The Preparation Of Catalysts And HDO Research With NiW/CNTs

Coal-tar, bio-oil and oil-shale, as unconventional oil resources, have showed huge potential and development prospects with world oil resources being depleted. However, compared with the crude oil, unconventional oil often contained higher heteroatom(S,N,O) content, traditional noble metal catalysts are liable to be poisoned, transition metal sulfide catalysts have high HYD activities and good resistance to Sand N, so they can be used in purification of unconventional oil.In this work, a series of NiW/CNTs catalysts with different Ni/W molar ratio and loading were prepared by incipient impregnation. Results shouwed that, the optional initial Ni/W ratio was 0.48 and the activity of high-loading catalysts were higher than low-loading.Sulfied NiW/CNTs catalysts had higher activity and stability. The NiW/CNTs catalysts were characterized by X-ray diffraction (XRD) and brunauer-emmett-teller (BET), etc.Naphthalene was chosen as HYD model compounds, results showed that, the conversion rate of naphthalene with NiW/CNTs can be as high as 100%, tetralin production rate was as high as 88.48%, minimum 14.67%, total yield of decalin can be as high as 84.17%. Tetralin can generate naphthalene by dehydrogenation, decalin can generate tetralin by dehydrogenation. The cis/trans ratio was maximizing after decalin hydrogenation, up to 8.699.The presence of p-cresol affected the product distribution of naphthalene hydrogenation, when contact time less than 17.3min promoted saturated hydrogenation of naphthalene, p-cresol would compete with naphthalene hydrogenation after more than 17.3min. The addition of quinoline and DBT impacted naphthalene's catalytic hydrogenation in NiW/CNTs, but the effect was reversible, active would return to the initial value.The research of catalytic hydrogenation deoxidization reaction of p-cresol can be concluded that the catalytic hydrogenation of p-cresol in NiW/CNTs is priority to HYD path, p-cresol conversion rate up to 100%. When the temperature was 300 ?, the methylcyclohexane yield was up to 79.95%; when gas-liquid ratio was 500 (v/v), it was the most conducive to the HYD path of p-cresol. In the case of the existence of naphthalene, the short contact time promoted the DDO path of p-cresol. While the existence of quinoline inhibited the HYD path of p-cresol, the existence of thiophene was promoted the HYD path of p-cresol.