活性炭上化学气相沉积法生长纳米碳纤维

Growth of Carbon Nanofibers on Activated Carbon by Thermal CVD Method

利用流化床技术,以天然气为碳源,负载于活性炭上的纳米镍粒子为催化剂,在750℃下采用化学气相沉积法制备了气相生长纳米碳纤维(VGCNFs)/活性炭(AC)复合物。通过对样品进行XRD、激光拉曼光谱、扫描电镜和氮吸附检测,发现VGCNFs生长在活性炭的各个侧面上,以顶部生长模式为主,纤维的直径在40～120nm之间,由于粗糙的纤维表面和石墨片层的翘曲而缺陷较多。VGCNFs/AC复合物与原料活性炭相比,BET比表面积从2367m2.g-1降到了1474m2.g-1。实验结果表明,以溶胶凝胶法负载催化剂,利用化学气相沉积法在流化床上可以制备具有大比表面积和高性能的VGCNFs/AC复合物。

Vapor-grown carbon nanofibers（VGCNFs） with a diameter between 40 and 120 nm were synthesised at 1023K by thermal chemical vapor deposition （CVD） method, using nature gas as carbon resources, and niekle nanoparticle supported on activated carbon（AC） as catalyst. The morphology and structure of the samples grown were characterized by Raman and X-ray diffraction technology （XRD）, nitrogen adsorption isotherms, TEM and SEM analysis. It was found that VGCNF, which had many defect because of the rough surface and the contorted graphite layers in fiber, could grow on the every side of AC. Comparing with the raw material AC＇s BET surface area of 2 367 m2·g-1, the BET surface area of CNFs/AC fell to 1 474 m2·g-1. The results indicated that CNFs/AC composite with high BET surface area could be produced in a fluidized bed reactor through loading the catalyst on AC by sol-gel method.