銅鈰氧化物觸媒在富氫氣氛中對一氧化碳選擇性氧化的研究

Investigation on CuO/CeO2 Mixed Oxide Catalyst for Preferential Oxidation of CO in Excess Hydrogen

吳善棋(Shan-Chi Wu)

指導教授 ： 鄭淑芬

國立臺灣大學/理學院/化學研究所/碩士(2009年)

https://doi.org/10.6342/NTU.2009.01723

摘要

本研究的重點在尋找一個最好的方法來合成銅鈰氧化物以及摻雜鹼金屬如鎂、鎘和鈣的銅鈰氧化物，使得該化合物在富氫條件下可以擁有良好的CO轉化率以及CO選擇率，可用於氫氣的純化。我們利用直接鍛燒法、檸檬酸鹽法、共沉澱法以及物理混合法。其中，物理混合法在銅鈰氧化物以及摻雜鹼金屬的銅鈰氧化物皆可以得到最好的活性。我們並利用XRD, TPR, XAS以及氮氣吸脫附儀來對該觸媒作鑑定並探討反應可能進行的機制。反應活性則由通入組成為He:CO:O2:H2 = 48.4: 0.8:0.8:50 的氣體來選擇性氧化測試。本實驗同時也探討不同通入氣體組成以及添加水與二氧化碳對觸媒活性的影響。最後並進行200小時以上的催化實驗測試其穩定度。

關鍵字

選擇性氧化 ； PROX ； 銅鈰氧化物 ； 物理混合法 ； CO轉化

並列摘要

This study is focusing on searching a new method to prepare Cu-Ce mixed oxide catalysts and Cu-Ce mixed oxide catalysts doped with base metal such as magnesium, gadolinium and calcium in the cause of finding an ideal PROX catalyst. Direct decomposition, citric acid process and physical mixing methods were introduced in which physical mixing show good results in both doped and undoped catalyst. The catalysts were characterized by XAS, XRD, BET, TPR and were tested by feeding a stream of H2/CO/O2/He in the ratio of 50/0.8/0.8/48.4. Different feed composition has also been tested with altering O2/CO ratio and adding water and CO2 to the feed. A time-on-stream test has also been tested to see its stability.

並列關鍵字

CuO ； CeO2 ； PROX ； in-situ XAS ； physical mixing

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