酸度对掺杂Ce-SBA-15介孔分子筛合成的影响

Effect of acidity on the synthesis of cerium-incorporated SBA-15 mesoporous molecular sieve

采用溶胶-凝胶法,以三嵌段共聚物(P123)作为模板剂,正硅酸乙酯(TEOS)为硅源,通过微波辅助加热快速合成出骨架掺杂的Ce-SBA-15介孔分子筛。采用X射线粉末衍射(XRD)、傅立叶变换红外(FT-IR)、N2等温吸附-脱附法、紫外-可见漫反射(DRS)等手段对合成的样品进行表征。结果表明,当凝胶的pH=2～7时,所合成的Ce-SBA-15分子筛中,Ce具有两种配位状态。当凝胶体系pH值=2时,所合成的Ce-SBA-15具有更高的比表面积。

Using P123 as a template and TEOS as a silica resource,Ce-silica mesoporous SBA-15-type material was synthesized rapidly via microwave technique and characterized by XRD,FT-IR,low temperature N2 adsorption-desorption and DRS measurements.The results showed that there exist two coordination states of cerium in Ce-SBA-15 which synthesized when the pH value of gel system ranged from 2 to 7.The obtained Ce-SBA-15 possess the highest surface area when the acidity condition was adjusted at pH=2.