CoMo catalyst on zeolite TS-1 nanorod assemblies with high activity in the hydrodesulfurization of 4,6-dimethyldibenzothiophene

Zhang, Lei; Dai, Quan; Fu, Wenqian; Tang, Tiandi; Dong, Peng; He, Mingyang; Chen, Qun

doi:10.1016/j.jcat.2017.12.015

Cited by 34 publications

(25 citation statements)

References 60 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%

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%

Review on Hydrodesulfurization over Zeolite-Based Catalysts

Cui

Antony

Fan

et al. 2021

Ind. Eng. Chem. Res.

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“…2. Large surface area for the acceleration of active phases in the interaction with organosulfur reagents [3,8].…”

Section: Supportmentioning

confidence: 99%

“…The predominant method of applying the active components onthe support is impregnation with incipient moisture followed by drying and heat treatment of the contact mass at temperatures (110-120 o C) -500 o C [18,8,16].…”

Section: Catalystmentioning

confidence: 99%

Difficulties in the industrial introduction of new effective hydrodesulfurization catalysts in the Russian Federation

Konoplin

Кондрашева

2021

E3S Web Conf.

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The article presents bibliographic knowledgeof the world-scaleinventions that formed the basis ofHDS-catalysts for the development of variousoil products. Extensive studies were conductedon optimizationof carrier properties, active-phase chemical-mass composition, and basictech-nological parameters of transformation of initial components into active six-sided MoS2 groups which are decorated by CoS2 molecules, involving stages of desulfurization ofoxide formsof the catalyst. Differences in the microstructure of Al2O3supportsderived from aluminum hydroxide of vari-ous genesis are described. Comparative possibilitiesof binding properties of aluminum hydroxide raw materials in laboratory tests and molding of-waterpeptidized pastesare presented.

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“…It is expected that high costs can be offset by improving the catalytic performance of noble-metal catalysts. Current research directions for improving their HDS performance mainly includes increasing the dispersion of the metal on supports and adjusting the size of the metal atom. − For example, Xu et al used low-temperature hydrogen plasma while they were synthesizing palladium nanoparticle catalysts on graphene supports. Palladium nanoparticles, 2 nm in size, with good dispersibility, were formed on the graphene sheet.…”

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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CoMo catalyst on zeolite TS-1 nanorod assemblies with high activity in the hydrodesulfurization of 4,6-dimethyldibenzothiophene

Cited by 34 publications

References 60 publications

Review on Hydrodesulfurization over Zeolite-Based Catalysts

Review on Hydrodesulfurization over Zeolite-Based Catalysts

Difficulties in the industrial introduction of new effective hydrodesulfurization catalysts in the Russian Federation

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

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