NiW/Al2O3-Y催化剂的制备及其对煤焦油加氢处理的研究

以不同比例的γ-Al₂O₃和Y型分子筛为混合载体制备NiW/Al₂O₃-Y催化剂,采用N₂低温吸附、XRD、H₂-TPR 和 NH₃-TPD对其进行表征,并在固定床上通过甲酚-萘溶液的加氢处理反应对催化剂活性进行评价。结果表明,催化剂均具有良好的加氢脱氧及加氢饱和性能,异构化及裂化产物随分子筛含量的增加而增加,催化剂酸性增加更有利于萘加氢产物中反式十氢萘的生成。以较佳催化剂对低温煤焦油馏分进行加氢处理,采用GC-MS和元素分析等对油品进行分析。原料中绝大部分酚类化合物及双环芳烃转化为茚、环烷烃和氢化芳烃等化合物,同时明显降低了杂原子尤其是硫和氧的含量。

Preparation of NiW catalysts with alumina and zeolite Y for hydroprocessing of coal tar

γ-alumina supported Ni-W catalysts with different zeolite Y contents were prepared and characterized by N₂ sorption, XRD, H₂-TPR and NH₃-TPD. Their catalytic activities were investigated on a trickle bed reactor by hydroprocessing cresol-naphthalene model compounds in n-heptane solution. The results show that all the catalysts exhibit excellent hydrodeoxygenation and hydrogenation activities, while the isomerization and ring-opening products increase with the addition of zeolite, and trans-decalin is preferred with acid sites. A better catalyst was selected for hydroprocessing a low temperature coal tar fraction and the product oil was analyzed by GC-MS and elementary analysis. Phenols and di-aromatics in the tar are almost converted into indans, cycloalkanes and hydro-aromatics. In the meantime, heteroatoms, especially S and O atoms, reduce remarkably.