Ni2P/HZSM-5上噻吩加氢脱硫性能研究

采用程序升温还原方法制备了Ni2P/HZSM5催化剂。用X射线衍射 (XRD)、低温N2吸附（BET）、扫描电镜(SEM)等技术对催化剂样品的物相、比表面积、形貌等性质进行了表征。在连续微反系统中测定了Ni2P/HZSM5催化剂对噻吩加氢脱硫催化活性；研究了Ni2P负载量、前驱体中Ni/P摩尔比对催化剂的物相及性能的影响，考察了空速、反应温度、反应压力等操作条件对催化剂上噻吩加氢脱硫性能的影响。实验结果表明，Ni2P/HZSM5催化剂对噻吩加氢脱硫反应具有较高的活性和稳定性。随着Ni2P负载量、前驱体中Ni/P摩尔比的增加，催化剂的活性和稳定性先升高后降低。反应温度和体积空速对Ni2P/HZSM5催化剂的噻吩加氢脱硫性能有较明显的影响，反应压力和进料氢油比的影响相对较小。

Study on catalytic activity of Ni2P/HZSM-5 in thiophene hydrodesulfurization

A series of supported Ni2P catalysts on HZSM-5 were prepared via the method of temperature programmed reduction (TPR). The structure characteristics of samples have been characterized by means of N2 BET, XRD, and SEM techniques. Thiophene hydrodesulfurization (HDS) was chosen as a model reaction to investigate the influences of Ni loading and initial Ni/P mol ratio. The results show that Ni2P phase is formed on the support of HZSM-5. Ni2P/HZSM-5 catalysts have high activity and excellent stability in thiophene HDS reaction. The preparation factors have great effects on the activity and stability of thiophene HDS reaction. With the increase of Ni2P loading and the initial P/Ni mol ratio, the activity and stability of the Ni2P/HZSM-5 catalyst increase firstly and then decrease. The influence of reaction conditions such as liquid space velocity, reaction temperature, reaction pressure, hydrogen to oil ratio on thiophene HDS performance were also studied. An optimum Ni2P/HZSM-5 catalyst was obtained from the precursor with initial phosphorus (Ni/P=1/3 mol ratio) at Ni loading of around 5%. It has substantially high thiophene HDS conversion (~100%) and stability (more than 100h) at the condition of 370℃, 2.0MPa, a VHSV of 3h-1 and a hydrogen to oil ratio (v/v) of 200.