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Effects of Partial Confinement on the Specificity of Monomolecular Alkane Reactions for Acid Sites in Side Pockets of Mordenite
Author(s) -
Gounder Rajamani,
Iglesia Enrique
Publication year - 2010
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200905869
Subject(s) - isobutane , dehydrogenation , mordenite , alkane , butane , chemistry , catalysis , activation barrier , photochemistry , organic chemistry , zeolite
Catalytic specificity of side pockets : Monomolecular reactions with higher activation energies—dehydrogenation of linear alkanes ( n ‐butane: blue) and cracking of branched alkanes (isobutane: green)—show a stronger preference for acid sites located within eight‐membered ring (8‐MR) side pockets in mordenite, where reactants and transition states can only be partially confined. Partial confinement leads to higher entropies and lower free energies for ion pairs at late monomolecular transition states.