ABSTRACT

Potassium carbonate was employed as an effective catalyst to explore the catalytic pyrolysis characteristics of Shenfu bituminous coal (SF). The online investigation on the effects of catalyst loading amounts (2.2–6.6%) and pyrolysis temperature (650–800°C) on the gas release characteristics of SF pyrolysis were conducted using Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis-mass spectrometry (TG-MS). The results show that the K₂CO₃ loading could increase the yields of pyrolysis gaseous products and reduce the peak temperature for gaseous product releasing. Peak temperatures for CO₂, H₂O, and CH₄ releasing hardly changed with the pyrolysis temperature, but changed for different K₂CO₃ loading amounts. Peak temperatures for CH₄, CO₂, and H₂ releasing decreased as catalyst loading increased while the peak temperatures for H₂O releasing were almost independent as ~470°C. The increase of the K₂CO₃ loading amount and pyrolysis temperature could increase the yields of CO₂ and H₂, but had no significant effect on the CH₄ yield. The release mechanism of pyrolysis gaseous products could be well verified by the variation in type and intensity of chemical functional groups from the coal samples versus pyrolysis temperature and K₂CO₃ loading.

摘要

以碳酸钾为有效催化剂，探讨了神甫烟煤的催化热解特性。使用傅里叶变换红外光谱（FTIR）和热重分析-质谱法对催化剂负载量（2.2–6.6％）和热解温度（650–800°C）对SF热解气体释放特性的影响进行在线研究（TG-MS）。结果表明，负载K ₂ CO ₃可以提高热解气态产物的产率，降低气态产物释放的峰值温度。CO ₂，H ₂ O和CH _4的峰值温度释放几乎不随热解温度变化，而是随着不同的K ₂ CO ₃负载量而变化。CH ₄，CO ₂和H ₂释放的峰值温度随着催化剂载量的增加而降低，而H ₂ O释放的峰值温度几乎独立于〜470°C。K ₂ CO ₃负载量和热解温度的增加可以增加CO ₂和H ₂的产率，但对CH _4的影响不明显。让。热解气态产物的释放机理可以通过煤样品中化学官能团的类型和强度随热解温度和K ₂ CO ₃负载的变化而得到很好的验证。