Selective methane oxidation over promoted oxide catalysts. Quarterly technical progress report, December 1, 1992--February 28, 1993

Technical Report · Mon Mar 01 04:00:00 EST 1993

DOI:https://doi.org/10.2172/10176531· OSTI ID:10176531

Klier, K; Herman, R G; Sarkany, J; Sun, Q

Sulfate anion was used to modify the surface basicity of 1 wt% Sr/La{sub 2}O{sub 3}, and catalytic tests were carried out to probe the selective oxidation of methane to C{sub 2} coupling products over these catalysts. Over a range of reaction temperatures of 500--700{degrees}C, most of the catalytic tests were carried out with a 1 wt% SO{sub 4} {sup 2{minus}}/1 wt% Sr/La{sub 2}O{sub 3}with a CH{sub 4}/air = 1/1 reactant mixture at 1 atm and with a gas hourly space velocity (GHSV) = 70,000 {ell}/kg catal/hr. The sulfated catalyst showed the largest improved catalytic effect at 500{degrees}C. Compared to the activity of the nonsulfated Sr/La{sub 2}O{sub 3}, the sulfated catalyst resulted in enhancement of the methane conversion, the C{sub 2} selectivity, and the yield of C{sub 2} products. In situ laser Raman spectroscopy was used to characterize the surface of sulfated and nonsulfated catalysts. Preliminary results indicate that the sulfate anion preferentially bonded to the Sr rather than to the La ions. The promoting effect of the acidic sulfate on the catalytic activity of basic Sr/La{sub 2}O{sub 3} seems to be due to the inhibition of carbonate formation on the surface Sr ions.

• Research Organization: Lehigh Univ., Bethlehem, PA (United States). Zettlemoyer Center for Surface Studies
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG21-92MC29228
• OSTI ID: 10176531
• Report Number(s): DOE/MC/29228--3407; ON: DE93040002
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010408
10 SYNTHETIC FUELS
100200
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201
AIR
C1 PROCESSES
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES
FORMALDEHYDE
LANTHANUM OXIDES
METHANE
METHANOL
OXIDATION
OXYGEN
PRODUCTION
PROGRESS REPORT
PROMOTERS
RAMAN SPECTRA
STRONTIUM
SULFATES
TEMPERATURE DEPENDENCE