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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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Vysokopovrchové hydrodesulfurizační katalyzátory MoO3/TiO2
Gulková, Daniela ; Kaluža, Luděk ; Vít, Zdeněk ; Horáček, Jan ; Macháčková, Eva ; Zdražil, Miroslav
MoO3/TiO2 were prepared by impregnation of TiO2 supports with surface areas of 140, 230 and 407 m2g-1. MoO3 loading was in the range 2-32wt.%. The point of zero charge of the supports was 5.0, 8.1 and 10.5, respectively, and decreased with MoO3 loading to the value for MoO3 (2.1). According to the point of zero charge the supports were saturated with a molybdena monolayer at approximately 12, 24 and 14 wt.%, respectively. Temperature-programmed reduction exhibited four peaks, which were assigned to the stepwise reduction (Mo6+ to Mo4+ to Mo0) of tetrahedral monolayer species, po
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