Characterization of CoMo-Al2O3 catalyst by combination technique of temperature-programmed sulfiding and electron spin resonance (TPS-ESR)

Eiji Hayashi; Eiji Iwamatsu; Shakeel Ahmed; Augustine K.K. Lee; Halim Hamid; Yuzo Sanada; Toshikazu Yoneda

doi:10.1627/jpi1958.41.222

Characterization of CoMo-Al₂O₃ catalyst by combination technique of temperature-programmed sulfiding and electron spin resonance (TPS-ESR)

Eiji Hayashi^*
, Eiji Iwamatsu
, Shakeel Ahmed
, Augustine K.K. Lee
, Halim Hamid
, Yuzo Sanada
, Toshikazu Yoneda

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

CoMo-Al₂O₃ catalyst was characterized with a combination technique of temperature-programmed sulfiding (TPS) and electron spin resonance (ESR). The behavior of the MoO₃ loaded over the surface of Al₂O₃ obtained from TPS has been compared with that of Mo⁵⁺ observed with ESR at isothermal and elevated temperatures. The Mo⁶⁺ in the MoO₃ supported is easily reduced with H₂S+H₂ under very mild conditions and transformed into Mo⁵⁺ as an intermediate. This Mo⁵⁺ peak drastically decreased around 200°C with H₂S desorption, and H₂ consumption appeared simultaneously in the TPS profile. These results suggest that the Mo₅₊ species observed with ESR associates with sulfur from H₂S.

Original language	English
Pages (from-to)	222-225
Number of pages	4
Journal	Sekiyu Gakkaishi (Journal of the Japan Petroleum Institute)
Volume	41
Issue number	3
DOIs	https://doi.org/10.1627/jpi1958.41.222
State	Published - 1998

ASJC Scopus subject areas

Fuel Technology
Energy Engineering and Power Technology

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10.1627/jpi1958.41.222

Cite this

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title = "Characterization of CoMo-Al2O3 catalyst by combination technique of temperature-programmed sulfiding and electron spin resonance (TPS-ESR)",

abstract = "CoMo-Al2O3 catalyst was characterized with a combination technique of temperature-programmed sulfiding (TPS) and electron spin resonance (ESR). The behavior of the MoO3 loaded over the surface of Al2O3 obtained from TPS has been compared with that of Mo5+ observed with ESR at isothermal and elevated temperatures. The Mo6+ in the MoO3 supported is easily reduced with H2S+H2 under very mild conditions and transformed into Mo5+ as an intermediate. This Mo5+ peak drastically decreased around 200°C with H2S desorption, and H2 consumption appeared simultaneously in the TPS profile. These results suggest that the Mo5+ species observed with ESR associates with sulfur from H2S.",

author = "Eiji Hayashi and Eiji Iwamatsu and Shakeel Ahmed and Lee, \{Augustine K.K.\} and Halim Hamid and Yuzo Sanada and Toshikazu Yoneda",

year = "1998",

doi = "10.1627/jpi1958.41.222",

language = "English",

volume = "41",

pages = "222--225",

journal = "Sekiyu Gakkaishi (Journal of the Japan Petroleum Institute)",

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publisher = "Japan Petroleum Institute",

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T1 - Characterization of CoMo-Al2O3 catalyst by combination technique of temperature-programmed sulfiding and electron spin resonance (TPS-ESR)

AU - Hayashi, Eiji

AU - Iwamatsu, Eiji

AU - Ahmed, Shakeel

AU - Lee, Augustine K.K.

AU - Hamid, Halim

AU - Sanada, Yuzo

AU - Yoneda, Toshikazu

PY - 1998

Y1 - 1998

N2 - CoMo-Al2O3 catalyst was characterized with a combination technique of temperature-programmed sulfiding (TPS) and electron spin resonance (ESR). The behavior of the MoO3 loaded over the surface of Al2O3 obtained from TPS has been compared with that of Mo5+ observed with ESR at isothermal and elevated temperatures. The Mo6+ in the MoO3 supported is easily reduced with H2S+H2 under very mild conditions and transformed into Mo5+ as an intermediate. This Mo5+ peak drastically decreased around 200°C with H2S desorption, and H2 consumption appeared simultaneously in the TPS profile. These results suggest that the Mo5+ species observed with ESR associates with sulfur from H2S.

AB - CoMo-Al2O3 catalyst was characterized with a combination technique of temperature-programmed sulfiding (TPS) and electron spin resonance (ESR). The behavior of the MoO3 loaded over the surface of Al2O3 obtained from TPS has been compared with that of Mo5+ observed with ESR at isothermal and elevated temperatures. The Mo6+ in the MoO3 supported is easily reduced with H2S+H2 under very mild conditions and transformed into Mo5+ as an intermediate. This Mo5+ peak drastically decreased around 200°C with H2S desorption, and H2 consumption appeared simultaneously in the TPS profile. These results suggest that the Mo5+ species observed with ESR associates with sulfur from H2S.

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DO - 10.1627/jpi1958.41.222

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