Abstract
High-surface-area ZrO2/γ-Al2O3 catalysts were used for the selective N-methylation of aniline with methanol at mild temperature and atmospheric pressure conditions. The activity and stability of these catalysts were maintained throughout the process without significant changes in conversion and selectivity of the target products. These γ-Al2O3-supported ZrO2 catalysts were synthesized by a facile wet impregnation method, and their zirconia loadings varied from 10 to 50%. In order to enhance the catalytic activity, changes were implemented on the zirconia loadings under varying reaction parameters. N-methyl aniline can be produced preferentially at 270 °C with a catalyst composed of 20 wt % ZrO2/γ-Al2O3. This catalyst was able to acquire a higher aniline conversion during methylation because of its enough surface area and the presence of weak and moderate Lewis acidic sites in its γ-Al2O3 and ZrO2 components. The catalytic activity and product distribution were also assessed by adjusting a variety of reaction parameters, like temperature, ratios, and catalyst loadings, respectively. The structural and textural properties of synthesized catalysts are thoroughly characterized using a number of different analytical techniques. Thus, the current protocol can be considered as a simpler, reproducible, and environmentally benign approach for N-methylation of amines.
Graphical Abstract
Zirconia/γ-alumina for N-methylation of aniline in vapor-phase continuous mode
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The authors would like to thank Universiti Malaysia Pahang Al-Sultan Abdullah.
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This study is supported by the UMPSA, MALAYSIA.
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Madduluri, V.R., Rahim, M.H.A. Highly Effective Zirconia/γ-Alumina for Continuous Vapor Phase N-methylation of Aniline. Catal Lett 154, 3457–3471 (2024). https://doi.org/10.1007/s10562-023-04568-9
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DOI: https://doi.org/10.1007/s10562-023-04568-9