New hydrotreating NiMo catalysts supported on MCM-41 modified with phosphorus

A series of MCM-41 supports modified with phosphorus (0–5 wt.% P 2O 5) and their respective NiMo catalysts were prepared and characterized by N 2 physisorption, XRD, ammonia TPD, temperature programmed reduction (TPR), UV–vis diffuse reflectance spectroscopy (DRS), chemical analysis and HRTEM. It wa...

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Bibliographic Details
Published in:Microporous and mesoporous materials 2005-09, Vol.83 (1), p.283-291
Main Authors: Herrera, José Manuel, Reyes, Javier, Roquero, Pedro, Klimova, Tatiana
Format: Article
Language:English
Subjects:
4,6-Dimethyldibenzothiophene
Catalysis
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Hydrodesulfurization
MCM-41
NiMo catalysts
Phosphorus
Porous materials
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:A series of MCM-41 supports modified with phosphorus (0–5 wt.% P 2O 5) and their respective NiMo catalysts were prepared and characterized by N 2 physisorption, XRD, ammonia TPD, temperature programmed reduction (TPR), UV–vis diffuse reflectance spectroscopy (DRS), chemical analysis and HRTEM. It was shown that phosphorus insertion in the siliceous MCM-41 causes a deterioration of the textural characteristics and some loss in the periodicity of the MCM-41 pore structure. However, the acidity of MCM-41 material increases with P loading. XRD, DRS, TPR and HRTEM show that the characteristics of oxide and sulfided Mo and Ni species change with P incorporation in the MCM-41 support. Hydrodesulfurization (HDS) of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) was used to evaluate the activity of the prepared catalysts. It was shown that the modification of MCM-41 with phosphorus results in high-performance NiMo catalysts especially for HDS of the most refractory dibenzothiophenes, such as 4,6-DMDBT. Catalysts of NiMo/P-MCM-41 series showed higher catalytic activity in 4,6-DMDBT HDS than the reference NiMo/Al 2O 3 counterpart. Maximum catalytic activity in this case was observed for the catalyst supported on MCM-41 with 1 wt.% P 2O 5. Reaction product analysis shows that phosphorus addition promotes hydrogenation pathway of HDS.
ISSN:1387-1811
1873-3093
DOI:10.1016/j.micromeso.2005.05.010