Direct methanation with supported MoS2 nano-flakes: Relationship between structure and activity

Poh, Chee Kok; Ong, Sze Wei Daniel; Du, Yonghua; Kamata, Hiroyuki; Choong, Kai Shin Catherine; Chang, Jie; Izumi, Yoshinori; Nariai, Kentaro; Mizukami, Noriki; Chen, Luwei; Borgna, Armando

doi:10.1016/j.cattod.2019.04.050

Cited by 14 publications

(7 citation statements)

References 34 publications

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“…It is widely accepted that excellent catalytic performance originates from appropriate physiochemical properties 47,48 ; such like good active-metal dispersion, excellent textural…”

Section: Discussionmentioning

confidence: 99%

“…It is widely accepted that excellent catalytic performance originates from appropriate physiochemical properties, , such as good active-metal dispersion, excellent textural properties, and desirable acidity. The DBT HDS activity results in Figure proved that NiMo/ZD series catalysts had great desulfurization performance, among which NiMo/ZD-3 catalyst exhibited the highest HDS activity at various WHSVs.…”

Section: Discussionmentioning

confidence: 99%

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Modified Dendritic Mesoporous Silica Nanospheres Composites: Superior Pore Structure and Acidity for Enhanced Hydrodesulfurization Performance of Dibenzothiophene

et al. 2020

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Dendritic mesoporous silica nanospheres (DMSNs) with center-radical pore structure were successfully fabricated with ZSM-5 seeds to synthesize hierarchically meso-microporous ZSM-5/DMSN (ZD) materials, which were used as the support for preparing HDS catalysts. The catalytic activities were evaluated by adopting DBT as the model oil. ZD composites and the corresponding catalysts were well characterized by XRD, XPS, HRTEM and other techniques. The characterization results manifested that the specific center-radical pore structure was retained after the incorporation of microporous zeolite ZSM-5, thus ZD exhibited a wide pore diameter about 17 nm, which was definitely preferable for mass transfer in S removal process. Meantime, the open pore channels enhanced the accessibility of active sites on the internal surface of catalysts. The introducing of ZSM-5 seeds into the framework of DMSNs also improved the acidity and modulated the metal-support interaction as well. As a result, NiMo/ZD series catalysts demonstrated high HDS activities, of which NiMo/ZD-3 achieved the highest HDS efficiency of 98.3%. The superior catalytic performance not only originated from the large center-radical pore structure and good acidity of support, but also related to the suitable metalsupport interaction and perfect dispersion of metallic active sites.

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“…It is widely accepted that excellent catalytic performance originates from appropriate physiochemical properties 47,48 ; such like good active-metal dispersion, excellent textural…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Modified Dendritic Mesoporous Silica Nanospheres Composites: Superior Pore Structure and Acidity for Enhanced Hydrodesulfurization Performance of Dibenzothiophene

et al. 2020

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“…They suggested that the excess hydroxyl ions present in the precursor solution caused the MoS 2 crystallites to grow in a lamellar structure by blocking the (0 0 1) plane of the crystallites. Further, it has been found that a nanoflake morphology can be obtained by thermally decomposing ATTM under H 2 in the presence of elemental sulfur, which might play an important role in suppressing the aggregation of MoS 2 nanoflakes [37]. Consequently, the observation of a flower-like MoS 2 morphology at a high pH was likely due to the presence of excess hydroxyl ions from ammonium hydroxide and abundant sulfur from ATTM [38].…”

Section: Catalyst Morphologymentioning

confidence: 99%

Morphology and Catalytic Performance of MoS2 Hydrothermally Synthesized at Various pH Values

et al. 2021

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Although preparation conditions are known to affect the morphology and catalytic performance of hydrothermally synthesized MoS2, the influence of pH remains unclear. Herein, unsupported MoS2 was prepared from ammonium tetrathiomolybdate (ATTM) by a hydrothermal reaction at various pH values under a reaction pressure of 2 MPa. The physical and chemical properties of the MoS2 samples were characterized, and the catalytic performance for CO methanation was examined. With increasing pH, the morphology of the MoS2 particles transformed from aggregates of irregular grain-like particles to flower-like particles through the agglomeration of fine mesoporous nanoflakes. Hydrothermal synthesis at a pH of 9.5 increased the MoS2 crystallinity by enhancing the stacking of the (0 0 2) lattice plane. The MoS2 samples prepared at pH 7.0 and 9.5 showed increased CO conversion during methanation, which was associated with a low concentration of Mo5+ species and the presence of surface sulfate species. Thus, a high pH during catalyst preparation may promote the complete decomposition of ATTM to MoS2 and the formation of sulfur vacancies, which can facilitate methanation.

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“…At present, the main research work on direct methanation catalyst is molybdenum sulfide. [9][10][11] Molybdenum based catalysts are mainly used for direct methanation, and MoS 2 is the most active component. The supported catalyst is a sulfur tolerant methanation catalyst which is prepared by loading the active component, Mo precursor, on a single or composite support and vulcanizing.…”

Section: Introductionmentioning

confidence: 99%

“…At present, the main research work on direct methanation catalyst is molybdenum sulfide . Molybdenum based catalysts are mainly used for direct methanation, and MoS 2 is the most active component.…”

Section: Introductionmentioning

confidence: 99%

Methanation Performance of Unsupported MoP Catalysts Prepared with Phytic Acid under Low H₂/CO

Wang

Zhao

et al. 2020

ChemistrySelect

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In this paper, using phytic acid as the precursor, the effects of the reduction temperature and post-treatment conditions on the methanation performance of unsupported MoP catalysts were investigated. The synthesis mechanism and structureactivity relationship of the catalyst were investigated by correlation characterization, such as N 2 adsorption-desorption, XRD, Raman analysis, element analysis and XPS. At the reduction temperature of 650°C, MoP catalysts showed the higher methanation activity due to its smaller crystallite size and large specific surface area. After H 2 post-treatment at 750°C, the CO conversion increased by 16.2% because of the higher specific surface area and lower contents of the carbon and phosphorus species in MoP-750-H. The MoP-750-H catalysts show good stability without H 2 S. The sulfur-resistant methanation tests indicated that the inactivation of the catalysts was more serious with the higher H 2 S concentration, due to the sulfidation from MoP to MoS 2 .

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Direct methanation with supported MoS2 nano-flakes: Relationship between structure and activity

Cited by 14 publications

References 34 publications

Modified Dendritic Mesoporous Silica Nanospheres Composites: Superior Pore Structure and Acidity for Enhanced Hydrodesulfurization Performance of Dibenzothiophene

Modified Dendritic Mesoporous Silica Nanospheres Composites: Superior Pore Structure and Acidity for Enhanced Hydrodesulfurization Performance of Dibenzothiophene

Morphology and Catalytic Performance of MoS2 Hydrothermally Synthesized at Various pH Values

Methanation Performance of Unsupported MoP Catalysts Prepared with Phytic Acid under Low H₂/CO

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Direct methanation with supported MoS2 nano-flakes: Relationship between structure and activity

Cited by 14 publications

References 34 publications

Modified Dendritic Mesoporous Silica Nanospheres Composites: Superior Pore Structure and Acidity for Enhanced Hydrodesulfurization Performance of Dibenzothiophene

Modified Dendritic Mesoporous Silica Nanospheres Composites: Superior Pore Structure and Acidity for Enhanced Hydrodesulfurization Performance of Dibenzothiophene

Morphology and Catalytic Performance of MoS2 Hydrothermally Synthesized at Various pH Values

Methanation Performance of Unsupported MoP Catalysts Prepared with Phytic Acid under Low H2/CO

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Methanation Performance of Unsupported MoP Catalysts Prepared with Phytic Acid under Low H₂/CO