Direct structural identification of carbenium ions and investigation of host-guest interaction in the methanol to olefins reaction obtained by multinuclear NMR correlations.
Direct structural identification of carbenium ions and investigation of host-guest interaction in the methanol to olefins reaction obtained by multinuclear NMR correlations.
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DOI:
10.1039/c7sc03657d
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发表时间:
2017-12-01
期刊:
影响因子:
8.4
通讯作者:
Blanc F
中科院分区:
文献类型:
--
作者:
Xiao D;Xu S;Han X;Bao X;Liu Z;Blanc F
Structural identification of carbenium ion intermediates and quantitative investigation of their interactions with zeolite H-ZSM-5 by multinuclear MAS NMR. Probing and determining the intermediates formed during catalytic reactions in heterogeneous catalysis are strong challenges. Using 13C labelling and two dimensional 13C–13C through-bond NMR correlations, we directly reveal the structures of a range of carbenium ion species formed during the conversion of methanol to olefins on acidic H-ZSM-5 zeolite by mapping the carbon–carbon bond connectivities. Additionally, we use 13C–27Al and 29Si–13C through-space NMR experiments to probe the interactions between the confined carbon species (including carbenium ions) and the framework of the zeolite, which quantitatively provide an estimate for the carbon–aluminium and carbon–silicon distances, respectively.
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