Browse > Article
http://dx.doi.org/10.7849/ksnre.2013.9.1.051

Ammonia Decomposition Over Tantalum Carbides of Hydrogen Fuel Cell  

Choi, Jeong-Gil (Department of chemical engineering and Nano-bio technology, Hannam University)
Publication Information
New & Renewable Energy / v.9, no.1, 2013 , pp. 51-59 More about this Journal
Abstract
Tantalum carbide crystallites which is to be used for $H_2$ fuel cell has been synthesized via a temperature-programmed reduction of $Ta_2O_5$ with pure $CH_4$. The resultant Ta carbide crystallites prepared using two different heating rates and space velocity exhibit the different surface areas. The $O_2$ uptake has a linear relation with surface area, corresponding to an oxygen capacity of $1.36{\times}10^{13}\;O\;cm^{-2}$. Tantalum carbide crystallites are very active for hydrogen production form ammonia decomposition reaction. Tantalum carbides are as much as two orders of magnitude more active than Pt/C catalyst (Engelhard). The highest activity has been observed at a ratio of $C_1/Ta^{{\delta}+}=0.85$, suggesting the presence of electron transfer between metals and carbon in metal carbides.
Keywords
Tantalum Carbides; Ammonia Decomposition Activity; Temperature-programmed Reduction Synthesis Method; Relation between particle size and activity;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Levy RB, Boudart M. "Platinum-like behavior of tungsten carbide in surface catalysis". Science 1973;181:547-8.   DOI   ScienceOn
2 Choi J-G, Brenner JR, Thompson LT. "Pyridine hydrodenitrogenation over molybdenum carbide catalysts". J Catal 1995;154: 33-40.   DOI   ScienceOn
3 Choi J-G. "Ammonia decomposition over vanadium carbide catalysts". J Catal 1999;182: 104-16.   DOI   ScienceOn
4 Markel EJ and Van Zee JW. "Catalytic hydrodesulfurization by molybdenum nitride". J Catal 1990;126: 643-57.   DOI   ScienceOn
5 Boudart M, Lee JS, Imura K, and Yoshida S. "The effect of surface composition on the chemisorption of hydrogen on tungsten carbide". J Catal 1987;103: 30-6.   DOI   ScienceOn
6 Choi J-G, Ha J, Hong J-W. "Synthesis and catalytic properties of vanadium interstitial compounds". Appl Catal 1998;168: 47-56.   DOI   ScienceOn
7 Singelt JH and Yates DJC. "Transition metal carbides". Nature Phys Sci 1971;229:27-31.
8 Hara Y, Minami N, and Itagaki H. "Synthesis and characterization of high-surface area tungsten carbides and application to electrocatalytic hydrogen oxidation". Appl Catal 2007;323:86-93.   DOI   ScienceOn
9 Toth LE. "Transition metal carbides and nitrides". Academic Press, New York.1971;234.
10 Choi J-G, Oh H-G, and Y-S Baek. "Tantalum hydrodenitrogenation catalysts". J of Ind. and Eng. Chem 1998;4(2):94-98.   과학기술학회마을
11 Briggs D and Seah MP. "Practical surface analysis by Auger and X-ray photoelectron spectroscopy", Wiley, New York, 1983.
12 Lee JS, Oyama MB, and Boudart M. "Molybdenum carbide catalysts:I. synthesis of unsupported powders". J Catal 1987;106: 125-33.   DOI   ScienceOn
13 Wise RS and Markel EJ. "Catalytic$NH_{3}$ decomposition by topotactic molybdenum oxides and nitrides:effect on temperature programmed $Mo_{2}N$ synthesis". J Catal 1994; 145(2): 335-43.   DOI   ScienceOn
14 Chen JG, Fruhberger MD, Weisel JE, Baumgartner BD in:The chemistry of transition metal carbides and nitrides, Blackie, New York.1996.
15 Bennett LH, Cuthill JR, McAlister AJ, and Erickson NE. "Electronic structure and catalytic behavior of tungsten carbide". Science 1974;184:563-65.   DOI   ScienceOn
16 Armstrong PA, Bell AT, and Reimer JA. "Comparison of the dynamics and orientation of chemisorbed benzene and pyridine on $\gamma-Mo_{2}N$", J. of Phys. Chem. 1993;97: 1952-6.   DOI
17 Choi J-G. "Ammonia decomposition over Ti carbides". J of the Kor Cry Growth and Cry Tech 2012; 22(6):269-73.   DOI   ScienceOn