Paper Titles
Hydrogels Based on 2-Hydroxyethyl Methacrylate Obtained by Gamma Irradiation
p.199
Electrochemical Study of Hydrogen Electrode Reaction Kinetics on LmNi3.55Co0.75Mn0.4Al0.3 Alloy Electrode
p.205
Microstructural and Mechanical Properties of Ti3Al-Based Intermetallics Produced by Powder Metallurgy
p.211
Crack Growth Resistance of Overaged Al-Zn-Mg-Cu Alloys
p.217
Formic Acid Oxidation on Pt/Ru Nanoparticles: Temperature Effects
p.223
Particle Size Effect: Methanol Oxidation on Supported Pt Catalysts
p.229
Morphology and Capacitive Properties of [RuOxHy/Low Surface Area Carbon Black] Composite Materials Prepared by Sol Gel Procedure
p.235
Comparative Potentiodynamic Study of Nickel and Hydrogen Underpotential Deposition at Polycrystalline Platinum Electrode in Weak Acid and Neutral Solutions
p.241
Flowability of Electrolytic Copper Powder
p.247

Formic Acid Oxidation on Pt/Ru Nanoparticles: Temperature Effects

Article Preview

Abstract:

The formic acid oxidation on Pt/Ru nanoparticles in acid solution over the temperature range 298-333 K has been studied by thin-film rotating disk method (RDE). Transmission electron microscopy in combination with scanning tunneling microscopy was used to determine the size (4.3 ± 0.3 nm) and shape (cuboctahedral) of the particles. Kinetic analysis revealed that at elevated temperatures (313 K, 333 K) the reaction rate is much higher than at room temperature (295 K), indicating that formic acid oxidation on supported Pt/Ru catalyst is a highly activated process. Based on experimental kinetic parameters we propose that the HCOOH oxidation on the PtRu alloy most likely follows a dual pathway, but the branching ratio is still very high, i.e. Pt-like. The principal effect of opening the dehydration channel at steady-state (via the presence of Ru in the surface) is to lower the coverage of COads on Pt sites and permit the dehydrogenation path to increase in rate.

You might also be interested in these eBooks
Current Research in Advanced Materials and Processes View Preview

Info:

Periodical:

Materials Science Forum (Volume 494)

Pages:

223-228

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.494.223

Citation:

Cite this paper

Online since:

September 2005

Authors:

A.V. Tripković, K.Dj. Popović, J.D. Lović, N.M. Marković, Velimir Radmilović

Keywords:

Effect of Temperature, Formic Acid Oxidation, Supported Pt/Ru Catalyst

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2005 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] R. Parsons and T. VanderNoot, J. Electroanal. Chem., 257 (1988), p.9.

Google Scholar

[2] M.F. Mrozek, H. Luo, M.J. Weaver, Langmuir, 16 (2000), p.8463.

Google Scholar

[3] T. Iwasita, X. Xia, E. Herrero, H.D. Liess, Langmuir, 12 (1996), p.4260.

Google Scholar

[4] T. Iwasita, Electrochim. Acta, 47 (2002), p.3663.

Google Scholar

[5] R.R. Adžić, A.V. Tripković, N.M. Marković J. Electroanal. Chem., 150 (1983), p.79.

Google Scholar

[6] A, Tripković, K. Popović, R.R. Adžić, J. Chim. Phys., 88 (1991), p.1635.

Google Scholar

[7] R. Adžić, A.V. Tripković, W. O'Grady, Nature, 296 (1982), p.137.

Google Scholar

[8] H.A. Gasteiger, N. Marković, P.N. Ross, E.J. Cairns, Electrochim. Acta, 39 (1994), p.1825.

Google Scholar

[9] N. Marković, H.A. Gasteiger, P.N. Ross, X. Jiang, I. Villegas, M.J. Weaver, Electrochim. Acta, 40 (1995), p.91.

Google Scholar

[10] H.A. Gasteiger, N. Marković, P.N. Ross Jr., E.J. Cairns, J. Phys. Chem., 98 (1994), p.617.

Google Scholar

[11] D. Pletcher, V. Solis, J. Electroanal. Chem., 131 (1982), p.309.

Google Scholar

[12] C. Lamy, J.M. Leger, J. Chim. Phys., 88 (1991), p.1649.

Google Scholar

[13] T.J. Schmidt, R.J. Behm, B.N. Grgur, N.M. Marković, P.N. Ross Jr., Langmuir, 16 (2000), p.8159.

Google Scholar

[14] V. Radmilović, H.A. Gasteiger, P.N. Ross, J. Catal., 154 (1995), p.98.

Google Scholar

[15] A.V. Tripković, S. Štrbac, K. Dj. Popović, Electrochemistry Communication, 5 (2003), p.484.

Google Scholar

[16] N.M. Marković, P.N. Ross, Surface Sci. Rep., 45 (2002), p.117.

Google Scholar

[17] G. Ertl, M. Neumann, K. Streit, Surface Sci., 64 (1977), p.393.

Google Scholar

[18] B.A. Sexton, Surface Sci., 102 (1981), p.271.

Google Scholar