Mixed NiMo, NiW and NiMoW sulfides obtained from layered double hydroxides as catalysts in simultaneous HDA and HDS reactions

Arias, Santiago; Licea, Yordy E.; Soares, David Mendez; Eon, Jean‐Guillaume; Palacio, Luz Amparo; Faro, Arnaldo C.

doi:10.1016/j.cattod.2017.04.004

Cited by 19 publications

(12 citation statements)

References 38 publications

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“…The potential application of trimetallic and multi-metallic catalysts used as HDS catalysts has also been recently explored. These special types of catalysts have the advantage of having mixed phases, and their catalytic properties can be better tailored than those in bimetallic or monometallic catalysts. , Typically, the trimetallic system comprises of Ni or Co promoter combined with the two prominent active metals, Mo and W, and the synergetic behaviors among these metals are continuously being studied. − Van Haandel et al studied the synergetic effect of Mo and W in the Mo x W (1– x ) /γ-Al 2 O 3 catalysts’ sulfidation and activity, and they also observed that although there was no significant improvement in the catalysts’ degree of sulfidation, the NiMo 0.75 W 0.25 /γ-Al 2 O 3 catalyst performed more efficiently than the corresponding bimetallic catalysts in the HDS of gas oil . This is in line with previous studies using DFT calculations by Thomazeau et al which reported a nearly 30% HDS activity enhancement in the trimetallic NiMoW/γ-Al 2 O 3 in the HDS of gas oil feed (Figure ).…”

Section: Active Phasesmentioning

confidence: 99%

Advanced Hydrodesulfurization Catalysts: A Review of Design and Synthesis

2019

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Proliferating energy consumption, particularly of fossil fuels, has led to an increasing generation of pollutants; many of these harmful products have been of serious environmental concern. While energy demand will continue to grow due to massive urbanization and industrialization, the ability to remove such pollutants has not yet been achieved. Therefore, policies are always being reviewed to accommodate the existing reality of minimizing the amount of pollutants released to the environment on a daily basis. Sulfur dioxide, a major environmental pollutant, gets to the environment through the combustion of sulfur-containing fuel in the engine of automobiles. Over the years, regulatory bodies such as the European Emission Standard have set limits to the amount of sulfur in transportation fuel to safeguard the environment. Lately, the limit for clean fuel specification with respect to sulfur content is set to nearly zero ppm. This policy came at a time when crude oil experienced a large decline in price, in addition to increased sulfur content and daily fluctuations of crude density. Compliance with this tight regulation will mean that refineries are expected to either modify their hydrotreating unit, which is capital intensive, or adopt robust catalysts, through research, that can work in tandem with the existing conventional hydrotreating catalysts to reduce the sulfur level to the required limit. This urgent demand has once more drawn the attention of the scientific community. Since there has been a great stock of research outcomes with respect to catalysts for hydrodesulfurization application in recent times, our aim is to collect and review those recent articles on hydrodesulfurization catalyst design and development. The tutorial review is therefore intended to cover a basic hydrodesulfurization overview, followed by detailed discussions on the recent development in the choice of active phases, their supports, and synthesis strategies. The work is expected to guide researchers, especially beginners that are interested in refinery hydrotreatment, on the recent development in hydrodesulfurization catalyst design and development.

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Section: Active Phasesmentioning

confidence: 99%

Advanced Hydrodesulfurization Catalysts: A Review of Design and Synthesis

2019

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“…Recently, there have been attempts to add noble metals to conventional bimetallic catalysts. ,− This is a method to reduce the usage of highly expensive noble metals while maintaining the catalytic performance when developing noble-metal HDS catalysts. Aguirre-Gutierrez et al incorporated Pd into alumina–titanium oxide-supported Ni–Mo catalyst, and the HDS reaction rate of 4,6-DMDBT increased by 30%.…”

Section: Developments Of Ultradeep Hydrodesulfurization Catalystsmentioning

confidence: 99%

Ultradeep Hydrodesulfurization of Diesel: Mechanisms, Catalyst Design Strategies, and Challenges

Weng

Cao

Zhang

et al. 2020

Ind. Eng. Chem. Res.

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With the increasingly strict diesel standards in the countries of the world, deep processing of diesel oil to ultralow sulfur levels is receiving more and more attention. This paper mainly reviews the reaction mechanism, catalysts, and process conditions of diesel hydrodesulfurization, and it provides new research directions for producing ultralow sulfur diesel (ULSD). In terms of mechanism, the sterically hindered sulfides, nitrides, aromatic compounds, and hydrogen sulfide affect the direct desulfurization and hydrogenate pathways of the hydrodesulfurization reaction to varying degrees. In order to eliminate these effects, the properties of high-dispersion active metals, large pore size, high specific surface area, high content of medium-weak acid, and a certain amount of Bronsted acid support are beneficial to further improve the activity of the catalyst, to produce ULSD that meets market demand. This article also reviews the influences of process conditions (for instance, temperature, hydrogen pressure, liquid hourly space velocity, and hydrogen consumption) on the diesel ultradeep hydrodesulfurization reaction, and it finds those moderately high temperatures and high hydrogen partial pressures, as well as low space velocity, to be beneficial. In short, the development of new catalysts is the current research hotspot in the field of ultradeep hydrodesulfurization of diesel, and further research is still needed.

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“…Li’s group , prepared hydrodesulfurization (HDS) catalysts derived from (Mo 7 O 24 ) 6– - and (H 2 W 12 O 40 ) 6– - intercalated NiAl and NiZnAl LDHs. Faro’s group , introduced (Mo 7 O 24 ) 6– and/or (H 2 W 12 O 40 ) 6– into the interlayer of NiAl and CoMgAl LDHs as precursors of dibenzothiophene (DBT) HDS catalysts. Our group , synthesized (W 7 O 24 ) 6– -intercalated NiAl and NiAlZr LDHs as precursors to prepare catalysts for HDS of DBT and diesel.…”

Section: Introductionmentioning

confidence: 99%

“…Our group , synthesized (W 7 O 24 ) 6– -intercalated NiAl and NiAlZr LDHs as precursors to prepare catalysts for HDS of DBT and diesel. Researchers revealed that the hydrotreating catalysts from LDHs might combine the advantages of bulk and supported catalysts because of the easiness of preparation and distinctive properties such as large surface area, well-dispersed active metal species even at high loadings, good thermal stability, and mechanical strength …”

Section: Introductionmentioning

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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Mixed NiMo, NiW and NiMoW sulfides obtained from layered double hydroxides as catalysts in simultaneous HDA and HDS reactions

Cited by 19 publications

References 38 publications

Advanced Hydrodesulfurization Catalysts: A Review of Design and Synthesis

Advanced Hydrodesulfurization Catalysts: A Review of Design and Synthesis

Ultradeep Hydrodesulfurization of Diesel: Mechanisms, Catalyst Design Strategies, and Challenges

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

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