Preparation and Physicochemical Characterization of Cadmium and Zinc Ferrocyanides as Catalysts and Ion Exchangers | ||||
| Egyptian Journal of Chemistry | ||||
| Article 2, Volume 59, Issue 5, October 2016, Page 687-700 PDF (864.14 K) | ||||
| DOI: 10.21608/ejchem.2016.1444 | ||||
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| Abstract | ||||
| CADMIUM and zinc ferrocyanide complexes were prepared then
calcined at 100, 400, 600 and 800 °C. The obtained solids were characterized using IR, XRD, N2-adsorption measurements, H2O2 decomposition, and isopropanol conversion. The results showed that the diffractograms of ZnFeCN calcined at 600 -800°C consisted of ZnO, K2FeO4, ZnFe2O4, K2O-Fe2O3 phases while the CdFCN complexes calcined at 600-800°C composed of K2CdO2, K2Cd2O3, K2FeO4, K2O-Fe2O3 phases and Fe2O3 (Maghemite phase). The SBET of CdFeCN and ZnFeCN compounds were small and decrease with increasing the calcination temperature. CdFeCN and ZnFeCN are ion exchangers for 137Cs+-removal. The exchange of ion capacity remained almost unaffected by changing the concentration of HNO3 within 0.05-0.5M. The increase in the acid concentration above this limit brought about a significant decrease in the exchange of ion capacity. The decrease was however more pronounced in case of ZnFeCN complex. The catalytic activity of cadmium and zinc ferrocyanide complexes heated at100°C and 600 °C towards H2O2 decomposition was very small, while the complexes calcined at 800°C °C behaved as active catalysts. The catalytic activity of cadmium and zinc ferrocyanide complexes was moderate towards alcohol conversion and increased by increasing the calcination temperature. The increase was however much more pronounced in case of CdFeCN which shows better activity than ZnFeCN. CdFeCN and ZnFeCN acted mainly as dehydrogenation catalysts (above 90%). | ||||
| Keywords | ||||
| Cadmium ferrocyanide; Zinc ferrocyanide; Cs-ions extraction; Catalytic activity | ||||
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