Catalytic synthesis of methanethiol from methanol and carbon disulfide over KW/Al2O3 catalysts

Wang, Weiming; Li, Yang; Zhang, Xiang; Fang, Weiping; Yang, Yiquan

doi:10.1016/j.catcom.2015.06.001

Cited by 18 publications

(10 citation statements)

References 17 publications

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“…Conformation and position of most of these Raman bands were confirmed by DFT calculation [105]. Surface acidity was probed by NH3-TPD [103] or NH3 adsorption monitored by FTIR [104], while basicity was probed by CO2-TPD. K2O suppressed both Brønsted and Lewis acidity from the surface WOx species or exposed…”

Section: Figure 12mentioning

confidence: 86%

“…Adsorption of CO 2 , nil on unpromoted WO 3 /Al 2 O 3 (no basic sites), significantly increases on K 2 O-promoted catalysts. Residual acidity could play a major role in catalytic activity, while basicity would be essential for a good selectivity for methyl mercaptan [103].…”

Section: Alumina-supported Tungsten Oxidesmentioning

confidence: 99%

“…All these reactions were reviewed by Taifan and Baltrusaitis [102]. Structural and acid-base properties of K2O-WO3-Al2O3 catalysts were recently investigated by Wang et al [103], Zhu et al [104] and Kiani et al [105]. Raman spectroscopy was used to differentiate and detect crystalline WO3 (bands at 273, 719 and 809 cm −1 ), crystalline K2WO4 (bands at 324 and 927 cm −1 ) and dispersed surface oligomeric WOx species on alumina (strong band at 1021 cm −1 ).…”

Section: Figure 12mentioning

confidence: 99%

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Tungsten-Based Catalysts for Environmental Applications

2021

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This review aims to give a general overview of the recent use of tungsten-based catalysts for wide environmental applications, with first some useful background information about tungsten oxides. Tungsten oxide materials exhibit suitable behaviors for surface reactions and catalysis such as acidic properties (mainly Brønsted sites), redox and adsorption properties (due to the presence of oxygen vacancies) and a photostimulation response under visible light (2.6–2.8 eV bandgap). Depending on the operating condition of the catalytic process, each of these behaviors is tunable by controlling structure and morphology (e.g., nanoplates, nanosheets, nanorods, nanowires, nanomesh, microflowers, hollow nanospheres) and/or interactions with other compounds such as conductors (carbon), semiconductors or other oxides (e.g., TiO2) and precious metals. WOx particles can be also dispersed on high specific surface area supports. Based on these behaviors, WO3-based catalysts were developed for numerous environmental applications. This review is divided into five main parts: structure of tungsten-based catalysts, acidity of supported tungsten oxide catalysts, WO3 catalysts for DeNOx applications, total oxidation of volatile organic compounds in gas phase and gas sensors and pollutant remediation in liquid phase (photocatalysis).

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Section: Figure 12mentioning

confidence: 86%

Section: Alumina-supported Tungsten Oxidesmentioning

confidence: 99%

Section: Figure 12mentioning

confidence: 99%

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Tungsten-Based Catalysts for Environmental Applications

2021

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“…As an important organic intermediate in the fields of pesticides, medicine, and animal feed, the most important application of methanethiol (CH 3 SH) is the production of methionine, an essential amino acid for humans and animals [ 1 , 2 , 3 , 4 , 5 , 6 ]. Based on the used raw materials and synthesis routes, the production process of CH 3 SH can be divided into the methanol–hydrogen sulfide method, methyl chloride–alkali sulfide method, alkali sulfide–dimethyl sulfate method, thiourea–dimethyl sulfate method, methanol–carbon disulfide method, high-sulfur syngas method, and other methods [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. Among these, the methanol–hydrogen sulfide method has attracted considerable attention due to its higher conversion efficiency and product selectivity [ 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Role of Zirconia in Oxide-Zeolite Composite for Thiolation of Methanol with Hydrogen Sulfide to Methanethiol

Yang

Yao

et al. 2022

Nanomaterials

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In this paper, the molecular sieve NaZSM-5 was modified with zirconium dioxide (ZrO2) by a hydrothermal coating process and other methods. By comparing the effects of the crystal phase structure of ZrO2 and the compositing method on the physicochemical properties and catalytic performance of the obtained composites, the structure–performance relationship of these composite catalysts was revealed. The results indicate that in the hydrothermal system used for the preparation of NaZSM-5, Zr4+ is more likely to dissolve from m-ZrO2 than from t-ZrO2, which can subsequently enter the molecular sieve, causing a greater degree of desiliconization of the framework. The larger specific surface area (360 m2/g) and pore volume (0.52 cm3/g) of the m-ZrO2/NaZSM-5 composite catalyst increase the exposure of its abundant acidic (0.078 mmol/g) and basic (0.081 mmol/g) active centers compared with other composites. Therefore, this catalyst exhibits a shorter induction period and better catalytic performance. Furthermore, compared with the impregnation method and mechanochemical method, the hydrothermal coating method produces a greater variety of acid–base active centers in the composite catalyst due to the hydrothermal modifying effect.

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“…In the field of catalytic synthesis of methanethiol, transition metal sulfides are generally considered to be the main active phase [10,11,14,[17][18][19][20]. Among them, MoS 2 -based catalysts promoted by alkali metals have potential application prospects because of their unique properties, such as sulfur resistance, not ease to coking and avoiding expensive deep desulfurization in industry, which have been also widely used in water-gas shift [21][22][23][24], syngas to higher alcohols [25][26][27][28][29][30], hydrodesulfurization [31][32][33][34] and hydrogenation [35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Methyl Mercaptan on Mesoporous Alumina Prepared with Hydroxysafflor Yellow A as Template: The Synergistic Effect of Potassium and Molybdenum

Peng

Zeng

et al. 2021

Catalysts

Self Cite

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K-promoted Mo-based catalysts showed great promise for the hydrogenation of CS2 to methyl mercaptan (CH3SH). However, the research on the synergistic effect of K and Mo, and the active site of CS2 hydrogenation to CH3SH were unexplored widely. To solve this problem, the synergistic effect of K and Mo in the K-promoted Mo-based catalysts for CS2 hydrogenation to prepare CH3SH was investigated. The mesoporous alumina was the support and loaded the active components potassium and molybdenum to prepare the catalyst. The results suggested that the active components K and Mo can not only cooperatively regulate the acid-base sites on the catalyst surface, but also stabilize the molybdate species at +5 valence during the reduction process and increase the Mo unsaturated coordination sites. Combined with the results of the catalytic activity evaluation, indicating that the main active site of the catalysts is the weak Lewis acid-base site, and the strong acidic site and strong alkaline site are not conducive to the formation of CH3SH. Moreover, the possible catalytic mechanism of CS2 hydrogenation to CH3SH on the weak Lewis acid-base sites of the catalysts was proposed. The research results of this paper can provide an experimental basis and theoretical guidance for the design of high-performance CH3SH synthesis catalyst and further mechanism research.

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Catalytic synthesis of methanethiol from methanol and carbon disulfide over KW/Al2O3 catalysts

Cited by 18 publications

References 17 publications

Tungsten-Based Catalysts for Environmental Applications

Tungsten-Based Catalysts for Environmental Applications

Role of Zirconia in Oxide-Zeolite Composite for Thiolation of Methanol with Hydrogen Sulfide to Methanethiol

Synthesis of Methyl Mercaptan on Mesoporous Alumina Prepared with Hydroxysafflor Yellow A as Template: The Synergistic Effect of Potassium and Molybdenum

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