Catalyst activity of alumina-galia aerogels for selective reduction of NOx

Taro Chono; Hideaki Hamada; Masaaki Haneda; Hiroaki Imai; Hiroshi Hirashima

doi:10.1016/S0022-3093(01)00476-8

Catalyst activity of alumina-galia aerogels for selective reduction of NO_x

Taro Chono, Hideaki Hamada, Masaaki Haneda, Hiroaki Imai, Hiroshi Hirashima

Department of Applied Chemistry

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

4 Citations (Scopus)

Abstract

Alumina gels are known to be good catalysts for the selective reduction of NO_x 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	https://doi.org/10.1016/S0022-3093(01)00476-8
Publication status	Published - 2001 Jun 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Materials Chemistry

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title = "Catalyst activity of alumina-galia aerogels for selective reduction of NOx",

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.",

author = "Taro Chono and Hideaki Hamada and Masaaki Haneda and Hiroaki Imai and Hiroshi Hirashima",

year = "2001",

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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 - 2001/6/1

Y1 - 2001/6/1

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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