以中间相沥青为碳质前躯体,采用自发泡法制得泡沫炭.为了提高比表面积,泡沫炭经质量分数65％的HNO3氧化后,采用化学气相沉积法在其表面生长一层纳米炭纤维(CNFs).泡沫炭表面生长一层CNFs后,其比表面积和导热系数分别由40m2/g、107W/mK相应提高到198 m2/g、125W/mK.这种结构的CNFs/泡沫炭复合材料可以用作气相催化反应体系的催化剂载体.
A carbon foam was prepared by self-bubbling using mesophase pitch as a precursor.To improve its specific surface area,the carbon foam was oxidized with 65 mass％ HNO3,and then a layer of carbon nanofibers(CNFs)was grown on the pore walls using chemical vapor deposition.The specific surface area and thermal conductivity of the carbon foam and CNF/carbon foam composite are 40 and 198m2/g and 107 and 125W/mK,respectively.This CNF/carbon-foam composite can be used as a catalyst support for gas-phase catalytic reactions.
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