Restraining deactivation of hierarchical zeolite supported NiW catalysts in the HDS of thiophene

Wang, Yi; Lancelot, Christine; Lamonier, Carole; Yang, Ming; Sun, Yinyong; Morin, Jean-Charles; Rives, Alain

doi:10.1039/c5ra12029b

Cited by 5 publications

(7 citation statements)

References 44 publications

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“…The soft template-assisted synthesis, especially with surfactants, is mostly used for preparing HZs than for designing the efficient HDS catalysts. ,,,,,,,,,,,,,,,,,,− This is because the structure of soft templates can be controlled by changing their functional groups or by tuning the packing parameter, which in turn offers a versatile way to fabricate the mesopores . The postmodification strategies such as demetalation, ,,, compaction method (extrusion ,, and granulation), and steaming are occasionally reported for preparing the HZs, which are subsequently used in designing efficient HDS catalysts.…”

Section: Zeolite-based Hds Catalystsmentioning

confidence: 99%

“…25,26,58,60,69,71,72,82,89,92,118,119,122,125,126,128,129,132,142−157 This is because the structure of soft templates can be controlled by changing their functional groups or by tuning the packing parameter, which in turn offers a versatile way to fabricate the mesopores. 22 The postmodification strategies such as demetalation, 68,87,158,159 compaction method (extrusion 61,67,160 and granulation), and steaming 66 are occasionally reported for preparing the HZs, which are subsequently used in designing efficient HDS catalysts.…”

Section: ■ Zeolite-based Hds Catalystsmentioning

confidence: 99%

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Review on Hydrodesulfurization over Zeolite-Based Catalysts

Cui

Antony

Fan

et al. 2021

Ind. Eng. Chem. Res.

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Concerning the environmental and health problems related to SO x emission, the environmental protection agencies are incessantly tightening the permissible sulfur level in fuels such as gasoline and diesel. This gives a greater challenge for the traditional hydrodesulfurization (HDS), which is quite inefficient for removing refractory sulfur (RS) compounds (e.g., 4,6-dimethyldibenzothiophene). Consequently, the new efficient HDS catalysts for substituting the industrial HDS catalysts (Ni(Co)Mo/Al2O3) have received much attention. Zeolite-containing HDS catalysts are of particular importance because zeolites could alleviate the HDS of RS compounds via isomerization and cracking abilities of their Brønsted acid sites. The microporous zeolites slow down the diffusion of reactants and products, leading to uncontrolled cracking reactions that promote the coke formation and thus deactivate the HDS catalysts. Therefore, the application of zeolite-based catalysts was limited for HDS reactions in the early years. But, due to the introduction of hierarchical porous structure in zeolites, the cracking reactions catalyzed by strong Brønsted acid sites are controlled and uninterrupted molecular diffusion becomes highly possible. As a sequel, a better selectivity and improved HDS efficiency are attainable without any coke formation or with a reduced coke formation. Besides the porosity and acidity of zeolites, the synthetic methods and precursors of zeolite-based HDS catalysts and the mixing of zeolites with other supports like Al2O3 have impacts on the efficiency of zeolite-based HDS catalysts. In this review, all these factors are discussed along with the preparation methods of hierarchical zeolites and tuning methods of zeolite acidity. The process and catalyst details of traditional HDS are briefly explained at the outset. The types of metal active component present in various zeolite-based HDS catalysts and how their properties are influenced by zeolites are also summarized.

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Section: Zeolite-based Hds Catalystsmentioning

confidence: 99%

Section: ■ Zeolite-based Hds Catalystsmentioning

confidence: 99%

Review on Hydrodesulfurization over Zeolite-Based Catalysts

Cui

Antony

Fan

et al. 2021

Ind. Eng. Chem. Res.

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“…For Ni 2p 3/2 , the spectrum can be deconvoluted into four peaks. The peaks with binding energies around 852.8 and 853.8 eV are attributed to Ni 2+ in NiS x and NiWS, respectively, 50 while the peaks around 856.5 and 862.0 eV are attributed to Ni 2+ in NiO and its shake-up satellite line, respectively. 54 , 55 Because of the electron transfer from Ni to its WS neighbor in the NiWS phase, the binding energy of Ni 2+ in the NiWS phase is higher than that of Ni 2+ in NiS x .…”

Section: Resultsmentioning

confidence: 99%

“…The W 4f spectrum of WLDS-300 can be deconvoluted into three doublets arising from the 4f 5/2 and 4f 7/2 lines of W 4+ , W 5+ , and W 6+ . For the fitting, the area ratio of 4f 7/2 to 4f 5/2 is kept at 4:3 and the doublet separation is around 2.1 eV. , The W 4+ state with a binding energy around 32.2 (4f 7/2 ) and 34.3 eV (4f 5/2 ) relates to WS 2 . The peaks at 32.8 and 34.9 eV are indicative of 4f 7/2 and 4f 5/2 of the W 5+ species in WS 3 , respectively .…”

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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“…2 Specifically, HDS process is an efficient method for removing thiols, sulfides and disulfides from fuel oils. [3][4][5][6][7] However, the removal of DBT, 4,6-DMDBT and BT etc. via HDS processes is quite challenging.…”

Section: Introductionmentioning

confidence: 99%

A multicomponent assembly approach for the design of deep desulfurization heterogeneous catalysts

Xuan

Zhang

et al. 2016

Dalton Trans.

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A multicomponent assembly approach for the design of deep desulfurization heterogeneous catalysts. Dalton Transactions, 45(48), pp. 19511-19518. (doi:10.1039/C6DT03445D) This is the author's final accepted version.There may be differences between this version and the published version. You are advised to consult the publisher's version if you wish to cite from it. Deep desulfurization process is a challenging task and global efforts are focused on the development of new approaches for the reduction of sulfur-containing compounds in fuel oils. In this work, we have proposed a new design strategy for the development of deep desulfurization heterogeneous catalysts. Based on the adopted design strategy, a novel composite material of polyoxometalate (POM)-based ionic liquid-grafted layered double hydroxides (LDHs) was synthesized by an exfoliation/grafting/assembly process. The structural properties of the as-prepared catalyst were characterized using FT-IR, XRD, TG, NMR, XPS, BET, SEM and HRTEM. The heterogeneous catalyst exhibited high activity in deep desulfurization of DBT (dibenzothiophene) 4,6-DMDBT (4,6-dimethyldibenzothiophene) and BT (benzothiophene) at 70 o C in 25, 30 and 40 minutes, respectively. The catalyst can be easily recovered and reused for at least ten times without obvious decrease of its catalytic activity. Such excellent sulfur removal ability as well as the cost efficiency of the novel heterogeneous catalyst can be attributed to the rational design, where the spatial proximity of the substrate and the active sites, the immobilization of ionic liquid onto the LDHs via covalent bonding and the recyclability of the catalyst are carefully considered.

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Restraining deactivation of hierarchical zeolite supported NiW catalysts in the HDS of thiophene

Cited by 5 publications

References 44 publications

Review on Hydrodesulfurization over Zeolite-Based Catalysts

Review on Hydrodesulfurization over Zeolite-Based Catalysts

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

A multicomponent assembly approach for the design of deep desulfurization heterogeneous catalysts

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