Stability and surface catalytic properties of fluorite-structured yttria-doped bismuth oxide under reducing environment

Y. Zeng, Jerry Lin

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

High temperature stability and catalytic properties of fluorite-type 25 mol% Y2O3 doped Bi2O3 (BY25) pellets under methane atmosphere were studied by XRD, transient TGA and fixed-bed reactor measurements. In methane the fluorite-type BY25 exhibits good catalytic properties for oxidative coupling of methane (OCM) with C2 selectivity higher than 90% and C2 formation rate in the range of 1-3 μmol/g·s. BY25 maintains its fluorite-type phase structure and catalytic properties as long as only nonstoichiometric oxygen in BY25 is consumed (less than 20% of the total oxygen). Prolonged (>5-7 min) exposure of BY25 to methane results in consumption of stoichiometric oxygen, leading to reduction of metal ions and destruction of the fluorite structure of BY25. These results suggest that the stability and catalytic properties of the surface of the BY25 membrane exposed to methane stream in membrane reactor applications can be maintained if sufficient oxygen is provided from the other side of the membrane.

Original languageEnglish (US)
Pages (from-to)30-36
Number of pages7
JournalJournal of Catalysis
Volume182
Issue number1
StatePublished - 1999
Externally publishedYes

Fingerprint

bismuth oxides
Yttrium oxide
Fluorspar
Methane
fluorite
Bismuth
methane
Oxides
Oxygen
oxygen
membranes
Membranes
reactors
Phase structure
pellets
destruction
Metal ions
beds
metal ions
selectivity

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Stability and surface catalytic properties of fluorite-structured yttria-doped bismuth oxide under reducing environment. / Zeng, Y.; Lin, Jerry.

In: Journal of Catalysis, Vol. 182, No. 1, 1999, p. 30-36.

Research output: Contribution to journalArticle

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