复合型镍锌纳米线脱硫剂的制备及其脱硫性能研究

采用水热法合成了复合型镍锌纳米线脱硫剂，考察了溶剂中水和乙醇的比例对复合型镍锌纳米线晶体结构和形貌的影响，通过X射线衍射（XRD）、扫描电镜（SEM）、透射电镜（TEM）等方法对脱硫剂进行了表征；以正庚烷-噻吩为模型化合物，在反应温度为350℃、压力1.0 MPa、进料的体积空速6 h^-1及氢油体积比为60的条件下，考察了复合型镍锌纳米线脱硫剂、负载型镍锌纳米线脱硫剂以及纯氧化锌纳米线脱硫剂的脱硫性能。结果表明，由于复合型镍锌纳米线脱硫剂具有良好的纳米线形貌，活性组分金属镍具有更好的分散性、更小的粒径，同时形成了有利于脱硫的NiZn合金，所以其脱硫性能明显高于负载型镍锌纳米线脱硫剂和纯氧化锌纳米线脱硫剂，达到98%；而且复合型镍锌纳米线脱硫剂经过五次再生后，其使用寿命仍能保持90 h，这说明复合型镍锌纳米线脱硫剂具有很好的再生性能。

Study on the synthesis of composite NiO-ZnO nanowire adsorbent and its performance for desulfurization

The composite NiO-ZnO nanowires for desulfurization were synthesized using hydrothermal method. The effects of the ratio of ethanol to water in the solvent used for the nanowire synthesis were studied. The phase structure and morphology of the nanowire adsorbents were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM). The desulfurization performance of the adsorbents were studied at the temperature of 350℃, pressure of 1.0 MPa, the volume space velocity of 6 h^-1, and H₂/oil volume ratio of 60. The results showed that the composite NiO-ZnO nanowire adsorbent has better morphology than others, the active catalytic site was determined to be Ni which seemed to have better dispersion and smaller particle size, and the Ni-Zn alloy preferred to desulfurization was formed, so its desulfurization performance was significantly improved. The desulfurization rate was increased up to 98%. After five circles of regeneration, the activity of the composite NiO-ZnO nanowire adsorbent can still maintain 90 h, which indicated that it possesses better reusability.