Catalytic roles of Co0 and Co2+ during steam reforming of ethanol on Co/MgO catalysts

Journal Article · Fri Feb 25 04:00:00 EST 2011 · ACS Catalysis, 1(4):279-286

DOI:https://doi.org/10.1021/cs200014j· OSTI ID:1012852

Karim, Ayman M; Su, Yu; Engelhard, Mark H; King, David L; Wang, Yong

Abstract: The catalytic roles of Co0 and Co2+ during steam reforming of ethanol were investigated over Co/MgO catalysts. Catalysts with different Co0/(Co0+Co2+) fraction were prepared through calcination and/or reduction at different temperatures, and the Co0 fraction was quantified by TPR and in-situ XPS. High temperature calcination of Co/MgO allowed us to prepare catalysts with more non-reducible Co2+ incorporated in the MgO lattice, while lower calcination temperatures allowed for the preparation of catalysts with higher Co0/(Co0+Co2+) fractions. The catalytic tests on Co0, non-reducible Co2+, and reducible Co2+ indicated that Co0 is much more active than either reducible or non-reducible Co2+ for C-C cleavage and water gas shift reaction. In addition, catalysts with a higher Co0 surface fraction exhibited a lower selectivity to CH4.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1012852
• Report Number(s): PNNL-SA-77941; 42292; EB4201000
• Journal Information: ACS Catalysis, 1(4):279-286, Journal Name: ACS Catalysis, 1(4):279-286 Journal Issue: 4 Vol. 1; ISSN 2155-5435
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CATALYTIC EFFECTS
CHEMICAL PREPARATION
COBALT
COBALT COMPOUNDS
ETHANOL
Environmental Molecular Sciences Laboratory
MAGNESIUM OXIDES
SHIFT PROCESSES
STEAM REFORMER PROCESSES
WATER GAS PROCESSES