由於發生兩次能源危機導致石油價格上升，發展環保之替代能源為重要的課題，其中氫氣是一種無色、無臭、無味、無毒的可燃性氣體，因此氫能為未來極具發產潛力的能源之一。本文為建立一甲烷催化部分氧化反應（CPOM）產氫之模型，其中以銠（Rh）做為催化劑，碳氧原子比（C/O ratio）分別設定 0.6、1.0 及 1.4來觀察其反應特性。當Re=200時可以發現不論 C/O 比為何，當入口溫度低於550K時該化學反應並不會被啟動，隨入口溫度增加至 550K 附近時部分氧化反應機制隨之啟動，且當入口溫度降低時甲烷部分氧化反應可以自我維持，此時遲滯效應發生。接著，依據廢熱回收的概念設計一瑞士捲產氫反應器做甲烷催化部分氧化反應，其特點為利用反應過之高溫氣體來預熱未反應之低溫氣體，使反應效果提升，進而達到較高之產氫效率，此結構之特點為 1.具熱回收效果 2.占據體積小 3.節省能源等。模擬結果顯示出在碳氧原子比為 1.0、氣時空速（GHSV）為 10000 h -1時利用二捲瑞士捲行反應之下，相較於未具有廢熱回收之反應器，甲烷轉化率可以由 76.9 % 提升至 93.3%，熱回收率為 62 % ，由此可見此瑞士捲反應器提供了良好的熱回收效果以及產氫效率。

Hysteresis effects and reaction characteristics of methane catalytic partial oxidation (CPOM) in a fixed-bed reactor are numerically simulated. The reactions are modeled based on the experimental measurements of CPOM with a rhodium (Rh) catalyst. Three C/O ratios of 0.6, 1.0 and 1.4 are considered in the study. When the Reynolds number is 200, the predictions
indicate that the CPOM is always triggered at around the inlet temperature of 550 K, regardless of what the C/O ratio is. It is of interest that if the inlet
temperature is decreased after the CPOM develops at higher inlet temperatures, the reversed path of methane conversion is different from the original path at lower inlet temperatures. The hysteresis effect of the CPOM is thus observed. The hysteresis behavior implies that a higher yield of syngas or hydrogen can be achieved by controlling the reaction process. Decreasing the C/O ratio intensifies the CPOM so that the hysteresis effect is more pronounced, and vice versa. An increase in Reynolds number delays the excitation temperature of CPOM and lessens the hysteresis effect of methane conversion due to the growth of fluid inertial force. However, the hysteresis effect of the maximum temperature in the catalyst bed increases as a result of more methane consumption. Then reactor is featured by a Swiss-roll structure in which a rhodium (Rd) catalyst bed is embedded at the center of the reactor. By recovering the waste heat from the product gas to preheat the reactants, it is found that the combustion, steam reforming and dry reforming of methane in the catalyst bed are enhanced to a great extent. As a result, the methane conversion and hydrogen yield are improved more than 10%. Considering the operation conditions, a high performance of hydrogen generation from the CPOM can be achieved if the number of turns in the reactor is increased or the gas hourly space velocity（GHSV）of the reactants in the catalyst bed is lower. Alternatively, the flow direction of the reactants in the reactor almost plays no part in affecting the performance if the waste heat is recovered. It is thus emphasized that the reactor with a Swiss-roll structure can be applied for implementing CPOM with high yield of hydrogen.

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