Preparation And Catalytic Performance Of Hydrogenation Catalysts On Low Temperature Coal Tar

Low temperature coal tar is an inevitable byproduct produced in the coal pyrogenation process. In recent years, with the rapid development of China’s economic and coal chemical industry, the output of coal tar increased quickly. The production of clean fuel oil from low-temperature tar, as a new alternative energy sources, is a method for improve high additional value of tar and strategic importance to ensure energy security. This paper focuses on the research in hydrogenation catalysts and hydroprocessing technology for technical support of clean fuel oil from low-temperature coal tar.Modified γ-Al2O3 supported Mo,Ni catalysts were prepared by coprecipitation method using nickelous nitrate, ammonium molybdate and ammonium metawolframate as raw materials. The BET, XRD, TPR, TPD, SEM and EDS techniques were employed to investigate the structure and characteristic of the catalyst. The results show that the catalyst calcinated at 600℃ and supported 20%(wt) MoO3 content have the higher specific surface area and active dispersion.On the basis of the synthesis of catalysts, the catalytic hydrogenation of phenathrene as model compound of polycyclic aromatic hydrocarbon was investigated. The influence of reaction conditions on the conversion of phenathrene and selectivites of products was explored. The conversation of phenanthrene eventually reach 70.69% at 400℃ and 9 MPa, which the catalysts exhibited high activity of hydrocracking, strong aromatic saturation and good isomerization performance.The reaction pathway of phenathrene was proposed as hydrogen storage intermediate.The anthracene oil was used as component of polycyclic aromatic hydrocarbon in coal tar.The hydrogenation was also researched the hydrotreating convertion of the polycyclic aromatic hydrocarbons and heterocyclic compounds. For anthracene oil, polycyclic aromatic hydrocarbons remove higher, and heterocyclic compound sulfur removal rate was 100%. The experiments can provide theoretical and test data for industrialization on hydrogenation of low-temperature coal tar.