Catalytic behavior of O2-pretreated Ni3(SbTe3)2 catalyst in oxidative coupling of methane

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

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Amorphous Ni3(SbTe3)2 was prepared from a metathesis between K3SbTe3 and NiBr2 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 CH4/O2/He in the temperature range of 600-750 °C. Although amorphous Ni3(SbTe3)2 showed no catalytic activity for the oxidative coupling of methane, the O2-pretreated Ni3(SbTe3)2 was found to be active and selective for the reaction. Its C2 selectivities were in the range of 45-79% in the temperature range of 600-750 °C. The best C2-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 O2-treated Ni3(SbTe3)2 catalyst before and after the catalytic reaction to characterize the catalyst. Thermogravimetry (TG) analysis was performed for amorphous Ni3(SbTe3)2 in a flow of O2/Ar mixture. Electrical conductivity of amorphous Ni3(SbTe3)2 was measured as a function of temperature in the range of 400-800°C at both PO2's of 0.01 and 0.20 atm. The results suggest that NiTeO3 formed on the surface by the O2-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

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology

Fingerprint Dive into the research topics of 'Catalytic behavior of O<sub>2</sub>-pretreated Ni<sub>3</sub>(SbTe<sub>3</sub>)<sub>2</sub> catalyst in oxidative coupling of methane'. Together they form a unique fingerprint.

  • Cite this