Application of ZrO2-Al2O3 Aerogels to Catalysts

K. Kohama, H. Imai, H. Hirashima, H. Hamada, M. Inaba

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

ZrO2-Al2O3 aerogels were prepared by hydrolysis of metal alkoxides in alcoholic solutions and supercritical drying in order to obtain an improved de-NOx catalyst with high activity in a wide temperature range. The aerogels have about 20-50% higher activity than the xerogels in the range 300-600°C. The higher activity of aerogels may be attributed to the higher effective gas diffusivity in them, estimated to be about 20-60 times higher than that of the xerogels, because of their high porosity and large pore size. The catalytic activity of aerogels containing 4-10 mol% ZrO2 is more than 20% higher than that of Al2O3 aerogels at temperatures <450°C.

Original languageEnglish
Pages (from-to)1033-1036
Number of pages4
JournalJournal of Sol-Gel Science and Technology
Volume13
Issue number1-3
Publication statusPublished - 1998 Jan

Keywords

  • Aerogel
  • Catalyst
  • Selective reduction of NO
  • ZrO-AlO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry

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  • Cite this

    Kohama, K., Imai, H., Hirashima, H., Hamada, H., & Inaba, M. (1998). Application of ZrO2-Al2O3 Aerogels to Catalysts. Journal of Sol-Gel Science and Technology, 13(1-3), 1033-1036.