觸媒燃燒已被證實為可有效降低污染、穩駐貧油燃燒且不致降低效率之燃燒技術，然而其應用卻限制於觸媒的耐溫性以及點火能力，其中耐溫性屬於材料性質部分，需藉由新的耐高溫觸媒開發以獲最終之解決。而點火能力方面，一般而言，觸媒反應需具備足夠之能量以促使反應物產生化學吸附並進一步反應，因此外加能量供給似乎已成為觸媒燃燒之必備條件。然而，此舉卻造成了能源的浪費以及加熱不易的窘境，不利於觸媒燃燒之實際需求。由於氫氣可於室溫下點燃，氫氣輔助點燃被視為應加緊研究並廣泛加以運用的輔助觸媒點燃技術。一直以來，氫氣輔助點燃的途徑因素均指向thermal上，因氫氣預反應使得溫度提升達欲輔助點火燃料之可燃溫度進而達觸媒點燃之目的。然而比較甲烷以及氫氣的吸附與擴散特性，以及氫氣預反應時所造成的自由基分布，此論點尚存在相當多的疑點尚待證實。本研究利用實驗量測以及非定常二維觸媒管道計算模擬對氫氣輔助甲烷觸媒點燃作一詳盡的探討，以期對氫氣輔助點燃之機制有進一步的了解。
　　本研究藉由甲烷點火特徵、表面與氣相反應化學性質之探討，配合不同之氫氣/甲烷/空氣混合氣注入方式以及相關之計算模擬，結果顯示了氫氣預反應之操作條件下具有較佳之點火能力，且經由氫氣預反應觸媒表面溫度與外加能量之點燃比較，證實了氫氣輔助點燃非單純之熱輔助效應所致，而是存在有另一控制因素。計算模擬上顯示了C(*)覆蓋活性區造成觸媒毒化為低溫、低氫氣含量氫氣/甲烷/空氣混合氣表面觸媒反應點燃失敗的主要原因，而C(*)與H(*)對O(*)的競爭則為關鍵。氫氣預反應所產生之自由基可有效減緩C(*)覆蓋的生成，促進甲烷表面反應。此外，氫氣輔助甲烷觸媒點燃主要是藉由表面反應啟動，進而點燃整個點火過程，而此階段點燃成功與否之關鍵則為瞬間提升之溫度。研究亦發現由於表面反應與氣相反應條件之競爭，點火過程會有不同模態產生。最佳之實用操作則建議於高氫氣含量之輔助點燃為優，可使操作上獲得簡易有效之點火控制。

　　Catalytic combustion has proved to be an effective way to stabilize ultra lean combustion for various fuels with acceptable pressure loss. Current applications are limited by the high mixture temperature necessary for chemisorption of fuel and subsequent ignition on surface. Addition of hydrogen to the fuel may help reduce the ignition temperature because ignition of hydrogen on platinum can occur at room temperature. The thermal effect is intuitively thought to be the main factor of the hydrogen-assisted catalytic ignition process, but evidence of this inference is lacking. Due to the high diffusivity and sticking coefficient of hydrogen, the competition between the adsorption of hydrogen and fuel on the catalyst needs to be considered. In addition, the effects of hydrogen on radical pools on the surface and their potential impact on possible gas phase reactions need to be explored. To this end, experimental measurements of transient behaviors of hydrogen-assisted methane-air catalytic combustion were conducted. Two-dimensional numerical simulations with a multi-step gas phase mechanism and surface reaction mechanism have been performed to provide a better understanding of the underlined processes. The characteristics of hydrogen-assisted catalytic ignition are examined and compared with externally heated ignition cases. Comparing to the externally heated ignition, lower ignition temperatures are achieved for methane/hydrogen mixture if the catalyst is fed with a hydrogen-air mixture first, a pre-reacting processing. The results of numerical simulations suggest that in addition to thermal effect, chemical kinetics on the catalyst surface can also play an important role in hydrogen-assisted catalyst combustion. For instance, the competition between the oxidation channels between surface species H(*) and C(*) is found in the hydrogen/methane/air mixture catalytic reaction. Detailed analysis on the interactions between various surface reactions and potential gas-phase ignition has been carried out and compared to experimental data.

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