A novel pre-sulfided hydrotreating catalyst derived from thiomolybdate intercalated NiAl LDHs

Wang, Hao; Fan, Qiong; Yang, Zuosheng; Tang, Siyao; Chen, Jingye; Wu, Yan

doi:10.1016/j.mcat.2019.01.027

Cited by 21 publications

(24 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The multistep thermal decompositions of WS 4 2– and LDHs are mixed together, resulting in the counteracting thermal behaviors; therefore, no obvious endothermal or exothermal peak is observed in the DSC curve of NiAl–WS 4 . The decomposition behavior of NiAl–WS 4 is similar to that of a tetrathiomolybdate-intercalated NiAl LDH reported previously . In addition, the complete decomposition of NiAl–WS 4 occurs above 650 °C, which is close to that of a tetrathiomolybdate-intercalated MgAlFe LDH and CaAl LDH .…”

Section: Resultssupporting

confidence: 83%

“…Additionally, WLDS-300 exhibits 2.05 times k HDA enhancement over LDO because of the absence of S 2 2– in the latter. As reported previously, S 2 2– species are hard to be formed on oxidic catalysts because the sulfurization of MoO 3 or WO 3 undergoes oxygen–sulfur exchange to form Mo oxysulfide (MoO x S y ) containing S 2 2– ligands at the sulfurization temperature around 100–150 °C; however, such an oxysulfide will decompose with the raised sulfurization temperature and disappear completely around 200–250 °C. Nevertheless, oxidic catalysts have to be sulfurized above 300 °C.…”

Section: Resultsmentioning

confidence: 75%

“…Catalytic activity tests were performed in a tubular flow fixed-bed microreactor operated in a continuous mode, whose size and catalyst packing were reported previously. 25 1 wt % DBT (98%, J&K, China)/cyclohexane (AR, Kelong, China) and 5 wt % THN (99%, J&K, China)/heptane (AR, Kelong, China) were used as HDS and HDA feeds, respectively. For the presulfurized catalysts, the reaction was carried out at 300 °C, 4 MPa H 2 pressure, a liquid hourly space velocity of 16.5 h –1 , and a hydrogen/hydrocarbon ratio 400.…”

Section: Methodsmentioning

confidence: 99%

“…The HDS and HDA activities were expressed by the reaction rate constant ( k HDS or k HDA ) and TOF. 25 HDS of DBT occurs in two parallel pathways. One is DDS, for which sulfur elimination takes place via hydrogenolysis of C–S bonds and yields a main product of biphenyl (BP).…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, an idea is generated to prepare presulfurized hydrotreating catalysts based on thiomolybdate- or thiotungstate-intercalated LDHs, which could take advantages of the favorable characteristics of LDHs to solve the problems of bulk and supported presulfurized catalysts. In our previous study, a tetrathiomolybdate-intercalated NiAl LDH was synthesized as a precursor to prepare a series of presulfurized catalysts with high HDS activity and superior HDA activity. It is generally accepted that tungsten-based hydrotreating catalysts have better HYD activity than Mo-based catalysts because tungsten sulfides are more preferable to lose sulfur ions under H 2 and thus are easier to form anion vacancies as active sites when compared to molybdenum sulfides .…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

Wang

Yang

et al. 2020

ACS Omega

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 75%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Wang

Yang

et al. 2020

ACS Omega

Self Cite

View full text Add to dashboard Cite

show abstract

A Unique Etching‐Doping Route to Fe/Mo Co‐Doped Ni Oxyhydroxide Catalyst for Enhanced Oxygen Evolution Reaction

Wei

Wang

et al. 2023

Small

View full text Add to dashboard Cite

Fe‐doped Ni (oxy)hydroxide shows intriguing activity toward oxygen evolution reaction (OER) in alkaline solution, yet it remains challenging to further boost its performance. In this work, a ferric/molybdate (Fe3+/MoO42−) co‐doping strategy is reported to promote the OER activity of Ni oxyhydroxide. The reinforced Fe/Mo‐doped Ni oxyhydroxide catalyst supported by nickel foam (p‐NiFeMo/NF) is synthesized via a unique oxygen plasma etching‐electrochemical doping route, in which precursor Ni(OH)2 nanosheets are first etched by oxygen plasma to form defect‐rich amorphous nanosheets, followed by electrochemical cycling to trigger simultaneously Fe3+/MoO42− co‐doping and phase transition. This p‐NiFeMo/NF catalyst requires an overpotential of only 274 mV to reach 100 mA cm−2 in alkaline media, exhibiting significantly enhanced OER activity compared to NiFe layered double hydroxide (LDH) catalyst and other analogs. Its activity does not fade even after 72 h uninterrupted operation. In situ Raman analysis reveals that the intercalation of MoO42− is able to prevent the over‐oxidation of NiOOH matrix from β to γ phase, thus keeping the Fe‐doped NiOOH at the most active state.

show abstract

A highly efficient and reusable PVDF/ZnAl(DS)LDH composite as sorbent for the separation of oil and organics from water

Gowda,

Mendke,

Srilakshmi

2024

J Porous Mater

View full text Add to dashboard Cite

A novel pre-sulfided hydrotreating catalyst derived from thiomolybdate intercalated NiAl LDHs

Cited by 21 publications

References 51 publications

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

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

A Unique Etching‐Doping Route to Fe/Mo Co‐Doped Ni Oxyhydroxide Catalyst for Enhanced Oxygen Evolution Reaction

A highly efficient and reusable PVDF/ZnAl(DS)LDH composite as sorbent for the separation of oil and organics from water

Contact Info

Product

Resources

About