No abstract

SUMMARYThermochemical two-step methane reforming, involving the reduction of metal oxide with methane to produce syngas and the oxidation of the reduced metal oxide with water vapor to produce pure hydrogen, was investigated over a Cuferrite/ZrO 2 (CFZ) medium, as a reactant for the redox reaction. To improve the reactivity of the CFZ medium, we considered the addition of Ni or Ce additive to the medium. The reduction behavior of the media in the syngas production step was examined by temperature-programmed reduction method. The reaction characteristics of the media by varying Ni or Ce additive content was evaluated in fixed bed reaction system with infrared heating under the temperature range of 700$9001C. In addition, the repeated cyclic tests were performed to determine durability of the media.

No abstract

The Ni 0.5 Zn 0.5 Fe 2 O 4 nanoparticles about 30 nm were prepared using sol-gel method with metal nitrates dissolved in 2-methoxyathanol. The concentrations of the metal nitrates are adjusted from 0.1 to 0.75 M in order to study the influence on the structural and magnetic properties. The structure and morphology characterization revealed that the crystallinity was improved and the nanoparticle size was increased with the nutrition solution concentrations up to 0.5 M. Degraded crystallinity together with decreased nanoparticle size were observed for concentration of 0.75 M. The saturation magnetization at room temperature reached maximum at 0.5 M, which can be explained by considering the crystallinity and size effect.