Oxidative Coupling of Methane on Oxygen-Semipermeable Yttria-Doped Bismuth Oxide Ceramics in a Reducing Atmosphere

Y. Zeng, Jerry Lin

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Oxidative coupling of methane (OCM) on oxygen-semipermeable δ-phase 25 mol % Y2O3/Bi2O3 (BY25) in a reducing (methane) atmosphere was studied by measuring transient catalytic properties and weight change of the ceramics when exposed to a methane stream at high temperatures (>800°C). Compared to the results obtained in a fixed-bed reactor operated in the cofeed mode, BY25 ceramics in a pellet form exhibit extremely high C2 selectivity (94%) and appreciable reactivity (C2 formation rate of 0.7 μmol/g·s for OCM in a highly reducing methane atmosphere. Experimental results are also reported to show the effects of temperature, flow rate, methane exposure time, helium purge time, and helium to methane ratio on catalytic properties of BY25 pellets in a methane atmosphere. The results indicate that BY25 ceramic membrane materials possess desired catalytic properties for OCM membrane reactor applications.

Original languageEnglish (US)
Pages (from-to)277-283
Number of pages7
JournalIndustrial and Engineering Chemistry Research
Volume36
Issue number2
StatePublished - Feb 1997
Externally publishedYes

Fingerprint

Yttrium oxide
bismuth
Methane
Bismuth
ceramics
methane
oxide
Oxygen
oxygen
Oxides
atmosphere
Helium
helium
membrane
bismuth oxide
yttria
Ceramic membranes
Flow rate
Membranes
Temperature

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Environmental Science(all)
  • Polymers and Plastics

Cite this

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abstract = "Oxidative coupling of methane (OCM) on oxygen-semipermeable δ-phase 25 mol {\%} Y2O3/Bi2O3 (BY25) in a reducing (methane) atmosphere was studied by measuring transient catalytic properties and weight change of the ceramics when exposed to a methane stream at high temperatures (>800°C). Compared to the results obtained in a fixed-bed reactor operated in the cofeed mode, BY25 ceramics in a pellet form exhibit extremely high C2 selectivity (94{\%}) and appreciable reactivity (C2 formation rate of 0.7 μmol/g·s for OCM in a highly reducing methane atmosphere. Experimental results are also reported to show the effects of temperature, flow rate, methane exposure time, helium purge time, and helium to methane ratio on catalytic properties of BY25 pellets in a methane atmosphere. The results indicate that BY25 ceramic membrane materials possess desired catalytic properties for OCM membrane reactor applications.",
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AB - Oxidative coupling of methane (OCM) on oxygen-semipermeable δ-phase 25 mol % Y2O3/Bi2O3 (BY25) in a reducing (methane) atmosphere was studied by measuring transient catalytic properties and weight change of the ceramics when exposed to a methane stream at high temperatures (>800°C). Compared to the results obtained in a fixed-bed reactor operated in the cofeed mode, BY25 ceramics in a pellet form exhibit extremely high C2 selectivity (94%) and appreciable reactivity (C2 formation rate of 0.7 μmol/g·s for OCM in a highly reducing methane atmosphere. Experimental results are also reported to show the effects of temperature, flow rate, methane exposure time, helium purge time, and helium to methane ratio on catalytic properties of BY25 pellets in a methane atmosphere. The results indicate that BY25 ceramic membrane materials possess desired catalytic properties for OCM membrane reactor applications.

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