Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9617661 | Microporous and Mesoporous Materials | 2005 | 9 Pages |
Abstract
A series of MCM-41 supports modified with phosphorus (0-5Â wt.% P2O5) and their respective NiMo catalysts were prepared and characterized by N2 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/Al2O3 counterpart. Maximum catalytic activity in this case was observed for the catalyst supported on MCM-41 with 1Â wt.% P2O5. Reaction product analysis shows that phosphorus addition promotes hydrogenation pathway of HDS.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Catalysis
Authors
José Manuel Herrera, Javier Reyes, Pedro Roquero, Tatiana Klimova,