Hydrogenation of Carbon Dioxide by Water: Alkali-Promoted Synthesis of Formate

Journal Article · Thu Jul 15 04:00:00 EDT 2010 · Journal of Physical Chemistry Letters

OSTI ID:989163

Hrbek, J; Hoffmann, F M; Yang, Y; Paul, J; White, M G

Conversion of carbon dioxide utilizing protons from water decomposition is likely to provide a sustainable source of fuels and chemicals in the future. We present here a time-evolved infrared reflection absorption spectroscopy (IRAS) and temperature-programmed desorption (TPD) study of the reaction of CO{sub 2} + H{sub 2}O in thin potassium layers. Reaction at temperatures below 200 K results in the hydrogenation of carbon dioxide to potassium formate. Thermal stability of the formate, together with its sequential transformation to oxalate and to carbonate, is monitored and discussed. The data of this model study suggest a dual promoter mechanism of the potassium: the activation of CO{sub 2} and the dissociation of water. Reaction at temperatures above 200 K, in contrast, is characterized by the absence of formate and the direct reaction of CO{sub 2} to oxalate, due to a drastic reduction of the sticking coefficient of water at higher temperatures.

• Research Organization: BROOKHAVEN NATIONAL LABORATORY (BNL)
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 989163
• Report Number(s): BNL--93729-2010-JA; KC0302010
• Journal Information: Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 14 Vol. 1
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION SPECTROSCOPY
CARBON DIOXIDE
DESORPTION
DIRECT REACTIONS
DISSOCIATION
FORMATES
HYDROGENATION
OXALATES
POTASSIUM
PROMOTERS
PROTONS
REFLECTION
STABILITY
SYNTHESIS
TRANSFORMATIONS
WATER