合成氧化鋁氣凝膠負載鐵摻雜三氧化二鎳奈米粒子應用於二氧化碳/氫氣甲烷化反應

二氧化碳為造成全球溫室效應的因素之一，科學家近年來進行如何將二氧化碳在利用，不但可以減少二氧化碳在大氣中的含量，亦可得到具經濟價值之產物。　　　二氧化碳甲烷化反應為一種二氧化碳再利用的一種方式，透過二氧化碳與氫氣反應產生具經濟價值之甲烷；若在此反應中加入對氫氣具親和力及對二氧化碳有良好吸附性之觸媒，可以降低反應所需之能量，在常壓低溫環境下即可產出甲烷；過去文獻中，通常使用反應性較佳的貴金屬釕、銠來扮演解離氫氣的角色，但這兩種金屬成本高昂，因此，選擇反應性佳、成本較低且在低溫下即能反應之鎳金屬，由於單金屬在升溫過程易造成金屬團聚失去活性，故逐漸開發出雙金屬觸媒，本研究選擇金屬鎳鐵，鐵的摻雜增加氣體的吸附及提升其活性位點，載體需具高比表面積、良好的還原能力及鹼性位點之特性。綜合上述，本研究製備氧化鋁氣凝膠負載鐵摻雜三氧化二鎳奈米粒子，透過鎳鐵與氫氣之親和力、氧化鋁易於吸附及還原二氧化碳之特性，達到在常壓低溫之環境下，得到具經濟價值之甲烷。　　　本研究將合成氧化鋁氣凝膠負載鐵摻雜三氧化二鎳奈米粒子，進行二氧化碳甲烷化反應，對反應參數進行探討，針對不同金屬之莫耳比、不同氣體流量、不同溫度下影響甲烷化反應之效果，藉由氣相層析儀進行分析結果，找出最適合此反應之操作參數，並透過多種材料檢測儀器來證明成功合成氧化鋁氣凝膠負載鐵摻雜三氧化二鎳奈米粒子。

關鍵字

甲烷化反應；氫化反應；雙金屬催化劑；氧化鋁氣凝膠負載鐵摻雜三氧化二鎳奈米粒子

並列摘要

Carbon dioxide is one of the reason causing global warming. The main technology is still carbon dioxide capture and storage in recent year, but it still has safety doubt about capturing and storing carbon dioxide. In recent year, scientists have studied how to reuse carbon dioxide. The method of reuse carbon dioxide is not only decrease the concentration of carbon dioxide but also obtain economy products. This way of maintaining the environment and having economic value is a great choice to improve global warming. Methanation reaction is one of the method to reuse carbon dioxide through the reaction of carbon dioxide and hydrogen to produce methane. If the reaction adds the catalysts with affinity for hydrogen and good adsorption for carbon dioxide, the energy required for the reaction can be reduced,and methane can be produced under normal pressure and low temperature environment. In the past reference,the ruthenium and rhodium are usually used to play the role of dissociating hydrogen used, but both ruthenium and rhodium are expensive. Therefore, choose nickel metal that it has good reactivity, low cost, and can react at low temperatures.Since the single metal is easy to cause the metal sintering to lose activity during the heating process, the bimetallic catalyst is gradually developed. In this study, the metal nickel and iron is selected. The addition of iron increases the adsorption of gas and enhances its active site. The carrier needs to have a high specific surface area, good reducing ability and the characteristics of basic sites. In summary, the metal nickel and iron composite alumina aerogel prepared in this study through the affinity of nickel iron with hydrogen. In addition, the alumina is easy to adsorb and reduce carbon dioxide, and achieve the methane which has the economic value under normal pressure and low temperature environment. 　　　In this study, Fe-doped Ni2O3 nanoparticles/Al2O3 aerogel composites will be prepared and methanation reaction will be carried out by this catalyst. The reaction will explore the methanation of different molar ratio, methanation at different gas flow rate and different temperature. The effect of the reaction will analyzed by gas chromatography. Finally, the optimal conditions in the methanation reaction were found . The Fe-doped Ni2O3 nanoparticles/Al2O3 aerogel composites was synthesized by a plurality of material identification devices.