Catalyst activity of alumina-galia aerogels for selective reduction of NOx

Taro Chono, Hideaki Hamada, Masaaki Haneda, Hiroaki Imai, Hiroshi Hirashima

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Alumina gels are known to be good catalysts for the selective reduction of NOx using hydrocarbon under an oxidizing atmosphere. The effects of galia-addition on the microstructure and catalytic activity of alumina aerogels were investigated. Aerogels containing 0-66 wt% Ga2O3 were prepared by hydrolyzing Al(sec-C4H9O)3 (ASB) in an ethanol solution, adding Ga(NO3)3 dissolved in H2O, followed by supercritical drying. The catalytic activity of aerogel catalysts containing 38-51 wt% Ga2O3 was higher than pure alumina at low temperatures, 450-550°C, but decreased when the Ga2O3 content was 66 wt%. The amount of desorbed NH3, which is related to the catalytic activity, increased with increasing Ga2O3 content, but the fraction of mesopores, 20-30 nm in diameter, decreased when Ga2O3 content >60 wt%. These results show that changes in the gel microstructure caused by Ga2O3 addiction affect the catalytic activity.

Original languageEnglish
Pages (from-to)333-337
Number of pages5
JournalJournal of Non-Crystalline Solids
Volume285
Issue number1-3
DOIs
Publication statusPublished - 2001 Jun 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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