HYDROCRACKING OF GUDAO RESIDUE WITH DISPERSED-PHASE MO CATALYST

In this study, hydrocracking of Gudao vacuum residue was carried out i n an internally stirred autoclave in the presence of several kinds of dispersed water and oil soluble unsupported Mo catalysts. The benzene insolubles formed were examined by X-ray diffraction (XRD), scanning e lectron microscopy (SEM) and transmission electron microscopy (TEM). T he chemical compositions of the cracked gases and residues were analys ed by gas chromatography and liquid chromatography (SARA method), resp ectively. From the XRD analyses, it was identified that the possible c atalytically active phase generated from the dispersed Mo catalyst pre cursor was microcrystalline MoS2. The results indicate that the high d ispersion method of the water soluble catalyst precursor postulated in this study, can promote catalytic activity of the catalyst. The exper imental results also suggest that the dispersed-phase Mo catalyst can considerably inhibit polycondensation of resins and asphaltenes, and d elay coke formation by way of promoting hydrogenation and hydrodesulfu rization.