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RSC Advances
of n-butylamine with methanol in xed bed reactor and results
shown that the compound catalyst shows best performance
when the mass fraction of alumina is 40%. It was found that the
catalyst has good activity and selectivity for the N-methylation of
aliphatic amines, but not for aromatic amines. For the aliphatic
7 H. G. Chen, T. Zhang, M. Luo, C. Qiao, J. Q. Liu, X. Han and
X. Z. Chen, J. Chem. Eng. Chin. Univ., 2009, 23, 801–806.
8 Q. X. Li, G. Y. Zhang and S. Y. Peng, Chin. J. Catal., 2001, 22,
7–10.
9 X. M. Liu, Fine Chemicals, 2002, 19, 315–317.
amines, the selectivity of second amines are better than primary 10 X. Y. Mao and X. Z. Chen, J. Zhejiang Univ., Sci., B, 2003, 37,
amines because primary amine are prone to single methylation 307–309.
reaction to give N-methyl products. The low conversion of dii- 11 J. M. Huang, C. Qian, F. Lie, Y. B. Chen and X. Z. Chen,
sopropylamine indicated that the steric effect of amine also has Monatsh. Chem., 2013, 144, 1187–1190.
a great inuence for the N-methylation reaction over the 12 J. M. Huang, L. F. Xu, C. Qian and X. Z. Chen, Chem. Pap.,
compound catalyst. Besides, the test of the catalyst's stability 2012, 66, 304–307.
was performed and the result demonstrated that the catalyst 13 X. Zhang, T. Zhang, X. X. Chen, H. Yan, M. Luo, C. Qian and
has constant stability and long lifetime. At last, the methanol X. Z. Chen, J. Zhejiang Univ., Sci., B, 2009, 43, 1684–1686.
adsorption was investigated by in situ FTIR in order to study the 14 X. Ge, J. B. Pan, C. Qian, L. Feng, Y. B. Chen and X. Z. Chen,
mechanism of dehydration reaction on the combined Al Catal. Commun., 2014, 46, 201–207.
mordenite catalyst, and the methoxyl species which is the active 15 X. Y. Hou, J. L. Qin and G. S. Zhou, China Surfactant Deterg.
2 3
O –
species of the N-methylation of amines was found.
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Acknowledgements
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The authors are grateful for the nancial support from the 18 F. Valot, F. Fache, R. Jacquot, M. Spagnol and M. Lemaire,
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