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- W1536693421 abstract "In situ 13 C MAS NMR was applied to study the mechanisms of the N-alkylation of aniline and of the O-alkylation of phenol with methanol on acidic (H-Y) and basic (CsOH/CsNa-Y) zeolite Y catalysts. Methanol- 13 C was the labeled reactant. The results point to similar mechanisms of the N- and O-alkylation on Brønsted acid sites including a dehydration of methanol towards dimethyl ether (DME) or surface methoxy groups, which further react with aniline to N-methyalnilinium, N,N-dimethylanilinium, and N,N, N-trimethylanilinium cations or a direct reaction of phenol and methanol towards anisole. At variance, different mechanistic pathways were observed on basic zeolite Y: N-alkylation is shown to proceed via methanol dehydrogenation leading to the formation of formaldehyde species responsible for further methylation, while O-alkylation includes the formation of phenolate ions initiating the alkylation reaction." @default.
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- W1536693421 date "2004-01-01" @default.
- W1536693421 modified "2023-09-26" @default.
- W1536693421 title "AN in situ13C MAS NMR study of the zeolite-catalyzed alkylation of polar aromatics" @default.
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- W1536693421 doi "https://doi.org/10.1016/s0167-2991(04)80479-8" @default.
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