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Activity of CoMo/MSA Catalysts in Benzothiophene Hydrodesulfurization, Cumene Cracking and Cyclohexene Isomerization
Gulková, Daniela ; Kaluža, Luděk ; Zdražil, Miroslav ; Vít, Zdeněk
It was found that MoO3 does not adsorb onto pure SiO2 despite its relatively high surface area (400 m2/g). In contrast, SA52, MSA30, and MSA19 with surface areas 430, 580 and 600 m2/g adsorbed about 14, 7 and 3 wt. % of MoO3, respectively. The content of Al2O3 in the SA based materials thus well correlated with the adsorption loadings of MoO3 achieved by the saturation experiments. Moreover, it was acquired that the highest dispersion and HDS activities were achieved over catalysts containing dealuminated MSA supports despite of relatively low loadings of Mo. After Co deposition, the weight normalized activities in BT HDS increased 2.2 and 4.3 times on effective MoS2 promotion by Co on more acidic supports. Furthermore, those catalysts keep the high acidities of the original supports, as it was determined by cyclohexene isomerization and cumene cracking, while industrial reference CoMo catalysts supported onto gamma-Al2O3 was found to exhibit low acidity.
Fulltext: content.csg -  PDF
Plný tet: SKMBT_C22012102413541 - PDF
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Hydrodesulfurizace na sulfidických bimetalických katalyzátorech
Vít, Zdeněk ; Kaluža, Luděk ; Gulková, Daniela ; Zdražil, Miroslav
Alumina-supported Mo sulfide catalyst was promoted by small amounts of Pd, Rh, Pt and Ru (below 0.8 %). The activity in hydrodesulfurization (HDS) of benzothiophene (BT) was compared with activities of the conventional Mo/Al2O3 and CoMo/Al2O3 catalysts at 330-390oC and 16 bar. The addition of noble metals (NM) led to the improvement of activity and to synergetic effects (SE) up to about 4. The Pd promoted sample was the most active from all NM based catalysts, but less active in comparison to the CoMo system.
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