No abstract

No abstract

Acetaldehyde oxidation at Pt(111) and Pt(100) follows at least two parallel reaction pathways leading to CO2 and acetic acid as soluble products. The former is produced via strongly adsorbed intermediates. Besides adsorbed CO, also species containing two C atoms, possibly η1-acetaldehyde and η1-acetyl, are formed. These species are strongly bonded to the surface. None of these adsorbates are the intermediate leading to the formation of acetic acid.

Carbon-supported PtRusMoO x nanoparticles with significant CO tolerance were prepared by a new two-step procedure: in the first step, molybdenum oxide was deposited on a carbon substrate (MoO x /C) by impregnation, and in the second one, Pt and Ru were incorporated following a colloidal method with NaHSO 3 . The composition, particle size, and crystallinity of the catalysts were determined by X-ray analytical methods (X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and total-reflection X-ray fluorescence (TXRF)), transmission electron microscopy (TEM), and thermogravimetry (TG). Conventional electrochemical techniques such as cyclic voltammetry (CV) and chronoamperometry were applied in combination with spectroscopic methods adapted to the electrochemical systems for in situ studies, such as Fourier transform infrared spectroscopy (FTIRS) and differential electrochemical mass spectrometry (DEMS). The results of this work are highly encouraging, as it is proved that a reduction of the amount of precious metals Pt and Ru is possible in parallel with a significant increase of CO tolerance in comparison with commercial catalysts.