Supported silver adsorbents for selective removal of sulfur species from hydrocarbon fuels

Nair, Sachin; Tatarchuk, Bruce J.

doi:10.1016/j.fuel.2010.05.006

Cited by 58 publications

(59 citation statements)

References 52 publications

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“…This phenomenon has been observed with other silver loaded materials, where Tatarchuk and coworkers found that as silver loading increased beyond 4 wt.%, the surface area, pore volume, and silver dispersion decreased [24]. As a result, they observed lower adsorption capacities for materials loaded with more silver [24]. For DDA-15 the optimized silver loading was found to be 11 wt.% and was subsequently used for all model and JP-8 fuel tests herein for the entire series of materials.…”

Section: Model Fuel Testingsupporting

confidence: 68%

“…Silver aggregates likely start to form at higher silver concentration, which can block the channels and result in a lower adsorption capacity. This phenomenon has been observed with other silver loaded materials, where Tatarchuk and coworkers found that as silver loading increased beyond 4 wt.%, the surface area, pore volume, and silver dispersion decreased [24]. As a result, they observed lower adsorption capacities for materials loaded with more silver [24].…”

Section: Model Fuel Testingsupporting

confidence: 68%

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Zirconia-silica based mesoporous desulfurization adsorbents

Palomino

Tran

Kareh

et al. 2015

Journal of Power Sources

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h i g h l i g h t sMesoporous silicate sorbent materials templated by long-chain primary alkylamine. Excellent saturation adsorption capacity (39.4 mgS/g) and silver efficiency (1.21 molS/molAg). 86% of initial capacity towards model fuel maintained after solvent regeneration. t r a c tWe report a series of mesoporous silicate sorbent materials templated by long-chain primary alkylamines that display record level of desulfurization of the jet fuel JP-8. Pure silica frameworks and those with a Si:Zr synthesis molar ratio ranging from 44:1 to 11:1 were investigated. The optimum sorbent was identified as dodecylamine-templated silica-zirconia synthesized from a gel with Si:Zr molar ratio of 15:1. With an optimized silver loading of 11 wt.%, a saturation adsorption capacity of 39.4 mgS g À1 and a silver efficiency of 1.21 molS mol Ag À1 were observed for JP-8. This sorbent displayed exceptional regenerability, maintaining 86% of its initial capacity in model fuel after solvent regeneration with diethyl ether. Low-cost, portable and reusable sorbents for the desulfurization of JP-8 jet fuel are needed to make solid oxide fuel cells (SOFCs) a reality for military power needs. SOFCs require ultra-low sulfur content fuel, which traditional desulfurization methods cannot achieve.

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Section: Model Fuel Testingsupporting

confidence: 68%

Section: Model Fuel Testingsupporting

confidence: 68%

Zirconia-silica based mesoporous desulfurization adsorbents

Palomino

Tran

Kareh

et al. 2015

Journal of Power Sources

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“…6 Breakthrough of sulfur in JP5 (1172 pppmw) compared to that of benzothiophene (3500 ppmw) in octane using the Ag(4wt%)/TiO 2 while Selexorb CDX demonstrated negligible capacity. Among the tested adsorbents, Ag(4wt%)/TiO 2 maybe preferred due to the simple synthesis procedure, absence of activation steps and more importantly facile thermal regenerability using air as a stripping medium (Nair and Tatarchuk 2010;Tatarchuk et al 2008). Loss in sulfur capacity of various adsorbents has been reported while using real fuels as challenge.…”

Section: Performance Comparisonsmentioning

confidence: 99%

“…Recently we developed Ag/TiO 2 adsorbents that demonstrated high capacity for sulfur aromatics in fuels at ambient conditions (Nair and Tatarchuk 2010;Tatarchuk et al 2008). The adsorbent was thermally regenerable in air over multiple cycles demonstrating a consistent sulfur capacity of 8.5 mg/g over 10 adsorption/regeneration cycles for JP5 fuel (∼1200 ppmw sulfur).…”

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confidence: 99%

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Characteristics of sulfur removal by silver-titania adsorbents at ambient conditions

Nair

Tatarchuk

2011

Adsorption

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Sulfur capacity of SiO 2 , TiO 2 and γ -Al 2 O 3 structures was investigated. Thermal treatment of TiO 2 and γ -Al 2 O 3 in air increased their respective sulfur capacity by 67 and 43%. Sulfur capacity was associated with surface acidity and the improvement attributed to the formation of bronsted acid sites. Addition of 4wt% transition metals further enhanced the sulfur capacity of TiO 2 with Ag indicating the highest increase. Comparison of sulfur capacity of Ag/TiO 2 with other adsorbents was made using JP5 fuel with sulfur concentration of 1172 ppmw. Ag/TiO 2 adsorbent demonstrated a saturation sulfur capacity of 8.20 mg/g. A significant loss in sulfur capacity was observed between real and model fuel compositions. Various factors resulting in this loss was investigated such as the effect of additives, competitive adsorption and the structure of sulfur heterocycles.

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