Competitive Adsorption Study of CO2 and SO2 on CoII3[CoIII(CN)6]2 Using DRIFTS

Journal Article · Wed Sep 15 04:00:00 EDT 2010 · Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy, 77(1):287–291

DOI:https://doi.org/10.1016/j.saa.2010.05.024· OSTI ID:1000622

Windisch, Charles F; Thallapally, Praveen K; McGrail, B Peter

Diffuse reflectance infrared Fourier transform spectroscopy was used to study the competitive adsorption of CO2 and SO2 on the cobalt Prussian blue analogue CoII3[CoIII(CN)6]2 at 298 K. Characteristic peaks for adsorbed CO2 and SO2 species were identified and their relative areas, measured simultaneously as a function of pressure at 298 K, varied in accordance with a Langmuir-Freundlich isotherm fitted to both gases in the low-coverage Henry’s Law limit. Evidence for co-adsorption of trace water was also obtained, as well as the apparent formation of an analogous cobalt nitroprusside compound as a reaction product under certain conditions. The several aspects of the adsorption of CO2 and SO2 on CoCo determined in this work point to an important role for real-time diffuse reflectance infrared measurements in adsorption studies, particularly in the case of competitive adsorption where the occurrence and fate of molecular-level markers arising from more than one adsorbed species can be monitored simultaneously. Depending on the application, this may more than offset certain quantitative limitations of the technique that confine measurements to a relatively narrow set of experimental conditions and demand careful consideration of the effects of sample preparation and treatment.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1000622
• Report Number(s): PNNL-SA-71661; AA3010000
• Journal Information: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy, 77(1):287–291, Journal Name: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy, 77(1):287–291 Journal Issue: 1 Vol. 77; ISSN 1386-1425
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
ADSORPTION
CARBON DIOXIDE
COBALT
COBALT COMPOUNDS
CYANIDES
Carbon Dioxide
Competitive Adsorption
DRIFTS
Infrared
Reflectance
SAMPLE PREPARATION
SORPTIVE PROPERTIES
SULFUR DIOXIDE
Sulfur Dioxide