Application of ZrO2-Al2O3 Aerogels to Catalysts

K. Kohama, Hiroaki 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 - 1999

Fingerprint

Aerogels
aerogels
catalysts
Catalysts
Xerogels
xerogels
porosity
alkoxides
drying
Pore size
diffusivity
hydrolysis
catalytic activity
Hydrolysis
Catalyst activity
Drying
Porosity
Gases
Metals
Temperature

Keywords

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

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Kohama, K., Imai, H., Hirashima, H., Hamada, H., & Inaba, M. (1999). Application of ZrO2-Al2O3 Aerogels to Catalysts. Journal of Sol-Gel Science and Technology, 13(1-3), 1033-1036.

Application of ZrO2-Al2O3 Aerogels to Catalysts. / Kohama, K.; Imai, Hiroaki; Hirashima, H.; Hamada, H.; Inaba, M.

In: Journal of Sol-Gel Science and Technology, Vol. 13, No. 1-3, 1999, p. 1033-1036.

Research output: Contribution to journalArticle

Kohama, K, Imai, H, Hirashima, H, Hamada, H & Inaba, M 1999, 'Application of ZrO2-Al2O3 Aerogels to Catalysts', Journal of Sol-Gel Science and Technology, vol. 13, no. 1-3, pp. 1033-1036.
Kohama K, Imai H, Hirashima H, Hamada H, Inaba M. Application of ZrO2-Al2O3 Aerogels to Catalysts. Journal of Sol-Gel Science and Technology. 1999;13(1-3):1033-1036.
Kohama, K. ; Imai, Hiroaki ; Hirashima, H. ; Hamada, H. ; Inaba, M. / Application of ZrO2-Al2O3 Aerogels to Catalysts. In: Journal of Sol-Gel Science and Technology. 1999 ; Vol. 13, No. 1-3. pp. 1033-1036.
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