本研究是以挑選最適用於合成氣燃燒反應之蜂巢狀波洛斯凱特型觸媒中的媒介層為目標。媒介層為蜂巢狀陶瓷擔體與活性物質之間的媒介。不同媒介層有不同的物理、化學與機械性質，對活性物質會產生不同的交互作用。本研究採用檸檬酸溶膠凝膠法製備不同的金屬氧化物取代原本常用的氧化鋁作為媒介層，在其上擔載波洛斯凱特型觸媒(La0.7Ce0.3Co0.6Mn0.4O3)期能提高所製成的蜂巢狀觸媒的催化活性。在篩選出最能有效提升催化活性的媒介層後，再進行觸媒穩定性測試。也藉由觸媒表面性質的鑑定(BET、XRD及SEM等)與H2-TPR以了解觸媒之表面性質與還原難易，來了解改變媒介層對觸媒催化活性產生的影響。
篩選結果顯示，以氧化鑭為媒介層最能有效提升蜂巢狀觸媒整體的催化活性與穩定性。而改變各媒介層的鍛燒溫度對蜂巢狀觸媒整體活性的影響並不大，主要是因除了氧化鑭之外其餘氧化物晶相並無太大的改變。而氧化鑭晶相會隨著鍛燒溫度有所改變，但披覆上活性物質溶液鍛燒後，晶相僅剩La(OH)3與La2O3兩種。我們單純將氧化鑭披覆在蜂巢狀載體，進行的甲烷燃燒反應測試，發現此兩種晶相的活性相差不大，因而使氧化鑭雖受鍛燒溫度影響晶相，卻不影響蜂巢狀觸媒的活性。氧化鑭媒介層的量對觸媒活性有些微的提升的效果，主要是因為氧化鑭本身擁有不錯的催化活性。而活性物質披覆量的增加對觸媒活性有明顯上升的趨勢，主要是因為披覆量的增加，甲烷與活性物質接觸反應的機會變多。在進料添加H2與CO，會因為競爭吸附與反應而使CH4轉化率略微降低。我們曾分次將媒介層與活性物質披覆在蜂巢狀載體上雖擁有較好的活性，但表面活性物質會有些微脫落的現象。也曾嘗試將氧化鋁、氧化鑭前驅液與活性物質粉末混合後披覆於蜂巢狀載體，發現能形成較為緻密的結構。

The main objective of this research is to select a proper primer for the honeycomb-supported perovskite catalysts for catalyzing syngas combustion. The primer, as a medium, locates between honeycomb cordierite and active species(La0.7Ce0.3Co0.6Mn0.4O3). All kinds of the primers have respective physical, chemical and mechanical properties, and will interact with perovskite. We prepared several metal oxides by sol-gel method to substitute alumina for the ordinary primer in order to enhance catalytic activity performance. After determining the primer which could effectively enhance catalytic activity, we carried out the stability test. We also characterized the catalysts by BET, XRD, SEM and H2-TPR. According to the results obtained from the above-mentioned techniques, we can understand the effects of various primer on catalytic activity.
In catalytic activity tests for methane combustion, we found that lanthanum oxide, as a primer, can enhance catalytic activity and stability effectively. Changing calcination temperature for various primers had less effect on catalytic activity because the crystal phases of these oxides almost have no change except lanthanum oxide. Although the crystal phases of lanthanum oxide changes with calcination temperature after being coated with active species, only the crystal phases of La(OH)¬3 and La2O3 appear. Thereafter, we used lanthanum oxide as the primer to prepare honeycomb catalyst for further study. We found that the above two crystal phases had no obvious difference in their catalytic activity for mehane combusion. Therefore, the change in crystal phases of lanthanum oxide with the calcination temperature did not affect the catalytic activity of monolithic catalyst. When the amount of lanthanum oxide was increased, the catalytic activity was slightly enhanced because lanthanum oxide itself is active. When the amount of active species was increased, catalytic activity was enhanced obviously because the chance for methane to contact with active species was increased. Addition of H2 and CO to the feed slightly inhibited the activity of catalyst for methane combustion, because their competitive adsorption and reaction with methane.
The monolithic catalyst prepared by wash-coating lanthanum oxide on cordierite, followed by loading active species would give a higher activity than that with alumina as the primer. Although twice wash-coating with lanthanum oxide would give a higher activity, active species would tend to flake off. We tried to mix powder of active species with precursor of alumina or lanthanum oxide and then coated it on honeycomb support, the monolith thus prepared had a more stable structure.

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