Publication - Journal Article Role of the ionic environment in enhancing the activity of reacting molecules in zeolite pores

Science, vol. 372, iss. 6545, pp. 952-957, 2021

Niklas Pfriem, Peter H. Hintermeier, Sebastian Eckstein, Sungmin Kim, Qiang Liu, Hui Shi, Lara Milakovic, Yuanshuai Liu, Gary L. Haller, Eszter Baráth, Yue Liu, Johannes A. Lercher

Speeding reactions through ionic strength Brønsted acidity is introduced into microporous zeolites through the addition of framework aluminum. Pfriem et 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