Investigation of the Active Phase in K-Promoted MoS2 Catalysts for Methanethiol Synthesis

Miao Yu, Nikolay Kosinov, Lennart Van Haandel, Patricia J. Kooyman, Emiel J.M. Hensen

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

Uittreksel

K-promoted MoS2 is an active catalyst for the synthesis of CH3SH, a valuable chemical intermediate, from synthesis gas (CO/H2) and H2S. The promotion of MoS2 by K increases the CO conversion rate and the CH3SH selectivity and is usually linked to the stabilization of the 1T-MoS2 polymorph as compared to the 2H-MoS2 in K-free samples. Sulfided catalysts were characterized using TEM, XPS, and EXAFS. TEM showed that MoS2 particles became larger and more stacked when the K/Mo ratio increased above unity. XPS and EXAFS evidenced the formation of the 1T-MoS2 phase at higher K/Mo ratio in addition to 2H-MoS2. The addition of K to MoS2 led to increased CH3SH productivity due to both increased CO conversion and CH3SH selectivity (T = 300-400 °C, P = 10 bar). The performance of the most active catalyst with a K/Mo ratio of 2 was found to be stable, despite the observation that the initially present 1T-MoS2 phase slowly converted to the 2H-MoS2 phase during the reaction at high pressure. There is no correlation between the CH3SH productivity and the amount of 1T-MoS2 in K-promoted MoS2 catalysts.

Originele taal-2Engels
Pagina's (van-tot)1838-1846
Aantal pagina's9
TijdschriftACS Catalysis
Vroegere onlinedatum2020
DOI's
StatusE-publicatie vóór gedrukte publicatie - 2020

Vingerafdruk

Carbon Monoxide
Catalysts
X ray photoelectron spectroscopy
Productivity
Transmission electron microscopy
Synthesis gas
Polymorphism
Stabilization
methylmercaptan

Citeer dit

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title = "Investigation of the Active Phase in K-Promoted MoS2 Catalysts for Methanethiol Synthesis",
abstract = "K-promoted MoS2 is an active catalyst for the synthesis of CH3SH, a valuable chemical intermediate, from synthesis gas (CO/H2) and H2S. The promotion of MoS2 by K increases the CO conversion rate and the CH3SH selectivity and is usually linked to the stabilization of the 1T-MoS2 polymorph as compared to the 2H-MoS2 in K-free samples. Sulfided catalysts were characterized using TEM, XPS, and EXAFS. TEM showed that MoS2 particles became larger and more stacked when the K/Mo ratio increased above unity. XPS and EXAFS evidenced the formation of the 1T-MoS2 phase at higher K/Mo ratio in addition to 2H-MoS2. The addition of K to MoS2 led to increased CH3SH productivity due to both increased CO conversion and CH3SH selectivity (T = 300-400 °C, P = 10 bar). The performance of the most active catalyst with a K/Mo ratio of 2 was found to be stable, despite the observation that the initially present 1T-MoS2 phase slowly converted to the 2H-MoS2 phase during the reaction at high pressure. There is no correlation between the CH3SH productivity and the amount of 1T-MoS2 in K-promoted MoS2 catalysts.",
keywords = "characterization, K promotion, methanethiol, MoS, synthesis gas",
author = "Miao Yu and Nikolay Kosinov and {Van Haandel}, Lennart and Kooyman, {Patricia J.} and Hensen, {Emiel J.M.}",
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Investigation of the Active Phase in K-Promoted MoS2 Catalysts for Methanethiol Synthesis. / Yu, Miao; Kosinov, Nikolay; Van Haandel, Lennart; Kooyman, Patricia J.; Hensen, Emiel J.M.

In: ACS Catalysis, 2020, blz. 1838-1846.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

TY - JOUR

T1 - Investigation of the Active Phase in K-Promoted MoS2 Catalysts for Methanethiol Synthesis

AU - Yu, Miao

AU - Kosinov, Nikolay

AU - Van Haandel, Lennart

AU - Kooyman, Patricia J.

AU - Hensen, Emiel J.M.

PY - 2020

Y1 - 2020

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AB - K-promoted MoS2 is an active catalyst for the synthesis of CH3SH, a valuable chemical intermediate, from synthesis gas (CO/H2) and H2S. The promotion of MoS2 by K increases the CO conversion rate and the CH3SH selectivity and is usually linked to the stabilization of the 1T-MoS2 polymorph as compared to the 2H-MoS2 in K-free samples. Sulfided catalysts were characterized using TEM, XPS, and EXAFS. TEM showed that MoS2 particles became larger and more stacked when the K/Mo ratio increased above unity. XPS and EXAFS evidenced the formation of the 1T-MoS2 phase at higher K/Mo ratio in addition to 2H-MoS2. The addition of K to MoS2 led to increased CH3SH productivity due to both increased CO conversion and CH3SH selectivity (T = 300-400 °C, P = 10 bar). The performance of the most active catalyst with a K/Mo ratio of 2 was found to be stable, despite the observation that the initially present 1T-MoS2 phase slowly converted to the 2H-MoS2 phase during the reaction at high pressure. There is no correlation between the CH3SH productivity and the amount of 1T-MoS2 in K-promoted MoS2 catalysts.

KW - characterization

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