Investigation of MMT adsorption on soils by Diffuse Reflectance Infrared Spectroscopy (DRIFTS) and Headspace Analysis Gas-phase Infrared Spectroscopy (HAGIS)
✍ Scribed by Andrew J. Vreugdenhil; Ian S. Butler
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 100 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0268-2605
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✦ Synopsis
Diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) and headspace analysis gas-phase infrared spectroscopy (HAGIS) were used to investigate interactions between soils and the gasoline additive methylcyclopentadienylmanganese tricarbonyl (MMT). Various soil samples, as well as alumina and silica substrates, were studied. Each substrate exhibited a splitting or broadening of the degenerate e (CO) band of MMT, suggesting an interaction involving one or two of the CO ligands. The adsorption was shown to be reversible under relatively mild conditions using HAGIS. The proposed interaction is of the Brønsted type, involving the carbonyl oxygen and a surface-bound water or hydroxyl group. This type of interaction could stabilize MMT by inhibiting photoejection of CO ligands, a common first step in the decomposition of organometallic carbonyl compounds such as MMT.