Citation: ZENG He, SHI Yan, LI Heming, WANG Chen, WANG Haiyan. Effect of Aluminium Oxide and Phosphorus Modification on Structure and Hydrodesulfurization Performance of Unsupported Catalysts[J]. Chinese Journal of Applied Chemistry, ;2016, 33(8): 951-959. doi: 10.11944/j.issn.1000-0518.2016.08.150425 shu

Effect of Aluminium Oxide and Phosphorus Modification on Structure and Hydrodesulfurization Performance of Unsupported Catalysts

1.
Chemical Industry and Environment Department of Petrochemical College, Liaoning University of Petroleum Chemical Industry, Fushun, Liaoning 113001, China

Corresponding author: WANG Haiyan,
Received Date: 1 December 2015
Available Online: 4 March 2016
Fund Project:

Unsupported Ni-Mo hydrodesulfurization catalysts were prepared by a coprecipitation method and characterized by X-ray diffraction(XRD), nitrogen physisorption measurement(BET), infrared spectroscopy(Py-IR, FI-IR), H₂-temperaure programmed reduction(H₂-TPR), temperature-programmed desorption of NH₃(NH₃-TPD), Laser Raman spectroscopy(LRS) and gas chromatography analysis(GC-PFPD) tests. The effects of Al₂O₃ and phosphorus addition on the structure of the catalysts were studied. The results indicate that the addition of Al₂O₃ greatly increases the pore diameter, specific surface area, the amount of the L acid sites and also promotes the formation of B acid sites. Addition of phosphorus leads to the formation of the Al-P-O structure instead of the NiAl₂O₄ structure, and weakens the interaction between active phase and Al₂O₃. The amount of tetrahedral Mo species decreases while the anount of octahedral Mo species increases. The catalysts has a longer service life. The catalyst acidity is changed from strong to weak by adding phosphorus. The hydrodesulfurization rate is increased from 94% to 99.8%. At 280 ℃, hydrogen pressure of 4 MPa, liquid hourly space velocity(LHSV) of 1.5 h^-1 and hydrogen-to-oil volume ratio of 500, 4-methyldibenzothiophene, 4,6-dimethyldibenzothiophene and 2,4,6-trimethyldibenzothiophene catalytic cracking are depthly removed in fluid catalytic cracking diesel oil; the sulphur concentration is decreased from 3950 μg/g to 7.9 μg/g.
- unsupported catalysts,
- Ni-Mo,
- hydrodesulfurization,
- aluminium oxide,
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