SBA-15 modified with Al, Ti, or Zr as supports for highly active NiW catalysts for HDS

Tuning Hydrodesulfurization Active‐Phase Dispersion using Optimized Mesoporous Titania‐Doped Silica Supports

“…Despite the lower degree of stacking achieved over NiW/Ti-SBA, this catalyst gave almost 100 % of DBT conversion within 8 h of reaction, which was approximately 10 % higher than that over the pure SBA-15-supported catalyst. [40] Pseudo-first-order rate constants determined for the different catalysts confirmed the better performance of NiW/Ti-SBA compared to NiW/SBA, which was attributed to the better dispersion of the active phase on this support. Clearly, an improved metal-support interaction between the CoMo oxidic phase and the TiO 2 nano-crystal surface can be a reason for the higher dispersion, as already suggested for the Ti-containing SBA-15 NiMoS phase that exhibits improved dispersion and catalytic activity in DBT and 4,6-DMDBT compared to its counterpart supported on pure SiO 2 .…”

“…Studies on Ti-modified SBA-15 by chemical grafting used as supports for HDS catalysts have already been reported. [38][39][40] In the grafting procedure, calcined SBA-15 was slurried in dry ethanol that contained titanium isopropoxide. To eliminate the excess Ti precursor, the filtered material was washed with ethanol three times.…”

“…The authors related the high catalytic activity of the NiMo/Ti-SBA-15 solids to their high hydrogenation activity and promotion of the hydrogenation (HYD) pathway of 4,6-DMDBT HDS because of the changes in the morphology of the MoS 2 active phase induced by the presence of Ti atoms on the support. Lizama and Klimova [40] reported the preparation of a NiW catalyst (9.5 wt % W and 2.4 wt % Ni) supported on Ti-modified SBA by chemical grafting with 16 wt % equivalent of TiO 2 . The sulfided catalyst supported on Ti-modified SBA-15 showed a better dispersion (smaller average stacking degree and slab length) than the NiW/SBA sample, which is similar to our results over Ti-modified SBA-15 supports.…”

“…Moreover, the impregnation method allows sensibly higher quantities of Ti to be deposited. Indeed, several groups have prepared Ti-SBA composites by grafting methods, but did not explore a large range of TiO 2 loadings (16-19 wt %TiO 2 ), [38][39][40][41] even if the studied ranges are already higher than the Ti atom solubility in the SiO 2 framework. In the present work, a previously optimised method was used to prepare TiO 2 -SBA-15 composite materials with TiO 2 loadings from 10-40 wt % TiO 2 .…”

Catalytic Oxidative Dehydrogenation of n‐Butane on Gallium Nitride‐Containing Titanosilicate Catalyst

“…[17] Generally, the bands at ∼960 cm −1 can be assigned to the Ti-O-Si vibration for titanosilicate materials. [27,[32][33][34][35] The band peaks in Figure 3 show that the bands of Ga ≡ N stretching vibrations cannot be detected by FTIR spectra; however, after GaN was supported on Ti-SBA-15, the intensity of the band at ∼960 cm −1 increases, revealing that the interaction between GaN and TiO 2 may be presented, which is confirmed by the following XPS results. Therefore, the intensity of the peak at 960 cm −1 shows an increased tendency after the introduction of GaN.…”