IR spectroscopic study of hydroxyl groups of molecular sieves in the fundamental and combination tone regions

Abstract The fundamental and combination vibrations of hydroxyl groups in zeolites (Y, ZSM-5) and silicoaluminophosphates (SAPO-5, -17, -34) are investigated. The influence of adsorbed molecules (C 6 F 6 , n-hexane) on the combination vibrations is also studied. Finally, remarks on quantitative evaluation of DRIFT spectra of NaHZSM-5 containing different amounts of bridging OH groups are given.