合成金屬鎳複合氧化鋁氣凝膠應用於二氧化碳/氫氣甲烷化反應

二氧化碳再利用，不但可直接性的消耗二氧化碳無須封存，再利用後可得到具有經濟價值的產物，通常是化學品的原料或是燃料，此種兼具保護環境及經濟價值的方式，對於改善全球暖化是相當好的選擇，而本研究即是開發及製備金屬鎳複合氧化鋁氣凝膠應用於二氧化碳甲烷化反應。二氧化碳甲烷化反應即是一種二氧化碳在利用的方式，藉由二氧化碳與氫氣反應產生具有能源價值的甲烷，在此反應中若能添加同時對氫氣有高親和力對二氧化碳有良好吸附力之觸媒，即可大大降低反應中所需的能量，不需要過高的溫度也不需要加壓即可高效率的生產出甲烷，過去文獻扮演抓住氫原子的角色有銠與釕這兩種金屬，反應性皆相當良好，但因為者兩種金屬成本過高，後來才開發出使用鎳金屬，同樣具有高反應性，成本相對的低很多又適合在較低溫的環境下反應，另外扮演抓住二氧化碳的角色則是需要具有鹼性位且有良好的還原能力以及高比表面積。本研究將利用氧化鋁氣凝膠高比表面積之特性，開發一鎳複合氧化鋁氣凝膠，藉由高比表面積提升反應效果，且藉由金屬鎳與氫氣的高親和力以及氧化鋁易吸附二氧化碳的特性，來達到在低溫下有高轉化率、高選擇比和高產率的目的。本研究將製備出鎳複合氧化鋁氣凝膠，並藉由鎳複合氧化鋁氣凝膠進行甲烷化反應，反應中會探討不同金屬之莫耳比、不同溫度、不同氣體流量下對甲烷化反應之影響，透過氣相層析儀(Gas Chromatography)分析反應結果且找出進行甲烷化反應之最佳條件，並藉由多項材料鑑定儀器證明合成出鎳複合氧化鋁氣凝膠。

關鍵字

金屬氧化物氣凝膠；氧化鋁氣凝膠；鎳複合氧化鋁氣凝膠；二氧化碳再利用；氫化反應；甲烷化反應

並列摘要

The reuse of carbon dioxide not only directly consumes carbon dioxide, but also needs to be sealed. After reuse, it can obtain economically valuable products, usually raw materials or fuels of chemicals. This is a way to protect the environment and economic value. Warming is a good choice, and this study is the development and preparation of metal nickel composite alumina aerogel for carbon dioxide methanation. The carbon dioxide methanation reaction is a way of utilizing carbon dioxide to produce methane with energy value by reacting carbon dioxide with hydrogen. In this reaction, if a catalyst having a high affinity for hydrogen has good affinity for carbon dioxide can be added, It can greatly reduce the energy required in the reaction, and can efficiently produce methane without excessive temperature and pressure. In the past, the literature played the role of capturing hydrogen atoms. They are quite good, but because the two metals are too expensive, they have developed nickel metal, which is also highly reactive. The cost is relatively low and it is suitable for reaction in a lower temperature environment. In addition, it plays the role of capturing carbon dioxide. It is necessary to have a basic position and have good reducing power and high specific surface area. In this study, a high-specific surface area of alumina aerogel will be used to develop a nickel-composite alumina aerogel, which enhances the reaction effect by high specific surface area, and has high affinity for metallic nickel and hydrogen and easy adsorption of carbon dioxide by alumina. The characteristics are to achieve high conversion rate, high selectivity ratio and high yield at low temperatures. In this study, a nickel composite alumina aerogel will be prepared and methanation reaction will be carried out by a nickel composite alumina aerogel. The reaction will investigate the methanation of different metals, methanation at different temperatures and different gas flows. The effect of the reaction was analyzed by gas chromatography (Gas Chromatography) and the optimal conditions for the methanation reaction were found, and a nickel composite alumina aerogel was synthesized by a plurality of material identification instruments.