

  • Chemistry (all)
  • Materials Science (all)
  • Condensed Matter Physics
  • Mechanics of Materials

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