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以Fe质量分数分别为0.3%、1.6%、3.3%和5.2%的氯化钠担载铁为催化剂,化学气相沉积法催化裂解乙炔400℃下进行反应,系统探讨了碳包覆金属纳米颗粒的可控制备。通过扫描电子显微镜和高分辨透射电子显微镜对产物进行了表征,结果表明,w(Fe)=0.3%的催化剂制备的样品粒径在20～50 nm,平均直径约为30 nm;w(Fe)=1.6%的催化剂制备的样品粒径在35～60 nm,平均直径约为49 nm;而w(Fe)=3.3%和5.2%的催化剂制备的样品粒径差别不大,在40～100 nm,平均粒径约为65 nm。所制备的碳包覆金属纳米颗粒具有清晰的同心石墨壳层结构,并存在一定的结构缺陷。
The reaction of acetylene catalyzed by chemical vapor deposition at 400 ℃ was carried out by using iron (III) supported on sodium chloride with 0.3%, 1.6%, 3.3% and 5.2% Fe as catalyst. The effects of carbon-coated metal nanoparticles Controllable preparation. The samples were characterized by scanning electron microscopy (SEM) and high resolution transmission electron microscopy (TEM). The results showed that the particle size of samples prepared with w (Fe) = 0.3% was 20-50 nm and the average diameter was about 30 nm. = 1.6%, the diameter of the prepared sample is 35-60 nm and the average diameter is about 49 nm. The particle sizes of samples prepared with w (Fe) = 3.3% and 5.2% , The average particle size is about 65 nm. The prepared carbon-coated metal nanoparticles have a clear concentric graphite shell structure with some structural defects.