Formation of Epitaxial PdO(100) During the Oxidation of Pd(100)
(2023) In The Journal of Physical Chemistry Letters 14(38). p.8493-8499- Abstract
- The catalytic oxidation of CO and CH4 can be strongly influenced by the structures of oxide phases that form on metallic catalysts during reaction. Here, we show that an epitaxial PdO(100) structure forms at temperatures above 600 K during the oxidation of Pd(100) by gaseous O atoms as well as exposure to O2-rich mixtures at millibar partial pressures. The oxidation of Pd(100) by gaseous O atoms preferentially generates an epitaxial, multilayer PdO(101) structure at 500 K, but initiating Pd(100) oxidation above 600 K causes an epitaxial PdO(100) structure to grow concurrently with PdO(101) and produces a thicker and rougher oxide. We present evidence that this change in the oxidation behavior is caused by a... (More)
- The catalytic oxidation of CO and CH4 can be strongly influenced by the structures of oxide phases that form on metallic catalysts during reaction. Here, we show that an epitaxial PdO(100) structure forms at temperatures above 600 K during the oxidation of Pd(100) by gaseous O atoms as well as exposure to O2-rich mixtures at millibar partial pressures. The oxidation of Pd(100) by gaseous O atoms preferentially generates an epitaxial, multilayer PdO(101) structure at 500 K, but initiating Pd(100) oxidation above 600 K causes an epitaxial PdO(100) structure to grow concurrently with PdO(101) and produces a thicker and rougher oxide. We present evidence that this change in the oxidation behavior is caused by a temperature-induced change in the stability of small PdO domains that initiate oxidation. Our discovery of the epitaxial PdO(100) structure may be significant for developing relationships among oxide structure, catalytic activity, and reaction conditions for applications of oxidation catalysis. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/9d4cae56-8c83-44cc-ab30-6b4f603fa67f
- author
- organization
- publishing date
- 2023-09-18
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- chemical structure, epitaxy, oxidation, oxides, surface analysis
- in
- The Journal of Physical Chemistry Letters
- volume
- 14
- issue
- 38
- pages
- 7 pages
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- pmid:37721973
- scopus:85174640403
- ISSN
- 1948-7185
- DOI
- 10.1021/acs.jpclett.3c01958
- language
- English
- LU publication?
- yes
- id
- 9d4cae56-8c83-44cc-ab30-6b4f603fa67f
- date added to LUP
- 2023-10-25 15:26:51
- date last changed
- 2023-12-14 10:11:36
@article{9d4cae56-8c83-44cc-ab30-6b4f603fa67f, abstract = {{The catalytic oxidation of CO and CH<sub>4</sub> can be strongly influenced by the structures of oxide phases that form on metallic catalysts during reaction. Here, we show that an epitaxial PdO(100) structure forms at temperatures above 600 K during the oxidation of Pd(100) by gaseous O atoms as well as exposure to O<sub>2</sub>-rich mixtures at millibar partial pressures. The oxidation of Pd(100) by gaseous O atoms preferentially generates an epitaxial, multilayer PdO(101) structure at 500 K, but initiating Pd(100) oxidation above 600 K causes an epitaxial PdO(100) structure to grow concurrently with PdO(101) and produces a thicker and rougher oxide. We present evidence that this change in the oxidation behavior is caused by a temperature-induced change in the stability of small PdO domains that initiate oxidation. Our discovery of the epitaxial PdO(100) structure may be significant for developing relationships among oxide structure, catalytic activity, and reaction conditions for applications of oxidation catalysis.}}, author = {{Mehar, Vikram and Edström, Helen and Shipilin, Mikhail and Hejral, Uta and Wu, Chengjun and Kadiri, Aravind and Albertin, Stefano and Hagman, Benjamin and von Allmen, Kim and Weigmann, Tim and Pfaff, Sebastian and Drnec, Jakub and Zetterberg, Johan and Lundgren, Edvin and Merte, Lindsay and Gustafson, Johan and Weaver, Jason}}, issn = {{1948-7185}}, keywords = {{chemical structure; epitaxy; oxidation; oxides; surface analysis}}, language = {{eng}}, month = {{09}}, number = {{38}}, pages = {{8493--8499}}, publisher = {{The American Chemical Society (ACS)}}, series = {{The Journal of Physical Chemistry Letters}}, title = {{Formation of Epitaxial PdO(100) During the Oxidation of Pd(100)}}, url = {{http://dx.doi.org/10.1021/acs.jpclett.3c01958}}, doi = {{10.1021/acs.jpclett.3c01958}}, volume = {{14}}, year = {{2023}}, }