TY - JOUR
T1 - A new preparation method of Au/ferric oxide catalyst for low temperature CO oxidation
AU - Kudo, Shinji
AU - Maki, Taisuke
AU - Yamada, Masahiro
AU - Mae, Kazuhiro
N1 - Copyright:
Copyright 2010 Elsevier B.V., All rights reserved.
PY - 2010
Y1 - 2010
N2 - A new preparation method of Au/α-Fe2O3 catalyst for CO oxidation reaction was proposed in this paper. The method includes only a simple modification of the conventional coprecipitation method, adding HAuCl4 solution after the growth of iron hydroxide grain to a certain size, but significantly influenced the catalytic activity in the reaction. In the characterization study, XRD (X-ray diffractometer) analysis, TEM (transmission electron microscope) observation, and N2 adsorption measurement showed similar results among the samples calcined at the same temperature, but the effect of the preparation method appeared in the CO adsorption measurement among the samples calcined at 200 °C. Catalysts having high CO adsorption ability also performed well in CO oxidation tests. The CO adsorption and oxidation studies indicated that the proposed preparation method results in stable and effective loading of Au, compared to the conventional coprecipitation method. In the CO oxidation test, the catalyst prepared by the proposed mixing scheme achieved complete CO conversion for more than 3000 h at 25 °C, space velocity 100,000 h-1, and 500 ppm CO. The selectivity for the CO oxidation was confirmed using reformed gas containing excess H2. In addition, the NO reduction reaction was favored over CO oxidation by the catalyst. Thus, we were able to load Au on the α-Fe2O3 effectively and demonstrate its potential as an environmental catalyst.
AB - A new preparation method of Au/α-Fe2O3 catalyst for CO oxidation reaction was proposed in this paper. The method includes only a simple modification of the conventional coprecipitation method, adding HAuCl4 solution after the growth of iron hydroxide grain to a certain size, but significantly influenced the catalytic activity in the reaction. In the characterization study, XRD (X-ray diffractometer) analysis, TEM (transmission electron microscope) observation, and N2 adsorption measurement showed similar results among the samples calcined at the same temperature, but the effect of the preparation method appeared in the CO adsorption measurement among the samples calcined at 200 °C. Catalysts having high CO adsorption ability also performed well in CO oxidation tests. The CO adsorption and oxidation studies indicated that the proposed preparation method results in stable and effective loading of Au, compared to the conventional coprecipitation method. In the CO oxidation test, the catalyst prepared by the proposed mixing scheme achieved complete CO conversion for more than 3000 h at 25 °C, space velocity 100,000 h-1, and 500 ppm CO. The selectivity for the CO oxidation was confirmed using reformed gas containing excess H2. In addition, the NO reduction reaction was favored over CO oxidation by the catalyst. Thus, we were able to load Au on the α-Fe2O3 effectively and demonstrate its potential as an environmental catalyst.
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U2 - 10.1016/j.ces.2009.05.044
DO - 10.1016/j.ces.2009.05.044
M3 - Article
AN - SCOPUS:71849096344
VL - 65
SP - 214
EP - 219
JO - Chemical Engineering Science
JF - Chemical Engineering Science
SN - 0009-2509
IS - 1
ER -