Abstract
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 γ-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/Al2O3 decreased substantially with an increased dose amount of O+ or N+ . The Pd 3d5/2 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 γ- to α-Al2O3 after implanting O+ of 7.5×1018 ion g–1 .
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