Preparation of Ni-Mo 2 C/carbon catalysts and their stability in the HDS of dibenzothiophene

Wang, Haiyan; Liu, Shida; Govindarajan, Rubenthran; Smith, Kevin J.

doi:10.1016/j.apcata.2017.04.008

Cited by 20 publications

(19 citation statements)

References 42 publications

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“…Analysis of the S 2s and 2p 3/2 spectra (Figure and Table ) for both NiMoS/AC and the NiMoS/APC catalysts also showed the presence of similar chemical species (MoS 2 , MoO x S y , and SO x , Table ). The BEs are in agreement with values reported in the literature …”

Section: Resultssupporting

confidence: 91%

Hydrodesulphurization of dibenzothiophene on NiMoS catalysts: Impact of the carbon support on the reaction kinetics

Alamoudi¹,

Smith²

2019

Can J Chem Eng

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The hydrodesulphurization (HDS) activity of nickel molybdenum sulphided catalysts supported on activated carbon (NiMoS/AC), activated petroleum coke (NiMoS/APC), and conventional alumina (NiMo/g-Al 2 O 3 ) have been compared using dibenzothiophene (DBT) as a model reactant.The reactions were carried out in a slurry-phase batch microreactor at different reaction times (30-120 min) and temperatures (588-638 K) and a fixed H 2 pressure (4.8 MPa). The NiMoS/APC catalyst had higher dispersion than the NiMoS/AC catalyst, resulting in a higher DBT conversion activity per gram of catalyst on the NiMoS/APC catalyst. However, similar activities were obtained on both catalysts when accounting for the NiMoS dispersion. The NiMoS/APC activity was marginally lower than the NiMoS/g-Al 2 O 3 commercial catalyst, suggesting that activated petcoke is a promising support for NiMoS catalysts. The pseudo 1 st order rate constants for both the direct desulphurization (DDS) and hydrogenation (HYD) reaction pathways were of similar magnitude on the NiMoS/APC catalyst, as were the apparent activation energies. Hence the selectivities for HYD versus DDS were favoured equally on the NiMoS/APC, unlike on NiMoS/Al 2 O 3 where the DDS of DBT is favoured, or the NiMoS/AC where the DDS of DBT is favoured at higher temperatures (> 603 K). The results of this study demonstrate that raw petcoke derived from Canadian oilsands can be converted to a useful catalyst support for hydrotreating catalysts that have high NiMoS dispersion and HDS activity, comparable to that of a commercial NiMoS/Al 2 O 3 catalyst.

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Section: Resultssupporting

confidence: 91%

Hydrodesulphurization of dibenzothiophene on NiMoS catalysts: Impact of the carbon support on the reaction kinetics

Alamoudi¹,

Smith²

2019

Can J Chem Eng

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“…Carbon-supported molybdenum carbides have been used in a number of reactions, such as HDO of bio-oils model compounds [22][23][24][25][26][27][28][29] and vegetable oils [23,24,[30][31][32][33], dehydrogenation of methylcyclohexane [18], hydrodesulphurization of dibenzothiophene [33], hydrodenitrogenation of indole [34], deoxygenation or hydrogenation of guaiacol [28,35], lignin ethanolysis [36], H 2 production by hydrazine [37] or ethanol decomposition [38], steam reforming of methanol [21,39] and as electrocatalyst in hydrogen evolution reactions [32,40].…”

Section: Introductionmentioning

confidence: 99%

Carbon nanofiber supported Mo2C catalysts for hydrodeoxygenation of guaiacol: The importance of the carburization process

Ochoa

Torres

Moreira

et al. 2018

Applied Catalysis B: Environmental

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Molybdenum carbide catalysts supported on carbon nanofibers (β-Mo 2 C/CNF) were synthetized employing different carburization parameters: five temperatures (550-750 ºC) and four heating rates (1-10 ºC/min) were tested. The carburization process of the Mo precursor in the catalysts was studied by thermogravimetric analysis, X-ray diffraction, X-ray photoelectron spectroscopy, N 2 physisorption, inductively coupled plasma optical emission spectrometry and transmission electron microscopy. The formation of the carbide phase was confirmed by the presence of the oxycarbide and carbide phases which were observed on the surface of all catalysts. Higher carburization temperatures resulted in an increase of the carbide phase content and crystal size at the expenses of the oxycarbide phase disappearance. High carburization temperatures and low heating rates were needed in order to obtain well-defined β-Mo 2 C crystals over the

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“…In addition, when Mo 2 C is prepared by CHR using carbon materials as a support, the formation of coke on the surface of the catalysts, typically associated with the use of hydrocarbons in the carburization step, is avoided [28]. Normally, Mo 2 C supported in metal oxides (TiO 2 , ZrO 2 , CeO 2 , SiO 2 or Al 2 O 3 ) prepared by temperature programmed reduction with hydrocarbons shows deactivation problems due to coke deposition, resulting in a low specific surface area and low stability, and thus low catalytic activity [14].…”

Section: Of 19mentioning

confidence: 99%

“…Since the development in 1985 by Boudart et al of high specific surface area carbides and nitrides by temperature-programmed reduction [1], several authors have synthetised Mo 2 C catalysts by this method using hydrocarbon/hydrogen mixtures [2][3][4][5][6][7][8]. Alternatively, for carbon-supported Mo 2 C catalysts, the carbothermal hydrogen reduction (CHR) method may transform Mo oxides into hexagonal-close-packed carbides (β-Mo 2 C) at relatively moderate temperatures (<800 • C) using pure hydrogen [9][10][11][12][13][14]. CHR has attracted scientific attention due to the fact that it might avoid carbide contamination by polymeric carbon deposition on the active sites when hydrocarbons are used as a carbon source [15].…”

Section: Introductionmentioning

confidence: 99%

“…Besides, the use of milder temperature conditions may mitigate the low specific surface area obtained due to the partial destruction of the support [16]. Nevertheless, several parameters are involved in the resulting crystallographic and morphological characteristics of the Mo 2 C phase, such as carburization temperature, heating rate, carburization time, Mo precursor, Mo content and the nature of the carbon support [11,12,14,[17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Nanostructured Carbon Material Effect on the Synthesis of Carbon-Supported Molybdenum Carbide Catalysts for Guaiacol Hydrodeoxygenation

et al. 2020

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The impact of using different nanostructured carbon materials (carbon nanofibers, carbon nanotubes, graphene oxide and activated carbon) as a support for Mo2C-based catalysts on the hydrodeoxygenation (HDO) of guaiacol was studied. To optimise the catalyst preparation by carbothermal hydrogen reduction (CHR), a thermogravimetric study was conducted to select the optimum CHR temperature for each carbon material, considering both the crystal size of the resulting β-Mo2C particles and the extent of the support gasification. Subsequently, catalysts were prepared in a fixed bed reactor at the optimum temperature. Catalyst characterization evidenced the differences in the catalyst morphology as compared to those prepared in the thermogravimetric study. The HDO results demonstrated that the carbon nanofiber-based catalyst was the one with the best catalytic performance. This behaviour was attributed to the high thermal stability of this support, which prevented its gasification and promoted a good evolution of the crystal size of Mo species. This catalyst exhibited well-dispersed β-Mo2C nanoparticles of ca. 11 nm. On the contrary, the other supports suffered from severe gasification (60–70% wt. loss), which resulted in poorer HDO efficiency catalysts regardless of the β-Mo2C crystal size. This exhibited the importance of the carbon support stability in Mo2C-based catalysts prepared by CHR.

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Preparation of Ni-Mo 2 C/carbon catalysts and their stability in the HDS of dibenzothiophene

Cited by 20 publications

References 42 publications

Hydrodesulphurization of dibenzothiophene on NiMoS catalysts: Impact of the carbon support on the reaction kinetics

Hydrodesulphurization of dibenzothiophene on NiMoS catalysts: Impact of the carbon support on the reaction kinetics

Carbon nanofiber supported Mo2C catalysts for hydrodeoxygenation of guaiacol: The importance of the carburization process

Nanostructured Carbon Material Effect on the Synthesis of Carbon-Supported Molybdenum Carbide Catalysts for Guaiacol Hydrodeoxygenation

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