Abstract

Effect of Surface Properties of Supported Pt-Based Catalysts on the Hydrogenation of N-(2`,3`-dimethoxybenzyl)-3,4-Dioxy-Methylene- Phenylethylamine

Pt/ Al2O3, Pt/Al2O3-xMgO and Pt/MgO catalysts were studied for hydrogenation of N-(2`,3`-dimethoxy benzyl)- 3,4-dioxy-methylene-phenylethylamine, the N2 physi-sorption, X-ray Diffraction (XRD), Carbon Dioxide Temperature Programmed Desorption (CO2-TPD), Transmission Electron Microscopy (TEM), Temperature Programmed Reduction of Hydrogen (H2-TPR), and X-ray Photoelectron Spectrometer (XPS) were used to study the physical properties of the catalysts, the surface acidity or basicity of the support, the interaction of active particles with support, the reducibility, dispersion, and active surface area of Pt for the Pt/ Al2O3, Pt/ Al2O3-xMgO and Pt/MgO catalysts. It was founded that the basic support (MgO) caused the electron deficient surface metallic Pt that favored the hydrogenation of N-(2`,3`-dimethoxy benzyl)-3,4-dioxy-methylene-phenylethylamine, and the mesoporosity of MgO support was benefit for the transport of large molecules reactants and products. The utilization of meso-porous Pt/MgO for catalytic hydrogenation of N-(2`,3`-dimethoxy benzyl)-3,4-dioxy-methylene-phenylethylamine (Shiff’s base) with the highest conversion of 96.74%, the highest selectivity of 95.25% and yields of 92.14% implied that the instead of Raney Ni was feasible.


Author(s): Guosheng Wang, Tiantian zhang, Henan Yang, Xiaoguang San, Yingpeng Xie

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