Effect of Calcination Temperature of Unsupported NiMo Catalysts on the Hydrodesulfurization of Dibenzothiophene

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• 作者：Huan Liu ; Changlong Yin ; Bin Liu ; Xuehui Li ; Yanpeng Li ; Yongming Chai ; Chenguang Liu
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：April 17, 2014
• 年：2014
• 卷：28
• 期：4
• 页码：2429-2436
• 全文大小：572K
• 年卷期：v.28,no.4(April 17, 2014)
• ISSN：1520-5029

文摘

The effects of NiMo catalyst calcination temperature (250, 350, 450, 550, and 650 掳C) on catalytic hydrodesulfurization of dibenzothiophene (DBT) were studied. The physiochemical properties of the unsupported NiMo catalysts were characterized by various techniques, including N₂ adsorption鈥揹esorption, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM). XRD and FT-IR results showed that increasing the calcination temperature brought about a phase change of the NiMo catalyst precursors from ammonium nickel molybdate to nickel molybdate. The agglomeration of precursor particles and MoS₂ nanoclusters changed with various calcination temperatures as revealed by SEM and HRTEM, respectively. DBT catalytic results showed that the NiMo catalyst calcined at 350 掳C exhibited higher activity than other NiMo catalysts, and the selectivity of bicyclohexane was much preferred at a reaction temperature of 320 掳C over NiMo catalysts endowed with the phase of ammonium nickel molybdate. The high hydrogenation ability might be due to the efficient formation of the 鈥淣i-Mo-S鈥?phase and will be attractive for industrial applications.