Kinetics of methanol oxidation

This results from the slow kinetics of methanol oxidation and oxygen reduction. An additional loss is due to the cell resistance (arising mainly... 

Kauranen, R, E. Skou, and J. Munk, Kinetics of methanol oxidation on carbon-supported Pt and Pt + Ru catalysts, J. Electroanal. Chem., 404, 1 (1996). 

For potentials higher than 0.5 V vs. RHE, the formation of adsorbed oxygen species at Ru as well as at Pt will block the catalytic surface, leading to a decrease in the methanol adsorption kinetics. Therefore, in a potential range higher than 0.5 V vs. RHE, the kinetics of methanol oxidation is optimized at a Ru-poor catalyst, because methanol adsorption is not blocked and because the presence of Ru provides the extra oxygen atom needed to complete the oxidation of adsorbed CO to CO2. 

High area platinum showed different voltammetric features from smooth platinum for methanol oxidation and provided slightly higher sustained current density. These results provided evidences that the morphology of platinum affects the mechanisms and the kinetics of methanol oxidation. 

Robb, D. A. and P. Harriott. 1974. The kinetics of methanol oxidation on a supported silver catalyst. J. Catal. 35 176-183. 

Fundamental Kinetics of Methanol Oxidation in Supercritical Water... 

At high anodic overpotentials, methanol oxidation reaction exhibits strongly non-Tafel behavior owing to finite and potential-independent rate of methanol adsorption on catalyst surface [244]. The equations of Section 8.2.3 can be modified to take into account the non-Tafel kinetics of methanol oxidation. The results reveal an interesting regime of the anode catalyst layer operation featuring a variable thickness of the current-generating domain [245]. The experimental verification of this effect, however, has not yet been performed. 

Steady state kinetics of methanol oxidation over the supported vanadia catalysts... 

The TPRS experiments also provided additional insights into the kinetics of methanol oxidation over the supported vanadia catalysts. The TPRS experiments only provide kinetics about the surface reaction steps since the adsorption events precede the initiation of the transient temperature ramp. The TPRS peak temperatures for the production of HjCO and CO from the different vanadia catalysts are presented in Table 4. 

Reaction mechanism and kinetics of methanol oxidation to fonnaldehyde... 

The kinetics of methanol oxidation over metal oxide catalysts were elegantly derived by Holstein and Machiels [16], The kinetic analysis demonstrated that the dissociative adsorption of water must be included to obtain an accurate kinetic model. The reaction mechanism can be represented by three kinetic steps equilibrated dissociative adsorption of methanol to a surface methoxy and surface hydroxyl (represented by K,), equilibrated dissociative adsorption of water to two surface hydroxyls (represented by K ), and the irreversible hydrogen abstraction of the surface methoxy intermediate to the formaldehyde product and a surface hydroxyl (the rate determining step, represented by kj). For the case of a fully oxidized surface, the following kinetic expression was derived ... 

The three main barriers to the reduction of superior energy density of existing DMFC have been [35] (1) high methanol permeability of the commonly used ionomeric membranes (2) the balance of water challenge, due to the need of removing water produced in the cathode and needed in the anode (3) the moderate power density of the DMFC, due to the slow kinetics of methanol oxidation. 

Webley, P. A. Tester, J. W. (1989) Fundamental Kinetics of Methanol Oxidation in Supercritical Water. In Supercritical Fluid Science and Technology, K. P. Johnston and J. M. L. Penninger, Ed. American Chemical Society Washington, DC, Vol. 406 pp 259-275. 

In this paper, we had employed binary carbon supports to fabricate thin film electrodes in DMFCs. The roles of binary carbon supports and an optimal mixing ratio will be evaluated and characterized through cyclic voltammetry measurements. It will be shown that with the usage of two carbon supports, electrochemical activities and loading contents of catalysts can be enhanced. This improvement is further exemplified by the enhanced electrode kinetics of methanol oxidation for a binary carbon support-electrode in comparison to a single support-electrode. 

One of the key problems in DMFC technology is sluggish kinetics of methanol oxidation. In spite of several decades of studies (Bagotzky and Vasilyev, 1967 Gasteiger et al., 1993 Kauranen et al., 1996), the reaction mechanism of methanol oxidation is still not fully understood. 

The simplest way to take the adsorption step into account in the kinetics of methanol oxidation is as follows. Consider the two-stage reaction scheme ... 

S. (2012) Kinetics of methanol oxidation over mesoporous perovskite catalysts. ChemCatChem, 4 (3), 387-394. 

The kinetics of methanol oxidation is not as fast as the kinetics of hydrogen oxidation in hydrogen/air PEMFC. In order to make DMFCs viable, the kinetics of methanol electrooxidation must be enhanced. 

The kinetic of methanol oxidation [17] is determined by the fact that the product... 

I.E. Wachs, (2003) Extending surface science studies to industrial reaction conditions mechanism and kinetics of methanol oxidation over silver surface . Surface Science, 544,1. ... 

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