J. Cejka et al., Extent of monomolecular and bimolecular mechanism in n-butene skeletal isomerization to isobutene over molecular sieves, APP CATAL A, 179(1-2), 1999, pp. 217-222
Mechanism of skeletal isomerization of n-butene to isobutene over CoAlPO-11
and H-ferrierite molecular sieves was investigated using C-13 labeled 1-bu
tene. It was confirmed that a high selectivity to isobutene can be reached
exclusively via a monomolecular reaction pathway. The bimolecular mechanism
is responsible not only for the formation of propylene, pentenes, and othe
r by-products but also for a substantial amount of isobutene. At least 30%
of isobutene formed over ferrierite at 620 K was produced via dimerization
of butenes followed by isomerization and cracking. (C) 1999 Elsevier Scienc
e B.V. All rights reserved.