Fluorescent properties of Eu(III) in the bulk- and nanocrystals of coordination polymer, Eu[Co(CN)6]·4H2O, were compared with those of EuCl3·6H2O. Fluorescent intensity of bulk crystals was greatly enhanced on forming the coordination polymer, whereas that of nanocrystals was little affected. These results were discussed considering the coordination surroundings around Eu(III) located on the crystal surface.
A windowed internally circulating fluidized bed reactor was tested using m-ZrO2-supported NiFe2O4(NiFe2O4/m-ZrO2) particles as redox material for thermochemical two-step water splitting to produce hydrogen from water. The internally circulating fluidized bed of NiFe2O4/m-ZrO2 particles is directly heated by solar-simulated Xe light irradiation through a transparent quartz window mounted on top of the reactor. A sun simulator with three Xe lamps at laboratory scale has been newly installed in our laboratory for testing the fluidized bed reactor. The input power of incident Xe light can be scaled up to 2.6 kWth. Temperature distributions within the fluidized bed are measured under concentrated Xe light irradiation with an input power of 2.6 kWth. Hydrogen productivity and reactivity for the fluidized bed of NiFe2O4/m-ZrO2 particles are examined using two different reactors under the N2 flow rate and flow ratio, which yield a higher bed temperature. The feasibility of successive two-step water splitting using the fluidized bed reactor is examined by switching from N2 gas flow in the thermal reduction step to a steam/N2 gas mixture in the water decomposition step. It is confirmed that hydrogen production takes place in the single fluidized bed reactor by successive two-step water splitting.
Iron I 7100 New High-Yield Preparation Procedure of Ln[Fe(CN) 6 ]·nH 2 O (Ln: La, Gd, and Lu) and Their Thermal Decomposition into Perovskite-Type Oxides. -The title compounds are synthesized by mixing MeOH solutions of equimolar amounts of (NH4)3[Fe(CN)6] and Ln(NO3)3 (20°C, continuous stirring, a few min, 88-92% yield). The samples are characterized by XRD and thermogravimetry. Thermal decomposition of the prepared Ln[Fe(CN) 6 ]·nH 2 O (Ln: La, Gd, and Lu) complexes yields single phase LnFeO3. -(KONDO, N.; ITOH, H.; KURIHARA, M.; SAKAMOTO, M.; AONO*, H.; SADAOKA, Y.; J. Alloys Compd. 408-412 (2006) 1026-1029; Dep. Mater. Sci. Eng., Fac. Eng., Ehime Univ., Matsuyama, Ehime 790, Japan; Eng.) -W. Pewestorf 22-021
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