skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Selective reduction of NO with propene over Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3}: Effect of sol-gel method on the catalytic performance

Abstract

The effect of the preparation method on the activity of Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3} for the selective reduction of NO with propene was investigated. Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3} prepared by the sol-gel method (Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3}(S)) exhibited excellent activity for NO reduction, compared with Al{sub 2}O{sub 3}, Ga{sub 2}O{sub 3}, and impregnated Ga{sub 2}O{sub 3}/Al{sub 2}O{sub 3} (Ga{sub 2}O{sub 3}/Al{sub 2}O{sub 3}(I)). XRD measurements of Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3}(S) indicated that a part of the Al{sup 3+} ions in Al{sub 2}O{sub 3} are substituted by Ga{sup 3+} ions, resulting in the formation of a composite oxide, [Ga{sub x}Al{sub (1{minus}x)}]{sub 2}O{sub 3} (x < 1). On the other hand, Ga{sub 2}O{sub 3} particles and Al{sub 2}O{sub 3} particles were found to be present separately for Ga{sub 2}O{sub 3}/Al{sub 2}O{sub 3}(I). The high catalytic activity of Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3}(S) was accounted for by the high surface area and the nature of the [Ga{sub x}Al{sub (1{minus}x)}]{sub 2}O{sub 3} (x < 1) composite oxide, which was formed uniformly by the present sol-gel method. The comparison of the reactivity between NO and NO{sub 2} suggested the participation of NO{sub 2} in NO reduction. The kinetic order for NOmore » reduction was found to be 0.3 with respect to propene and 0.7 with respect to oxygen on both Ga{sub 2}O{sub 3}/Al{sub 2}O{sub 3}(I) and Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3}(S). However, a significant difference in the reaction order with respect to NO was observed between Ga{sub 2}O{sub 3}/Al{sub 2}O{sub 3}(I) and Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3}(S), 0.4 order on the former catalyst, and zero order on the latter one, indicating the presence of strongly adsorbed NOx species on the catalyst surface. On the basis of these results, a reaction mechanism was proposed in which the NOx adspecies formed through NO oxidation is reduced to nitrogen via organic intermediates containing nitrogen and oxygen.« less

Authors:
; ; ;
Publication Date:
Research Org.:
National Inst. of Materials and Chemical Research, Tsukuba, Ibaraki (JP)
OSTI Identifier:
20076099
Resource Type:
Journal Article
Journal Name:
Journal of Catalysis
Additional Journal Information:
Journal Volume: 192; Journal Issue: 1; Other Information: PBD: 15 May 2000; Journal ID: ISSN 0021-9517
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 54 ENVIRONMENTAL SCIENCES; NITRIC OXIDE; SELECTIVE CATALYTIC REDUCTION; GALLIUM OXIDES; ALUMINIUM OXIDES; CATALYTIC EFFECTS; SOL-GEL PROCESS; CHEMICAL REACTION KINETICS; AIR POLLUTION CONTROL; EXHAUST GASES

Citation Formats

Haneda, Masaaki, Kintaichi, Yoshiaki, Shimada, Hiromichi, and Hamada, Hideaki. Selective reduction of NO with propene over Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3}: Effect of sol-gel method on the catalytic performance. United States: N. p., 2000. Web. doi:10.1006/jcat.2000.2831.
Haneda, Masaaki, Kintaichi, Yoshiaki, Shimada, Hiromichi, & Hamada, Hideaki. Selective reduction of NO with propene over Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3}: Effect of sol-gel method on the catalytic performance. United States. doi:10.1006/jcat.2000.2831.
Haneda, Masaaki, Kintaichi, Yoshiaki, Shimada, Hiromichi, and Hamada, Hideaki. Mon . "Selective reduction of NO with propene over Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3}: Effect of sol-gel method on the catalytic performance". United States. doi:10.1006/jcat.2000.2831.
@article{osti_20076099,
title = {Selective reduction of NO with propene over Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3}: Effect of sol-gel method on the catalytic performance},
author = {Haneda, Masaaki and Kintaichi, Yoshiaki and Shimada, Hiromichi and Hamada, Hideaki},
abstractNote = {The effect of the preparation method on the activity of Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3} for the selective reduction of NO with propene was investigated. Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3} prepared by the sol-gel method (Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3}(S)) exhibited excellent activity for NO reduction, compared with Al{sub 2}O{sub 3}, Ga{sub 2}O{sub 3}, and impregnated Ga{sub 2}O{sub 3}/Al{sub 2}O{sub 3} (Ga{sub 2}O{sub 3}/Al{sub 2}O{sub 3}(I)). XRD measurements of Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3}(S) indicated that a part of the Al{sup 3+} ions in Al{sub 2}O{sub 3} are substituted by Ga{sup 3+} ions, resulting in the formation of a composite oxide, [Ga{sub x}Al{sub (1{minus}x)}]{sub 2}O{sub 3} (x < 1). On the other hand, Ga{sub 2}O{sub 3} particles and Al{sub 2}O{sub 3} particles were found to be present separately for Ga{sub 2}O{sub 3}/Al{sub 2}O{sub 3}(I). The high catalytic activity of Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3}(S) was accounted for by the high surface area and the nature of the [Ga{sub x}Al{sub (1{minus}x)}]{sub 2}O{sub 3} (x < 1) composite oxide, which was formed uniformly by the present sol-gel method. The comparison of the reactivity between NO and NO{sub 2} suggested the participation of NO{sub 2} in NO reduction. The kinetic order for NO reduction was found to be 0.3 with respect to propene and 0.7 with respect to oxygen on both Ga{sub 2}O{sub 3}/Al{sub 2}O{sub 3}(I) and Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3}(S). However, a significant difference in the reaction order with respect to NO was observed between Ga{sub 2}O{sub 3}/Al{sub 2}O{sub 3}(I) and Ga{sub 2}O{sub 3}-Al{sub 2}O{sub 3}(S), 0.4 order on the former catalyst, and zero order on the latter one, indicating the presence of strongly adsorbed NOx species on the catalyst surface. On the basis of these results, a reaction mechanism was proposed in which the NOx adspecies formed through NO oxidation is reduced to nitrogen via organic intermediates containing nitrogen and oxygen.},
doi = {10.1006/jcat.2000.2831},
journal = {Journal of Catalysis},
issn = {0021-9517},
number = 1,
volume = 192,
place = {United States},
year = {2000},
month = {5}
}