Preparation of high surface area, graphitic porous carbon monolith
using magnetite nanoparticles as catalyst and porogens
-
摘要: 报道了一种以Fe3O4纳米晶粒为催化剂和致孔剂制备具有高比表面积块体石墨化炭的方法。首先采用共沉淀法合成粒径<10nm的Fe3O4纳米颗粒,然后将其均匀分散到以2,4-二羟基苯甲酸(D)、甲醛(F)为原料,无水Na2CO3为催化剂形成的聚合物(DF)中,通过溶胶-凝胶过程和炭化过程得到掺杂Fe的石墨化炭。最后经过酸洗,得到纯的高比表面积块体石墨化炭。随炭化温度的升高(700℃~900℃),样品的石墨化程度增加。在800℃炭化,样品已具有明显的石墨化结构,且比表面积较大。Abstract: A method to prepare monolithic porous graphitic carbon with high surface area was investigated using nanosize monodispersed magnetite particles (~10nm) as graphitization catalysts and a porogen template, and an oligomer derived from the polymerization of 2,4-dihydroxybenzoic acid with formaldehyde catalyzed by sodium carbonate as carbon source. The magnetite/oligomer composites were carbonized at 700-900℃ under a nitrogen atmosphere to generate graphitized carbon composites. Finally, monolithic porous graphitic carbon was obtained after HCl treatment to remove the iron-based particles. Results show that carbonization temperature has a great influence on the graphitization degree and the Brunauer-Emmett-Teller (BET) surface area of the resultant products. The BET surface areas decreased and the graphitization degree of the products increased with carbonization temperature from 700 to 900℃. At a low carbonization temperature of 700℃, the templating effect of the magnetite particles (as porogens) can be clearly observed. Highly graphitic carbon with a high surface area can be obtained at 800℃.
-
Key words:
- Catalysts /
- Porogens /
- Monolithic graphitic carbon
点击查看大图
计量
- 文章访问数: 1859
- HTML全文浏览量: 89
- PDF下载量: 1193
- 被引次数: 0