Catalytic combustion of methane in simulated PSA offgas over Mn-substituted La-Sr-hexaaluminate (LaxSr1-xMnAl11O 19)

Seongmin Kim, Dae Won Lee, Joon Yeob Lee, Hee Jun Eom, Hwa Jung Lee, In Ho Cho, Kwan Young Lee

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Mn-substituted La, Sr-hexaaluminate was studied as a catalyst for the catalytic combustion of pressure swing adsorption (PSA) offgas from a hydrogen station based on steam reforming of petroleum gas. The catalytic activity and thermal stability were tested under simulated PSA offgas condition and the catalysts were characterized by X-ray diffraction (XRD), inductively coupled plasma atomic emission spectroscopy (ICP-AES), CO2-temperature programmed desorption (TPD) and N2 physisorption for BET. All the LaxSr1-xMnAl11O19 catalysts prepared by co-precipitation method contained hexaaluminate structure as the major phase after 5 h calcination at 1200 °C. Partial substitution of La for Sr in SrMnAl11O19 increased the specific surface area and consequently the catalytic activity for oxidation of methane. The CO2 in the simulated PSA offgas was found to suppress the catalytic activity in methane oxidation if the catalyst had appreciable surface basicity. The most active catalyst, La0.6Sr0.4MnAl11O 19, retained its lattice structure and chemical composition even after 40-h thermal aging at 1000 °C under PSA offgas composition.

Original languageEnglish
Pages (from-to)60-64
Number of pages5
JournalJournal of Molecular Catalysis A: Chemical
Volume335
Issue number1-2
DOIs
Publication statusPublished - 2011 Feb 1

Keywords

  • Catalytic combustion
  • Hexaaluminate
  • Hydrogen station
  • Methane
  • PSA offgas

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

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