Determination of Adsorption enthalpies and entropies of Inorganic Halides by Temperature Programmed Gas Chromatography

摘要

The possibilities of using temperature-programmed gas-solid chromatography·for the determination ofadsorption enthalpies and entropies of inorganic chlorides areinvestigated. This method is suitable, if data oflimited accuracy are acceptable, whereasfor more precise data isothermal gas chromatography is recommended. The advantageof temperature-programmed experiments is that simultaneous investigationscan be made ofcompounds with very different volatilities. The results of these investigationssupport the picture of "surface complexes" bet\veen the adsorbed molecules(metal halides or oxyhalides, e.g., ReCls _ SnCl.s, PoCl.s. etc.) and the adsorbent (alkalimetal halides. SiO.!).