Effect of NiMo phases on the hydrodesulfurization activities of dibenzothiophene

Liu, Huan; Yin, Changlong; Li, Xuehui; Chai, Yong‐Ming; Li, Yanpeng; Liu, Chenguang

doi:10.1016/j.cattod.2016.08.002

Cited by 45 publications

(29 citation statements)

References 27 publications

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“…Most of the studies on the synthesis of Ni-promoted MoS 2 catalysts concern the synthesis of oxides which are further sulfided just before the catalytic evaluations. In those cases, the specific surface area of the oxide phases could be increased by the use of PVP up to 144 m 2 •g −1 as reported by Liu [22]. But very small specific surface areas were obtained for the final NiMoS catalysts: less than 20 m 2 •g −1 .…”

Section: Catalysts Characterizationsmentioning

confidence: 59%

“…Interestingly, the addition of organic compounds during the synthesis of Ni (or Co)-promoted MoS 2 catalysts has been less studied. Some papers report the synthesis, usually in hydrothermal conditions, of molybdenum oxide phases promoted by Ni, in the presence of polymers such as PVP [21,22] or PEG [23] but a further sulfidation step was required. In these studies, the presence of nickel sulfide phases has been observed in addition to the mixed Ni-Mo-S phase.…”

Section: Of 17mentioning

confidence: 99%

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Influence of Pluronic® P123 Addition in the Synthesis of Bulk Ni Promoted MoS2 Catalyst. Application to the Selective Hydrodesulfurization of Sulfur Model Molecules Representative of FCC Gasoline

et al. 2019

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A way to improve hydrotreatment processes is to enhance the intrinsic activity of Ni or Co promoted MoS2 catalysts that are commonly used in such reactions. The aim of this work was to investigate the impact of the presence of Pluronic® P123 as a structuring agent during the synthesis of Ni promoted MoS2 catalysts (named NiMoS) in water at room temperature. A series of analyses, i.e., X-ray diffraction (XRD), chemical analysis, inductively coupled plasma mass spectrometry (ICP-MS), nitrogen adsorption-desorption isotherms, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS), helped in characterizing the NiMoS-P123 and NiMoS catalysts, the latter being prepared in the absence of polymer. Both compounds contained MoS2 phase (~85 atomic% considering Mo atoms), a similar amount of mixed Ni-Mo-S phase (40–50% considering Ni) and some amount of NiS and Ni-oxidized impurity phases. The main differences between the two catalysts were a much larger specific surface area (126 m2·g−1 instead of 31 m²·g−1) and a better dispersion of the active phase as shown by the lower slab stacking (2.7 instead of 4.8) for NiMoS-P123, and the presence of C in NiMoS-P123 (9.4 wt.% instead of 0.6 wt.%), indicating an incomplete decomposition of the polymer during thermal treatment. Thanks to its larger specific surface area and lower slab stacking and therefore modification of active Mo site properties, the compound prepared in the presence of Pluronic® P123 exhibits a strong increase of the catalytic activity expressed per Mo atom for the transformation of 3-methylthiophene. Such improvement in catalytic activity was not observed for the transformation of benzothiophene likely due to poisonous residual carbon which results from the presence of Pluronic® P123 during the synthesis.

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Section: Catalysts Characterizationsmentioning

confidence: 59%

Section: Of 17mentioning

confidence: 99%

Influence of Pluronic® P123 Addition in the Synthesis of Bulk Ni Promoted MoS2 Catalyst. Application to the Selective Hydrodesulfurization of Sulfur Model Molecules Representative of FCC Gasoline

et al. 2019

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“…Another method for achieving high surface areas and improve the dispersion is the use of organic templates. This section deals with the hydrodesulfurization activity of the catalysts synthesized using various organic templates such as polyethylene glycol [157][158][159][160], polivinylpyrrolidone (PVP) [161], pluronic 123 (P123) [162], tetrabutylammonium bromide [163], or biotemplates [164]. The use of templates could improve morphology, thermal stability, and the formation of active NiMoS/CoMoS phases [157].…”

Section: Template Methodsmentioning

confidence: 99%

“…The morphology and active phases depend on the content of the surfactant used in catalyst synthesis. Liu et al [161] reported that β-NiMoO 4 phase is preferred in achieving highly active NiMoS phase with the high surface area can be obtained while low content of surfactant (PVP) used. Compared to supported catalysts, longer slabs lengths are typically observed for the unsupported catalysts; this parameter seems to have more impact on the HDS activity than the stacking number [158,163].…”

Section: Template Methodsmentioning

confidence: 99%

Recent Insights in Transition Metal Sulfide Hydrodesulfurization Catalysts for the Production of Ultra Low Sulfur Diesel: A Short Review

et al. 2019

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The literature from the past few years dealing with hydrodesulfurization catalysts to deeply remove the sulfur-containing compounds in fuels is reviewed in this communication. We focus on the typical transition metal sulfides (TMS) Ni/Co-promoted Mo, W-based bi- and tri-metallic catalysts for selective removal of sulfur from typical refractory compounds. This review is separated into three very specific topics of the catalysts to produce ultra-low sulfur diesel. The first issue is the supported catalysts; the second, the self-supported or unsupported catalysts and finally, a brief discussion about the theoretical studies. We also inspect some details about the effect of support, the use of organic and inorganic additives and aspects related to the preparation of unsupported catalysts. We discuss some hot topics and details of the unsupported catalyst preparation that could influence the sulfur removal capacity of specific systems. Parameters such as surface acidity, dispersion, morphological changes of the active phases, and the promotion effect are the common factors discussed in the vast majority of present-day research. We conclude from this review that hydrodesulfurization performance of TMS catalysts supported or unsupported may be improved by using new methodologies, both experimental and theoretical, to fulfill the societal needs of ultra-low sulfur fuels, which more stringent future regulations will require.

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“…[6][7][8], the unsupported hydrogenation catalysts are made up of entirely active components and auxiliaries, and not limited by the lack of active components. The unsupported catalysts are usually synthesized by a co-precipitation method [9,10], and the catalyst precursors are mainly ammonium nickel molybdate crystals [11,12], which produce a lower specific surface area and have less pore distribution than the supported catalysts. Additionally, the unsupported catalysts have high HDS activity only after activation.…”

Section: Introductionmentioning

confidence: 99%

Acid Modification of the Unsupported NiMo Catalysts by Y-Zeolite Nanoclusters

Dong

Yin

et al. 2019

Crystals

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Unsupported NiMo catalyst has high hydrogenation activity due to its high active site distribution. However, low specific surface area and pore distribution greatly limit the efficient utilization of the active components. The Y-zeolite nanoclusters were hydrothermally synthesized and introduced into the unsupported NiMo catalysts from a layered nickel molybdate complex oxide. The XRD, N2 adsorption-desorption, FT-IR, Py-IR, SEM, NH3-TPD, and TEM were used to characterize all catalysts. The dibenzothiophene (DBT) hydrodesulfurization (HDS) reaction was performed in a continuous high pressure microreactor. The results showed that the specific surface area, pore volume, and average pore size of the unsupported NiMo catalysts were greatly increased by the Y-zeolite nanoclusters, and a more dispersed structure was produced. Furthermore, the Lewis acid and total acid content of the unsupported NiMo catalysts were greatly improved by the Y-zeolite nanoclusters. The HDS results showed that the unsupported NiMo catalysts modified by the nanoclusters had the same high desulfurization efficiency as the unmodified catalyst, but had more proportion of direct desulfurization (DDS) products. The results offer an alternative to reducing hydrogen consumption and save cost in the production of ultra clean diesel.

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Effect of NiMo phases on the hydrodesulfurization activities of dibenzothiophene

Cited by 45 publications

References 27 publications

Influence of Pluronic® P123 Addition in the Synthesis of Bulk Ni Promoted MoS2 Catalyst. Application to the Selective Hydrodesulfurization of Sulfur Model Molecules Representative of FCC Gasoline

Influence of Pluronic® P123 Addition in the Synthesis of Bulk Ni Promoted MoS2 Catalyst. Application to the Selective Hydrodesulfurization of Sulfur Model Molecules Representative of FCC Gasoline

Recent Insights in Transition Metal Sulfide Hydrodesulfurization Catalysts for the Production of Ultra Low Sulfur Diesel: A Short Review

Acid Modification of the Unsupported NiMo Catalysts by Y-Zeolite Nanoclusters

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