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采用共浸法制备了未经焙烧直接硫化的NiMo/ZrO2(550)、NiMo/ZrO2(650)催化剂及550℃焙烧后再硫化的NiMo/ZrO2(550)-1催化剂,在连续流动微反装置上考察了NiMo/ZrO2系列催化剂对噻吩加氢脱硫反应的催化活性,并对催化剂进行了X射线光电子能谱(XPS)和Raman光谱表征。表征结果显示,以四方相ZrO2为载体的NiMo/ZrO2(650)催化剂,由于被硫化的更完全,催化活性高于以无定形相ZrO2为载体的NiMo/ZrO2(550)催化剂,说明载体的结构影响催化剂的催化活性;550℃焙烧后的NiMo/ZrO2(550)-1催化剂的催化活性低于未经焙烧直接硫化的NiMo/ZrO2(550)催化剂,这是由于高温焙烧增加了活性组分和载体之间的相互作用,降低了催化剂的硫化程度,进而降低了其催化活性,说明这种强相互作用不利于提高催化剂的催化活性。
NiMo / ZrO2 (550) and NiMo / ZrO2 (650) catalysts were prepared by co-impregnation method, and then re-sulfided NiMo / ZrO2 (550) -1 catalyst was calcined at 550 ℃ in a continuous flow microreactor The catalytic activities of NiMo / ZrO2 catalysts for thiophene hydrodesulfurization were investigated. The catalysts were characterized by X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The characterization results show that NiMo / ZrO2 (650) catalysts supported on tetragonal ZrO2 are more completely sulfided and have higher catalytic activity than NiMo / ZrO2 (550) catalysts supported on amorphous ZrO2, indicating that the structure of the support The catalytic activity of NiMo / ZrO2 (550) -1 catalyst calcined at 550 ℃ is lower than that of NiMo / ZrO2 (550) catalyst without direct calcination, which is due to the increase of the active component and The interaction between the supports reduces the degree of sulfidation of the catalyst and further reduces its catalytic activity, indicating that this strong interaction is not conducive to increasing the catalytic activity of the catalyst.