Additive-free N-methylation of amines with methanol over supported iridium catalyst
| العنوان: | Additive-free N-methylation of amines with methanol over supported iridium catalyst |
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| المؤلفون: | Teck-Peng Loh, Longfei Zhu, Jing Wang, Wenwen Qiang, Sen Ye, Xiang Liu |
| المصدر: | Catalysis Science & Technology. 11:3364-3375 |
| بيانات النشر: | Royal Society of Chemistry (RSC), 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Solvent, chemistry.chemical_compound, chemistry, Inorganic chemistry, chemistry.chemical_element, Reactivity (chemistry), Amine gas treating, Iridium, Methanol, Selectivity, Mesitylene, Catalysis |
| الوصف: | An efficient and versatile zinc oxide-supported iridium (Ir/ZnO) catalyst was developed to catalyze the additive-free N-methylation of amines with methanol. Mechanistic studies suggested that the high catalytic reactivity is rooted in the small sizes (1.4 nm) of Ir nanoparticles and the high ratio (93%) of oxidized iridium species (IrOx, Ir3+ and Ir4+) on the catalyst. Moreover, the delicate cooperation between the IrOx and ZnO support also promoted its high reactivity. The selectivity of this catalytic N-methylation was controllable between dimethylation and monomethylation by carefully tuning the catalyst loading and reaction solvent. Specifically, neat methanol with high catalyst loading (2 mol% Ir) favored the formation of N,N-dimethylated amine, while the mesitylene/methanol mixture with low catalyst loading (0.5 mol% Ir) was prone to producing mono-N-methylated amines. An environmentally benign continuous flow system with a recycled mode was also developed for the efficient production of N-methylated amines. With optimal flow rates and amine concentrations, a variety of N-methylamines were produced with good to excellent yields in this Ir/ZnO-based flow system, providing a starting point for the clean and efficient production of N-methylamines with this cost-effective chemical process. |
| تدمد: | 2044-4761 2044-4753 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::d31eb861bfb5a1a65596743caececfc3Test https://doi.org/10.1039/d0cy02442bTest |
| حقوق: | CLOSED |
| رقم الانضمام: | edsair.doi...........d31eb861bfb5a1a65596743caececfc3 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20444761 20444753 |
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