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The Partial Oxidation of Methane Over Pd/Al2O3 Catalyst Nanoparticles Studied In-Situ by Near Ambient-Pressure X-ray Photoelectron Spectroscopy

DOI: 10.1007/s11244-015-0520-8 DOI Help

Authors: Rachel Price (University of Reading) , Tugce Eralp-erden (Johnson Matthey Technology Centre,) , Ethan Crumlin (Advanced Light Source) , Sana Rani (Advanced Light Source) , Sonia Garcia (Johnson Matthey Technology Centre) , Richard Smith (Johnson Matthey Technology Centre) , Liam Deacon (Diamond Light Source) , Chanan Euaruksakul (University of Reading; Diamond Light Source) , Georg Held (University of Reading; Diamond Light Source)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Topics In Catalysis , VOL 59 , PAGES 516 - 525

State: Published (Approved)
Published: March 2016

Open Access Open Access

Abstract: Near ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS) is used to study the chemical state of methane oxidation catalysts in-situ. Al2O3–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 Pd0 to PdO, and back to Pd0. 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 H2. A particle size effect is observed, such that CH4 conversion starts at lower temperatures with larger sized particles from 6 to 10 nm. We find that all nanoparticles begin CH4 conversion at lower temperatures than polycrystalline Pd foil.

Journal Keywords: Pd catalyst; Methane oxidation; Alumina support; X-ray photoelectron spectroscopy

Subject Areas: Chemistry

Facility: Advanced Light Source