Role of basic and acidic centers of MgO and modified MgO in catalytic transfer hydrogenation of ketones studied by infrared spectroscopy

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Abstract

In this study our aim was to identify the active sites and the surface species responsible for deactivation of MgO during catalytic transfer hydrogenations (CTH) of ketones using alcohols as hydrogen donors. Our previous studies showed that deactivation of MgO could be prevented by previous treatment with chloromethanes. Therefore the surface species formed during the reaction were studied before and after treatment with chloroform or chloroform-d by in situ infrared spectroscopy (IR). As a result, it was concluded that the reaction requires the presence of surface basic andacidic centers. The presence of Lewis acid centers was not necessary, the reaction could proceed on weakly acidic surface Bronsted sites, as the alterations in intensity and position of the v(OH) bands indicated. Modification with chloroform resulted also in the generation of surface OH groups with a proper acidity for the reaction. The shift in carbonyl vibrations led us to the conclusion that Lewis acid and base centers were responsible for the catalyst poisoning, so covering these acid sites by Cl- led to a stable catalyst.

Original languageEnglish
Pages (from-to)13-17
Number of pages5
JournalJournal of Molecular Structure
Volume482-483
DOIs
Publication statusPublished - May 25 1999

Keywords

  • 2-Butanone
  • 2-Propanol
  • Active centers
  • Chloroform
  • Chloroform- d
  • FT-IR spectroscopy
  • Magnesium oxide
  • Surface species

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy
  • Organic Chemistry
  • Inorganic Chemistry

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