Influence of petroleum nitrogen compounds on hydrodesulphurization

Kaernbach, Winfried; Kisielow, Włodzimierz; Warzecha, L.; Miga, K.; Klecan, Roman

doi:10.1016/0016-2361(90)90178-s

Cited by 20 publications

(16 citation statements)

References 6 publications

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“…Methane and ethane were the major [37,38], which could contribute to the catalyst deactivation during the heavy oil hydrocracking process, does not exist in the model reactant system. Therefore, hydrogen free radical was provided during the whole reaction process and the formation of isomerization products was suppressed sharply.…”

Section: Hydrocracking Of Model Reactantmentioning

confidence: 99%

Slurry-phase hydrocracking of heavy oil and model reactant: effect of dispersed Mo catalyst

Ren

et al. 2015

Appl Petrochem Res

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Thermal hydrocracking and catalytic hydrocracking of heavy oil and model reactant have been carried out to investigate the effect of dispersed Mo catalyst on slurry-phase hydrocracking. The XRD and XPS patterns suggested that the major existence form of dispersed Mo catalyst in slurry-phase hydrocracking was MoS 2 . Experimental data revealed that the conversion of feedstock oils and model reactant increased with the presence of catalyst, while the yields of light products (gas, naphtha) and heavy products (vacuum residue, coke) decreased, the yields of diesel and vacuum gas oil increased in the meantime. Besides, the yields of aromatic hydrocarbon and naphthenic hydrocarbon in naphtha fraction decreased. Effect parameters R G (the ratio of i-C 4 H 10 yield to n-C 4 H 10 yield) and isoparaffin/n-paraffin ratio were proposed to study the reaction mechanism of slurry-phase hydrocracking, the smaller effect parameters showed that there was no carbonium ion mechanism in slurry-phase hydrocracking, which still followed the free radical mechanism, and that the isomerization ratio of products decreased with the presence of Mo catalyst.

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Section: Hydrocracking Of Model Reactantmentioning

confidence: 99%

Slurry-phase hydrocracking of heavy oil and model reactant: effect of dispersed Mo catalyst

Ren

et al. 2015

Appl Petrochem Res

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“…The composite of Tris-LDH-LaW10 was synthesized according to our previous work 44 and fully characterized by XRD, FT-IR, 13 C NMR, XPS, TGA, BET, HRTEM and EDX (see supporting information).…”

Section: Resultsmentioning

confidence: 99%

“…[6][7][8][9] In addition to high operating costs, there are two main drawbacks associated with the hydro-treating process: 1) HDS and HDN are less effective for the removal of heterocyclic sulfur or nitrogen compounds such as thiophene (TPH), benzothiophene (BT), dibenzothiophene (DBT), pyridine, quinoline and indole, which are abundant in diesel fuels; 10,11 2) most importantly, low content (~100 ppm) nitrogen-containing compounds present in fuels can compete with sulfur compounds for the catalytic active sites of Co−Mo or Ni−Mo catalysts, since HDN is a kinetically slower reaction, which finally suppresses significantly the deep desulfurization process. [12][13][14] Hence, it is crucial to develop environmentally greener and economically viable solutions for the removal of sulfur and nitrogen content from complex reaction mixtures e.g. during fuel production.…”

Section: Introductionmentioning

confidence: 99%

Efficient concurrent removal of sulfur and nitrogen contents from complex oil mixtures by using polyoxometalate-based composite materials

Yao

Miras

Song

2016

Inorg. Chem. Front.

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The increasingly stringent regulations in relation to the environmental impact of employed industrial processes makes compulsory the development of alternative routes towards the reduction of the sulfur and nitrogen content in large scale chemical mixtures. Herein, we demonstrate for the first time the highly efficient application of polyoxometalate (POMs)/layered double hydroxide (LDHs) composite in deep desulfurization (1000 ppm) and denitrogenation (100 ppm) of complex model oil system under mild conditions (65 o C), with a corresponding decrease of the content to less than 10 and 1 ppm, respectively. The high efficiency of the heterogeneous catalyst along with the high stability and easy recovery of the catalytic system renders them promising candidates for greener catalytic applications.

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“…In addition to sulfur compounds, diesel oil, gasoline and jet fuel contain many nitrogen-containing compounds [49]; the combustion of these substances will release large amounts of nitrogen oxides, leading to the formation of acid rain with serious environmental consequences [50]. Although the concentration of nitrogen-containing compounds in fuel oils is relatively low, the competition with sulfur-containing components for the active sites of the catalysts [51,52], can lead to the inhibition of the deep desulfurization process. Therefore, deep desulfurization and denitrogenation is of great significance for the development of clean oil products, and is a challenging task.…”

Section: Oxidation Catalystmentioning

confidence: 99%

“…Although the concentration of nitrogen-containing compounds in fuel oils is relatively low, the competition with sulfur-containing components for the active sites of the catalysts [51,52], can lead to the inhibition of the deep desulfurization process. Therefore, deep desulfurization and denitrogenation is of great significance for the development of clean oil products, and is a challenging task.…”

Section: Oxidation Catalystmentioning

confidence: 99%

Polyoxometalate (POM)-Layered Double Hydroxides (LDH) Composite Materials: Design and Catalytic Applications

Miras

Song

2017

Catalysts

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Layered double hydroxides (LDHs) are an important large class of two-dimensional (2D) anionic lamellar materials that possess flexible modular structure, facile exchangeability of inter-lamellar guest anions and uniform distribution of metal cations in the layer. Owing to the modular accessible gallery and unique inter-lamellar chemical environment, polyoxometalates (POMs) intercalated with LDHs has shown a vast array of physical properties with applications in environment, energy, catalysis, etc. Here we describe how polyoxometalate clusters can be used as building components for the construction of systems with important catalytic properties. This review article mainly focuses on the discussion of new synthetic approaches developed recently that allow the incorporation of the element of design in the construction of a fundamentally new class of materials with pre-defined functionalities in catalytic applications. Introducing the element of design and taking control over the finally observed functionality we demonstrate the unique opportunity for engineering materials with modular properties for specific catalytic applications.Keywords: layered double hydroxides; polyoxometalates; intercalated materials Layered Double Hydroxides (LDHs)-Intro BackgroundLayered double hydroxides (LDHs) or hydrotalcite-like compounds are a large family of two-dimensional (2D) anionic clay materials made up of positively charged brucite-like layers with an interlayer region containing charge compensating anions and solvation molecules, which can be represented by the general formula -4]. As shown in Figure 1 and generally in the range of 0.20-0.33, which occupy the space between the layers compensating for the positive charge and inducing stability in the overall structure [5,6]. The M II /M III -based edge shared octahedra are used to construct 2D infinite sheets, whereas hydroxyl groups are organized on the vertices of the octahedra with the hydrogen atoms pointing toward the interlayer region, as a consequence forming a complex network of hydrogen bonds with the interlayer anions and water molecules [1,[7][8][9][10]. LDH-based materials are very attractive systems due to their robust structure,

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Influence of petroleum nitrogen compounds on hydrodesulphurization

Cited by 20 publications

References 6 publications

Slurry-phase hydrocracking of heavy oil and model reactant: effect of dispersed Mo catalyst

Slurry-phase hydrocracking of heavy oil and model reactant: effect of dispersed Mo catalyst

Efficient concurrent removal of sulfur and nitrogen contents from complex oil mixtures by using polyoxometalate-based composite materials

Polyoxometalate (POM)-Layered Double Hydroxides (LDH) Composite Materials: Design and Catalytic Applications

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