Study of the catalytic activity-semiconductive properties relationship for BaTiO3 and PbTiO3 perovskites, catalysts for methane combustion

Ionel Popescu, Ioan Sǎndulescu, A. Rédey, Ioan Cezar Marcu

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The electrical conductivity of barium and lead perovskites used as catalysts for the total oxidation of methane, has been measured under nitrogen, methane-nitrogen mixture, air and methane-air mixture (reaction mixture) at the catalytic reaction temperature. The two compounds appeared to be p-type semiconductors under air with positive holes as the main charge carriers but became n-type when contacted with methane-nitrogen mixture. Their conductivities differ by 1.5 orders of magnitude as n-type semiconductors and by three orders of magnitude when being p-type semiconductors. These results explained the difference in the catalytic activity encountered on the two solids. The alkane activation was proposed to be related in both cases to the p-type semiconducting properties of the solids, likely through hydrogen abstraction by a surface O- species, forming a CH 3 radical. The overall reaction mechanism on both perovskites can be assimilated to a Mars and van Krevelen mechanism.

Original languageEnglish
Pages (from-to)445-451
Number of pages7
JournalCatalysis Letters
Volume141
Issue number3
DOIs
Publication statusPublished - Mar 2011

Fingerprint

Methane
Catalyst activity
Catalysts
Nitrogen
Semiconductor materials
Air
Alkanes
Barium
Charge carriers
Paraffins
Hydrogen
Lead
Chemical activation
Oxidation
Temperature

Keywords

  • Ba-Ti perovskite
  • Catalytic total oxidation
  • Electrical conductivity
  • Methane
  • Pb-Ti perovskite

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Cite this

Study of the catalytic activity-semiconductive properties relationship for BaTiO3 and PbTiO3 perovskites, catalysts for methane combustion. / Popescu, Ionel; Sǎndulescu, Ioan; Rédey, A.; Marcu, Ioan Cezar.

In: Catalysis Letters, Vol. 141, No. 3, 03.2011, p. 445-451.

Research output: Contribution to journalArticle

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AB - The electrical conductivity of barium and lead perovskites used as catalysts for the total oxidation of methane, has been measured under nitrogen, methane-nitrogen mixture, air and methane-air mixture (reaction mixture) at the catalytic reaction temperature. The two compounds appeared to be p-type semiconductors under air with positive holes as the main charge carriers but became n-type when contacted with methane-nitrogen mixture. Their conductivities differ by 1.5 orders of magnitude as n-type semiconductors and by three orders of magnitude when being p-type semiconductors. These results explained the difference in the catalytic activity encountered on the two solids. The alkane activation was proposed to be related in both cases to the p-type semiconducting properties of the solids, likely through hydrogen abstraction by a surface O- species, forming a CH 3 • radical. The overall reaction mechanism on both perovskites can be assimilated to a Mars and van Krevelen mechanism.

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