Mo对非晶态合金Ni-B/薄水铝石催化剂上噻吩加氢脱硫性能的影响

采用浸渍-化学还原法制备了一系列不同Mo含量的Ni-Mo-B/薄水铝石非晶态合金催化剂样品.以噻吩加氢脱硫为探针反应,考察了样品的催化性能,并采用X射线衍射、差示扫描量热法、电感耦合等离子体发射光谱、程序升温还原、程序升温脱附、X射线光电子能谱和透射电镜等技术对样品进行了表征.结果表明,Mo的添加促进了Ni活性物种的分散,提高了催化剂的热稳定性,降低了催化剂的还原温度;同时,催化剂的吸氢强度减弱,酸性增强,从而显著提高了催化剂活性.当催化剂中Mo/Ni质量比为12%时活性最高,于220oC反应时,噻吩转化率达到73.9%.

Effect of Mo on Performance of Ni-B/Boehmite Amorphous Alloy Catalyst for Thiophene Hydrodesulfurization

A series of Ni-Mo-B/boehmite amorphous alloy catalyst samples with different Mo contents were prepared by the impregnation-chemical reduction method. Thiophene hydrodesulfurization (HDS) was chosen as a probe reaction to investigate the influence of Mo contents on HDS activity of the Ni-Mo-B/boehmite catalyst. The catalyst samples were characterized by X-ray diffraction, differential scanning calorimetry, inductive coupled plasma, temperature-programmed reduction, temperature-programmed desorption, X-ray photoelectron spectroscopy, and transmission electron microscopy. The addition of Mo increased the dispersion of Ni active species, improved the thermal stability of Ni-B/boehmite, decreased the reduction temperature, weakened the strength of Ni_H bonds, increased adsorption centers and acidity, and therefore promoted catalyst activity dramatically. At low temperature of 220 oC, when the Mo/Ni mass ratio is 12%, the conversion of thiophene is the highest, up to 73.9%.