首页|Elucidating the mechanisms of titanium-induced morphological and structural changes in catalysts on mesoporous Al2O3-TiOx mixed oxides: Effect of non-stoichiometric TiOx phase
Elucidating the mechanisms of titanium-induced morphological and structural changes in catalysts on mesoporous Al2O3-TiOx mixed oxides: Effect of non-stoichiometric TiOx phase
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In the present work,mesoporous Al2O3-TiOx composites with different titania loadings(4,8 and 12 wt%)were synthesized to evaluate the effect of non-stoichiometric TiOx phases on the hydrodesulfurization(HDS)ability of the CoMo/Al2O3-TiOx catalysts.The activity of the catalysts was evaluated in the dibenzothiophene(DBT)HDS reaction carried out at 593 K,5.5 MPa in a batch reactor.Regardless of the TiOx content,all sulfided CoMo Al2O3-TiOx catalysts were more active than the C0M0/Al2O3 catalyst.For all catalysts,DBT HDS occurs mainly through the direct desulfurization(DDS)pathway(95-97% selectivity).The most active catalysts(CoMo-12 and CoMo-4)showed evidence of the presence of non-stoichiometric titanium oxides.The synthesized materials were characterized in depth to evaluate their crystallinity,textural and morphological properties,elemental composition and acidity.Their characterization showed that:(i),the Al2O3-TiOx interaction increased with decreasing TiOx content;(ii)the strong interaction between TiOx particles and alumina led to the formation of more defined TiOx structures;(iii),an increase in titania content led to the growth of TiOx crystals along the [101] direction(relative to the [001] direction),which in turn,led to the different TiOx morphologies: nanorods->> nanotubes-> U-shaped nanotubes.The TiCoMoS phase can be formed if the process is performed on Ti305 instead of TiO2.
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