TITLE:
Formation of Platinum (Pt) Nanocluster Coatings on K-OMS-2 Manganese Oxide Membranes by Reactive Spray Deposition Technique (RSDT) for Extended Stability during CO Oxidation
AUTHORS:
Hector F. Garces, Justin Roller, Cecil K. King’ondu, Saminda Dharmarathna, Roger A. Ristau, Rishabh Jain, Radenka Maric, Steven L. Suib
KEYWORDS:
Manganese Oxide Membrane; Pt Nanostructures; Reactive Spray Deposition Technology (RSDT); Film Deposition; X-Ray Tomography
JOURNAL NAME:
Advances in Chemical Engineering and Science,
Vol.4 No.1,
January
13,
2014
ABSTRACT: Nanocluster formation of a metallic platinum (Pt)
coating, on manganese oxide inorganic membranes impregnated with multiwall
carbon nanotubes (K-OMS-2/MWCNTs), applied by reactive spray deposition
technology (RSDT) is discussed. RSDT applies thin films of Pt nanoclusters on
the substrate; the thickness of the film can be easily controlled. The
K-OMS-2/MWCNTs fibers were enclosed by the thin film of Pt. X-ray diffraction
(XRD), scanning electron microscopy/X-ray energy dispersive spectroscopy
(SEM/XEDS), focus ion beam/scanning electron microscopy (FIB/SEM), transmission
electron microscopy (TEM), and X-ray 3D micro-tomography (MicroXCT) which have
been used to characterize the resultant Pt/K-OMS-2/MWCNTs membrane. The non-destructive
characterization technique (MicroXCT) resolves the Pt layer on the upper layer
of the composite membrane and also shows that the membrane is composed of
sheets superimposed into stacks. The nanostructured coating on the composite
membrane material has been evaluated for carbon monoxide (CO) oxidation. The
functionalized Pt/K-OMS-2/MWCNTs membranes show excellent conversion (100%) of
CO to CO2 at a lower temperature 200℃ compared to the uncoated
K-OMS-2/MWCNTs. Moreover, the Pt/K-OMS-2/MWCNTs membranes show outstanding
stability, of more than 4 days, for CO oxidation at 200℃.