摘要
采用TG/FTIR/MS三联机在线检测CaC_2O_4分解过程中逸出气的红外和质谱信息,并改变试样量及气氛气体的氧浓度进行定性定量分析。发现在惰性气氛下CaC_2O_4的两个分解过程中均存在CO和CO_2共逸出现象。其中与CO共逸出的CO_2,由CO的歧化反应和氧化反应共同贡献;与CO_2共逸出的CO,则是由歧化反应产物C与逸出气CO_2发生碳气化反应而生成。系统内氧气浓度对CO歧化反应和碳气化反应有很大影响,当氧气体积浓度达到38×10-6时,已检测不到这两个反应的存在,此时质谱中O_2(质荷比32)的离子流曲线出现负峰。
The decomposition of CaC2O4 was investigated by means of thermogravimetry/Fourier transform infrared spectrometry/mass spectrometry （TG/FTIR/MS）. The evolved gas was studied qualitatively and quantitatively by changing the sample weight and the oxygen content of atmosphere. The co-evolution of CO and CO2 was observed during both decomposition processes of CaC2 04 under inert atmosphere. The CO2 gas co-evolved with CO derives from the disproportion and oxidation of CO, while the CO gas coevolved with CO2 from the gasification of carbon, produced by the disproportion of CO, with CO2. Both disproportion and gasification are remarkably influenced by the content of the residue oxygen in the system. These two reactions cannot be detected when the concentration of oxygen is above 38 × 10^-6 and a negative peak on MS signal with m/z 32 appears.
出处
《分析仪器》
CAS
2017年第6期108-116,共9页
Analytical Instrumentation
