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Nanoparticulate Pd Supported Catalysts: Size-Dependent Formation of Pd(I)/Pd(O) and Their Role in CO Elimination.
- Source :
-
Journal of the American Chemical Society . 3/30/2011, Vol. 133 Issue 12, p4484-4489. 6p. - Publication Year :
- 2011
-
Abstract
- A combination of time-resolved X-ray absorption spectroscopy (XAS), hard X-ray diffraction (HXRD), diffuse reflectance infrared spectroscopy (DRIFTS), and mass spectrometry (MS) reveals a series of size-dependent phenomena at Pd nanoparticles upon CO/(NO+O2) cycling conditions. The multitechnique approach and analysis show that such size-dependent phenomena are critical for understanding Pd CO elimination behavior and, particularly, that different Pd(I) and Pd(0) centers act as active species for a size estimated by XAS to be, respectively, below and above ca. 3 nm. The relative catalytic performance of these two noble metal species indicates the intrinsic higher activity of the Pd(I) species. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00027863
- Volume :
- 133
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- Journal of the American Chemical Society
- Publication Type :
- Academic Journal
- Accession number :
- 62170716
- Full Text :
- https://doi.org/10.1021/ja110320y