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Metal Oxide-Mediated Partial Oxidation

Metal oxide-mediated oxidation of methane using air as a primary oxidant is an alternative way to produce N2-free syngas. The concept is based on the oxidation of methane by transition metal oxides in high-oxidation state yielding syngas and corresponding metal oxide in a low-oxidation state  [Pg.55]

In the second stage of the process, the metal oxide in a low-oxidation state is reoxidized by air to the original metal oxide in a high-oxidation state  [Pg.55]


On the other hand, Doblhofer218 has pointed out that since conducting polymer films are solvated and contain mobile ions, the potential drop occurs primarily at the metal/polymer interface. As with a redox polymer, electrons move across the film because of concentration gradients of oxidized and reduced sites, and redox processes involving solution species occur as bimolecular reactions with polymer redox sites at the polymer/solution interface. This model was found to be consistent with data for the reduction and oxidation of a variety of species at poly(7V-methylpyrrole). This polymer has a relatively low maximum conductivity (10-6 - 10 5 S cm"1) and was only partially oxidized in the mediation experiments, which may explain why it behaved more like a redox polymer than a typical conducting polymer. [Pg.587]

The surface complexation rate model explains the partial orders often observed for the effects of OH, and ligand concentrations on dissolution rates. There is, however, some debate about the nature of precursor sites. For oxides, Stumm and coworkers (Stumm and Furrer, 1987) have shown that in order to form a precursor site in the pH range of 4 to 6, the number of protons adsorbed at a precursor site should be the number required to form a free metal ion, e.g., three H for Al. Carrol-Webb and Walther (1988) argue that the precursor sites for AI2O3 involve only one proton at each site. Blum and Lasaga (1989) have drawn a similar conclusion about the acid-mediated dissolution of olivine and albite. [Pg.182]


See other pages where Metal Oxide-Mediated Partial Oxidation is mentioned: [Pg.55]    [Pg.180]    [Pg.55]    [Pg.222]    [Pg.133]    [Pg.165]    [Pg.56]    [Pg.185]    [Pg.354]    [Pg.366]    [Pg.181]    [Pg.230]    [Pg.664]    [Pg.387]    [Pg.13]    [Pg.334]    [Pg.96]    [Pg.133]    [Pg.29]    [Pg.150]    [Pg.5505]    [Pg.25]    [Pg.301]    [Pg.203]    [Pg.5504]    [Pg.334]    [Pg.783]    [Pg.86]    [Pg.232]    [Pg.203]    [Pg.311]    [Pg.98]    [Pg.480]    [Pg.138]    [Pg.348]    [Pg.1487]    [Pg.2001]    [Pg.404]    [Pg.572]    [Pg.287]    [Pg.234]    [Pg.350]    [Pg.746]   


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Mediated oxidation

Metal mediated

Metal oxide mediated oxidation

Oxidation mediators

Oxidation metal-mediated

Oxidation partial

Oxidative mediators

Partially oxidized

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