Reactivity of acetaldehyde at platinum and rhodium in acidic media. A DEMS study

Electrooxidation of acetaldehyde on carbon-supported Pt, PtRu and Pt3Sn and unsupported PtRu0.2 catalysts: A quantitative DEMS study

“…In the negative-going scan, the high potential peak is practically absent on the Pt electrode and the low potential peak is shifted negatively, with two distinct maxima at 0.73 and 0.64 V for polycrystalline Pt and at 0.74 and 0.60 V for the Pt/Vulcan catalyst. These general characteristics agree with previous reports for acetaldehyde oxidation on Pt [5,[7][8][9][10][11][12]14].…”

“…The detection of methane and ethane formation in the H-upd region, which have been observed for acetaldehyde adsorbate stripping in this potential region [7,14,16] and have also been reported for acetaldehyde bulk reduction [5], is hindered by the background intensity on the m/z = 15 and 30 signals arising from acetaldehyde fragmentation. Therefore, similar experiments were performed at a lower acetaldehyde concentration (0.01 M) to reduce the background intensity on these signals ( Figure 2), with a negative potential limit of 0 V. Under these conditions the Faradaic current increases at the most cathodic potentials, which is associated with methane and ethane formation.…”

“…Improving the further oxidation of acetaldehyde within the fuel cell is therefore of considerable interest for technical applications. Previous studies on acetaldehyde oxidation, however, are scarce and mostly deal with Pt electrodes [5][6][7][8][9][10][11][12][13][14]. First results on the performance of modified Pt and Pt alloy electrodes were reported in [6,15].…”

“…First results on the performance of modified Pt and Pt alloy electrodes were reported in [6,15]. In total, the studies identified two different reaction products for the oxidation of acetaldehyde, CO 2 and acetic acid [8,9,[12][13][14], while ethane and methane were observed under reductive conditions [5]. CO ad was identified as the only adsorbed reaction intermediate by IR [8][9][10]12].…”

Ethanol and Acetaldehyde Adsorption on a Carbon‐Supported Pt Catalyst: A Comparative DEMS Study

“…These results suggest that the oxidative pre-peak at 0.5 V and the oxidation reaction in the high' potential region involve oxidation of adsorbed species other than CO ad , which can be reduced in the H-upd region to methane and ethane. They agree well with previously reported DEMS data for ethanol adsorbate desorption on porous Pt [10,15,16] and polycrystalline Pt [19] electrodes. The adsorbates are tentatively identified as CH x and C 2 H y (O) species, which are possibly partly oxidized and are the result of a catalytic C-C bond dissociation (CH x ) or from the adsorption of a C 2 -species on the Pt surface [10,18].…”