Preparation and characterization of nano-CaO based on eggshell waste：Novel and green cat

Preparation and characterization of nano-CaO based on eggshell waste：Novel and green catalytic approach to highly efficient synthesis of

pyrano[4,3-b]pyrans

Elaheh Mosaddegh;Asadollah Hassankhani

【期刊名称】《催化学报》 【年(卷),期】2014(000)003

【摘要】Nano-CaO was prepared by calcination of ball-milled chicken eggshell waste. This novel, bioactive, heterogeneous catalyst, which had high catalytic activity and reusability, was used in the green synthesis of pyrano[4,3-b]pyrans via condensation of various aromatic aldehydes, malononitrile, and 4-hydroxy-6-methyl-2H-pyran-2-one at 120 °C under solvent-free conditions. The reaction proceeded to completion within 5-45 min in 93%-98% yield. The nano-CaO was fully characterized by scanning electron microscopy, X-ray powder diffraction, infrared spectroscopy,

X-ray

fluores-cence

spectroscopy,

and

thermal

gravimetric, surface area, and elemental analyses. 【总页数】6页(351-356) 【关键词】

【作者】Elaheh Mosaddegh;Asadollah Hassankhani

【作者单位】Department of New Materials, Institute of Science and High Technology and Environmental Sciences, Graduate University of