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Title: Carbide-Modified Pd on ZrO2 as Active Phase for CO2-Reforming of Methane—A Model Phase Boundary Approach

Abstract

Starting from subsurface Zr0-doped “inverse” Pd and bulk-intermetallic Pd0Zr0 model catalyst precursors, we investigated the dry reforming reaction of methane (DRM) using synchrotron-based near ambient pressure in-situ X-ray photoelectron spectroscopy (NAP-XPS), in-situ X-ray diffraction and catalytic testing in an ultrahigh-vacuum-compatible recirculating batch reactor cell. Both intermetallic precursors develop a Pd0–ZrO2 phase boundary under realistic DRM conditions, whereby the oxidative segregation of ZrO2 from bulk intermetallic PdxZry leads to a highly active composite layer of carbide-modified Pd0 metal nanoparticles in contact with tetragonal ZrO2. This active state exhibits reaction rates exceeding those of a conventional supported Pd–ZrO2 reference catalyst and its high activity is unambiguously linked to the fast conversion of the highly reactive carbidic/dissolved C-species inside Pd0 toward CO at the Pd/ZrO2 phase boundary, which serves the role of providing efficient CO2 activation sites. In contrast, the near-surface intermetallic precursor decomposes toward ZrO2 islands at the surface of a quasi-infinite Pd0 metal bulk. Strongly delayed Pd carbide accumulation and thus carbon resegregation under reaction conditions leads to a much less active interfacial ZrO2–Pd0 state.

Authors:
; ; ; ; ; ; ; ; ; ORCiD logo; ; ORCiD logo; ; ORCiD logo; ; ORCiD logo
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1657295
Alternate Identifier(s):
OSTI ID: 1756367
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Catalysts
Additional Journal Information:
Journal Name: Catalysts Journal Volume: 10 Journal Issue: 9; Journal ID: ISSN 2073-4344
Publisher:
MDPI
Country of Publication:
Switzerland
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; palladium carbide; graphite; metal-support interaction; coking; palladium-zirconium intermetallic phase; in-situ X-ray photoelectron spectroscopy; in-situ X-ray diffraction; high resolution electron microscopy; dry reforming of methane; carbon dioxide activation

Citation Formats

Köpfle, Norbert, Ploner, Kevin, Lackner, Peter, Götsch, Thomas, Thurner, Christoph, Carbonio, Emilia, Hävecker, Michael, Knop-Gericke, Axel, Schlicker, Lukas, Doran, Andrew, Kober, Delf, Gurlo, Aleksander, Willinger, Marc, Penner, Simon, Schmid, Michael, and Klötzer, Bernhard. Carbide-Modified Pd on ZrO2 as Active Phase for CO2-Reforming of Methane—A Model Phase Boundary Approach. Switzerland: N. p., 2020. Web. doi:10.3390/catal10091000.
Köpfle, Norbert, Ploner, Kevin, Lackner, Peter, Götsch, Thomas, Thurner, Christoph, Carbonio, Emilia, Hävecker, Michael, Knop-Gericke, Axel, Schlicker, Lukas, Doran, Andrew, Kober, Delf, Gurlo, Aleksander, Willinger, Marc, Penner, Simon, Schmid, Michael, & Klötzer, Bernhard. Carbide-Modified Pd on ZrO2 as Active Phase for CO2-Reforming of Methane—A Model Phase Boundary Approach. Switzerland. https://doi.org/10.3390/catal10091000
Köpfle, Norbert, Ploner, Kevin, Lackner, Peter, Götsch, Thomas, Thurner, Christoph, Carbonio, Emilia, Hävecker, Michael, Knop-Gericke, Axel, Schlicker, Lukas, Doran, Andrew, Kober, Delf, Gurlo, Aleksander, Willinger, Marc, Penner, Simon, Schmid, Michael, and Klötzer, Bernhard. Wed . "Carbide-Modified Pd on ZrO2 as Active Phase for CO2-Reforming of Methane—A Model Phase Boundary Approach". Switzerland. https://doi.org/10.3390/catal10091000.
@article{osti_1657295,
title = {Carbide-Modified Pd on ZrO2 as Active Phase for CO2-Reforming of Methane—A Model Phase Boundary Approach},
author = {Köpfle, Norbert and Ploner, Kevin and Lackner, Peter and Götsch, Thomas and Thurner, Christoph and Carbonio, Emilia and Hävecker, Michael and Knop-Gericke, Axel and Schlicker, Lukas and Doran, Andrew and Kober, Delf and Gurlo, Aleksander and Willinger, Marc and Penner, Simon and Schmid, Michael and Klötzer, Bernhard},
abstractNote = {Starting from subsurface Zr0-doped “inverse” Pd and bulk-intermetallic Pd0Zr0 model catalyst precursors, we investigated the dry reforming reaction of methane (DRM) using synchrotron-based near ambient pressure in-situ X-ray photoelectron spectroscopy (NAP-XPS), in-situ X-ray diffraction and catalytic testing in an ultrahigh-vacuum-compatible recirculating batch reactor cell. Both intermetallic precursors develop a Pd0–ZrO2 phase boundary under realistic DRM conditions, whereby the oxidative segregation of ZrO2 from bulk intermetallic PdxZry leads to a highly active composite layer of carbide-modified Pd0 metal nanoparticles in contact with tetragonal ZrO2. This active state exhibits reaction rates exceeding those of a conventional supported Pd–ZrO2 reference catalyst and its high activity is unambiguously linked to the fast conversion of the highly reactive carbidic/dissolved C-species inside Pd0 toward CO at the Pd/ZrO2 phase boundary, which serves the role of providing efficient CO2 activation sites. In contrast, the near-surface intermetallic precursor decomposes toward ZrO2 islands at the surface of a quasi-infinite Pd0 metal bulk. Strongly delayed Pd carbide accumulation and thus carbon resegregation under reaction conditions leads to a much less active interfacial ZrO2–Pd0 state.},
doi = {10.3390/catal10091000},
journal = {Catalysts},
number = 9,
volume = 10,
place = {Switzerland},
year = {Wed Sep 02 00:00:00 EDT 2020},
month = {Wed Sep 02 00:00:00 EDT 2020}
}

Journal Article:
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https://doi.org/10.3390/catal10091000

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