Catalytic behavior of O 2 -pretreated Ni 3 (SbTe 3 ) 2 catalyst in oxidative coupling of methane

Sung Han Lee, Jin Seung Jung, Jae Uk Joo, No Seung Myung, Jong Ho Jun, Joong-Gill Choi

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Abstract

Amorphous Ni 3 (SbTe 3 ) 2 was prepared from a metathesis between K 3 SbTe 3 and NiBr 2 solution and was examined as a catalyst for the oxidative coupling of methane in a single-pass flow reactor system using on-line gas chromatography at atmospheric pressure. Catalytic reaction was performed by feeding the reaction mixture containing CH 4 /O 2 /He in the temperature range of 600-750 °C. Although amorphous Ni 3 (SbTe 3 ) 2 showed no catalytic activity for the oxidative coupling of methane, the O 2 -pretreated Ni 3 (SbTe 3 ) 2 was found to be active and selective for the reaction. Its C 2 selectivities were in the range of 45-79% in the temperature range of 600-750 °C. The best C 2 -yield was 11% with a selectivity of 79% at 650 °C. X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses were performed for the O 2 -treated Ni 3 (SbTe 3 ) 2 catalyst before and after the catalytic reaction to characterize the catalyst. Thermogravimetry (TG) analysis was performed for amorphous Ni 3 (SbTe 3 ) 2 in a flow of O 2 /Ar mixture. Electrical conductivity of amorphous Ni 3 (SbTe 3 ) 2 was measured as a function of temperature in the range of 400-800°C at both P O2 's of 0.01 and 0.20 atm. The results suggest that NiTeO 3 formed on the surface by the O 2 -pretreatment of catalyst is active and is the selective phase for the oxidative coupling of methane.

Original languageEnglish
Pages (from-to)91-101
Number of pages11
JournalApplied Catalysis A: General
Volume237
Issue number1-2
DOIs
Publication statusPublished - 2002 Nov 1

Fingerprint

Methane
Catalysts
Online systems
Gas chromatography
X ray powder diffraction
Temperature
Atmospheric pressure
Thermogravimetric analysis
Catalyst activity
X ray photoelectron spectroscopy

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology

Cite this

Lee, Sung Han ; Jung, Jin Seung ; Joo, Jae Uk ; Myung, No Seung ; Jun, Jong Ho ; Choi, Joong-Gill. / Catalytic behavior of O 2 -pretreated Ni 3 (SbTe 3 ) 2 catalyst in oxidative coupling of methane In: Applied Catalysis A: General. 2002 ; Vol. 237, No. 1-2. pp. 91-101.
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Catalytic behavior of O 2 -pretreated Ni 3 (SbTe 3 ) 2 catalyst in oxidative coupling of methane . / Lee, Sung Han; Jung, Jin Seung; Joo, Jae Uk; Myung, No Seung; Jun, Jong Ho; Choi, Joong-Gill.

In: Applied Catalysis A: General, Vol. 237, No. 1-2, 01.11.2002, p. 91-101.

Research output: Contribution to journalArticle

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T1 - Catalytic behavior of O 2 -pretreated Ni 3 (SbTe 3 ) 2 catalyst in oxidative coupling of methane

AU - Lee, Sung Han

AU - Jung, Jin Seung

AU - Joo, Jae Uk

AU - Myung, No Seung

AU - Jun, Jong Ho

AU - Choi, Joong-Gill

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N2 - Amorphous Ni 3 (SbTe 3 ) 2 was prepared from a metathesis between K 3 SbTe 3 and NiBr 2 solution and was examined as a catalyst for the oxidative coupling of methane in a single-pass flow reactor system using on-line gas chromatography at atmospheric pressure. Catalytic reaction was performed by feeding the reaction mixture containing CH 4 /O 2 /He in the temperature range of 600-750 °C. Although amorphous Ni 3 (SbTe 3 ) 2 showed no catalytic activity for the oxidative coupling of methane, the O 2 -pretreated Ni 3 (SbTe 3 ) 2 was found to be active and selective for the reaction. Its C 2 selectivities were in the range of 45-79% in the temperature range of 600-750 °C. The best C 2 -yield was 11% with a selectivity of 79% at 650 °C. X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses were performed for the O 2 -treated Ni 3 (SbTe 3 ) 2 catalyst before and after the catalytic reaction to characterize the catalyst. Thermogravimetry (TG) analysis was performed for amorphous Ni 3 (SbTe 3 ) 2 in a flow of O 2 /Ar mixture. Electrical conductivity of amorphous Ni 3 (SbTe 3 ) 2 was measured as a function of temperature in the range of 400-800°C at both P O2 's of 0.01 and 0.20 atm. The results suggest that NiTeO 3 formed on the surface by the O 2 -pretreatment of catalyst is active and is the selective phase for the oxidative coupling of methane.

AB - Amorphous Ni 3 (SbTe 3 ) 2 was prepared from a metathesis between K 3 SbTe 3 and NiBr 2 solution and was examined as a catalyst for the oxidative coupling of methane in a single-pass flow reactor system using on-line gas chromatography at atmospheric pressure. Catalytic reaction was performed by feeding the reaction mixture containing CH 4 /O 2 /He in the temperature range of 600-750 °C. Although amorphous Ni 3 (SbTe 3 ) 2 showed no catalytic activity for the oxidative coupling of methane, the O 2 -pretreated Ni 3 (SbTe 3 ) 2 was found to be active and selective for the reaction. Its C 2 selectivities were in the range of 45-79% in the temperature range of 600-750 °C. The best C 2 -yield was 11% with a selectivity of 79% at 650 °C. X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses were performed for the O 2 -treated Ni 3 (SbTe 3 ) 2 catalyst before and after the catalytic reaction to characterize the catalyst. Thermogravimetry (TG) analysis was performed for amorphous Ni 3 (SbTe 3 ) 2 in a flow of O 2 /Ar mixture. Electrical conductivity of amorphous Ni 3 (SbTe 3 ) 2 was measured as a function of temperature in the range of 400-800°C at both P O2 's of 0.01 and 0.20 atm. The results suggest that NiTeO 3 formed on the surface by the O 2 -pretreatment of catalyst is active and is the selective phase for the oxidative coupling of methane.

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