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Detection the structure-activity relationship of platinum-bismuth catalyst in methane oxidation by X-ray adsorption fine structure
- Source :
- He jishu, Vol 44, Iss 6, Pp 060102-060102 (2021)
- Publication Year :
- 2021
- Publisher :
- Science Press, 2021.
-
Abstract
- Background060102PurposeThis study aims to detect the interaction between platinum (Pt) and bismuth (Bi) species and their "structure-activity" relationship in methane oxidation through X-ray absorption fine structure (XAFS) technology.MethodsFirst of all, the CeZrLaOx support was prepared by hydrothermal method. Then, the platinum and bismuth species were deposited on the surface of CeZrLaOx support via two-step impregnation method with calcination temperature at 700 ºC. The structure-activity relationship of platinum- bismuth catalyst in methane oxidation was characterized by the X-ray diffraction (XRD), the X-ray photoelectron spectroscopy (XPS) and high angle annular dark field image-scanning transmission electron microscope (HAADF-STEM). Finally, the X-ray Absorption Fine Structure (XAFS) of samples was measured at BL14W1 beamline of Shanghai Synchrotron Radiation Facility (SSRF).ResultsExperimental results show that the dispersion of platinum through strong interaction between platinum and bismuth is enhanced by the doping of bismuth species as confirmed by XRD and hydrogen temperature program reduction (H2-TPR). However, results of XPS and HAADF-STEM indicate that overmuch Bi or BiOx species hinders the contact between platinum and methane molecule, hence leads to low activity.ConclusionsThe strong interaction between platinum and bismuth species confirmed by XAFS technique markedly enhances thermo-stability of catalysts and gives some guiding significance for the preparation of bimetallic catalysts.
Details
- Language :
- Chinese
- ISSN :
- 02533219
- Volume :
- 44
- Issue :
- 6
- Database :
- Directory of Open Access Journals
- Journal :
- He jishu
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.b5dc74ab4e484f93b23a52026cc5f7a8
- Document Type :
- article
- Full Text :
- https://doi.org/10.11889/j.0253-3219.2021.hjs.44.060102&lang=zh