Review of Experimental Characterization of Active Sites and Determination of Molecular Mechanisms of Adsorption, Desorption and Regeneration of the Deep and Ultradeep Desulfurization Sorbents for Liquid Fuels

Samokhvalov, Alexander; Tatarchuk, Bruce J.

doi:10.1080/01614940.2010.498749

Cited by 120 publications

(82 citation statements)

References 87 publications

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“…[18] In this paper, readily available, cost-effective LDH-derived MMOs are investigated which have been shown to be effective adsorbents due to their basic character that generates acidbase Lewis interactions with the organic molecules. [26] In addition, MMOs show promising features for adsorption due to their regenerability and adjustable elemental composition. [18] In this study, MgAl-LDH, a cost effective and well-studied LDH compound, was loaded with small weight fractions of GO, followed by thermal conversion into MgAl-MMO/GO hybrids.…”

Section: Introductionmentioning

confidence: 99%

Graphene oxide/mixed metal oxide hybrid materials for enhanced adsorption desulfurization of liquid hydrocarbon fuels

Menzel

Iruretagoyena

Wang

et al. 2016

Fuel

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HIGHLIGHTS The adsorption of sulfur from liquid hydrocarbons using mixed metal oxides unsupported and supported on graphene oxide was studied for the first time  Sulfur adsorption capacity and thermal stability of mixed metal oxides is enhanced by the presence of graphene oxide  The GO supported adsorbents show good selectivity for organosulfur compounds over sulfur-free aromatic hydrocarbons KEYWORDSGraphene oxide, mixed metal oxide, dibenzothiophene, adsorption, desulfurization ABSTRACTA series of mixed metal oxides (MMOs) adsorbents (MgAl-, CuAl-and CoAl-MMOs) were supported on graphene oxide (GO) through in-situ precipitation of layered double hydroxides (LDHs) onto exfoliated GO, followed by thermal conversion. The study shows that GO is an excellent support for the LDH-derived MMOs due to matching geometry and charge complementarity, resulting in a strong hybrid effect, evidenced by significantly enhanced adsorption performance for the commercially important removal of heavy thiophenic compounds from hydrocarbons. Fundamental liquid-phase adsorption characteristics of the MMO/GO hybrids are quantified in terms of adsorption equilibrium isotherms, selectivity and adsorbent regenerability. Upon incorporation of as little as 5wt% GO into the MMO material, the organosulfur uptake was increased by up to 170%, the recycling stability was markedly improved and pronounced selectivity for thiophenic organosulfurs over sulfur-free aromatic hydrocarbons was observed.2

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Section: Introductionmentioning

confidence: 99%

Graphene oxide/mixed metal oxide hybrid materials for enhanced adsorption desulfurization of liquid hydrocarbon fuels

Menzel

Iruretagoyena

Wang

et al. 2016

Fuel

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“…38 Carbonaceous materials (activated carbon, carbon aerogels or carbon nanotubes), 39, 40 metal or metal oxides, 40 zeolites, 40 clays, [41][42][43] silicas, 44 organic polymers 40 or metal coordination polymers 31,45 have been used among others as adsorbents. In addition, molecular imprinting technology has also been applied for the selective desulfurization of oils.…”

Section: Introductionmentioning

confidence: 99%

MIL-101 promotes the efficient aerobic oxidative desulfurization of dibenzothiophenes

et al. 2016

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MIL-101 promotes the aerobic oxidation in n-dodecane of dibenzothiophene (DBT) and its methyl-substituted derivatives to their corresponding sulfone with complete selectivity, without observation of the sulfoxide. DBT sulfones can be completely separated from n-dodecane by water extraction. MIL-101(Cr) without the need of pre-activation was found more convenient than the also-active MIL-101(Fe) analog. The reaction exhibits an induction period due to the diffusion inside the pore system of the solvent or oxygen and it is not observed if the MIL-101 sample is first contacted with the solvent at the reaction temperature for sufficiently long times. MIL-101 is reusable for at least five times without any sign of deactivation according to the time-conversion plots. Evidence by electron paramagnetic resonance spectroscopy detecting the hydroperoxide radical adduct with a spin trapping agent and Raman spectroscopy detection of superoxide supports that the process is an autooxidation reaction initiated by MIL-101 following the expected radical chain mechanism inside the MIL-101 cages.

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“…FCs utilize hydrogen produced from liquid fuels either by reforming or by consuming liquid hydrocarbon fuels directly. [31] In either case, sulfur compounds damage the electrodes of FCs and fuel-reforming catalysts, and thus, need to be removed from liquid [32] and gaseous [33] fuels intended for FC applications. The sulfur content of ULS gasoline and ULSD in the USA (30 and 15 ppmw, respectively) is too high for FC applications, which require ultradeep desulfurization to less than 1 ppm or even < 60 ppb total sulfur.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Photocatalytic Reactions of Sulfur Aromatic Compounds

Samokhvalov¹

2011

ChemPhysChem

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Sulfur aromatic compounds, such as mono-, di-, tri-, and tetraalkyl-substituted thiophene, benzothiophenes, dibenzothiophenes, are the molecular components of many fossils (petroleum, oil shale, tar sands, bitumen). Structural units of natural, cross-linked heteroaromatic polymers present in brown coals, turf, and soil are similar to those of sulfur aromatic compounds. Many sulfur aromatic compounds are found in the streams of petroleum refining and upgrading (naphthas, gas oils) and in the consumer products (gasoline, diesel, jet fuels, heating fuels). Besides fossils, the structural fragments of sulfur aromatic compounds are present in molecules of certain organic semiconductors, pesticides, small molecule drugs, and in certain biomolecules present in human body (pheomelanin pigments). Photocatalysis is the frontier area of physical chemistry that studies chemical reactions initiated by absorption of photons by photocatalysts, that is, upon electronic rather than thermal activation, under "green" ambient conditions. This review provides systematization and critical review of the fundamental chemical and physicochemical information on heterogeneous photocatalysis of sulfur aromatic compounds accumulated in the last 20-30 years. Specifically, the following topics are covered: physicochemical properties of sulfur aromatic compounds, major classes of heterogeneous photocatalysts, mechanisms and reactive intermediates of photocatalytic reactions of sulfur aromatic compounds, and the selectivity of these reactions. Quantum chemical calculations of properties and structures of sulfur aromatic compounds, their reactive intermediates, and the structure of adsorption complexes formed on the surface of the photocatalysts are also discussed.

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Review of Experimental Characterization of Active Sites and Determination of Molecular Mechanisms of Adsorption, Desorption and Regeneration of the Deep and Ultradeep Desulfurization Sorbents for Liquid Fuels

Cited by 120 publications

References 87 publications

Graphene oxide/mixed metal oxide hybrid materials for enhanced adsorption desulfurization of liquid hydrocarbon fuels

Graphene oxide/mixed metal oxide hybrid materials for enhanced adsorption desulfurization of liquid hydrocarbon fuels

MIL-101 promotes the efficient aerobic oxidative desulfurization of dibenzothiophenes

Heterogeneous Photocatalytic Reactions of Sulfur Aromatic Compounds

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