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have been structurally characterized by in situ IR, EXAFS,
di†use reÑectance spectroscopies and NO chemisorption.
EXAFS coordination numbers showed that the successively
decarbonylated sample maintained its small cluster size, which
depended on the temperature-programmed oxidation of the
precursor.
19 N. Kosugi and H. Kuroda, Program EXAFS 2, Research Center
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20 Y-C. Xie and Y-Q. Tang, Adv. Catal., 1990, 37, 1.
21 S. Qui, R. Ohnishi and M. Ichicawa, J. Chem. Soc., Chem.
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Methane was converted to heavier hydrocarbons by its che-
misorption on supported cobalt catalysts and subsequent
hydrogenation. NaY-encapsulated Co clusters showed
a
higher activity and selectivity of C hydrocarbons, in com-
2`
parison with a Co/SiO catalyst. The IR and mass spectra and
22 F. A. Cotton and R. R. Monchamp, J. Chem. Soc., 1960, 1882.
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2
the reaction studies proved that CH (x \ 0, 1, 2) adspecies
x
were generated by methane thermal dissociation on the
[Co ] /NaY catalyst. The CH fragment is quite reactive
x red
2
24 Y. Iwasawa, M. Yamada, Y. Sato and H. Kuroda, J. Mol. Catal.,
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enabling propagation of higher hydrocarbons.
25 R. A. Friedel, I. Wender, S. L. ShuÑer and H. W. Sternberg, J.
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Paper 6/05124C; Received 23rd July, 1996
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