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Comparison of the morphology and HDS activity of ternary Co-Mo-W catalysts supported on P-modified SBA-15 and SBA-16 substrates
- Source :
-
Applied Catalysis B: Environmental . Oct2009, Vol. 92 Issue 1/2, p168-184. 17p. - Publication Year :
- 2009
-
Abstract
- Abstract: Phosphate-loaded mesoporous SBA-15 and SBA-16 materials were used as supports of novel ternary Co-Mo-W hydrodesulfurization catalysts. The effects of support morphology (SBA-15 against SBA-16) and its modification with variable amounts of phosphorus were studied. The sulfided catalysts were tested in a reaction of hydrodesulfurization (HDS) of dibenzothiophene (DBT) at 350°C and 3.1MPa of total H2 pressure. The calcined, fresh sulfided and spent catalysts were characterized by a variety of techniques (N2 adsorption–desorption isotherms, XRD, TPR, TPD-NH3, DRS UV–vis, micro-Raman spectroscopy, XPS, HRTEM and TPO/TGA). Regardless of the support, it was found that the presence of phosphorous inhibited the HDS activity, and the catalytic response of both SBA-15- and SBA-16-based systems did not depend on the support morphology. In terms of the reaction rate constants (k), both CoMoW/SBA-15 and CoMoW/SBA-16 catalysts were more active than a CoMo/Al2O3 commercial catalyst containing a small amount of phosphorous in its formulation. In general, the spent CoMoW/(x)P-SBA-16 catalysts showed a lower coke formation than their SBA-15-based counterparts because the phosphate incorporation to the SBA-16 material led to decrease in coke formation in the final catalysts, as opposite to the behavior of SBA-15-based counterparts. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09263373
- Volume :
- 92
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- Applied Catalysis B: Environmental
- Publication Type :
- Academic Journal
- Accession number :
- 44260622
- Full Text :
- https://doi.org/10.1016/j.apcatb.2009.07.012