全球二氧化碳與甲烷等溫室氣體(Greenhouse Gases， GHGs)排放量持續增加，過量溫室氣體排放強化溫室效應，造成全球暖化、氣候變遷、極端氣候事件增加、海平面上升及生態系統失衡等環境問題。因此，淨零碳排與溫室氣體利用技術逐漸受到重視。其中，甲烷乾重組(Dry Reforming of Methane， DRM)因可同時轉化甲烷與二氧化碳兩大溫室氣體，並生成具利用價值之合成氣或液態含氧產物而成為近年重要研究方向。本研究以介電質放電進行甲烷乾重組反應，並以銅做為活性相，探討Al2O3、TiO2、La2O3及BaTiO3四種不同載體之物化性質對CH4/CO2轉化、產物分布與能量效率之影響。結果顯示在本研究操作條件下，Cu/TiO2為整體表現最均衡之觸媒，其甲烷與二氧化碳轉化率分別為35.5%及21.2%；一氧化碳與氫氣選擇性分別為31.69%及25.71%；甲醇與甲酸選擇性分別為36.37%及14.35%。Cu/La2O3則因具有較強表面鹼性與二氧化碳吸附能力，展現最高之二氧化碳轉化率與甲酸選擇性，分別為26.87%及26.63%。在能量效率方面，Cu/BaTiO3最具優勢，達0.51 mmol/kJ，顯示高介電特性有助於提升單位能量下之反應物轉化能力。材料特性分析顯示，Al2O3具有最高比表面積，有利於活性相分散；BaTiO3具有最高介電常數，可影響放電行為與能量利用；La2O3具有最強表面鹼性，有助於CO2吸附與活化；TiO2則兼具中高比表面積、較高介電常數及中強表面鹼性，使其在轉化率、液態產物選擇性與能量效率間呈現較佳平衡。綜上所述，本研究選用之四種觸媒載體各具其特性，而實驗結果也顯示其特性對反應具有實質影響，可為後續研究提供參考。此外，本研究成功於低溫條件下生成以甲醇為主之液態產物，可做為能源或化學品原料，顯示電漿催化技術除溫室氣體減量外，亦具有生成液態燃料或化學品原料之發展潛力。;Global emissions of greenhouse gases (GHGs)， such as carbon dioxide and methane， have continued to increase， intensifying the greenhouse effect and causing environmental problems including climate change， frequent extreme weather events， sea level rise， and ecosystem imbalance. Therefore， net-zero carbon emissions and greenhouse gas utilization technologies have received increasing attention. Among them， dry reforming of methane (DRM) has become an important research direction because it can simultaneously convert methane and carbon dioxide into valuable syngas or liquid oxygenated products. In this study， dielectric discharge was applied to the dry reforming of methane， with copper used as the active phase， to investigate the effects of the physicochemical properties of four supports， Al2O3， TiO2， La2O3， and BaTiO3， on CH4/CO2 conversion， product distribution， and energy efficiency. The results showed that， under the operating conditions of this study， Cu/ TiO2 exhibited the most balanced overall performance， with CH4 and CO2 conversions of 35.5% and 21.2%， CO and H2 selectivity of 31.69% and 25.71%， and methanol and formic acid selectivity of 36.37% and 14.35%， respectively. Cu/La2O3， owing to its stronger surface basicity and CO2 adsorption capacity， showed the highest CO2 conversion and formic acid selectivity， reaching 26.87% and 26.63%， respectively. In terms of energy efficiency， Cu/BaTiO3 exhibited the best performance， reaching 0.51 mmol/kJ， indicating that high dielectric properties are beneficial for improving reactant conversion per unit energy. Material characterization showed that Al2O3 had the highest specific surface area， favoring active phase dispersion; BaTiO3 had the highest dielectric constant， affecting discharge behavior and energy utilization; La2O3 had the strongest surface basicity， enhancing CO2 adsorption and activation; and TiO2 possessed a medium-high specific surface area， relatively high dielectric constant， and medium-strong surface basicity， enabling a better balance among conversion， liquid product selectivity， and energy efficiency. Overall， the selected catalyst supports exhibited distinct properties that substantially influenced the reaction performance. In addition， this study successfully generated methanol-dominated liquid products under low-temperature conditions， which can serve as energy sources or chemical feedstocks， demonstrating the potential of plasma catalysis not only for greenhouse gas reduction but also for liquid fuel and chemical production.
