Silicate xerogels containing cobalt as heterogeneous catalysts for the side-chain oxidation of alkyl aromatic compounds with tert-butyl hydroperoxide

Marina Rogovin, Ronny Neumann

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

New transition metal substituted silicate xerogels, ML(n) -SiO2, have been prepared by the sol-gel technique and have been used as heterogeneous catalysts for the side-chain oxidation of alkyl arches with anhydrous t- butylhydroperoxide. The cobalt substituted silicates were the most active and selective, for example, ethylbenzene was cleanly oxidized to acetophenone at 65% conversion and > 99% selectivity. The metal salt precursor used was a key factor in determining the activity of the metallosilicate. Diffuse reflectance UV-vis and IR measurements indicated that when using Co(OSV)2 as metal precursor, the acetate group was detached from the metal and Co(II) was tetrahedral and site substituted in the silicate network. Addition of the oxidant led to stabilization of a Co(III) oxidation state and/or retention of the tetrahedral configuration.

Original languageEnglish
Pages (from-to)315-318
Number of pages4
JournalJournal of Molecular Catalysis A: Chemical
Volume138
Issue number2-3
DOIs
Publication statusPublished - Feb 5 1999

Fingerprint

tert-Butylhydroperoxide
Silicates
Xerogels
xerogels
aromatic compounds
Aromatic compounds
Cobalt
silicates
cobalt
Metals
catalysts
Oxidation
oxidation
Catalysts
metals
arches
Ethylbenzene
Arches
Oxidants
Sol-gels

Keywords

  • Alkyl arenes
  • Catalytic oxidation
  • Metallosilicates
  • Peroxide
  • Side-chain oxidation

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

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title = "Silicate xerogels containing cobalt as heterogeneous catalysts for the side-chain oxidation of alkyl aromatic compounds with tert-butyl hydroperoxide",
abstract = "New transition metal substituted silicate xerogels, ML(n) -SiO2, have been prepared by the sol-gel technique and have been used as heterogeneous catalysts for the side-chain oxidation of alkyl arches with anhydrous t- butylhydroperoxide. The cobalt substituted silicates were the most active and selective, for example, ethylbenzene was cleanly oxidized to acetophenone at 65{\%} conversion and > 99{\%} selectivity. The metal salt precursor used was a key factor in determining the activity of the metallosilicate. Diffuse reflectance UV-vis and IR measurements indicated that when using Co(OSV)2 as metal precursor, the acetate group was detached from the metal and Co(II) was tetrahedral and site substituted in the silicate network. Addition of the oxidant led to stabilization of a Co(III) oxidation state and/or retention of the tetrahedral configuration.",
keywords = "Alkyl arenes, Catalytic oxidation, Metallosilicates, Peroxide, Side-chain oxidation",
author = "Marina Rogovin and Ronny Neumann",
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T1 - Silicate xerogels containing cobalt as heterogeneous catalysts for the side-chain oxidation of alkyl aromatic compounds with tert-butyl hydroperoxide

AU - Rogovin, Marina

AU - Neumann, Ronny

PY - 1999/2/5

Y1 - 1999/2/5

N2 - New transition metal substituted silicate xerogels, ML(n) -SiO2, have been prepared by the sol-gel technique and have been used as heterogeneous catalysts for the side-chain oxidation of alkyl arches with anhydrous t- butylhydroperoxide. The cobalt substituted silicates were the most active and selective, for example, ethylbenzene was cleanly oxidized to acetophenone at 65% conversion and > 99% selectivity. The metal salt precursor used was a key factor in determining the activity of the metallosilicate. Diffuse reflectance UV-vis and IR measurements indicated that when using Co(OSV)2 as metal precursor, the acetate group was detached from the metal and Co(II) was tetrahedral and site substituted in the silicate network. Addition of the oxidant led to stabilization of a Co(III) oxidation state and/or retention of the tetrahedral configuration.

AB - New transition metal substituted silicate xerogels, ML(n) -SiO2, have been prepared by the sol-gel technique and have been used as heterogeneous catalysts for the side-chain oxidation of alkyl arches with anhydrous t- butylhydroperoxide. The cobalt substituted silicates were the most active and selective, for example, ethylbenzene was cleanly oxidized to acetophenone at 65% conversion and > 99% selectivity. The metal salt precursor used was a key factor in determining the activity of the metallosilicate. Diffuse reflectance UV-vis and IR measurements indicated that when using Co(OSV)2 as metal precursor, the acetate group was detached from the metal and Co(II) was tetrahedral and site substituted in the silicate network. Addition of the oxidant led to stabilization of a Co(III) oxidation state and/or retention of the tetrahedral configuration.

KW - Alkyl arenes

KW - Catalytic oxidation

KW - Metallosilicates

KW - Peroxide

KW - Side-chain oxidation

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