Biodesulfurization of diesel fuels – Past, present and future perspectives

Mohebali, Ghasemali; Ball, Andrew S.

doi:10.1016/j.ibiod.2016.03.011

Cited by 166 publications

(107 citation statements)

References 211 publications

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“…The adsorption mechanisms were studied using different isotherm models, i.e., Langmuir, Freundlich, and Temkin models; their mathematical equations are given as Eqs. (6), (8), and (9), respectively. The isotherm plots are depicted in Figs.…”

Section: Physical Interpretation Of Isotherm Parametersmentioning

confidence: 99%

Desulfurization of Model Oil through Adsorption over Activated Charcoal and Bentonite Clay Composites

et al. 2020

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Adsorption of dibenzothiophene (DBT) from model oil was investigated using composites of pure activated charcoal and pure bentonite clay. DBT adsorption was carried out in batch mode experiments at laboratory scale, where the developed composite materials showed a synergistic effect in removal of DBT from the model oil in terms of improved surface acidity of the pure activated charcoal and mesoporous structure of the pure bentonite clay. Thermodynamics, kinetics, and optimization of various adsorption parameters were investigated. Kinetic analyses proved that DBT adsorption followed pseudo‐second‐order kinetics. To study the thermodynamics of the adsorption, different isotherm adsorption models were applied. The Langmuir isotherm best fitted to the adsorption data. Various thermodynamic parameters were evaluated, including Gibbs free energy, entropy, and enthalpy.

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Section: Physical Interpretation Of Isotherm Parametersmentioning

confidence: 99%

Desulfurization of Model Oil through Adsorption over Activated Charcoal and Bentonite Clay Composites

et al. 2020

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“…S-hererocyclic compounds desulfurizing bacteria are widespread in different environments and geographic locations, suggesting that desulfurization is an important sulfur-scavenging strategy for these bacterial species (Mohebali and Ball, 2016). The metabolic pathways/reactions used for degradation/conversion of aromatic Sheterocyclic compounds can be classified into four different types: i) sulfur oxidation;…”

Section: Biodesulfurization: Microorganisms and Pathwaysmentioning

confidence: 99%

“…The sulfur oxidation of DBT and other S-containing aromatic compounds is catalyzed by some fungal laccases and bacterial ring hydroxylating dioxygenases, mostly from Gram-negative bacteria, that oxidize DBT to DBT-sulfone and other sulfur-containing hydroxylated derivatives as dead-end products ( Fig. 1) (Gupta et al, 2005;Soleimani et al, 2007;Mohebali and Ball, 2016).…”

Section: Biodesulfurization: Microorganisms and Pathwaysmentioning

confidence: 99%

“…(betaproteobacteria), Desulfobacterium (deltaproteobacteria), able to desulfurize DBT, have been also described and some of them have been used in BDS processes (Table 1) (Papizadeh et al, 2011;Gunam et al, 2013;Liu et al, 2015;Bordoloi et al, 2016;Mohebali and Ball, 2016;Dejaloud et al, 2017;Gunam et al, 2017;Papizadeh et al, 2017). Nevertheless, the genetic characterization of the desulfurization gene clusters in these Gram-negative bacteria is still missing.…”

Section: Biodesulfurization: Microorganisms and Pathwaysmentioning

confidence: 99%

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Metabolic and process engineering for biodesulfurization in Gram-negative bacteria

Martínez¹,

Mohamed

Santos

et al. 2017

Journal of Biotechnology

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Microbial desulfurization or biodesulfurization (BDS) is an attractive low-cost and environmentally friendly complementary technology to the hydrotreating chemical process based on the potential of certain bacteria to specifically remove sulfur from S-heterocyclic compounds of crude fuels that are recalcitrant to the chemical treatments. The 4S or Dsz sulfur specific pathway for dibenzothiophene (DBT) and alkyl-substituted DBTs, widely used as model S-heterocyclic compounds, has been extensively studied at the physiological, biochemical and genetic levels mainly in Gram-positive bacteria. Nevertheless, several Gram-negative bacteria have been also used in BDS because they are endowed with some properties, e.g., broad metabolic versatility and easy genetic and genomic manipulation, that make them suitable chassis for systems metabolic engineering strategies. A high number of recombinant bacteria, many of which are Pseudomonas strains, have been constructed to overcome the major bottlenecks of the desulfurization process, i.e., expression of the dsz operon, activity of the Dsz enzymes, retro-inhibition of the Dsz pathway, availability of reducing power, uptake-secretion of substrate and intermediates, tolerance to organic solvents and metals, and other host-specific limitations. However, to attain a BDS process with industrial applicability, it is necessary to apply all the knowledge and advances achieved at the genetic and metabolic levels to the process engineering level, i.e., kinetic modelling, scale-up of biphasic systems, enhancing mass transfer rates, biocatalyst separation, etc. The production of high-added value products derived from the organosulfur material present in oil can be regarded also as an economically viable process that has barely begun to be explored.

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“…Thus, DBT cascading to generate PBS as well as water‐, salt‐ and pH‐dependent products, various HPBS , in one chlorophyll‐biomimetic photocatalysis system has been experimentally demonstrated. It is important note that except the same taking the oxidants, this reaction pathway is very distinguished from well‐known 4S pathway, a catabolizing DBT pathway most scientifically evidenced until now, from basic and key points: 1) C−S cleavage in 4S needs expensive chemical energy like obtained from NADH, while the presence concerned only needs a little light energy; 2) the key intermedaite for C‐S cleavage of 4S is DBTs sulfone, extremely stable compounds resisting most of ractions including the present reaction, while the key intermediate for the present C‐S cleavage reaction is more flexible intermedaite, DBTs sulfoxide; 3) obviously the present procedure from DBT to PBS is one step shorter than the corresponding procedure in 4S (Scheme ), hence the energy needed is reduced further; 4) the active site of DszA, an enzyme catalyst motivate the third step in 4S is flavin‐type, while the present catalysts are porphyrin iron related with chlorophyll wildly and widely existing in cyanobacteria. Extraordinary cyanobacteria, which were found in the petrolum contianminate coast or similar place exposed to the sunlight and in the saltine, which survived from the caustic conditions and evolved the degrading DBT ability .…”

Section: Resultsmentioning

confidence: 96%

Unique Thia‐Baeyer–Villiger‐Type Oxidation of Dibenzothiophene Sulfoxides Derivatives

Shi

Zhou

Yang

et al. 2020

Chemistry An Asian Journal

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The present research has demonstrated that selective C−S bond cleavages of dibenzothiophene and its derivatives are feasible by thia‐Baeyer–Villiger type oxidation, i. e. the oxygen insertion process within a sulfoxide‐carbon linkage, in the presence of porphyrin iron (III) and by ultraviolet irradiation originating from sunlight, high pressure Hg‐lamp or residentially germicidal ultraviolet lamp under very mild conditions. This reaction with tert‐butylhydroperoxide at 30.0 °C leads to dibenzo[1,2]oxathiin‐6‐oxide (PBS) in 83.2 % isolated yield or its hydrated products, 2‐(2‐hydroxyphenyl)‐benzenesulfinic derivatives (HPBS) in near 100 % yield based HPLC data. PBS and HPBS are a type of biological products detected on the C−S bond cleavage step through various oxidative biodesulfurization (OBDS) pathways, and are useful synthetic intermediates and fine chemicals. These observations may contribute on understanding delicately molecular aspect of OBDS in the photosynthesis system, expanding the C‐S cleavage chemistry of S‐heterocyclic compounds and approaching toward biomemic desulfurization with respect to converting sulfur contaminants to chemically beneficial blocks as needed and performing under the ambient conditions.

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Biodesulfurization of diesel fuels – Past, present and future perspectives

Cited by 166 publications

References 211 publications

Desulfurization of Model Oil through Adsorption over Activated Charcoal and Bentonite Clay Composites

Desulfurization of Model Oil through Adsorption over Activated Charcoal and Bentonite Clay Composites

Metabolic and process engineering for biodesulfurization in Gram-negative bacteria

Unique Thia‐Baeyer–Villiger‐Type Oxidation of Dibenzothiophene Sulfoxides Derivatives

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