Grain boundary control in nanocrystalline MgO as a novel means for significantly enhancing surface basicity and catalytic activity

Roxana Vidruk, Miron V. Landau, Moti Herskowitz, Michael Talianker, Nahum Frage, Vladimir Ezersky, Natali Froumin

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

The grain boundaries in nanocrystalline MgO were formed by dehydration of densified magnesium hydroxide aerogel. Its configuration was regulated by controlling the contact interface between the nanocrystals in the hydroxide precursor. The materials with high contact interface were obtained by application of chemical (multiple aerogel condensation) and physical (pressing) densification methods. Formation of distorted zones at the grain boundaries areas in the MgO densification process increased its surface basicity by as much as 8 times at a crystal domain size of 5 nm. The grain boundaries contribution to the creation of coordinative unsaturated surface ions and vacancies in nanocrystalline MgO was determined by a variety of physical and chemical methods. The significant increase of surface basicity yielded a major enhancement of catalytic activity of densified MgO material measured in Knoevenagel condensation of benzaldehyde with malononitrile and transesterification of phenyl acetate with 1-phenylethanol.

Original languageEnglish
Pages (from-to)196-204
Number of pages9
JournalJournal of Catalysis
Volume263
Issue number1
DOIs
StatePublished - 1 Apr 2009

Keywords

  • Basicity
  • Catalyst
  • Grain boundaries
  • MgO

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

Fingerprint

Dive into the research topics of 'Grain boundary control in nanocrystalline MgO as a novel means for significantly enhancing surface basicity and catalytic activity'. Together they form a unique fingerprint.

Cite this