Effect of hetero atom on dispersion of NiMo phase on M-SBA-15 (M=Zr, Ti, Ti-Zr)

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

“…If we consider this latter sample, because of its heterogeneity, the sulfidation of Mo is probably underestimated as it does not take into account the slabs located inside the porous network, for which the characteristics should be closer to those of the samples with lower TiO 2 loadings. These values are different from those reported by Chandra Mouli et al [44] who studied the sulfidation of Mo in NiMo catalysts supported on SBA with incorporated Ti ions (5 wt % TiO 2 ) by X-ray absorption spectroscopy (XAS). Mo L3 edge Xray absorption near-edge structure (XANES) analysis showed that the incorporation of Ti into SBA-15 had a beneficial effect on the degree of Mo sulfidation, whereas in our case, a higher degree of sulfidation was obtained for CoMo20/SBA.…”

“…This result confirms that the presence of TiO 2 enables a better dispersion of Mo up to 20 wt % of TiO 2 . An in- [44] the average slab length was calculated to be 4.9 nm compared with 5.5 nm on pure SBA-15.…”

Homogeneous Zr and Ti co-doped SBA-15 with high specific surface area: preparation, characterization and application

“…Although much progress has been made in synthesizing bimetallic Ti-based mesoporous materials, research to Zr support on Ti-SBA-15 materials [15,17,20] has been rare, exemplified by a series of novel multifunctionalized Zr-Ti-SBA-15 ionic liquid filled ordered channels have been synthesized by post-grafting [21], contrasted by findings that the specific surface area of SBA-15 strongly decreases after introduction of titanium and zirconium atoms into its framework. Zr-Ti-SBA-15 synthesized via hydrothermal method has also been reported by K. Chandra Mouli et al [22], by comparing the hydrodenitrogenation (HDN) and hydrodesulphurization (HDS) conversion of Zr-Ti-SBA-15 coming to the conclusion that the increase in HDN conversion is mainly attributable to the incorporation of Zr and Ti in the framework, while the decrease in HDS conversion originates from the poor dispersion of metal on the supports. Therefore, preparing a bimetallic mesoporous material with uniform distribution via a simple method is rational and quite necessary to modify the specific properties of mesoporous material, incorporating heteroatoms into which is through direct synthesis and post synthesis methods, with the former more relatively convenient and controllable than the latter [23].…”

SBA-15 Mesoporous Silica as Catalytic Support for Hydrodesulfurization Catalysts—Review

“…Chandra Mouli et al [ 51 ] prepared NiMo catalysts supported on SBA-15 modified with different heteroatoms (Ti, Zr and Ti + Zr). The catalytic activities were evaluated in the hydrotreating of light gas oil (LGO) carried out in a down flow trickle bed reactor.…”

“…During the last two decades, various mesoporous structures have been synthesized, which can be roughly classified into three categories based on the pore types: nearly spherical cage, cylindrical channel and bi-continuous channel [19]. Among different ordered mesoporous silicas, SBA-type silicas are the most frequently studied [13,14,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,…”