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通过调变六次甲基四胺与金属钼盐的摩尔比例,以络合物分解法制备了碳氮夹杂钼基催化剂,并将其负载于氧化铝载体上.采用X射线衍射(XRD)、X射线光电子能谱(XPS)、低温氮吸附、元素分析等方法对催化剂进行了表征,发现碳氮夹杂钼基催化剂实为碳化钼(β-Mo2C)与碳氮化钼(Mo2CxNy)的混合物.以二苯并噻吩(DBT)的加氢脱硫反应(HDS)为探针,比较了负载型碳化钼、氮化钼及碳氮夹钼基催化剂的催化活性,发现由于夹杂催化剂中含有新的活性相Mo2CxNy而表现出高于碳化钼和氮化钼催化剂的催化活性.
By changing the molar ratio of hexamethylenetetramine and metal molybdenum salt, the molybdenum-carbon-nitrogen-based catalyst was prepared by complex decomposition method and supported on alumina carrier.X-ray diffraction (XRD) X-ray photoelectron spectroscopy (XPS), low temperature nitrogen adsorption, elemental analysis and other methods were used to characterize the catalyst. It was found that the molybdenum-based carbon-nitrogen mixed catalyst is actually a mixture of molybdenum carbide (Mo-C) and molybdenum carbonitride (Mo2CxNy). The catalytic activity of supported molybdenum carbide, molybdenum nitride and carbonitride-molybdenum-containing molybdenum-based catalysts was compared with DBT hydrodesulfurization (HDS) as a probe. It was found that due to the inclusion of new activity Phase Mo2CxNy while exhibiting higher catalytic activity than molybdenum carbide and molybdenum nitride catalysts.