Results 1 - 2 of 2
Results 1 - 2 of 2. Search took: 0.015 seconds
|Sort by: date | relevance|
[en] A flow injection analysis study was made for the potentiometric selectivity of ditertiarybutyldibenzo-21-crown-7 ether for cesium over other alkali metals and alkaline earths. A (PVC) matrix membrane incorporating the crown ether as ionophore was coated on the tip of a silver wire incorporated in a flow cell. No selectivity for cesium over rubidium was observed. Low selectivity over potassium (KCsK=0.3) and very high selectivity over sodium, lithium, strontium, calcium and magnesium was found. A comparison between two plasticizers, o-nithophenyloctyl ether (NPOE) and o-nitro-phenylpentyl ether (NPPE'), was made when these two plasticizers were used in the electrode matrix. It is shown that the use of NPPE' has a large effect on improving the linearity of the cesium calibration curve, by increasing its slope and enhancing the potentiometric FIA signal. It was also found that, with the exception of rubidium and potassium, the selectivity of cesium over the other metals studied was enhanced by the use of the NPPE' plasticizer
[en] Highlights: • An automated search for reaction systems suitable for thermochemical energy storage was performed. • Algorithm to build reaction systems for thermochemical energy storage is presented. • Close to 1000 possible reaction systems for 5 different reactive gases were found. • The VIENNA TCES-database for thermochemical energy storage materials is presented. - Abstract: Thermochemical energy storage (TCES) is considered as an emerging green technology for increased energy utilization efficiency, thereby achieving a reduction of greenhouse gases. Various reaction systems based on different substance classes (e.g. hydrates, hydroxides, oxides) were suggested and investigated so far. Nevertheless, the number of know reactions which are suitable is still limited, as the main focus concentrates on the investigation of a handful known substances, their further improvement or applicability. To find novel promising candidates for thermochemical energy storage and also to allow for a broader view on the topic, this work present a systematic search approach for thermochemical storage reactions based on chemical databases. A mathematical search algorithm identifies potential reactions categorized by the reactant necessary for the reaction cycle and ranked by storage density. These candidates are listed in the online available VIENNA TCES-database, combined with experimental results, assessing the suitability of these reactions regarding of e.g. decomposition/recombination temperature, reversibility, cycle stability, etc.