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Towards guest-zeolite interactions: an NMR spectroscopic approach
Ding Ma1, Xiuwen Han, Danhong Zhou
1State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences (China). ding.ma@chemistry.oxford.ac.uk
Abstract:
Guest(metal)-zeolite interactions in a two component heterogeneous catalyst have been investigated by high-field and high-speed (27)Al MAS NMR, and two-dimensional (27)Al MQ MAS NMR experiments as well as ab initio DFT methods. It was established that strong interactions between guest and zeolite occur in a metal/zeolite system, with the metal anchored to the tetrahedral aluminum framework site through two oxygen bridges. It disturbs the tetrahedral environment of associated aluminum framework, changing AlO(4) geometry from near T(d) to C(2v); this enables us to resolve this species from the undisturbed aluminum framework species in high-field (27)Al MAS NMR and two-dimesional (27)Al MQ MAS NMR experiments.