由於全球能源需求增加與化石燃料大量使用，二氧化碳排放所造成的溫室效應與氣候變遷問題日益受到重視，將二氧化碳轉化為高附加價值化學品或燃料，被認為是兼具減碳效益與資源再利用潛力的重要策略。其中，二氧化碳氫化生成甲醇不僅可降低二氧化碳排放，也能提供液態燃料、氫氣載體及化學工業原料。 高熵合金因具有多元素組成、高組態熵、晶格扭曲及多樣化表面活性位點等特性，在催化反應中展現出不同於傳統單金屬或雙金屬觸媒的潛力，多種金屬元素共存可提供不同吸附與活化能力之反應位點，並可能透過元素間交互作用調控反應中間物的吸附與表面反應路徑。本研究選用 Fe、Co、Ni、Cu 及 Zn 作為主要金屬組成，期望透過多金屬組成設計，建立具有催化潛力的高熵合金觸媒。 本研究以 γ-Al2O3 作為載體，採用含浸法製備 FeCoNiCu 及 FeCoNiCuZn 系列高熵氧化物，並進一步經由氫氣還原觸媒，研究中設計不同金屬莫耳比例，包括 FeCoNiCu、FeCoNiCuZn、FeCoNiCu1.25Zn0.75 及 FeCoNiCu1.5Zn0.5，探討金屬組成與還原條件對觸媒性質之影響。觸媒特性分析包含 XRD、TPR、CO2-TPD、NH3-TPD、氮氣吸脫附分析、ICP及HR-TEM，用以評估觸媒之晶體結構、還原行為、孔洞特性、元素組成及微觀形貌。 本研究主要目的為建立FeCoNiCu 及 FeCoNiCuZn 高熵合金觸媒，並探討不同金屬組成及還原條件對觸媒結構與物化性質之影響，透過觸媒組成與結構特性之分析，作為後續應用於二氧化碳氫化生成甲醇反應之基礎，提供高熵合金觸媒在二氧化碳轉化反應中設計與優化之參考。;With the increasing global energy demand and extensive use of fossil fuels， the greenhouse effect and climate change caused by carbon dioxide emissions have received growing attention. Converting carbon dioxide into high-value-added chemicals or fuels is regarded as an important strategy with both carbon reduction benefits and resource utilization potential. Among various CO2 conversion routes， CO2 hydrogenation to methanol can not only reduce carbon dioxide emissions but also provide a liquid fuel， hydrogen carrier， and chemical feedstock. High-entropy alloys have shown catalytic potential distinct from conventional monometallic or bimetallic catalysts owing to their multicomponent composition， high configurational entropy， lattice distortion， and diverse active sites on the surface. The coexistence of multiple metal elements can provide reaction sites with different adsorption and activation abilities and may regulate the adsorption of reaction intermediates and surface reaction pathways through interactions among different elements. In this study， Fe， Co， Ni， Cu， and Zn were selected as the main metal components， with the aim of developing high-entropy alloy catalysts with catalytic potential through multimetallic composition design. In this study， γ- Al2O3 was used as the support， and FeCoNiCu and FeCoNiCuZn-based high-entropy oxides were prepared by the impregnation method， followed by hydrogen reduction. Different metal molar ratios were designed， including FeCoNiCu， FeCoNiCuZn， FeCoNiCu1.25Zn0.75， and FeCoNiCu1.5Zn0.5， to investigate the effects of metal composition and reduction conditions on the properties of the catalysts. The catalysts were characterized by XRD， TPR， CO2-TPD， NH3-TPD， nitrogen adsorption–desorption analysis， ICP， and HR-TEM to evaluate their crystal structure， reduction behavior， pore properties， elemental composition， and microstructure. The main objective of this study is to establish FeCoNiCu and FeCoNiCuZn high-entropy alloy catalysts and to investigate the effects of different metal compositions and reduction conditions on their structures and physicochemical properties. Through the analysis of catalyst composition and structural characteristics， this study provides a basis for future application in CO2 hydrogenation to methanol and offers a reference for the design and optimization of high-entropy alloy catalysts in CO2 conversion reactions.
