The influence of activation atmosphere on the active phase and hydrotreating activity of LDH-based NiW pre-sulfurized catalysts

Wang, Hao; Xiong, Hongchuan; Yang, Fan; Li, Yang; He, Shiang; Wu, Yan

doi:10.1039/d2re00540a

Cited by 2 publications

(1 citation statement)

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“…Tungsten has similar physicochemical properties with molybdenum; moreover, China has the world’s highest tungsten reserves and production of tungsten. Lately, our groups synthesized MoS 4 2– and WS 4 2– intercalated NiAl LDHs − as presulfurized hydrotreating catalysts. Considering the similar properties of WS 4 2– and MoS 4 2– , WS 4 2– -intercalated LDHs may also have good adsorption performance for heavy-metal cations, which has not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of WS₄^2– Intercalated NiZnAl LDHs as Effective Adsorbents to Remove Copper Ions from Water

Wang,

Li,

et al. 2024

Langmuir

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A series of WS 4 2− intercalated NiZnAl ternary-layered double-hydroxides (LDHs) with various Ni/Zn ratios were synthesized by an ion-exchange method and used as adsorbents to remove Cu 2+ from water. The introduction of Zn produced ZnS on the surface of LDHs. The LDH with the Ni/Zn/Al molar ratio of 0.1/1.9/1 showed the best adsorption ability. Cu 2+ ions are removed via three routes: forming [Cu−WS 4 ] n− complexes via soft acid−soft base interaction between WS 4 2− and Cu 2+ , isomorphic substitution of Zn 2+ in sheets by Cu 2+ , and cation exchange of Cu 2+ , with ZnS on the surface of LDHs. With the increased Cu 2+ concentration, the complexes dominated the adsorption because polynuclear [Cu−WS 4 ] n− complexes with high Cu/W ratios (2−6) may be formed. Cu + is present in such complexes, which is produced by the internal redox. Even at Cu 2+ concentration up to 600 mg•L −1 , neither amorphous CuWS 4 nor decreased interlayer distance was observed. Contrarily, the interlayer distance was slightly enlarged due to forming bigger [Cu−WS 4 ] n− complexes. The adsorption followed the pseudo-second-order kinetics and Langmuir isotherm model. The experimental maximum adsorption capacity reached 555.4 mg•g −1 .

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Section: Introductionmentioning

confidence: 99%

Synthesis of WS₄^2– Intercalated NiZnAl LDHs as Effective Adsorbents to Remove Copper Ions from Water

Wang,

Li,

et al. 2024

Langmuir

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Presulfurized Hydrotreating Catalysts Prepared from Tetrathiotungstate- Intercalated NiZnAl Layered Double Hydroxides

Wang,

Zhao,

et al. 2024

Energy Fuels

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Zn was introduced into the sheets of WS 4 2− intercalated NiAl layered double hydroxides (LDHs), followed by calcination under N 2 to prepare a series of presulfurized NiZnWAl hydrotreating (HT) catalysts. The influences of calcination temperature and Ni/Zn ratio on the properties, hydrodesulfurization (HDS) activity for dibenzothiophene (DBT), and hydrodearomatization (HDA) activity for tetralin (THN) of the catalysts were investigated. The incorporation of Zn led to the formation of ZnS on the surface and reduced the thermal stability of the LDHs. During the decomposition of LDHs, WS 3 and NiWS phases were formed successively, which are respectively related to HDA and HDS. Both WS 3 and NiWS decreased as the calcination temperature increased, due to the deep decomposition and the aggregation of metal sulfides. The catalyst calcined at 300 °C shows the highest HDS and HDA activities. Zn-containing catalysts exhibited much higher HDS activity but lower HDA activity compared to the catalyst without Zn. The rate constants k HDS and k HDA of the catalyst with a Ni/Zn ratio of 0.2/1.8 were, respectively, 2.14 times higher and 1.97 times lower than those of the catalyst without Zn. For Zn-containing LDHs, the decomposition of interlayer WS 4 2− was accelerated, leading to a decrease in WS 3 . Moreover, ZnS on the surface could enhance spillover hydrogen (H so ) to form coordinately unsaturated sites (CUS) and further induces highly unsaturated CUS to depress the HYD activity. This work might uncover a novel and convenient way to tune the HDS and HDA activities of LDH-based presulfurized HT catalysts by introducing Zn, which is promising for deep HDS and controllable HDA of diesel fractions.

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The influence of activation atmosphere on the active phase and hydrotreating activity of LDH-based NiW pre-sulfurized catalysts

Abstract: Activation atmosphere and temperature determined active phases of NiW pre-sulfurized hydrotreating catalysts prepared via a tetrathiotungstate intercalated NiAl layered double hydroxide.

Cited by 2 publications

References 54 publications

Synthesis of WS₄^2– Intercalated NiZnAl LDHs as Effective Adsorbents to Remove Copper Ions from Water

Synthesis of WS₄^2– Intercalated NiZnAl LDHs as Effective Adsorbents to Remove Copper Ions from Water

Presulfurized Hydrotreating Catalysts Prepared from Tetrathiotungstate- Intercalated NiZnAl Layered Double Hydroxides

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The influence of activation atmosphere on the active phase and hydrotreating activity of LDH-based NiW pre-sulfurized catalysts

Abstract: Activation atmosphere and temperature determined active phases of NiW pre-sulfurized hydrotreating catalysts prepared via a tetrathiotungstate intercalated NiAl layered double hydroxide.

Cited by 2 publications

References 54 publications

Synthesis of WS42– Intercalated NiZnAl LDHs as Effective Adsorbents to Remove Copper Ions from Water

Synthesis of WS42– Intercalated NiZnAl LDHs as Effective Adsorbents to Remove Copper Ions from Water

Presulfurized Hydrotreating Catalysts Prepared from Tetrathiotungstate- Intercalated NiZnAl Layered Double Hydroxides

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Synthesis of WS₄^2– Intercalated NiZnAl LDHs as Effective Adsorbents to Remove Copper Ions from Water

Synthesis of WS₄^2– Intercalated NiZnAl LDHs as Effective Adsorbents to Remove Copper Ions from Water