Effect of Ti loading on the HDS and HDN activity of KLGO on NiMo/TiSBA-15 catalysts

Soni, Kapil; Mouli, K. Chandra; Dalai, Ajay K.; Adjaye, John

doi:10.1016/j.micromeso.2011.11.027

Cited by 40 publications

(25 citation statements)

References 49 publications

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“…The US Environmental Protection Agency recently issued a final rule requiring refineries to cut sulfur levels in gasoline from 30 ppm to 10 ppm by Jan. 2017 [3]. Current topics of study include investigation of the nitrogen tolerance [4], trimetallic compositions [5], the addition of additives like P and B [6] and Ga [7], the use of egg-shell or hierarchical supports [8], the use of composite supports [9,10], the use of zeolites [11], the use of mesoporous supports [12,13], oxidative desulfurization [14], and noble metals [15]. Metal phosphides have recently received extensive attention as a new type of hydrodesulfurization (HDS) catalyst because of their high activity and stability in the HDS and hydrodenitrogenation (HDN) of model and real feeds [8,[16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Nature of active sites in Ni2P hydrotreating catalysts as probed by iron substitution

Zhao

Oyama

Freund

et al. 2015

Applied Catalysis B: Environmental

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A series of NiFeP/SiO 2 catalysts with different Ni:Fe molar ratios (1:0, 3:1, 1:1, 1:3, 0:1) was investigated for the hydrodesulfurization (HDS) of 4,6-dimethyldibenzothiophene.The Fe component is a good probe for active sites because Ni 2 P and Fe 2 P adopt the same hexagonal crystal structure, yet Fe 2 P is completely inactive for HDS. X-ray diffraction analysis and FTIR spectroscopy of adsorbed CO indicated the formation homologous alloys. At 3.1 MPa and 613 K (340 o C) the activity of the alloys was similar to that of Ni 2 P, which was very high. There was also unprecedented selectivity towards direct desulfurization (DDS). A reconstruction of the NiFe phase occurred to expose more Ni sites, likely driven by the formation of surface Ni-S bonds as observed by EXAFS. The analysis showed that Ni(2) pyramidal sites responsible for hydrogenation were largely replaced by Fe. This left behind Ni(1) tetrahedral sites which favor DDS and explains the reactivity results.

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Section: Introductionmentioning

confidence: 99%

Nature of active sites in Ni2P hydrotreating catalysts as probed by iron substitution

Zhao

Oyama

Freund

et al. 2015

Applied Catalysis B: Environmental

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“…Furthermore, the incorporation of Ti within the SBA structure was attempted by several groups, with Si/Ti ratios between 80 and 20. [34][35][36][37] However, the incorporated amounts were quite low, and the highest incorporated TiO 2 content was 6.2 wt % (Si/Ti = 20). The Ti-containing supports appeared to be more active than their Ti-free counterparts in thiophene HDS, [34] dibenzothiophene (DBT) HDS [35,36] and biphenyl hydrogenation.…”

Section: Introductionmentioning

confidence: 99%

“…[34][35][36][37] However, the incorporated amounts were quite low, and the highest incorporated TiO 2 content was 6.2 wt % (Si/Ti = 20). The Ti-containing supports appeared to be more active than their Ti-free counterparts in thiophene HDS, [34] dibenzothiophene (DBT) HDS [35,36] and biphenyl hydrogenation. [37] The authors attributed these improved performances to an increase in the metal-support in-Solids composed of TiO 2 nano-crystallites (10-40 wt %) dispersed in an SBA-15 matrix were synthesised and used as hydrodesulfurisation (HDS) active-phase supports.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2013

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International audienceSolids composed of TiO2 nano-crystallites (10-40wt%) dispersed in an SBA-15 matrix were synthesised and used as hydrodesulfurisation (HDS) active-phase supports. Well-dispersed polymolybdate species were detected by Raman spectroscopy on all the CoMo-based oxidic precursors. Undesirable bulk CoMoO4 mixed oxide was also detected on the surface of low-TiO2-content materials, which suggests the enhancement of the Mo oxidic species dispersion as a result of the presence of TiO2. After activation under H-2/H2S, the obtained catalysts were tested in the HDS of thiophene. An optimum conversion was observed for the catalyst supported on the solid that contained 20wt% TiO2, which outperformed the homologous samples supported on TiO2 and SBA-15. This clearly highlights the beneficial effect of using such nano-TiO2-SBA-15 composite supports, in which SBA-15 confers adequate textural properties to the system, and the active phase benefits from the dispersive effect of TiO2

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“…In the preparation process of carrier, pore structure should be primarily design and topology analysis in order to balance the specific surface area and diffusion resistance (mainly determined by pores diameter) [11,40,54,55]. Generally speaking, the relation between pore diameter and specific surface area is mutually restrictive.…”

Section: Carriersmentioning

confidence: 99%

“…At present, the commonly used modification method of those disadvantages is to introduce Al [28,37,55], Ti [54], Zr [56], W [45], etc. into the carrier's frame.…”

Section: Carriersmentioning

confidence: 99%

Advancement of Hydro-Desulfurization Catalyst and Discussion of Its Application in Coal Tar

Liu¹,

Zhang²,

Jiang³

et al. 2013

ACES

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This paper describes the influences of active metal, promoter and chelating agent on the properties of hydro-desulfurization catalyst. The use of chelating agent, especially its combination with common promoters e.g., EDTA-P, has an important meaning to develop highly active catalyst, specifically to unify the active metal dispersion degree and sulfurization degree in some extent, however, they are contradictory in conventional cognition. In the aspect of carriers, composition and nanometer carriers have more excellent performances in acidity, pores structure and metal-carrier interaction than common carriers, and are the developing trend in the future and should be a breakthrough mainly in preparation methods. We also pointed out the decisive factors to improve the activity of the catalyst: higher sulfurization degree of active metal oxide and higher aspect ratios of active phase crystal morphology, and the proper acidity and pores structure can be considered the key factors for deep desulfurization whose mainly obstacle is the desulfurization of large rigid molecules, e.g., dibenzothiophene and 4, 6-dimethyl substituted dibenzothiophene. Based on above that, We discussed the suitable hydrodesulfurization (HDS) catalyst for coal tar, aiming at providing some theoretical guidance for the "design" of coal tar HDS catalyst.

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Effect of Ti loading on the HDS and HDN activity of KLGO on NiMo/TiSBA-15 catalysts

Cited by 40 publications

References 49 publications

Nature of active sites in Ni2P hydrotreating catalysts as probed by iron substitution

Nature of active sites in Ni2P hydrotreating catalysts as probed by iron substitution

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

Advancement of Hydro-Desulfurization Catalyst and Discussion of Its Application in Coal Tar

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