以丙烯为碳源,在700℃～1200℃进行化学气相沉积热解炭。采用气相色谱和质谱联用对反应过程中的气体产物进行定性和半定量分析,采用磁悬浮天平实时称量反应过程中的固相产物进行动力学研究,在此基础上提出丙烯分解形成热解炭的机理。气相产物的分析结果表明:丙烯热解过程产生30多种芳香化合物,随着温度的升高,主要反应生成物由萘转变为苯;动力学研究结果表明,800℃～1000℃的活化能为137±25kJ/mol,生成乙炔的基元反应控制固相产物的形成。当温度高于1000℃时,沉积行为由气相分子通过边界向固相表面扩散和气相成核共同控制,形成热解炭的主要物质逐渐由苯转变为不饱和碳氢化合物如乙烃,乙烯等。 Using propylene as carbon source, chemical vapor deposition pyrolytic carbon was carried out at 700 ℃ ~ 1200 ℃. Gas chromatography-mass spectrometry (GC-MS) was used to qualitatively and semi-quantitatively analyze the gas products in the reaction process. The solid-phase products in the reaction process were weighed by using the magnetic levitation balance to conduct the kinetics study. On this basis, the pyrolysis of propylene The mechanism. The analysis of gas phase products showed that more than 30 kinds of aromatic compounds were produced during the pyrolysis of propylene, and the main reaction products turned from naphthalene to benzene with the increase of temperature. The kinetic study showed that the activation energy of 800 ℃ ~ 1000 ℃ 137 ± 25kJ / mol, the elementary reaction to acetylene controls the formation of solid phase product. When the temperature is higher than 1000 ℃, the deposition behavior is controlled by the diffusion of gas molecules to the solid surface through the boundary and controlled by the gas phase nucleation. The main material forming pyrolysis carbon gradually changes from benzene to unsaturated hydrocarbons such as ethylene, ethylene and the like .