Albiter M A, Huirache-Acuña R, Paraguay-Delgado F, Zaera F, Alonso-Núñez G
Centro de Investigación en Materiales Avanzados, Miguel de Cervantes No. 120, Complejo Industrial Chihuahua, CP 31109, Chih., México.
J Nanosci Nanotechnol. 2008 Dec;8(12):6437-44.
In this study Co(Ni)/MoS2 unsupported nanocatalysts (nanorods and nanoribbons) were synthesized with Co(Ni)/(Co(Ni) + Mo) = 0.3, 0.5 molar ratios for Co and Ni respectively. First the alpha-MoO3 nanostructures were impregnated with an aqueous solution of Co(Ni)Cl2 x 6H2O or Co(Ni)(NO3)2 x 6H2O, then were treated for 2 h at 473 K, and finally the precursors were activated under a H2S/H2 mixture (15% v/v H2S) by ramping the temperature from room temperature to 773 K and keeping it at that value for 2 h. The resulting materials were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, X-ray diffraction, specific surface area and X-ray photoelectron spectroscopy, and tested as catalysts for the hydrodesulfurization (HDS) of dibenzothiophene (DBT). It was found that these materials presented specific surface areas below 25 m2/g. The catalytic test showed that only when Co is added a promoter effect is observed compared with MoS2 unpromoted catalysts. Among the materials prepared, the Co/MoS2 catalyst made from cobalt chloride presented the highest catalytic activity (6.95 mol s(-1) g(-1)catalyst) for the HDS of DBT. The selectivity for the latter indicated a clear preference for the direct desulphurization over the hydrogenating pathway.
在本研究中，合成了无载体的Co(Ni)/MoS₂纳米催化剂（纳米棒和纳米带），其中Co和Ni的Co(Ni)/(Co(Ni) + Mo)摩尔比分别为0.3和0.5。首先，用Co(Ni)Cl₂·6H₂O或Co(Ni)(NO₃)₂·6H₂O的水溶液浸渍α-MoO₃纳米结构，然后在473 K下处理2 h，最后通过将温度从室温升至773 K并在该温度下保持2 h，在H₂S/H₂混合气（15% v/v H₂S）中对前驱体进行活化。通过扫描电子显微镜、能量色散X射线光谱、透射电子显微镜、X射线衍射、比表面积和X射线光电子能谱对所得材料进行了表征，并测试了其作为二苯并噻吩（DBT）加氢脱硫（HDS）催化剂的性能。发现这些材料的比表面积低于25 m²/g。催化测试表明，与未促进的MoS₂催化剂相比，仅当添加Co时才观察到促进效应。在所制备的材料中，由氯化钴制成的Co/MoS₂催化剂对DBT的HDS表现出最高的催化活性（6.95 mol s⁻¹ g⁻¹催化剂）。对后者的选择性表明，与加氢途径相比，对直接脱硫有明显的偏好。
