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Study of Sulfided NiMo Catalysts and Preparation Process for Diesel Hydrotreating

Author: RenHongWei
Tutor: WangFangZhu
School: China University of Petroleum
Course: Chemistry
Keywords: Dibenzothiophene Active Catalyst Active phase Preparation method
CLC: TE624.93
Type: Master's thesis
Year: 2011
Downloads: 105
Quote: 0
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Abstract


Hydrodesulfurization process is the key technology for the production of ultra low sulfur diesel , high-performance hydrodesulfurization catalyst is one of the core . Paper gamma - alumina as the carrier , the the using body integration step impregnated prepared a series of NiMoS / gamma - Al 2 < / sub > O 3 < / sub > catalyst , and the physical and chemical properties of the catalyst characterization , while the selective hydrodesulfurization catalyst performance was evaluated. Hydrodesulfurization catalyst surface properties and preparation methods on the catalytic activity and selectivity of the catalytic reaction process conditions were optimized . The results showed that the component Ni introduced to improve the degree of dispersion of the catalytic active component on the carrier surface , and the Ni content can affect the structure of the catalyst active phase . As the Ni content increases , MoS 2 < / sub > -chip layer length decreases improve dispersion of the active phase , and thus the the hydrodesulfurization catalyst activity and selectivity improvement . The effects of its catalytic properties of the catalyst preparation method . The study showed that the activity of the catalyst to its impregnation sequence , first impregnated with ammonium molybdate solution is higher than the activity of the catalyst of the first impregnated with an aqueous solution of nickel nitrate was prepared . Ligand solution using ammonium molybdate instead of ammonium molybdate aqueous solution , and calcined in a tubular furnace to prepare the catalyst , its activity significantly increased . Under the pressure of 2MPa, temperature 300 ° C , space velocity of 10h - 1 and hydrogen to oil volume ratio of 300:1 for the reaction conditions , when a metal loading of 26wt% ( NiO MoO 3 < / sub > -total ) Ni / ( Ni Mo ) atomic ratio is 0.3 , catalyst NiMoS / gamma - Al 2 < / sub > O 3 < / sub > the desulfurization rate can reach more than 87% selectivity to BP 91%. The activity and selectivity of the catalyst with the reaction temperature increases. For the sulfided catalyst NiMoS / gamma - Al to 2 < / sub > O 3 < / sub > , does not require pre-treatment, can directly feed .

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CLC: > Industrial Technology > Oil and gas industry > Oil, natural gas processing industry > Petroleum refining > The refining process > Catalyst > Catalytic hydrogenation catalyst
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