非负载型NiMoW加氢催化剂的制备、表征和性能评价

以NiMoW复合氧化物为前躯体制备高活性非负载型NiMoW加氢催化剂，考察了制备过程中黏结剂、胶溶剂、熟化处理等因素对催化剂性能的影响。采用BET、XRD、SEM、TEM、强度测定、堆密度测定等手段对催化剂进行表征，采用模拟柴油体系和真实柴油为原料对催化剂进行活性评价。结果表明，选择合适的黏结剂、胶溶剂以及适宜的熟化处理方法，不但可以保持催化剂原有活性相结构，而且能减小催化剂颗粒度，增大比表面积及孔容、孔径，提高催化剂的机械强度。在345℃、7.0 MPa、空速2.0 h^-1条件下，采用熟化处理制备的NiMoW-H催化剂，可将柴油中的硫质量分数由3690 μg/g降低到9 μg/g，而NiMoP/Al₂O₃参比催化剂仅降低到103 μg/g。

Preparation,characterization and catalytic performance of unsupported NiMoW hydrotreating catalyst

Highly active unsupported NiMoW catalysts were prepared with NiMoW composite oxide as precursor. The effects of binders, peptizators and mature conditions on the performance of NiMoW catalysts were investigated. Nitrogen physisorption measurement (BET), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), strength test and bulk density test were used to characterize the NiMoW catalyst, and its catalytic activity was evaluated with the simulated diesel system and diesel as the feed. The results showed that proper choice of binder, peptizator combined with proper way of maturation could reduce the particle size of the NiMoW catalysts without damaging the original structure of crystals, further improve the properties of catalyst, such as enlarging its specific surface area, pore volume, pore size distribution and enhancing its mechanical strength. Under the conditions of temperature 345℃, hydrogen pressure 7.0 MPa and liquid hourly space velocity (LHSV) 2.0 h^-1, with the NiMoW-H prepared with maturation as catalyst, the sulfur content of diesel could be decreased from 3690  μg/g to 9  μg/g, while to 103 μg/g with NiMoP/Al₂O₃ as catalyst.