製備以奈米氧化錳與多壁奈米碳管複合觸媒附載修飾電極應用於電催化甲烷氧化至甲醇;Preparation of Nano-manganese Oxide-Multiwall Carbon Nanotube Composite Catalysts on Carbon Electrodes for Electrocatalytic Methane Oxidation to Methanol

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题名:	製備以奈米氧化錳與多壁奈米碳管複合觸媒附載修飾電極應用於電催化甲烷氧化至甲醇;Preparation of Nano-manganese Oxide-Multiwall Carbon Nanotube Composite Catalysts on Carbon Electrodes for Electrocatalytic Methane Oxidation to Methanol
作者:	林易辰;Lin, Yi-Chen
贡献者:	化學學系
关键词:	電化學;氧化錳;electrochemical;Manganese oxide
日期:	2024-07-18
上传时间:	2024-10-09 15:22:37 (UTC+8)
出版者:	國立中央大學
摘要:	過度使用化石燃料是導致大氣中CO2與CH4含量增加的主要原因，這將加劇全球變暖、海平面上升等其他環境問題，但同時CO2與CH4是一種豐富的碳源，可以轉化為具有經濟價值的化學品。由於 CH4 的極高穩定性和 CH3OH 的相對較高反應性，CH4 的活化和對 CH3OH 產物的選擇性具有挑戰性。本研究致力於合成氧化錳催化劑，應用於氧化CH4進而產出甲烷。採用水熱法及高溫鍛燒製備材料，以數種不同的儀器鑑定材料本身特性，藉由XRD去判斷材料在不同前驅物混和比例下去鍛燒後的結晶性，以及比對出材料的晶面及晶體結構;亦使用SEM/SEM-EDX與TEM/TEM-EDX去觀察實際材料表面樣貌;另外還有藉由進行In-situ的X-ray吸收光譜去監測實際反應進行的材料變化; 至於電催化產物鑑定，則應用質子核磁共振光譜儀，經內標法測量液體產物的產出，求得單位時間、電極表面積之產物反應速率暨法拉第效率，更進一步透過調整實驗反應條件：像是MWCNT/Mn莫爾比例、電位的調整、電解液的選擇以及混合氣體與氣體流量的調控，去優化得出最佳材料與反應條件。在適當的反應條件下，製備出的材料可以達到良好的催化活性。接著像是簡單來說，透過選擇不同的裝置(如H-cell或Flow-cell)，再到材料的構思製備優化，以及實驗條件的設定到材料的鑑定，都會在本篇研究中詳細探討。 ;The excessive use of fossil fuels results in the increased CO2 and CH4 concentrations in the atmosphere, which exacerbates global warming, sea level rise, and other environmental problems. However, CO2 and CH4 are abundant carbon sources that can be converted into economically valuable chemicals. Due to the high stability of CH4 and the relatively high reactivity of CH3OH, the activation of CH4 and the selectivity for CH3OH products are challenging. This study aims to synthesize manganese oxide (MOx) catalysts for the oxidation of CH4 to produce methanol. Materials are prepared using hydrothermal methods and high-temperature calcination. Various instruments are used to characterize the properties of the catalyst materials and the production of the products. Powder X-ray Diffraction (PXRD) was used to determine the crystallinity of materials and to compare their crystal phaces and structures of the materials by varying the Mn compositions in MWCNT. Scanning Electron Microscopy/Energy Dispersion X-ray spectrometry (SEM-EDX) and Transmission Electron Microscopy (TEM)-EDX are used to observe the shape, surface morphology of the catalyst materials for inspiring the catalyst surface microenvironment. In addition, in-situ X-ray absorption spectroscopy is conducted to monitor the changes in the materials in a time-resolved manner. The production of liquid products and Faradaic efficiency calculations are determined using NMR for product quantification. By adjusting experimental reaction conditions such as the molar ratio of MWCNT/Mn, varying the applied potentials, electrolyte selection, and the control of gas mixing ratios and gas flow rates, and the optimization of the materials and reaction conditions are determined. Under appropriate reaction conditions, the prepared materials can achieve good catalytic activity. In summary, this study will comprehensively explore the choice of different devices (such as H-cell or Flow-cell), the design and optimization of materials, the setting of experimental conditions, and the characterization of materials.
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