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Reductive Amination of Triacetoneamine with n-Butylamine Over Cu–Cr–La/γ-Al2O3

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Abstract

A series of Cu-based catalysts were prepared and examined for the reductive amination of triacetoneamine with n-butylamine, thereinto, Cu–Cr–La/γ-Al2O3 showed excellent results. The catalysts were studied by XRD, XPS, H2-TPR and NH3-TPD. It was found that doped Cr remarkably enhanced the activity of Cu/γ-Al2O3 due to better dispersion of Cu0, which is believed to be the active site for the reductive amination. Additionally, it was obvious that introduction of La to Cu–Cr/γ-Al2O3 led to a higher selectivity and longer lifetime. The reaction parameters were optimized and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine was obtained in a yield of 94%.

Graphical Abstract

The addition of Cr does not impact obviously on the total acidity of Cu20/γ-Al2O3. However, the La addition to Cu20Cr5/γ-Al2O3 not only decreases the total acidity but also reduces the strength of acid sites. The introduction of La was found to result in a higher selectivity and longer lifetime. The conversion of TAA and selectivity of TEMPBA remained around 99.7 and 94.5% in 120 h.

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Acknowledgment

The authors would like to express their thanks for the financial support provided by the National Natural Science Foundation of China (Grant No. 20976123).

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Authors and Affiliations

  1. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People’s Republic of China

    Meng Sun, Xiaobao Du, Huabang Wang, Zhiwei Wu, Yang Li & Ligong Chen

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  1. Meng Sun
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  2. Xiaobao Du
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  3. Huabang Wang
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  4. Zhiwei Wu
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  5. Yang Li
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  6. Ligong Chen
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Correspondence to Ligong Chen.

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Sun, M., Du, X., Wang, H. et al. Reductive Amination of Triacetoneamine with n-Butylamine Over Cu–Cr–La/γ-Al2O3 . Catal Lett 141, 1703–1708 (2011). https://doi.org/10.1007/s10562-011-0699-7

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