Cerium containing MCM-41-type mesoporous materials and their acidic and redox catalytic properties

S. C. Laha, P. Mukherjee, S. R. Sainkar, R. Kumar

Research output: Contribution to journalArticle

196 Citations (Scopus)

Abstract

The syntheses of cerium containing MCM-41 mesoporous molecular sieves (Ce-MCM-41) were carried out using different hydrothermal methods. However, the Ce-MCM-41 samples were mainly prepared by refluxing the gel mixture at atmospheric pressure under stirring (∼600 rpm). For comparison, the syntheses were also carried out in autoclave under autogeneous pressure both in static and in stirring conditions. Powder X-ray diffraction (XRD), N2 adsorption, diffuse reflectance UV-visible (UV-vis) spectroscopy, IR spectroscopy, solid state magic-angle spinning nuclear magnetic resonance spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectrometry (EDX), transmission electron microscopy and thermogravimetric analyses of the samples reveal that well-ordered MCM-41-type mesoporous materials were prepared and Ce is incorporated presumably into the framework position and/or into the walls of silica matrix of MCM-41 structure. The EDX analyses of the samples confirm the presence of Ce in the Ce-MCM-41 samples. Typical XRD patterns of MCM-41-type hexagonal structures and high BET surface areas (983-1414 m2 g-1) with isotherms of type IV of these materials indicate the presence of hexagonal mesopores in the samples. The presence of a strong absorption band centered at ca. 300 nm and the absence of any absorption band at ca. 400 nm in the diffuse reflectance UV-vis spectra indicate the presence of tetra-coordinated cerium in the silica network of Ce-MCM-41 samples. The Ce-MCM-41 samples are active as catalysts for vapor-phase dehydration of cyclohexanol to cyclohexene and hydroxylation of 1-naphthol with aqueous H2O2 and tert-butyl hydroperoxide.

Original languageEnglish (US)
Pages (from-to)213-223
Number of pages11
JournalJournal of Catalysis
Volume207
Issue number2
DOIs
StatePublished - 2002
Externally publishedYes

Fingerprint

Cerium
Mesoporous materials
Multicarrier modulation
cerium
absorbents
Molecular sieves
stirring
x ray spectroscopy
Silicon Dioxide
Absorption spectra
silicon dioxide
absorption spectra
reflectance
Cyclohexanols
Silica
autoclaves
tert-Butylhydroperoxide
Naphthol
magnetic resonance spectroscopy
Hydroxylation

Keywords

  • Catalytic activity
  • Cerium
  • Dehydration of cyclohexanol
  • Hydroxylation of 1-naphthol
  • Synthesis of MCM-41

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Cerium containing MCM-41-type mesoporous materials and their acidic and redox catalytic properties. / Laha, S. C.; Mukherjee, P.; Sainkar, S. R.; Kumar, R.

In: Journal of Catalysis, Vol. 207, No. 2, 2002, p. 213-223.

Research output: Contribution to journalArticle

Laha, S. C. ; Mukherjee, P. ; Sainkar, S. R. ; Kumar, R. / Cerium containing MCM-41-type mesoporous materials and their acidic and redox catalytic properties. In: Journal of Catalysis. 2002 ; Vol. 207, No. 2. pp. 213-223.
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AU - Sainkar, S. R.

AU - Kumar, R.

PY - 2002

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N2 - The syntheses of cerium containing MCM-41 mesoporous molecular sieves (Ce-MCM-41) were carried out using different hydrothermal methods. However, the Ce-MCM-41 samples were mainly prepared by refluxing the gel mixture at atmospheric pressure under stirring (∼600 rpm). For comparison, the syntheses were also carried out in autoclave under autogeneous pressure both in static and in stirring conditions. Powder X-ray diffraction (XRD), N2 adsorption, diffuse reflectance UV-visible (UV-vis) spectroscopy, IR spectroscopy, solid state magic-angle spinning nuclear magnetic resonance spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectrometry (EDX), transmission electron microscopy and thermogravimetric analyses of the samples reveal that well-ordered MCM-41-type mesoporous materials were prepared and Ce is incorporated presumably into the framework position and/or into the walls of silica matrix of MCM-41 structure. The EDX analyses of the samples confirm the presence of Ce in the Ce-MCM-41 samples. Typical XRD patterns of MCM-41-type hexagonal structures and high BET surface areas (983-1414 m2 g-1) with isotherms of type IV of these materials indicate the presence of hexagonal mesopores in the samples. The presence of a strong absorption band centered at ca. 300 nm and the absence of any absorption band at ca. 400 nm in the diffuse reflectance UV-vis spectra indicate the presence of tetra-coordinated cerium in the silica network of Ce-MCM-41 samples. The Ce-MCM-41 samples are active as catalysts for vapor-phase dehydration of cyclohexanol to cyclohexene and hydroxylation of 1-naphthol with aqueous H2O2 and tert-butyl hydroperoxide.

AB - The syntheses of cerium containing MCM-41 mesoporous molecular sieves (Ce-MCM-41) were carried out using different hydrothermal methods. However, the Ce-MCM-41 samples were mainly prepared by refluxing the gel mixture at atmospheric pressure under stirring (∼600 rpm). For comparison, the syntheses were also carried out in autoclave under autogeneous pressure both in static and in stirring conditions. Powder X-ray diffraction (XRD), N2 adsorption, diffuse reflectance UV-visible (UV-vis) spectroscopy, IR spectroscopy, solid state magic-angle spinning nuclear magnetic resonance spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectrometry (EDX), transmission electron microscopy and thermogravimetric analyses of the samples reveal that well-ordered MCM-41-type mesoporous materials were prepared and Ce is incorporated presumably into the framework position and/or into the walls of silica matrix of MCM-41 structure. The EDX analyses of the samples confirm the presence of Ce in the Ce-MCM-41 samples. Typical XRD patterns of MCM-41-type hexagonal structures and high BET surface areas (983-1414 m2 g-1) with isotherms of type IV of these materials indicate the presence of hexagonal mesopores in the samples. The presence of a strong absorption band centered at ca. 300 nm and the absence of any absorption band at ca. 400 nm in the diffuse reflectance UV-vis spectra indicate the presence of tetra-coordinated cerium in the silica network of Ce-MCM-41 samples. The Ce-MCM-41 samples are active as catalysts for vapor-phase dehydration of cyclohexanol to cyclohexene and hydroxylation of 1-naphthol with aqueous H2O2 and tert-butyl hydroperoxide.

KW - Catalytic activity

KW - Cerium

KW - Dehydration of cyclohexanol

KW - Hydroxylation of 1-naphthol

KW - Synthesis of MCM-41

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