Synthesis Dependent Core Level Binding Energy Shift in the Oxidation State of Platinum Coated on Ceria–Titania and its Effect on Catalytic Decomposition of Methanol

Journal Article · Sat Nov 20 04:00:00 EST 2010 · Applied Catalysis. A, General

DOI:https://doi.org/10.1016/j.apcata.2010.08.060· OSTI ID:1028587

Karakoti, A S; King, Jessica; Vincent, Abhilash; Seal, Sudipta

Synergistic interaction of catalyst and support has attracted the interest of the catalytic community for several decades. The decomposition/oxidation of alcohols for the production of hydrogen as a source of fuel requires such support catalyst interaction. Recent studies have suggested the active role of oxide based supports on the catalytic ability of noble metals such as gold, platinum and palladium. Herein, we report the effect of synthesis technique on the catalytic activity of platinum coated on mixed ceria-titania support system. Wet impregnation technique followed by calcination was compared with the chemical reduction of platinum during the coating over oxide support. Methanol decomposition studied using an in-house built catalytic reactor coupled to a mass spectrometer showed that catalyst prepared by thermal reduction of platinum demonstrated better catalytic ability than the catalyst prepared by chemical reduction of platinum. Transmission electron microscopy revealed that the size of both platinum and ceria-titania particles remained unchanged, while the X-ray photoelectron spectroscopy (XPS) revealed that the oxidation state of platinum was modified by different coating procedures. A shift in the core level binding energy of the Pt 4f towards lower binding energy was observed with chemical reduction. Based on the XPS data it was found that platinum (on ceria-titania supports) in mixed oxidation state outperformed the Pt in reduced metallic state. Results from catalysis and in situ Fourier transform infra red spectroscopy are presented and discussed.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1028587
• Journal Information: Applied Catalysis. A, General, Journal Name: Applied Catalysis. A, General Journal Issue: 1-2 Vol. 388; ISSN ACAGE4; ISSN 0926-860X
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
10 SYNTHETIC FUELS
ALCOHOLS
BINDING ENERGY
CALCINATION
CATALYSIS
CATALYSTS
COATINGS
Environmental Molecular Sciences Laboratory
GOLD
HYDROGEN
IMPREGNATION
MASS SPECTROMETERS
METHANOL
OXIDES
PALLADIUM
PLATINUM
PRODUCTION
SPECTROSCOPY
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
VALENCE
X-RAY PHOTOELECTRON SPECTROSCOPY