1504
EGIAZAROV et al.
oxide phase containing Pd Pd and Pd O bonds was
formed after treatment of a palladium-containing
zeolite with a mixture of 1% CO and air at 100
4. Egiazarov, Yu.G., Kravchuk, L.S., Radkevich, V.Z.,
et al., Zh. Prikl. Khim., 2002, vol. 75, no. 1, pp. 34
38.
2
00 C. The activity of the palladium-containing zeo-
5. Kravchuk, L.S., Radkevich, V.Z., Lusenko, G.N., and
Ivko, A.A., Vysokomol. Soedin., Ser. A, 2002, vol. 44,
no. 4, pp. 648 654.
lite was found to linearly increase with the ratio of O2
and CO chemisorbed on the metal surface [21]. The
fact that the catalytic activity of 2.5Pd/H-K-1 and
6
. Soldatov, V.S., Pokrovskaya, A.I., and Martsinke-
vich, R.V., Zh. Prikl. Khim., 1984, vol. 57, no. 9,
pp. 2030 2034.
2
.5Pd/Mg-K-1 in H oxidation increases after high-
2
temperature treatment of these catalysts with the reac-
tion mixture is probably due to formation on Pd par-
ticles of a thin oxide layer which readily chemisorbs
oxygen.
7
. Veshtort, V.Z., Shingel’, I.A., Savchits, M.F., and
Egiazarov, Yu.G., Zavod. Lab., 1989, vol. 55, no. 10,
pp. 6 8.
The activity of 2.5Pd/Mg-K-1 remains the same
and the activity of 2.5Pd/H-K-1 sharply decreases
after treatment at higher temperature (from 180 to
8. Karpov, O.N., Tulupov, P.E., and Volkov, V.I., Zh.
Fiz. Khim., 1971, vol. 45, no. 7, pp. 1750 1763.
9. Polyanskii, N.G., Tulupov, P.E., Sadovskaya, G.K.,
and Slovokhotov, N.A., Zh. Prikl. Khim., 1965, vol.
38, no. 4, pp. 910 918.
2
50 C). This decrease in the catalytic activity (see
table) is clearly due to thermal degradation of the
H form, which starts, as shown above, at temperatures
higher than 180 C.
10. Saldadze, K.M., Polyanskii, N.G., and Pashkov, A.B.,
in Khromatografiya, ee teoriya i primenenie (Chroma-
tography, Its Theory and Application), Moscow:
Akad. Nauk SSSR, 1960, pp. 77 82.
CONCLUSIONS
1
1. Tulupov, P.E., Stoikost’ ionoobmennykh materialov
Stability of Ion-Exchange Materials), Moscow:
(
(1) The presence of reduced palladium in the H
Khimiya, 1984.
and Mg forms of FIBAN K-1 fibrous sulfonic cation
exchanger enhances their thermal stability. The onset
temperature of thermolysis of both the sulfo groups
and the hydrocarbon matrix of the H form increases as
well as the onset temperature of thermolysis of the
hydrocarbon matrix of the Mg form.
1
2. Kataliticheskie svoistva veshchestv (Catalytic Proper-
ties of Substances), Roiter, V.A., Ed., Kiev: Naukova
Dumka, 1968.
13. Egiazarov, Yu.G., Savchits, M.F., and Ustilov-
skaya, E.Ya., Geterogenno-kataliticheskaya isomeri-
zatsiya uglevodorodov (Heterogeneous Catalytic
Isomerization of Hydrocarbons), Minsk: Nauka i
Tekhnika, 1989.
(
2) The activity of 2.5Pd/Mg-K-1 in H oxidation
2
is higher than that of 2.5Pd/H-K-1. This is due to
different dispersities and electronic states of reduced
palladium in these matrices.
1
4. Savchits, M.F., Radkevich, V.Z., Ustilovskaya, E.Ya.,
et al., React. Kinet. Catal. Lett., 1994, vol. 52, no. 1,
pp. 43 47.
(
3) The catalytic activity in H oxidation increases
2
after treatment of the samples with the reaction mix-
ture at temperatures from 100 to 180 C. After treat-
ment at higher temperature (180 250 C), the activity
of the catalyst based on the Mg form remains the
same and the activity of the catalysts based on the
H form of the ion exchanger sharply decreases owing
to thermolysis of the support.
1
1
5. Galezot, P., in Proc. 6th Int. Zeolite Conf., Guildorf,
1
984, pp. 352 367.
6. Ione, G.K., Polifunktsional’nyi kataliz na tseolitakh
Polyfunctional Catalysis with Zeolites), Novosibirsk:
(
Nauka, 1982.
1
1
7. Samont, M.G. and Boudart, M., J. Phys. Chem., 1991,
vol. 95, no. 10, pp. 4070 4074.
8. Bredikhin, M.N. and Lochov, Yu.A., J. Catal., 1989,
REFERENCES
vol. 115, no. 2, pp. 601 604.
1
2
. Karpov, O.N., Tulupov, P.E., and Volkov, V.I., Zh.
Fiz. Khim., 1971, vol. 45, no. 7, pp. 1750 1763.
. Uglyanskaya, V.A., Zav’yalova, T.A., Romanen-
ko, E.F., et al., Zh. Fiz. Khim., 1981, vol. 35, no. 11,
pp. 2868 2871.
19. Egiazarov, Yu.G. and Radkevich, V.Z., Kinet. Katal.,
2002, vol. 43, no. 6, pp. 1 6.
20. Radkevich, V.Z., Savchits, M.F., Novgorodov, B.N.,
et al., Zh. Prikl. Khim., 1998, vol. 71, no. 10,
pp. 660 664.
3
. Kurenkov, V.F. and Safin, A.G., Zh. Prikl. Khim.,
21. Radkevich, V.Z., Ivko, A.A., and Egiazarov, Yu.G.,
1
998, vol. 71, no. 11, pp. 1927 1929.
Kinet. Katal., 2001, vol. 42, no. 4, pp. 574 578.
RUSSIAN JOURNAL OF APPLIED CHEMISTRY Vol. 77 No. 9 2004