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CeO2 nanorods-supported transition metal catalysts for CO oxidation.

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Title: CeO2 nanorods-supported transition metal catalysts for CO oxidation.
Authors: Mock, Samantha A.1, Sharp, Shannon E.1, Stoner, Thomas R.1, Radetic, Michael J.1, Zell, Elizabeth T.1, Wang, Ruigang1 rwang01@ysu.edu
Source: Journal of Colloid & Interface Science. Mar2016, Vol. 466, p261-267. 7p.
Subjects: Cesium oxide, Transition metal catalysts, Carbon oxides, Hydrothermal synthesis, Electron microscopy
Abstract: A catalytically active oxide support in combination with metal catalysts is required in order to achieve better low temperature activity and selectivity. Here, we report that CeO 2 nanorods with a superior surface oxygen release/storage capability were used as an active support of transition metal (TM) catalysts (Mn, Fe, Co, Ni, Cu) for CO oxidation reaction. The as-prepared CeO 2 nanorods supported 10 wt% TM catalysts were highly active for CO oxidation at low temperature, except for the Fe sample. It is found that the 10%Cu–CeO 2 catalyst performed best, and it provided a lower light-off temperature with T50 (50% conversion) at 75 °C and T100 (100% conversion) of CO to CO 2 at 194 °C. The atomic level surface structure of CeO 2 nanorods was investigated in order to understand the improved low temperature catalytic activity. The richness of surface roughness and various defects (voids, lattice distortion, bending, steps, twinning) on CeO 2 nanorods could facilitate oxygen release and storage. According to XRD and Raman analysis, copper species migrate into the bulk CeO 2 nanorods to a greater degree. Since CO adsorbed over the surface of the catalyst/support is detrimental to its catalytic activity, the surface defects on the CeO 2 nanorods and CeO 2 -TM interactions were critical to the enhanced activity. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:A catalytically active oxide support in combination with metal catalysts is required in order to achieve better low temperature activity and selectivity. Here, we report that CeO 2 nanorods with a superior surface oxygen release/storage capability were used as an active support of transition metal (TM) catalysts (Mn, Fe, Co, Ni, Cu) for CO oxidation reaction. The as-prepared CeO 2 nanorods supported 10 wt% TM catalysts were highly active for CO oxidation at low temperature, except for the Fe sample. It is found that the 10%Cu–CeO 2 catalyst performed best, and it provided a lower light-off temperature with T50 (50% conversion) at 75 °C and T100 (100% conversion) of CO to CO 2 at 194 °C. The atomic level surface structure of CeO 2 nanorods was investigated in order to understand the improved low temperature catalytic activity. The richness of surface roughness and various defects (voids, lattice distortion, bending, steps, twinning) on CeO 2 nanorods could facilitate oxygen release and storage. According to XRD and Raman analysis, copper species migrate into the bulk CeO 2 nanorods to a greater degree. Since CO adsorbed over the surface of the catalyst/support is detrimental to its catalytic activity, the surface defects on the CeO 2 nanorods and CeO 2 -TM interactions were critical to the enhanced activity. [ABSTRACT FROM AUTHOR]
ISSN:00219797
DOI:10.1016/j.jcis.2015.12.026