Application of ZrO2-Al2O3 Aerogels to Catalysts

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

Application of ZrO₂-Al₂O₃ Aerogels to Catalysts

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

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

11 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-NO_x 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 language	English
Pages (from-to)	1033-1036
Number of pages	4
Journal	Journal of Sol-Gel Science and Technology
Volume	13
Issue number	1-3
Publication status	Published - 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

Cite this

@article{2f06b995d9a94bdabdecbc0df789c4d9,

title = "Application of ZrO2-Al2O3 Aerogels to Catalysts",

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.",

keywords = "Aerogel, Catalyst, Selective reduction of NO, ZrO-AlO",

author = "K. Kohama and H. Imai and H. Hirashima and H. Hamada and M. Inaba",

year = "1998",

month = jan,

language = "English",

volume = "13",

pages = "1033--1036",

journal = "Journal of Sol-Gel Science and Technology",

issn = "0928-0707",

publisher = "Springer Netherlands",

number = "1-3",

}

TY - JOUR

T1 - Application of ZrO2-Al2O3 Aerogels to Catalysts

AU - Kohama, K.

AU - Imai, H.

AU - Hirashima, H.

AU - Hamada, H.

AU - Inaba, M.

PY - 1998/1

Y1 - 1998/1

N2 - 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.

AB - 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.

KW - Aerogel

KW - Catalyst

KW - Selective reduction of NO

KW - ZrO-AlO

UR - http://www.scopus.com/inward/record.url?scp=0032306260&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032306260&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0032306260

SN - 0928-0707

VL - 13

SP - 1033

EP - 1036

JO - Journal of Sol-Gel Science and Technology

JF - Journal of Sol-Gel Science and Technology

IS - 1-3

ER -

Application of ZrO₂-Al₂O₃ Aerogels to Catalysts

Abstract

Keywords

ASJC Scopus subject areas

Other files and links

Fingerprint

Cite this