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
N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
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.
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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 -