CAJ | 학술논문

以丙烯为碳源,在700 ℃～1 200 ℃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 ℃～1 000 ℃的活化能为137±25 kJ/mol,生成乙炔的基元反应控制固相产物的形成.当温度高于1 000 ℃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.
이병희위탄원,재700 ℃～1 200 ℃진행화학기상침적열해탄.채용기상색보화질보련용대반응과정중적기체산물진행정성화반정량분석,채용자현부천평실시칭량반응과정중적고상산물진행동역학연구,재차기출상제출병희분해형성열해탄적궤리.기상산물적분석결과표명:병희열해과정산생30다충방향화합물,수착온도적승고,주요반응생성물유내전변위분;동역학연구결과표명,800 ℃～1 000 ℃적활화능위137±25 kJ/mol,생성을결적기원반응공제고상산물적형성.당온도고우1 000 ℃시,침적행위유기상분자통과변계향고상표면확산화기상성핵공동공제,형성열해탄적주요물질축점유분전변위불포화탄경화합물여을경,을희등.
Gas products and chemical vapor deposition kinetics of pyrocarbon (PyC) formed during pyrolysis of a propylene/argon mixture in the range 700-1200℃ were analyzed by out-line gas chromatography coupled with mass spectrometry and by an in-situ magnetic suspension balance,respectively.More than 30 components were identified.Benzene was the main product,substituting for naphthalene as the temperature increased.PyC was formed with an apparent activation energy of (137±25) kJ/mol,assumed to be controlled by the acetylene-forming reaction from 800℃ to 1000℃.Whereas,above 1000℃,the deposition behavior was representative of a combination between gas phase diffusion from the bulk flow to the solid surface and gas phase nucleation.Reaction models describing homogeneous gas phase PyC deposition reactions were derived.On the basis of these results,a reaction path scheme of PyC formation from propylene was proposed.