Národní úložiště šedé literatury Nalezeno 11 záznamů.  1 - 10další  přejít na záznam: Hledání trvalo 0.00 vteřin. 
Deposition of Mo and Co Sulfides on Unconventional Silica-alumina Supports for Model Hydrotreating Reactions
Gulková, Daniela ; Kaluža, Luděk ; Zdražil, Miroslav ; Vít, Zdeněk
The mesoporous silica-alumina (SA) was modified by acid leaching which was accompanied with increase of the BET surface area and exposition of strong acidity in cumene cracking and in cyklohexene isomerization. The acid leaching positively affected the activities of the sulfided CoMo catalysts in benzothiophene HDS.
Plný tet: SKMBT_C22012110811240 - Stáhnout plný textPDF
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Inhibition of Benzothiophene HDS by Quinoline on PdMo and CoMo/Al2O3 Catalysts
Vít, Zdeněk ; Kaluža, Luděk ; Gulková, Daniela
In this work, the effect of quinoline on benzothiophene HDS was compared with the effect of pyridine on thiophene HDS. This is because benzothiophene and quinoline are closer to practical application.The main goal is to find, if the highrr nitrogen tolerance observed during thiophene reaction occurs also with heavier sulfur and nitrogen molecules. Mo/Al2O3 modified by Pd was selected for this study.
Plný tet: SKMBT_C22012110811243 - Stáhnout plný textPDF
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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.
Plný tet: SKMBT_C22012102413541 - Stáhnout plný textPDF
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Inhibitive Effect of Pyridine and Toluene on HDS of Thiophene over Mo/Al2O3 Based Catalysts
Gulková, Daniela ; Vít, Zdeněk
It was found that HDS activities of Mo and CoMo catalysts were strongly inhibited by pyridine and activity of RhMo catalyst was inhibited less. On the other hand, suppression of HDS by toluene over Mo catalyst was very small and no suppression by toluene was observed over the promoted CoMo and RhMo catalysts.
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Inhibiční vliv pyridinu na HDS na Mo/Al2O3 modifikovaném vzácnými kovy
Vít, Zdeněk ; Kaluža, Luděk ; Gulková, Daniela ; Zdražil, Miroslav
Byla studována citlivost katalyzátorů v HDS thiofenu k inhibici pyridinem. CoMo katalyzátory byly nejaktivnější v samotné HDS, ale nejcitlivější k inhibici. Mo/Al2O3 modifikované Ru a Rh byly mnohem více tolerantní k inhibici.
Vliv nosiče na hydrodesulfurizaci thiofenu na sulfidu rhodia
Kaluža, Luděk ; Vít, Zdeněk ; Zdražil, Miroslav
Studie vlivu nosiče na aktivitu naneseného sulfidu rhodia při hydordesulfurizaci thiofenu ukázala, že stukturní a texturní vlastnosti oxidických nosičů (např. Al2O3) značně ovlivňovaly výslednou aktivitu. Nicméně, rhodium nanesené na aktivovaném uhlí překonalo aktivity všech vzorků na oxidických nosičích více než 4 krát.

Národní úložiště šedé literatury : Nalezeno 11 záznamů.   1 - 10další  přejít na záznam:
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