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
Citations
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Journal ArticleDOI
Copper catalysts in the selective hydrogenation of soybean and rapeseed oils: II. The effect of a hydrogen flow over copper chromite catalyst
L. E. Johansson,S. T. Lundin +1 more
TL;DR: In this paper, the authors showed that the time required for hydrogenation of soybean and rapeseed oils to 1.2% linolenate content with a copper chromite catalyst is reduced 40-60% if the dead-end system is replaced with a procedure using a flow of hydrogen through the reactor.
Book ChapterDOI
Reduction of Hexagonal WO3 by Hydrogen Spillover : Formation of New Hydrogen Hexagonal Tungsten Bronzes HxWO3
B. Gerand,M. Figlarz +1 more
TL;DR: In this paper, a new hexagonal form of tungsten trioxide by hydrogen spillover has been investigated on platinized oxide, where hydrogen atoms enter in the empty structural tunnels of the oxide as protons and donate electrons to the conduction band.
Journal ArticleDOI
Preparation and characterization TiOx–Pt/C catalyst for hydrogen oxidation reaction
TL;DR: The hydrogen oxidation reaction for an investigated catalyst proceeded as an electrochemically reversible reaction and the quite similar, homogenous distribution and particle size were obtained for Pt/C doped by TiO(x) catalyst which was the confirmation that TiO (x) post-deposition did not lead to significant growth of the Pt nanoparticles.
Journal ArticleDOI
Hydrogen spillover effects in the reduction of iron oxide
TL;DR: In this paper, it was shown that freshly formed metal accelerates the rate of reduction of ferric oxide in the presence of water vapour, and this effect was explained on the basis of the spillover of hydrogen from the metal sites to the oxide phase through "portholes" of water.
Book ChapterDOI
A new model on the nature of spilt-over hydrogen
U. Roland,Frank Roessner +1 more
TL;DR: In this paper, a new model on the nature of spilt-over hydrogen (H * ) is proposed based on the evluation of a wide variety of experimental results.