活化硅胶表面Fe^(3+)的担载及其对甲醛的催化氧化

Supporting of Fe^(3+) on Surface of Activated Silica Gel and Its Catalytic Oxidation Performance to Formaldehyde

硅胶颗粒经过400℃高温活化后与四氯化硅在无水四氢呋喃溶剂中反应制得氯化硅胶。氯化硅胶再经乙酰胺修饰,制备得到表面含羰基和氨基的硅胶修饰体。此组装体具有良好的配位能力,能够与Fe3+进行配位,从而得到表面催化活性点均匀分布的负载型催化剂。该催化剂对甲醛催化氧化具有良好的催化性能,最高催化效率高达91.3%。

After heated at 400 ℃, the activated silica gel reacted with silicon tetrachloride to obtain chlorinated silica gel in anhydrous tetrahydrofuran. And a modified silica gel with carbonyl and amino groups on its surface was obtained by the reaction between chlorinated silica gel and acetamide. The modification has good coordination ability to Fe3＋, and a supported catalyst with catalytic active site of Fe3＋evenly distributed was then prepared by coordination between Fe3＋and the surface organic modified silica gel. The synthesized catalyst has good catalytic oxidation performance to formaldehyde, and a maximum conversion of formaldehyde is about 91.3%.