Masatsugu Taneda

The steam reforming (SR) of propane for hydrogen production at 400-600 degrees C in a porous yttria-stabilized zirconia (YSZ) membrane reactor was investigated. The YSZ membrane was used as a hydrogen selective membrane. A Rh-supported Ce0.15Zr0.85O2) catalyst was packed in the membrane reactor because the catalyst was found to be the most suitable catalyst for the low-temperature SR of propane on the basis of the results obtained using a packed bed reactor. The conversion of propane in the membrane reactor was higher than that in a packed bed reactor due to the shift of equilibrium toward the hydrogen-producing side. In spite of relatively low permeation selectivity (ideal H-2/CO selectivity = 9 at 100 degrees C), hydrogen permeation through the membrane Caused an increase in the CO2 fraction and a decrease in the CO fraction in reformed gas. This indicates that the water-gas shift reaction was an important contributor in the product distribution in the membrane reactor. Meanwhile, the methane fraction remained largely unchanged. regardless of selective hydrogen permeation. (C) 2009 Curtin University of Technology and John Wiley & Sons, Ltd.

The direct synthesis of hydrogen peroxide from hydrogen and oxygen was investigated using capillary and stacked microreactors in which the silicone wall of a microchannel had been coated with Pd/C catalyst. To make the H2O2 production system compact, a flow-through solid polymer electrolyte (SPE) electrolyzer, which was used for the H-2- and O-2-feeds instead of gas cylinders, was connected to the microreactor. The influence of the gas and liquid flow rates and of the reaction temperature on H2O2 production was investigated to identify the optimal operating conditions for the stacked microreactor. In the previous study [Kusakabe, K., Kawaguchi, K., Maehara, S. and Taneda, M., 2007, Direct formation of hydrogen peroxide over palladium catalyst based on water electrolysis, J Chem EngJpn, 40: 523-528], direct synthesis of H2O2 over Pd/C catalyst was performed using a slurry batch reactor with two sheets of electrode for H-2 and O-2 evolution. The maximum H2O2 concentration of 3.4 x 10(-3) mol/L was attained after a 3-h reaction. In this study, a H2O2 concentration of 8.3 x 10(-3) mol/L was obtained at 10 degrees C in a 0.1 mol/L solution of HCl at the residence time of 93s in the stacked microreactor. In addition, H2O2 was successfully produced when pure water was used as the reaction liquid with H2 and 02 in the stacked microreactor. (C) 2008 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

N-サリチリデンアニリン類結晶のフォトクロミズム現象の発現には、分子の光異性化を許容する反応空間が結晶内に確保されていることが必要である。本研究では、メソポーラスシリカと種々のN-サリチリデンアニリン類とのハイブリッド化合物を作り、そのクロモトロピズム挙動を考察した。N-サリチリデン-4-ヒドロキシアニリンのメソポーラスシリカ包接体においてフォトクロミズム現象が観測された。メソ孔における光異性化反応場の確保と隣接分子間相互作用を考慮した分子設計が、新規有機-無機ハイブリッドフォトクロミック化合物の創製に重要であることがわかった。サーモクロミズム現象についても考察した。