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首页> 外文会议>ASME(American Society of Mechanical Engineers) Energy Sustainability Conference; 20070627-30; Long Beach,CA(US) >FABRICATION OF POROUS CALCIUM OXIDE FILM FOR UT-3 THERMOCHEMICAL HYDROGEN PRODUCTION CYCLE
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FABRICATION OF POROUS CALCIUM OXIDE FILM FOR UT-3 THERMOCHEMICAL HYDROGEN PRODUCTION CYCLE

机译：UT-3热化学制氢循环中多孔氧化钙膜的制备

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UT-3 thermochemical hydrogen production cycle has been studied, both theoretically and experimentally, and is one of the very few cycles studied on a pilot plant scale. The maximum operating temperature in this cycle is relatively lower than the temperatures in other cycles. Another advantage of this cycle is that it is comprised of four gas-solid reactions which simplify product separation. Although the cycle has several such advantages, one of the significant issues is the development of solid reactants that are chemically reactive and physically stable in cyclic operations between oxide and bromide forms, which have considerably different molar volumes. Acceleration of reaction rate as well as longer cyclic life time and durability of the solid reactant are important keys for the practicability of the cycle. Additionally, a simpler preparation step of the reactant is preferable. Therefore, in order to increase the surface area of the calcium oxide reactant and maintain reactivity as well as structure in cyclic transformations, porous calcium oxide films have been examined as candidates. The calcium oxide precursor was prepared by sol-gel chemistry following a metal alkoxide process and the film was fabricated by a dip coating procedure. The characterization of the calcium oxide film such as the structural changes in the film and compositional conversions due to the bromination reaction has been performed using SEM and EDS. Based on a preliminary experimental analysis as well as the advantages of a film type reactant, one can conclude that the calcium oxide film may be a feasible alternative to a pellet-type reactant.
机译：UT-3热化学制氢循环已在理论和实验上进行了研究，并且是在中试规模下研究的极少数循环之一。该循环中的最高工作温度相对低于其他循环中的温度。该循环的另一个优点是它包含四个气固反应，可简化产物分离。尽管该循环具有几个这样的优点，但是重要的问题之一是开发出固体反应物，该固体反应物在氧化物和溴化物形式之间的循环操作中具有化学反应性和物理稳定性，其摩尔体积明显不同。反应速率的提高以及更长的循环寿命和固体反应物的耐久性是循环实用性的重要关键。另外，优选反应物的制备步骤更简单。因此，为了增加氧化钙反应物的表面积并保持反应性以及循环转化中的结构，已经研究了多孔氧化钙膜作为候选物。在金属醇盐工艺之后，通过溶胶-凝胶化学制备氧化钙前体，并通过浸涂程序制造膜。已经使用SEM和EDS进行了氧化钙膜的表征，例如膜的结构变化和由于溴化反应引起的组成转化。基于初步的实验分析以及薄膜型反应物的优势，可以得出结论，氧化钙薄膜可能是颗粒型反应物的可行替代品。

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