用作气相催化反应体系CNF/泡沫炭催化剂载体的合成

Synthesis of carbon nanofiber/carbon-foam composite for catalyst support in gas-phase catalytic reactions

摘要: 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198m²/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。

Abstract: 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.