Methane combustion activity of alumina supported Pt, Pd, and Rh catalysts modified by high-energy ion beam irradiation

被引：5
|
作者：
Machida, M
Taniguchi, H
Kijima, T
Nakatani, J
机构：
[1] Miyazaki Univ, Dept Mat Sci, Miyazaki 88921, Japan
[2] Toray Ind Inc, Chem Res Labs, Nagoya, Aichi 455, Japan
来源：
JOURNAL OF MATERIALS CHEMISTRY | 1998年 / 8卷 / 03期
关键词：
D O I：
10.1039/a706503e
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
100 keV O+ or N+ ion implantation was used to study the irradiation effect on the methane combustion activity of 1 mass%Pd, Pt, and Rh supported on gamma-Al2O3. The catalytic activity of both Pt/Al2O3 and Rh/Al2O3 was enhanced by the implantation, probably due to the improved dispersion of noble metals. On the other hand, the activity of Pd/Al(2)O3 decreased substantially with an increased dose amount of O+ or N+. The Pd 3d(5/2) XPS measurement demonstrated that the as-prepared catalyst contains PdO, which is reduced to Pd metal with increasing ion implantation. This irradiation-induced reaction process also resulted in not only a significant increase of the Pd particle size from 3 to 20 nm, but also a phase transformation of gamma- to alpha-Al2O3 after implanting O+ of 7.5 x 10(18) ion g(-1).
引用
收藏
页码：781 / 785
页数：5
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