Oxygenates from syngas over highly dispersed cobalt catalysts

Conference · Tue Oct 01 04:00:00 EDT 1996

OSTI ID:370710

Matsuzaki, T; Hanaoka, Taka-aki ^[1]

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1. National Institute of Materials and Chemical Research, Ibaraki (Japan)

Silica-supported cobalt catalysts derived from cobalt (II) acetate were active for the formation of oxygenates in the CO hydrogenation by the modification with noble metals such as Ir, Ru, Rh, Pt, Re, Os, etc. However, CO/SiO{sub 2} catalyst derived from CO{sub 2} (CO){sub 8} was also active for oxygenate formation without any modification. From characterizations of the catalysts by XPS, EXAFS, XRD, etc., the noble metals promote the reduction of highly dispersed CO{sub 2}{sup +} particles to metallic by a spillover hydrogen activated on the noble metal sites, and the main active site of the catalysts for the formation of the oxygenates is revealed to be highly dispersed cobalt metal articles. The selectivity of oxygenates, especially C{sub 2}-oxygenates such as ethanol, acetalyclehyde and acetic acid, were strongly enhanced by a further modification with basic additives such as alkali, alkaline earth and rare earth cations. These basic additives may control electronic and dispersive states of cobalt particles. Mechanism of the catalysis will be discussed.

• OSTI ID: 370710
• Report Number(s): CONF-960376--
• Country of Publication: United States
• Language: English

Related Subjects

10 SYNTHETIC FUELS
ACETALDEHYDE
ACETIC ACID
ADDITIVES
CATALYTIC EFFECTS
COBALT
CONTROL
CONVERSION
ETHANOL
FUEL ADDITIVES
HYDROGENATION
SILICA
SYNTHESIS
SYNTHESIS GAS