Open AccessRole of the ionic environment in enhancing the activity of reacting molecules in zeolite pores
Author(s) -
Niklas Pfriem,
Peter H. Hintermeier,
Sebastian Eckstein,
Sung Min Kim,
Qiang Liu,
Hui Shi,
Lara Milaković,
Yuanshuai Liu,
Gary L. Haller,
Eszter Baráth,
Yue Liu,
Johannes A. Lercher
Publication year - 2021
Publication title -
science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 12.556
H-Index - 1186
eISSN - 1095-9203
pISSN - 0036-8075
DOI - 10.1126/science.abh3418
Subject(s) - chemistry , ionic bonding , zeolite , catalysis , hydronium , molecule , inorganic chemistry , ionic strength , reactivity (psychology) , intramolecular force , ion , chemical engineering , photochemistry , organic chemistry , aqueous solution , medicine , alternative medicine , pathology , engineering
Speeding reactions through ionic strength Brønsted acidity is introduced into microporous zeolites through the addition of framework aluminum. Pfriemet al. show that in the presence of water, the limited volume in the microchannels of zeolite H-MFI leads to a high concentration of hydrated hydronium ions at aluminum sites. The resulting high charge density creates a highly non-ideal solvation environment and, for cyclohexanol dehydrogenation, the charged carbenium-ion transition state was stabilized. A higher rate was maintained with lower-acidity sodium ion–exchanged zeolites that had the same high ionic strength.Science , abh3418, this issue p.952
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