Solid-state NMR characterization of the acid sites in cubic mesoporous Al-MCM-48 materials using trimethylphosphine oxide as a 31P NMR probe

Detection of the inhomogeneity of Brønst

Detection of the inhomogeneity of Brønsted acidity in H-mordenite and H-β zeolites: a comparative NMR study using trimethylphosphine and trimethylphosphine oxide as 31P NMR probes

✍ Hsien-Ming Kao; Chun-Yu Yu; Ming-Chu Yeh 📂 Article 📅 2002 🏛 Elsevier Science 🌐 English ⚖ 161 KB

The Brønsted acidity of H-mordenite (H-MOR) and H-b with similar Si/Al ratios has been characterized by conventional multinuclear solid-state NMR. 1 H/ 27 Al TRAPDOR NMR showed the presence of at least two different types of Brønsted acid sites in H-b. On the other hand, only a single 1 H resonance