Enhanced catalytic performance and promotional effect of molybdenum sulfide cluster-derived catalysts for higher alcohols synthesis from syngas

Wang, Na; Li, Jianli; Hu, Ruijue; Su, Haiquan; Gu, Xuehong

doi:10.1016/j.cattod.2018.03.007

Cited by 13 publications

(12 citation statements)

References 42 publications

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“…The authors found that at higher Co loadings, the number of active Co–Mo–S species would decrease because of the formation of Co 9 S 8 crystallites, which are favorable to hydrocarbon formation. Similar results were also observed in K-promoted Ni–MoS 2 catalysts, where the synergism of Mo and Ni is essential for HA formation. − Moreover, Ni has been reported to show bifunctionality in Ni–MoS 2 catalysts. Sun’s group found that Ni species not only promoted the carbon chain growth but also activated carbon chains for CO insertion, resulting in a maximum C 2+ OH/C 1 OH ratio of 8.75 when the Ni/Mo ratio was 0.5 .…”

Section: Bimetallic Catalystssupporting

confidence: 66%

“…Fischer–Tropsch elements (Co, Ni, and Fe) are recognized as active centers for hydrocarbon formation, which facilitate CO dissociation and carbon chain growth in the CO hydrogenation reaction. As a result, much attention has been paid to Mo–Co, − Mo–Ni, − and Mo–Fe − bimetallic catalysts for HAS.…”

Section: Bimetallic Catalystsmentioning

confidence: 99%

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Active Centers of Catalysts for Higher Alcohol Synthesis from Syngas: A Review

et al. 2018

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The gradual depletion of oil resources and the necessity to reduce greenhouse gas emissions portray a concerning image of our contemporary security of liquid transportation fuels in the event of a global crisis. Despite a vast amount of natural gas resources that we have and the huge economic incentive, the conversion of gas to liquid fuels or chemicals is still very limited because of the high technological complexity and capital cost for facilities. However, with the anticipated depletion of liquid petroleum and the soaring price of crude oil, the conversion of natural gas to liquid feedstock or fuels will become more and more important. Higher alcohols are important feedstocks for the chemical and pharmaceutical industries and have wide applications as potential fuel additives or hydrogen carriers for fuel cells for clean energy delivery. There is a long-standing interest in the synthesis of higher alcohols from syngas, an important Fischer–Tropsch technology for natural gas conversion. The purpose of this review is to provide readers with an extensive account of catalytic synthesis of higher alcohols from syngas using various catalysts reviewed from a unique perspective: clarification of the active centers and reaction pathways. In light of the different sources providing the active centers, three major classes of catalysts in terms of monometallic, bimetallic, and trimetallic/multimetallic catalysts are systematically reviewed, and their respective performances are carefully compared. Finally, future works proposed to improve the catalyst design are described.

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Section: Bimetallic Catalystssupporting

confidence: 66%

Section: Bimetallic Catalystsmentioning

confidence: 99%

Active Centers of Catalysts for Higher Alcohol Synthesis from Syngas: A Review

et al. 2018

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“…This is unfavorable for the formation of NiWS phases because of the less exposed edge sites of WS 2 slabs. 63 In contrast, all tungsten sulfides are well dispersed on LDH-based catalysts. The peculiar properties of LDHs facilitate preparing homogeneous mixtures containing well-dispersed elements in both the layer and the interlayer in a wide range of compositions.…”

Section: Resultsmentioning

confidence: 99%

“…Brito and Barbosa reported that the low-temperature TPR-S peaks of NiMo and NiCoMo sulfided catalysts were centered at 320–326 °C and assigned to nonstoichiometric sulfur species. Wang et al suggested that the TPR-S peak of molybdenum sulfides in 200–400 °C was ascribed to the reduction of S 2 2– . The second peak (II) ranging from 300 to 500 °C is assigned to a reaction of −SH with H 2 and a reaction between surface sulfur anions with H 2 . , This peak corresponds to the formation of coordinately unsaturated sites (CUS) at the corner or edge of WS 2 slabs, which are considered as catalytic active sites .…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization, and Hydrotreating Activity of NiW Presulfurized Catalysts Prepared via a Tetrathiotungstate-Intercalated NiAl LDH

Wang

Yang

et al. 2020

ACS Omega

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A tetrathiotungstate-intercalated NiAl layered double hydroxide (LDH) was synthesized and then calcined under N 2 at various temperatures to prepare a series of NiW presulfurized hydrotreating catalysts. Upon calcination, WS 4 2– in the interlayer decomposes into WS 3 and then WS 2 , releasing sulfur to sulfurize nickel in the sheets. The property and activities of catalysts for hydrodesulfurization (HDS) of dibenzothiophene and hydrodearomatization (HDA) of tetralin are dependent on the calcination temperature. At 300 °C, WS 3 can be well maintained, offering highly active hydrogenation sites S 2 2– and superior HDA activity. As the temperature increases up to 500 °C, WS 3 converts into WS 2 , while nickel sulfides migrate to the edge of WS 2 to form NiWS phases with high HDS activity. LDH-based presulfurized catalysts can achieve fully sulfurized and well-dispersed tungsten species even at high tungsten loadings and can retain more WS 3 even at high temperatures because of the peculiar properties of LDHs. Therefore, they show better HDS and superior HDA activities over an oxidic NiW LDH-based catalyst (LDO) and an alumina-supported NiWS presulfurized catalyst (NiWS/Al 2 O 3 ). The optimized catalyst shows 1.59 and 1.05 times higher HDS activity than LDO and NiWS/Al 2 O 3 while 2.05 and 1.77 times higher HDA activity than LDO and NiWS/Al 2 O 3 , respectively. It also shows better HDS and HDA activity for a real diesel than a NiCoMoW/Al 2 O 3 commercial catalyst.

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“…This kind of catalyst shows good catalytic performance. Wang Na et al 36 reported a series of catalysts prepared by using molybdenum sulfide clusters as precursors, which provided good dispersion of MoS 2 particles with many coordination unsaturated Mo sites, which was conducive to the formation of intermediate active phase and improve the catalytic performance.…”

Section: Catalyst Systemmentioning

confidence: 99%