络合物分解法制备碳氮夹杂钼基催化剂及其催化性能

The preparation of Mo_2C(N) catalyst through complex-decomposition method and its catalytic performance

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.

Bulk and A1203-supported Mo2C（N） catalyst was prepared through complex-decomposition method by adjusting the mol ratio of hexamethylenetetramine （HMT） and ammonium heptamolybdate. The as-prepared product was characterized by x-ray diffraction （XRD）, x-ray photoelectron spectroscopy （XPS）, low-temperature nitrogen adsorption and elemental analyzer, and confirmed that it was a mixture of molybdenum carbide （[3-M02C） and molybdenum carbonitride （Mo2CxNy）. To evaluate the catalytic performance of the resultant Mo2N, M02C, and Mo2C（N） catalyst, the hydrodesulfurization （HDS） of dibenzothiphene （DBT） was used as a probe reaction. The Al2O3-supported Mo2C（N） catalyst exhibited highest HDS activity, owing to the new active site of Mo2CxNy.