This study presents the effective thermal design concept of exothermic Sabatier reactor, which shall convert carbon dioxide with hydrogen to produce water and methane (so-called “methanation”) assisted by the catalytic activity. Pellet type of Ru-based catalyst is packed in the preheated reactor tube and stoichiometric reactant gas mixture (CO2 and H2) flows at the prescribed flow rate. By employing the present system, steady 1-D reaction field is successfully achieved. Bundled thermocouples are inserted from the downstream through the sealed yet movable connectors to obtain the steady-state temperature profile in the reactor. End gas is analyzed by gas chromatography to check the conversion performance. The following two series of reactor are tested; it has (1) uniform or (2) stepwise catalyst distribution. By using uniform catalyst bed, relatively strong peak in the temperature profile is appeared at the inlet and thermal damage of catalyst is highly expected to lose the durability. No significant improvement on reduction of the peak as well as the conversion performance even when the shorter heating regime is employed, although the peak location moves to downstream. Adopting the non-uniform (stepwise) catalyst distribution are effectively modifying the thermal structure in the reactor having the less-peak in the temperature profile without losing the conversion performance. Our study reveals the control of catalyst distribution is simple yet effective approach to achieve the uniform temperature profile even in 1-D flow reactor design at high conversion performance. The reactor temperature profile was achieved to be uniform by adopting stepwise catalyst distribution to prevent hot spots in the Sabatier reactor.

中文翻译：

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通过控制催化剂分布曲线实现 Sabatier 反应器的有效热设计概念

本研究提出了放热 Sabatier 反应器的有效热设计概念，该反应器应在催化活性的辅助下将二氧化碳与氢气转化为水和甲烷（所谓的“甲烷化”）。颗粒型 Ru 基催化剂填充在预热的反应器管中，化学计量的反应气体混合物（CO2 和 H2）以规定的流速流动。通过使用本系统，成功地实现了稳定的一维反应场。捆绑的热电偶从下游通过密封但可移动的连接器插入，以获得反应器中的稳态温度分布。通过气相色谱分析尾气以检查转化性能。测试了以下两个系列的电抗器；它具有 (1) 均匀或 (2) 阶梯式催化剂分布。通过使用均匀的催化剂床，入口处出现相对较强的温度曲线峰值，催化剂的热损伤很可能会失去耐久性。即使采用较短的加热方式，峰值的降低和转化性能也没有显着改善，尽管峰值位置移动到下游。采用非均匀（阶梯式）催化剂分布可以有效地改变反应器中温度曲线中具有较小峰值的热结构，而不会损失转化性能。我们的研究表明，即使在具有高转化性能的一维流动反应器设计中，催化剂分布的控制也是实现均匀温度分布的简单而有效的方法。