Polymer-templated synthesis of hollow Pd-CeO2 nanocomposite spheres and their catalytic activity and thermal stabilityElectronic supplementary information (ESI) available: TEM images: Pd NPs and their size distribution (Fig. S1); Pd NPs on resin polymer spheres (Fig. S2); h-Pd-CeO2 NCSs treated with NaBH4 and then N2 at 650 °C (Fig. S6), after being used in reduction of 4-NP (Fig. S10) and CO oxidation (Fig. S11); a mixture of Pd + CeO2 (Fig. S7); Pd/CeO2-imp (Fig. S8). XPS spectra: h-Pd-CeO2 NC
Developing methods for the fabrication of active and thermally stable noble metal/metal oxide nanomaterials are very important for catalysis and material fields. Herein, we used a polymer-template synthesis approach to prepare hollow Pd-CeO 2 nanocomposite spheres (NCSs) with Pd nanoparticles evenly...
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| Main Authors | , , , , |
|---|---|
| Format | Journal Article |
| Language | English |
| Published |
17.11.2015
|
| Online Access | Get full text |
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| Summary: | Developing methods for the fabrication of active and thermally stable noble metal/metal oxide nanomaterials are very important for catalysis and material fields. Herein, we used a polymer-template synthesis approach to prepare hollow Pd-CeO
2
nanocomposite spheres (NCSs) with Pd nanoparticles evenly distributed inside the CeO
2
shell, in which the aggregation of Pd nanoparticles can be well inhibited with the help of the protection of CeO
2
nanocrystallites even after being calcined at 700 °C. The Pd nanoparticles are partially buried in the CeO
2
shell and the surface Pd species are highly ionic, which is caused by the electron exchange at the Pd-CeO
2
interface during calcination. This hollow structure Pd-CeO
2
nanocatalyst shows excellent catalytic activity and stability in the aqueous selective reduction of 4-nitrophenol and gaseous CO oxidation. For the selective reduction of 4-nitrophenol, the reaction rate of this h-Pd-CeO
2
NCS catalyst compared to those of the supported Pd/CeO
2
and physically mixed Pd + CeO
2
catalysts is almost 14 times and 5 times faster, respectively. For the CO oxidation, the larger Pd-CeO
2
interface in h-Pd-CeO
2
NCSs could facilitate the reaction between the adsorbed CO and O
2
, thus showing better low temperature activity. This paper emphasizes the advantages of a core-shell hollow structure and provides a new way for obtaining novel functional nanocatalysts.
Hollow structured Pd-CeO
2
nanomaterials show an enhanced catalytic activity and stability in the selective reduction of 4-nitrophenol and CO oxidation. |
|---|---|
| Bibliography: | NCSs (Pd 3d, Fig. S5) and Pd/CeO imp (O 1s, Fig. S12). TG curves and EDS line-scanning profiles of h-Pd-CeO NCSs (Fig. S3 and S4). Textural properties and crystallite sizes of catalysts (Table S1). See DOI imp (Fig. S8). XPS spectra: h-Pd-CeO NCSs treated with NaBH and then N 10.1039/c5ta05092h imp (Pd 3d, Fig. S9); h-Pd-CeO Electronic supplementary information (ESI) available: TEM images: Pd NPs and their size distribution (Fig. S1); Pd NPs on resin polymer spheres (Fig. S2); h-Pd-CeO at 650 °C (Fig. S6), after being used in reduction of 4-NP (Fig. S10) and CO oxidation (Fig. S11); a mixture of Pd + CeO 2 4 (Fig. S7); Pd/CeO NCSs and Pd/CeO |
| ISSN: | 2050-7488 2050-7496 |
| DOI: | 10.1039/c5ta05092h |