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Catalysts 2018, 8(7), 266; https://doi.org/10.3390/catal8070266

Low-Temperature Activity and PdO-PdOx Transition in Methane Combustion by a PdO-PdOx/γ-Al2O3 Catalyst

1
Department of Chemistry, Columbus State University, Columbus, GA 31907, USA
2
Department of Physics, Auburn University, Auburn, AL 36849, USA
*
Author to whom correspondence should be addressed.
Received: 21 May 2018 / Revised: 18 June 2018 / Accepted: 28 June 2018 / Published: 29 June 2018
(This article belongs to the Special Issue Catalytic Oxidation of Methane)
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Abstract

The search to discover a suitable catalyst for complete combustion of methane at low temperature continues to be an active area of research. We prepared a 5 wt % PdO-PdOx/γ-Al2O3 catalyst by a modified Vortex-assisted Incipient Wetness Method. X-ray Photoelectron Spectroscopy showed that the original catalyst contained PdO (38%) and PdOx (62%) on the surface and indicated that PdOx originated from the interaction of PdO with the support. Scanning Transmission Electron Microscopy confirmed the catalyst had an average particle size of 10 nm and was well-dispersed in the support. The catalyst exhibited exceptional low-temperature activities with 90–94% methane conversion at 300–320 °C. The catalyst was active and stable after several catalytic runs with no signs of deactivation by steam in this narrow temperature range. However, the conversion decreased in the temperature range 325–400 °C. The surface composition changed to some extent after the reaction at 325 °C. A tentative mechanism proposes PdOx (Pd native oxide) as the active phase and migration of oxide ions from the support to PdO and then to PdOx during the catalytic oxidation. The high methane conversion at low temperature is attributed to the vortex method providing better dispersion, and to catalyst–support interaction producing the active phase of PdOx. View Full-Text
Keywords: methane combustion; palladium native oxide; PdOx; PdO-PdOx/γ-Al2O3 catalyst; vortex; vortex-assisted incipient wetness method methane combustion; palladium native oxide; PdOx; PdO-PdOx/γ-Al2O3 catalyst; vortex; vortex-assisted incipient wetness method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Banerjee, A.C.; McGuire, J.M.; Lawnick, O.; Bozack, M.J. Low-Temperature Activity and PdO-PdOx Transition in Methane Combustion by a PdO-PdOx/γ-Al2O3 Catalyst. Catalysts 2018, 8, 266.

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