Abstract:

The thesis is to explore the effects of two different metal introduction methods on the catalytic pyrolysis product distribution of Shendong coal by introducing 5% transition metal Ni into the all-silicon ZSM-5 catalyst respectively with in-situ synthesis and equal volume impregnation. The synthesized catalysts are characterized by XRD, SEM, ICP and NH₃-TPD, etc. The results show that catalysts have little effect on the semi coke yield, but observable effect on the liquid yield and the gas yield. In comparison with the non-catalytic process, the all-silicon ZSM-5 catalyst reduces the liquid yield by 13.2%, while it increases the relative content of aliphatic hydrocarbons and monocyclic aromatic hydrocarbons in tar. Compared with the all-silicon ZSM-5 catalyst, the catalyst after equal volume impregnation significantly increases the production of H₂, CO in gas product, meanwhile increases the relative content of aliphatic hydrocarbons by 31.5% in tar; the in-situ synthesis of the metal-incorporated catalyst reduces the relative content of phenolic compounds, increases the relative content of naphthalene compounds and enriches the aromatic hydrocarbons in tar.

Key words: fluidized bed, pyrolysis, ZSM-5, Ni, catalysis, product distribution

摘要：

利用原位合成法、等体积浸渍法分别向全硅ZSM-5催化剂中引入5%的过渡金属Ni进行改性，并使用X射线衍射仪、扫描电镜、等离子发射光谱仪、全自动化学吸附仪等仪器对合成的催化剂进行表征，利用粉-粒流化床热解实验装置考察了不同金属引入方式对神东煤热解产物分布的影响。结果表明：催化剂对半焦收率的影响很小，对液体收率和气体收率的影响较明显。与非催化热解相比，全硅ZSM-5催化剂使液体产物收率降低了13.2%，但提高了焦油中脂肪烃和单环芳烃的相对含量。与全硅ZSM-5催化剂相比，浸渍改性的催化剂显著提高了气体产物中H₂、CO的生成量，并使焦油中脂肪烃的相对含量增加了31.5%；原位合成改性的催化剂使焦油中酚类物质相对含量减少，萘类物质相对含量增加，芳烃明显富集。

关键词: 流化床, 热解, ZSM-5, 镍, 催化作用, 产物分布