β Scribed by Olobunmi M. Ogunsola; Norbert Berkowitz
No coin nor oath required. For personal study only.
To examine breakout of heterocyclic sulfur and/or nitrogen from oil precursors during extraction with supercritical water (SCW), six model compounds thought likely to be structural elements of primary coal liquids, bitumens and kerogens were reacted with SCW at 400Β°C and 22 MPa for up to 48 h. Although the experimental conditions may not have been the best, and the reactions were therefore slow as well as limited, the results indicate possibilities for removing significant proportions of heteroatoms during extraction with SCW and for using SCW as a reagent in preparative organic chemistry.
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HF and water delivered using liquid, gas, and supercritical CO 2 phases were used to remove native oxides and suboxides from SiGe surfaces containing 15-30% Ge. X-ray photoelectron spectroscopy was used to monitor the Si 2p and Ge 2p 3/2 peaks as a function of the process type, HF concentration, and