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采用甲烷、正丁烷、乙炔3种烃类气体作为碳源,纳米金属镍为催化剂,在活性炭(AC)上生长了纳米碳纤维(CNF)。通过氮气等温吸附、粉末比电阻、扫描电镜(SEM)和X光衍射(XRD)等一系列表征手段,比较了3种碳源对获得的CNF/AC复合材料的比表面积、导电性,以及其中的CNF形貌的影响。结果表明,在相同生长条件下,碳沉积速度与碳源气的碳氢比成正相关,与产物的比表面积成负相关。提出碳源气在化学气相沉积(CVD)过程对产物性能影响的机理,提出依据分子中碳气原子比选择烃类碳源气,从而提高CVD过程催化分解反应选择性的方法。
Three kinds of hydrocarbon gases, methane, n-butane and acetylene, were used as carbon source and nano-nickel as catalyst to grow carbon nanofibers (CNF) on activated carbon (AC). The specific surface area, electrical conductivity of the obtained CNF / AC composites were compared by means of a series of characterization methods such as isothermal adsorption of nitrogen, powder resistivity, scanning electron microscopy (SEM) and X-ray diffraction (XRD) Of the CNF morphology. The results show that under the same growth conditions, the carbon deposition rate has a positive correlation with the carbon source gas carbon ratio, and has a negative correlation with the specific surface area of the product. The mechanism of the effect of carbon source gas on the product performance by chemical vapor deposition (CVD) process is proposed. A method for selecting the hydrocarbon source gas based on the atomic ratio of carbon atoms in the molecule is proposed to improve the selectivity of the catalytic decomposition reaction in the CVD process.