NDLI: The Partial Oxidation of Methane Over Pd/Al$_{2}$O$_{3}$ Catalyst Nanoparticles Studied In-Situ by Near Ambient-Pressure X-ray Photoelectron Spectroscopy

Content Provider	Springer Nature Link
Author	Price, Rachel Eralp Erden, Tuǧçe Crumlin, Ethan Rani, Sana Garcia, Sonia Smith, Richard Deacon, Liam Euaruksakul, Chanan Held, Georg
Copyright Year	2016
Abstract	Near ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS) is used to study the chemical state of methane oxidation catalysts in-situ. Al$_{2}$O$_{3}$–supported Pd catalysts are prepared with different particle sizes ranging from 4 to 10 nm. These catalysts were exposed to conditions similar to those used in the partial oxidation of methane (POM) to syn-gas and simultaneously monitored by NAP-XPS and mass spectrometry. NAP-XPS data show changes in the oxidation state of the palladium as the temperature increases, from metallic Pd$^{0}$ to PdO, and back to Pd$^{0}$. Mass spectrometry shows an increase in CO production whilst the Pd is in the oxide phase, and the metal is reduced back under presence of newly formed H$_{2}$. A particle size effect is observed, such that CH$_{4}$ conversion starts at lower temperatures with larger sized particles from 6 to 10 nm. We find that all nanoparticles begin CH$_{4}$ conversion at lower temperatures than polycrystalline Pd foil.
Starting Page	516
Ending Page	525
Page Count	10
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	59
Issue Number	5-7
e-ISSN	15729028
Language	English
Publisher	Springer US
Publisher Date	2016-01-19
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pd catalyst Methane oxidation Alumina support X-ray photoelectron spectroscopy Catalysis Physical Chemistry Pharmacy Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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