HYD And HDS Of Model Compounds With Ni₂P/CNTs

Coal-tar, bio-oil and oil-shale, as innovative energy sources, have attracted considerable attention due to the rapid consumption of the decreasing quality of available petroleum feedstock and the increasingly stringent environmental regulations of oil have been made by countries around the world. However, compared with traditional oil refining and petrochemical industries, the components of coal-tar are intricate which includes aromatics and dibenzothiophene and their derivatives and so on. In recent years, phosphides of transition metals are considered anticipated substitutes for traditional HYD and HDS catalyst of Pt and CoMo materials, and Ni2P are highly active for HYD and HDS of petroleum and biomass-derived feedstock.In this work, naphthalene and 1-methylnaphthalene (1-MN) were chosen as HYD model compounds, and the dibenzothiophene (DBT) as HDS model; it was prepared and characterized Ni2P/CNTs to investigate the selective HYD of these to decalin and the HDS pathways of DBT. The catalysts were prepared by incipient impregnation and evaluated by TPR and characterized by X-ray diffraction (XRD), brunauer-emmett-teller (BET), X-ray photoelectron spectroscopy (XPS), trans-mission electron microscopy (TEM) and Fourier transform infrared spectroscopy of pyridine (pyridine-FTIR), to investigate the relationship between the structure and catalytic activity.For higher yield of decalin and 1-methly decalin (1-MD), the study are aimed to investigate the effects of different factors:the molar ratio of Ni/P and Ni2P loading amount, contact time, reaction temperature, gas-liquid ratio, hydrogen pressure, co-existence impact on HYD of naphthalene and 1-MN, respectively. The results indicate the lower temperature and higher pressure contribute to high selectivity of decalin and 1-melthy decalin. The effect of competition of co-existence with naphthalene in HYD of 1-MN shows that the yield of 1-MD exceeded the initial yield of 1-MD which can be ascribed to the hydrogen donating effect of decalin and tetralin. The DBT and quinoline have little influence on the HYD of naphthalene over Ni2P/CNTs catalyst.Furthermore, the catalysts were used for HDS of DBT and the conversion can reach 100% with selectivity of BCH is 62.8%. The HDS undergoes the HYD pathway and the optimum H2/liquor is 500 and the optimum temperature is 340℃.The quinolone and naphthalene has an inhibition effects on HDS of DBT.