Related Products of 676-96-0. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: Trimethylphosphineoxide, is researched, Molecular C3H9OP, CAS is 676-96-0, about The acidic nature of “”NMR-invisible”” tri-coordinated framework aluminum species in zeolites. Author is Xin, Shaohui; Wang, Qiang; Xu, Jun; Chu, Yueying; Wang, Pengfei; Feng, Ningdong; Qi, Guodong; Trebosc, Julien; Lafon, Olivier; Fan, Weibin; Deng, Feng.
The unambiguous characterization of different acid sites in zeolites is of great importance for understanding their catalytic performance and the rational design of highly efficient zeolite catalysts. In addition to various well-characterized extra-framework Al species, a tri-coordinated framework aluminum species can also serve as a Lewis acid site in zeolites, which is “”NMR-invisible”” owing to its extremely distorted local environment. Here we provide a feasible and reliable approach to elucidate the acidic nature of the tri-coordinated framework Al in dehydrated H-ZSM-5 zeolites via sensitivity-enhanced two-dimensional (2D) multiple nuclear correlation NMR experiments coupled with trimethylphosphine oxide (TMPO) probe mols. Two types of tri-coordinated framework Al sites have been unambiguously identified, which amount to 11.6% of the total Bronsted and Lewis acid sites. Furthermore, it was found that synergistic effects arising from the close spatial proximity between the tri-coordinated framework Al site and the Bronsted acid site lead to the generation of superacidity (with an acid strength stronger than 100% H2SO4) in the zeolite.
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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem