TiO2 nanotubes supported NiW hydrodesulphurization catalysts: Characterization and activity

HDS performance of NiMo catalysts supported on nanostructured materials containing titania

“…High HDS activity observed in the above works was attributed to high dispersion of catalytically active MoS 2 particles and high sulfidability of Mo species [17][18][19]. Regarding NiW catalysts, it was also found that the catalysts supported on TiO 2 nanotubes resulted in two times higher thiophene conversion in comparison with the alumina and titania supported ones [21]. The above results show that nanotubular titania is a promising support for hydrotreating catalysts.…”

Influence of Na content on behavior of NiMo catalysts supported on titania nanotubes in hydrodesulfurization

“…However, the catalyst supported on nanotubes showed higher yields of ring opening of tetralin than the alumina-supported reference sample. Regarding NiW catalysts, it was also found that the catalysts supported on TiO 2 nanotubes resulted in two times higher thiophene conversion than the alumina-and titania-supported ones [20]. The above results show that nanotubular titania is a promising support for hydrotreating catalysts.…”

“…However, up to now, this important point has not been addressed properly. Among previously mentioned works [16][17][18][19][20], Na content was determined and reported as 0.59 wt.% only in one [19]. However, the behavior of this catalyst was tested in tetralin hydrogenation, where the effect of Na was not clearly observed.…”

Titanium Dioxide as a Catalyst Support in Heterogeneous Catalysis

“…It has been demonstrated that TiO 2 improve the performance of catalysts [35–39], allowing the modulation of catalytic activities for many reactions, including dehydrogenation [38, 39], hydrodesulphurization [37], water gas shift [36], and thermal catalytic decomposition [35]. …”

“…The limitations included small specific surface areas, low quantum efficiency, and low adsorption abilities [36, 37]. Furthermore, both costs and difficulties in the separation of catalyst from the reaction media and inadequacy for continuous processing limited the applications of TiO 2 as a heterogeneous catalyst in large-scale industries [38].…”