1460
ZAKHARCHENKO
is limited by diffusion of ammonia toward the outer
surface of the catalyst. Therefore, the specific surface
area has no significant influence on the selectivity of
the iron gallium catalyst with respect to nitrogen(II)
oxide [1 3, 5, 6, 17], i.e., the decrease in selectivity
at 1173 K is mainly due to phase and chemical trans-
formations of the catalyst. Under critical conditions of
the reaction (catalyst decay ), recrystallization proc-
esses and decrease in the specific surface area of the
catalyst diminish its limiting load, i.e., activity, from
ventor’s Certificates)), Moscow: NIITEKhIM, 1972.
9. Zasorin, A.P., Zakharchenko, N.I., and Karava-
ev, M.M., Izv. Vyssh. Uchebn. Zaved, Khim. Khim.
Tekhnol., 1980, vol. 23, no. 10, pp. 1274 1276.
10. Alkhazov, T. G., Gasan-zade, G.Z., Osmanov, M.O.,
and Sultanov, M.Yu., Kinet. Katal., 1975, vol. 16,
no. 6, pp. 1230 1234.
11. Buyanova, N.E., Karnaukhov, A.P., and Alabu-
zhev, Yu.A., Opredelenie udel’noi poverkhnosti kata-
lizatorov (Determination of Specific Surface Area of
Catalysts), Moscow: Khimiya, 1973.
3
3
3
2 1
9.58 10 to 1.87 10 m NH (h m ) (90 h of
3
operation).
12. Boreskov, G.K., Geterogennyi kataliz (Heterogeneous
Catalysis), Moscow: Nauka, 1986.
13. Bogdanovich, N.P., Vorob’ev, Yu.P., Men’, A.N.,
et al., Opt. Spektrosk., 1970, vol. 29, no. 6, pp. 1151
1153.
14. Zakharchenko, N.I., Izv. Vyssh. Uchebn. Zaved., Khim.
Khim. Tekhnol., 2001, vol. 44, no. 2, pp. 126 129.
CONCLUSIONS
(1) A study of factors responsible for deactivation
of an iron gallium oxide catalyst (97.0 wt % Fe O ,
3.0 wt % Ga O ) in high-temperature oxidation of
2
3
2
3
15. Golodets, G.I., Geterogenno-kataliticheskie reaktsii
s uchastiem molekulyarnogo kisloroda (Heterogene-
ous-Catalytic Reactions Involving Molecular Oxy-
gen), Kiev: Naukova Dumka, 1977.
ammonia demonstrated that the catalyst undergoes
phase and chemical transformations leading to forma-
tion of low-selective magnetite and volatile gallium(I)
oxide. The deactivation process is accompanied by
structural changes: recrystallization and decrease in
the specific surface area of the system.
16. Il’chenko, N.I., Pyatnitskii, Yu.I., and Pavlenko, N.V.,
Teor. Eksp. Khim., 1998, vol. 34, no. 5, pp. 265 281.
17. Zakharchenko, N.I., Funct. Mater., 2002, vol. 9, no. 2,
(2) Data on the deactivation of the catalyst can be
used in developing theoretical and practical founda-
tions for design of high-performance catalysts for
ammonia oxidation.
pp. 255 263.
18. Ivanova, R.V., Khimiya i tekhnologiya galliya (Chem-
istry and Technology of Gallium), Moscow: Metallur-
giya, 1973.
19. Zakharchenko, N.I. and Protiven’, I.N., Termodinami-
cheskii analiz kataliticheskikh sistem MeO Fe2O3,
gde Me Ve, Mg, Ca, v usloviyakh vozdeistviya reak-
tsionnoi sredy (Thermodynamic Analysis of Catalytic
Systems MeO Fe2O3 (Me = Be, Mg, Ca) under Con-
ditions of Effect of the Reaction Medium), Available
from NIITEKhIM, Cherkassy, June 17, 1993, no. 128
93-khp.
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