超临界流体制备纳米催化剂的方法

New Chemical Approaches to the Preparation of Nanometer Catalyst by Supercritical Fluid

超临界流体以其粘度低、密度大、较好的传质、传热和溶解性等特性,故在许多领域都有广阔的应用前景。纳米催化剂相对常规尺寸的催化剂具有更高的表面原子比,更大的比表面积,表面能等优点,故其制备技术已成为化学工程研究的一个新兴领域。本文主要介绍3种新兴的超临界流体化学合成纳米催化剂的方法:超临界水热合成法、超临界水解和超临界渗透吸附法。

Supercritical fluid has some unique characteristics:low viscosity,high density,good per- formance of mass transfer,heat transfer and dissolu- tion,so it had been proved to have great potential in the future development.The nanometer catalyst had some remarkable characters so that its preparation tech- nology has been a rising area in the research of chemi- cal engineering.This paper mainly focuses on three new methods of the preparation of nanometer catalyst by supercritical fluid.They were hydrothermal synthe- sis in supercritical water,supercritical hydrolysis and supercritical impregnation.