Journal ArticleDOI
Adlineation, Portholes and Spillover
TLDR
In this article, the role of water in the Pt-WO3 system was investigated and it was shown that if the WO3 was mixed with platinum black and also if water was preadsorbed on the mixture prior to admitting hydrogen to the system, the reduction did not take place at all at room temperature.Abstract:
It was found that yellow WOs could be reduced at room temperature by molecular hydrogen to form blue solids, the hydrogen analogs of tungsten bronzes with a molar composition of H0.35WO3. But this was possible only if the WO3 was mixed with platinum black and also if water was preadsorbed on the mixture prior to admitting hydrogen to the system. If either one of these conditions was not satisfied, reduction did not take place at all at room temperature. Additional observations of spillover in this and similar systems are reported in this paper. They throw more light on the role of water in the Pt— WO3 system, show the generality of the phenomenon and stress its importance in adsorption, solid state reactions and surface catalysis.read more
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Book ChapterDOI
Toluene Hydrogenation Over Supported Platinum Catalysts
S.-D. Lin,M. A. Vannice +1 more
TL;DR: In this paper, the specific activity for toluene hydrogenation on supported Pt depended on the support utilized and followed the sequence: Pt/SiO2-Al2O3-Pt/TiO2/Pit/Al 2O3 ≥ Pt/NiO2.
Journal ArticleDOI
Interaction of O2 with LSM–YSZ Composite Materials and Oxygen Spillover Effect
TL;DR: In this paper, the interaction between gas phase oxygen and LSM-YSZ composite catalytic materials was studied by the in situ method based on isotope equilibria, and the results showed that LSM is La 0.6Sr0.4MnO3±δ; YSZ is ZrO2·Y2O3 electrolyte.
Journal ArticleDOI
Reaction of molecular hydrogen with the 100 face of MoO3: I. Kinetics in the low pressure range (10−8–10−6 Torr) in the presence of platinum particles
TL;DR: In this paper, three successive processes are observed when the 100 face of a MoO3 single crystal covered with a specific density of platinum particles of known diameter is exposed to molecular hydrogen in a pressure (P) domain between 10−8 and 10−6 Torr.
Journal ArticleDOI
Primary Oxide Latent Storage and Spillover Enabling Electrocatalysts with Reversible Oxygen Electrode Properties and the Alterpolar Revertible (PEMFC versus WE) Cell
Milan M. Jakšić,Gianluigi A. Botton,Georgios D. Papakonstantinou,Feihong Nan,Jelena M. Jaksic +4 more
TL;DR: In this paper, it was shown that in the course of cathodic oxygen reduction (ORR), all along the reversible potential range (the low slope Tafel plots, about 30 mVs/dec), nanostructured Pt electrocatalyst is covered by the interfering primary (Pt−OH) and surface oxide mixture, while the higher polarization characterizes electrocatalytic surface deprived from these oxides and, consequently, the reaction mechanism of direct electron exchange on clean electrode surface.