Abstract
The synthesis of ammonia from nitrogen-hydrogen plasma prepared using radiofrequency discharge and microwave discharge was studied under the same experimental conditions except the driving frequency. Twice larger amounts of ammonia were adsorbed on zeolite used as adsorbent in the microwave discharge than in the radiofrequency discharge. Relative intensities of NH band head (A3Π−X3Σ−,0−0) as well as hydrogen atomic line (H\) observed in the plasma prepared using microwave discharge were one order of magnitude larger than those in the plasma prepared using radiofrequency discharge. Since NHx radicals and H atoms are considered ammonia precursors, the advantage of microwave discharge over radiofrequency discharge on ammonia synthesis is discussed from the results obtained above and from the plasma parameters,kT e andn e , obtained by the electric double probe technique.
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References
E. N. Eremin, A. N. Mal'tsev, and V. M. Belova,Dokl. Akad. Nauk SSSR 190, 629 (1970).
E. N. Eremin, A. N. Mal'tsev, and V. M. Belova,Russ. J. Phys. Chem. 45, 635 (1971).
G. Y. Botchway and M. Venugopalan,Z. Phys. Chem. Neue Folge 120, 103 (1980).
O. Nomura, H. Oyama, and Y. Sakamoto,Sci. Paper IPCR 75, 124 (1981).
K. S. Yin and M. Venugopalan,Plasma Chem. Plasma Process. 3, 343 (1983).
K. Miyahara,Chem. Lett., 1871 (1983).
M. Touvelle, J. L. Munoz Licea, and M. Venugopalan,Plasma Chem. Plasma Process. 7, 101 (1987).
H. Uyama, T. Uchikura, H. Niijima, and O. Matsumoto,Chem. Lett., 555 (1987).
R. L. McCarthy,J. Chem. Phys. 22, 1360 (1986).
T. Shibutami and O. Matsumoto,J. Less-Common Met. 120, 93 (1986).
T. Shibutami, Y. Kanzaki, and O. Matsumoto,J. Less-Common Met. 113, 177 (1985).
R. F. Baddour and R. H. Dundas,The Application of Plasma to Chemical Processing, R. F. Baddour and S. Timmins, eds., The MIT Press, Cambridge, Massachusetts (1967), p. 87.
K. Yamamoto and T. Okuda,J. Phys. Soc. Jpn. 11, 57 (1956).
J. L. Vossen,J. Electrochem. Soc. 126, 319 (1978).
E. J. Hellund,The Plasma State, Reinhold, New York (1961), p. 91.
R. J. Donovan and D. Husain,Chem. Rev. 70, 489 (1970).
D. Smith, N. G. Adams, and T. M. Miller,J. Chem. Phys. 69, 308 (1978).
B. D. Green and G. E. Caledonia,J. Chem. Phys. 77, 3821 (1982).
M. Venugopalan,Nucl. Instrum. Methods B 23, 405 (1987).
R. M. Clements,J. Vac. Sci. Technol. 15, 193 (1978).
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Uyama, H., Matsumoto, O. Synthesis of ammonia in high-frequency discharges. Plasma Chem Plasma Process 9, 13–24 (1989). https://doi.org/10.1007/BF01015824
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DOI: https://doi.org/10.1007/BF01015824