介孔二氧化锆分子筛比表面和孔结构的调变

Surface and Pore Structure Modification of Mesoporous Nano-Zirconia Zeolites

在非离子表面活性剂PEO作用下,用固态反应结构导向法合成了介孔二氧化锆。根据Zr-O-Zr骨架结构与有机物种键合较弱的特点,使用了溶剂抽提法脱除结构导向剂。结果发现该法所得介孔材料与焙烧法所得结构显著不同,溶剂抽提法所得材料具有丰富的介孔结构,且比表面较高;而焙烧法所得样品为超微孔结构,热稳定性较高,SEM结果表明在较高的焙烧温度下其有序的表观形貌依然存在。

Mesoporous nano-zirconia zeolite was synthesized by solid-state reaction-surfactant templating coupling method. Herein, solvent extraction could be used to take out the structure templates from zeolite pores because the interaction between skeletal Zr-O-Zr structure and PEO surfactants is very weak. Results indicated that nano-zirconia samples synthesized with solvent extraction borne even developed mesoporous structure and higher surface area but samples produced by calcination had micropore structure and higher thermal stabilities. SEM showed that the ordered apparent structure of the nano-zirconia samples could be stable even calcined at higher temperatures. It can be concluded that surface area and mesopore structures of nano-zirconia zeolites might be effectively modified by different template-extraction.