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In situ NAP-XPS spectroscopy during methane dry reforming on ZrO 2 /Pt(1 1 1) inverse model catalyst.
In situ NAP-XPS spectroscopy during methane dry reforming on ZrO 2 /Pt(1 1 1) inverse model catalyst.
- Source :
-
Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2018 Jul 04; Vol. 30 (26), pp. 264007. Date of Electronic Publication: 2018 May 22. - Publication Year :
- 2018
-
Abstract
- Due to the need of sustainable energy sources, methane dry reforming is a useful reaction for conversion of the greenhouse gases CH <subscript>4</subscript> and CO <subscript>2</subscript> to synthesis gas (CO + H <subscript>2</subscript> ). Syngas is the basis for a wide range of commodity chemicals and can be utilized for fuel production via Fischer-Tropsch synthesis. The current study focuses on spectroscopic investigations of the surface and reaction properties of a ZrO <subscript>2</subscript> /Pt inverse model catalyst, i.e. ZrO <subscript>2</subscript> particles (islands) grown on a Pt(1 1 1) single crystal, with emphasis on in situ near ambient pressure x-ray photoelectron spectroscopy (NAP-XPS) during MDR reaction. In comparison to technological systems, model catalysts facilitate characterization of the surface (oxidation) state, surface adsorbates, and the role of the metal-support interface. Using XPS and infrared reflection absorption spectroscopy we demonstrated that under reducing conditions (UHV or CH <subscript>4</subscript> ) the ZrO <subscript>2</subscript> particles transformed to an ultrathin ZrO <subscript>2</subscript> film that started to cover (wet) the Pt surface in an SMSI-like fashion, paralleled by a decrease in surface/interface oxygen. In contrast, (more oxidizing) dry reforming conditions with a 1:1 ratio of CH <subscript>4</subscript> and CO <subscript>2</subscript> were stabilizing the ZrO <subscript>2</subscript> particles on the model catalyst surface (or were even reversing the strong metal support interaction (SMSI) effect), as revealed by in situ XPS. Carbon deposits resulting from CH <subscript>4</subscript> dissociation were easily removed by CO <subscript>2</subscript> or by switching to dry reforming conditions (673-873 K). Thus, at these temperatures the active Pt surface remained free of carbon deposits, also preserving the ZrO <subscript>2</subscript> /Pt interface.
Details
- Language :
- English
- ISSN :
- 1361-648X
- Volume :
- 30
- Issue :
- 26
- Database :
- MEDLINE
- Journal :
- Journal of physics. Condensed matter : an Institute of Physics journal
- Publication Type :
- Academic Journal
- Accession number :
- 29786619
- Full Text :
- https://doi.org/10.1088/1361-648X/aac6ff