High Efficient Autothermal Reforming by using Micro-structured Reactor

微反应器中的水蒸气重整、部分氧化和自热重整被认为是小型燃料电池的制氢过程。自热重整具有无需供热、启动时间短等优点。然而，反应器入口处的局部温度升高是个问题。本研究的目的是开发氧气单独供给的微反应器。研究了微结构催化剂的制备方法，探索了适用于自热重整反应的催化剂，并在不锈钢微反应器中制作了“U”形微空间，将微结构催化剂嵌入反应器中。在这项研究中，商业CuZuAl催化剂用于甲醇或二甲醚（DME）重整。将催化剂与溶胶-凝胶法合成的硅溶胶混合后，将由10个尺寸约为1 mm的微通道组成的微结构干燥、煅烧并形成微结构催化剂。甲醇的重整反应温度略高于工业催化剂，并在高供氧条件下进行了甲烷和二甲醚水蒸气重整反应。结果表明，Rh负载的Ce_<0.15>Zr_<0.85>O_2催化剂性能最好。

Steam reforming, partial oxidation and autothermal reforming in microreactor were considered as a hydrogen production process for the small-sized fuel cell. Autothermal reforming has some merits such as no heat supply and short start-up time. However, rise in local temperature at the entrance of the reactor is problem. The objective of this study was to develop the microreactor to which oxygen gas was a supplied separately. The preparation method for micro-structured catalyst was developed and the suitable catalyst for autothermal reforming was investigated.In order to insert the micro-structured catalysts in the microreactor made from stainless steel, the micro space with parallelogram shape was fabricated. In this study, commercial CuZuAl catalyst was used for the reforming of methanol or dimethyl ether (DME). After mixing the catalyst with the silica sol synthesized by sol gel method, the micro structure which consists of 10 microchannels of approximately 1mm size was dried, calcined and formed to the micro-structured catalyst. The reforming temperature of methanol for the micro-structured catalyst is slightly higher than that for the commercial catalyst.The steam reforming of methane and DME was carried out on the precious metal loaded ceria-zirconia catalysts with high oxygen supply. It is found that Rh loaded Ce_<0.15>Zr_<0.85>O_2 catalyst indicated the best performance.