Tungsten-substituted molybdophosphoric acid impregnated with kaolin: effective catalysts for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones via biginelli reaction
作者： Sunil G. Shankarwar , Kiran R. Khillare , Dipak S. Aher , Laxmikant D. Chavan
DOI: 10.1039/D0RA09811F
关键词: Biginelli reaction 、 Infrared 、 Molybdophosphoric acid 、 Thermal analysis 、 Materials science 、 Nuclear chemistry 、 Scanning electron microscope 、 Transmission electron microscopy 、 Tungsten 、 Catalysis
摘要: A series of highly reusable heterogeneous catalysts (10–25 wt% PMo7W5/kaolin), consisting tungsten-substituted molybdophosphoric acid, H3PMo7W5O40·24H2O (PMo7W5) impregnated with acid treated kaolin clay was synthesized by the wetness impregnation method. The newly catalyst fully characterized using inductively coupled plasma-atomic emission spectroscopy (ICP-AES), Fourier transform infrared (FT-IR), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive analysis (EDX), transmission (TEM), Brunauer–Emmett–Teller (BET) and thermal (TG-DTA). materials were shown to be efficient in synthesis 3,4-dihydropyrimidin-2(1H)-ones via Biginelli reaction under solvent-free conditions. obtained results indicate that 20% PMo7W5/kaolin showed remarkably enhanced catalytic activity compared bulk PMo7W5 catalyst, also (10 15%) supported on clay.
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