期刊
CATALYSIS TODAY
卷 410, 期 -, 页码 102-108出版社
ELSEVIER
DOI: 10.1016/j.cattod.2022.04.028
关键词
Rh overlayer; Three-way catalyst; Ce; Oxygen storage; release capability
In this study, the surface modification of a nanometric Rh overlayer by a small amount of Ce was found to enhance its three-way catalytic activity. The oxygen storage/release behavior of the surface Ce contributed to buffering the air-to-fuel change and improving the catalytic activity. The Ce-modified Rh overlayer with a metal honeycomb structure exhibited high activity even under A/F perturbation conditions at high space velocity, making it a promising and energy-saving alternative to conventional catalytic converters.
A nanometric Rh overlayer exhibits excellent three-way catalytic activity under stoichiometric conditions. However, dynamic changes in the air-to-fuel (A/F) ratio under experimental conditions deteriorates the catalytic activity caused by the lack of oxygen storage/release capability of Rh. In this study, we first report that the surface modification of the Rh overlayer by a small amount of Ce using a sequential metal deposition technique based on the pulsed arc-plasma method enhances its three-way catalytic activity under A/F perturbation con-ditions. X-ray photoelectron spectroscopy and X-ray absorption fine structure measurements revealed that the redox behavior of the surface Ce contributed to an oxygen storage/release and buffered the A/F change. The Ce-modified Rh overlayer with a metal honeycomb structure exhibited high activity for the three-way catalytic reaction even under A/F perturbation conditions at high space velocity. This novel catalytic converter is expected to be significantly process and energy saving compared to the conventional catalytic converter. Thus, the oxygen storage/release performance, heat resistance, and low-temperature activity can be improved by controlling the surface composition.
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