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 language | English |
|---|---|
| Pages (from-to) | 333-337 |
| Number of pages | 5 |
| Journal | Journal of Non-Crystalline Solids |
| Volume | 285 |
| Issue number | 1-3 |
| DOIs | |
| Publication status | Published - 2001 Jun |
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ASJC Scopus subject areas
- Ceramics and Composites
- Electronic, Optical and Magnetic Materials
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Catalyst activity of alumina-galia aerogels for selective reduction of NOx. / Chono, Taro; Hamada, Hideaki; Haneda, Masaaki; Imai, Hiroaki; Hirashima, Hiroshi.
In: Journal of Non-Crystalline Solids, Vol. 285, No. 1-3, 06.2001, p. 333-337.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Catalyst activity of alumina-galia aerogels for selective reduction of NOx
AU - Chono, Taro
AU - Hamada, Hideaki
AU - Haneda, Masaaki
AU - Imai, Hiroaki
AU - Hirashima, Hiroshi
PY - 2001/6
Y1 - 2001/6
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0035369504&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0035369504&partnerID=8YFLogxK
U2 - 10.1016/S0022-3093(01)00476-8
DO - 10.1016/S0022-3093(01)00476-8
M3 - Article
AN - SCOPUS:0035369504
VL - 285
SP - 333
EP - 337
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
SN - 0022-3093
IS - 1-3
ER -