Fe/CaO催化剂对脱灰徐州烟煤热解特性的影响

煤热解是一种重要的煤炭分质利用技术，但热解过程中产生的副产物焦油危害极大，催化改质是高效清洁利用煤焦油的方法之一。本文采用溶胶凝胶法制备Fe/CaO催化剂，在管式炉反应器上对脱灰徐州烟煤进行了催化热解实验，对研究催化裂解煤焦油具有重要的意义。结果表明：Fe/CaO催化剂可以明显促进热解气的产生，热解气中CO₂、CO和CH₄的产量均不断增加。Fe/CaO催化剂促进了液体产物的催化裂解，导致液体产率明显下降。Fe/CaO催化剂促进焦油中的稠环芳烃向脂肪烃和轻质芳烃转化，此外，Fe/CaO催化剂还对萘类化合物的产生有促进作用。Fe/CaO催化剂催化后焦油中两环化合物的含量增多，三环及以上的化合物含量减少，焦油分子量呈减少的趋势。

Pyrolysis characteristics of ash-free Xuzhou bituminous coal with Fe/CaO catalyst

Pyrolysis is an important utilization technology for coal, but the by-product tar is extremely harmful, and catalytic upgrading is one of the efficient and clean utilization methods of coal tar. In this paper, the catalytic pyrolysis experiments of ash-free Xuzhou bituminous coal were carried out in a tube furnace reactor on Fe/CaO catalyst prepared by sol-gel method. The results showed that Fe/CaO catalyst could promote the production of pyrolysis gas significantly, and the yields of CO₂, CO and CH₄ increased gradually. Fe/CaO catalyst promoted the catalytic cracking of liquid product, resulting in a significant decrease in liquid yield. Fe/CaO catalyst promoted the conversion of polycyclic aromatic hydrocarbons to aliphatic hydrocarbons and light aromatics. In addition, the production of naphthalene compounds was also promoted by Fe/CaO catalyst. The contents of bicyclic compounds in tar increased while that of the tricyclic and polycyclic compounds decreased, the molecular weight of the tar presented a declining tendency.