Accessibility and Reactivity of Protons in Sodalite Cages of Faujasite Zeolites
- Type: Conference Presentation
- Conference Type: AIChE Annual Meeting
- Presentation Date: November 11, 2021
- Duration: 18 minutes
- Skill Level: Intermediate
- PDHs: 0.50
Faujasite (FAU) zeolites undergo mild dealumination at moderate ion exchange conditions (0.01 to 0.6 M of NH4NO3 solutions) resulting in protons circumscribed by sodalite cages becoming accessible for reaction. Accessibility of protons in the sodalite cages on FAU zeolites can be systematically manipulated by varying ammonium concentrations, and distribution of accessible protons can be quantified based on the band area ratio of ODSOD/ODSUP (OD2820/OD2860) by virtue of infrared spectra for H-D exchange of deuterated propane operated in batch mode. Protons in sodalite cages (HSOD) show higher H-D exchange rates than protons in supercages (HSUP) plausibly due to confinement effects being more prominent in smaller voids. Rate constants of propane dehydrogenation (kD) and cracking (kC) are also augmented as the fraction of accessible protons in the sodalite cages is enhanced, and these data in turn inform that both kD and kC are higher on a per proton basis in sodalite cages than in supercages. These effects of accessibility and reactivity of protons in sodalite cages are revealed herein via methods that systematically increase accessibility of sodalite cages.
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