含氮中孔碳材料的制备及其双氧水分解活性

以三聚氰胺和甲醛作为碳源和氮源,合成三聚氰胺甲醛树脂前驱体(2);采用模板法,以CaCl_2为模板剂,2经高温碳化处理制备孔结构发达的含氮中孔碳材料(NMC),其结构经N_2吸附/脱附、扫描电镜(SEM),X-射线衍射(XRD)和X-射线光电子能谱(XPS)表征。不同炭化温度(700℃,800℃,900℃)下所合成的NMC表面氮含量为3.85~10.80at%,比表面积为570~870m~2·g~(-1),中孔孔径为4nm和10nm。以H_2O_2分解反应作为探针反应,考察了NMC的催化活性。结果表明:NMC的催化活性随着碳化温度的升高而增大,碳化温度为900℃的NMC分解H_2O_2的升温速率为6.92℃·min~(-1),循环套用5次后,活性基本维持不变。

Preparation of Nitrogen-Containing Mesoporous Carbon and Its Activity of Hydrogen Peroxide Decomposition

Melamine formaldehyde resin precursors(2) was synthesized from melamine formaldehyde as carbon and nitrogen sources.The nitrogen-containing mesoporous carbon(NMC) was prepared by high temperature carbonization of 2 using CaCl2 as template.The structures were characterized by N2 adsorption/desorption, SEM, XRD and XPS.The NMCs prepared under carbonization temperatures(700 ℃, 800 ℃ and 900 ℃) exhibit 3.85~10.80 at% of surface nitrogen, 570~870 m2·g-1 of specific surface area and 4 nm and 10 nm of mesoporous size.The catalytic activity of NMC was tested by decomposition of H2O2, and the results show that the activity increases with increasing of carbonization temperature.The heating rate of decomposition of H2O2 by NMC prepared under 900 ℃ was 6.92 ℃·min-1, and remains stable after cycle of five times.