Control of the surface atomic population of Rh<inf>0.5</inf>Pd<inf>0.5</inf> bimetallic nanoparticles supported on CeO<inf>2</inf>
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- Control of the surface atomic population of Rh0.5</inf>Pd0.5</inf> bimetallic nanoparticles supported on CeO2</inf>
- Bernardi, Fabiano; Grass, Michael E.; Hong, Young P.; Chang, Rui; Jabeen, Naila; Zhang, Chunjuan; Eichhorn, Bryan W.; Seo, Bora; Alayoglu, Selim; Hussain, Zahid; Joo, Sang Hoon; Liu, Zhi
- Issue Date
- ELSEVIER SCIENCE BV
- CATALYSIS TODAY, v.260, pp.95 - 99
- Rh0.5Pd0.5/CeO2 bimetallic nanoparticles were subjected to reducing and oxidizing atmospheres at different temperatures and characterized by means of the Ambient Pressure X-Ray Photoelectron Spectroscopy (AP-XPS). The surface atomic population is calculated for all cases. By using a high temperature pretreatment at 480 degrees C in H-2 atmosphere, it was possible to control the surface atomic population with Pd atoms frozen at the skin layer even in an oxidizing atmosphere, which is not observed without high temperature pre-treatment (Rh atoms at the skin layer). The change of the Rh/Pd surface segregation behavior after the high temperature pre-treatment is attributed to the geometrical factor of Strong Metal Support Interaction (SMSI) effect, i.e., the occurrence of the ceria capping layer around nanoparticles.
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