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Oxidative Dehydrogenation of 1‐Butene Over Magnetite
Author(s) -
Liaw BiingJye,
Cheng DongShinh,
Yang ShengJier,
Yang Barry LeeMean
Publication year - 1990
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199000064
Subject(s) - dehydrogenation , chemistry , magnetite , selectivity , spinel , oxide , butene , desorption , inorganic chemistry , iron oxide , catalysis , adsorption , metallurgy , organic chemistry , materials science , ethylene
Magnetite (FC 3 O 4 ), a partially reduced iron oxide, has long been considered as inactive in the oxidative dehydrogenation of butene. By studying a clean Fe 3 O 4 powder, we found that Fe 3 O 4 , similar to other spinel ferrites, is not only active, but also more active and selective than α‐Fe 2 O 3 . The active site densities and the desorption temperatures of oxidation products on Fe 3 O 4 were also measured. Fe 3 O 4 is, however, unstable under flow reaction conditions. Even if the bulk of the oxide is stabilized in the form of Fe 3 O 4 at high temperatures and low O 2 /C 4 ratios, its surface is gradually oxidized to a form close to α‐Fe 2 O 3 , resulting in a decrease in both the activity and selectivity. The restructuring of the FC 3 O 4 surface is temperature dependent. At 300°C, the high selectivity and activity of a low‐surface‐area Fe 3 O 4 can be long preserved even if the bulk is oxidized to α‐Fe 2 O 3 .