政大機構典藏-National Chengchi University Institutional Repository(NCCUR):Item 140.119/159395

政大機構典藏-National Chengchi University Institutional Repository(NCCUR):Item 140.119/159395

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Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/159395

Title:	高壓下超導氫化鈀（PdH）的研究及甲烷熱裂解的應用 Investigations into the High-Pressure Superconductivity of PdH and the Applications of Methane Pyrolysis
Authors:	周柏宇 Chou, Po-Yu
Contributors:	陳洋元 Chen, Yang-Yuan 周柏宇 Chou, Po-Yu
Keywords:	高壓超導氫化鈀甲烷熱裂解 PdH Superconductivity Methane Pyrolysis
Date:	2025
Issue Date:	2025-09-01 16:52:36 (UTC+8)
Abstract:	本碩士論文由「氫化鈀(PdH)超導量測與機制探討」和「甲烷熱裂解的應用-去碳燃氫技術」兩個研究主題組成第一部分：氫化鈀〖 PdH〗_x 超導量測與機制探討根據理論模擬顯示，〖 PdH〗_x 具有成為室溫超導體的潛力，而越高的氫含量能使超導轉變溫度T_c上升，然而目前尚未有詳細的實驗研究其特性。因此本研究期望利用高壓摻入更多氫，在實驗中藉由Diamond Anvil Cell (DAC)讓鈀與氫在高壓的環境下反應形成〖 PdH〗_x 樣品，探討壓力與 H_X 之間的關係。本研究結果顯示高壓下〖 PdH〗_x 晶體結構保持穩定，未發生相變或分解；晶格參數隨壓力近似線性減少，未出現異常體積變化或結構轉變跡象。證實利用高壓手段在室溫下製備高氫濃度〖 PdH〗_x 的可行性，同時支持氫化鈀晶格常數隨氫濃度和壓力變化的文獻資料。第二部分：甲烷熱裂解的應用-去碳燃氫技術因應全球氣候變遷與能源轉型的挑戰，發展低碳甚至零碳排的替代能源技術成為各國能源政策的核心。「去碳燃氫技術」是一項兼顧減碳與能源利用效率的新興方案，其核心概念為在不直接排放二氧化碳的情況下，由甲烷等碳氫化合物中裂解出氫氣，並將碳以固態形式分離，進而作為潔淨能源應用。在實驗設計方面，本研究建構一套高溫甲烷裂解系統，並比較流量、溫度、壓力對裂解效率之影響；採用 FID（火焰離子偵測器）進行氫氣純度與殘餘氣體之分析，並結合材料觀察與結構分析技術研究碳產物之特性。結果顯示，裂解效率受反應溫度、壓力與氣體流速顯著影響，且生成的碳材料具備一定的應用價值。在能源效率評估方面，去碳燃氫技術展現出相較傳統重整法更具潛力的能效表現。 Part Ⅰ – Investigations into the High-Pressure Superconductivity of PdH： First-principles calculations predict that raising the hydrogen content in〖 PdH〗_x can increase the superconducting transition temperature T_c toward room temperature, yet experimental confirmation remains limited. To access higher hydrogen stoichiometry, we reacted palladium with hydrogen inside a diamond-anvil cell (DAC) at multi-gigapascal pressures. In-situ X-ray diffraction reveals that the face-centered-cubic lattice of〖 PdH〗_x stays structurally intact; its lattice constant decreases almost linearly with pressure and shows no sign of phase transition or decomposition. These results demonstrate the feasibility of preparing high-hydrogen 〖 PdH〗_x at ambient temperature through high-pressure techniques and corroborate literature trends relating lattice expansion to hydrogen concentration and pressure. This work provides a structural basis for future studies of pressure-enhanced superconductivity in palladium hydrides. Part ⅠI – the Applications of Methane Pyrolysis： Amid global efforts to mitigate climate change and transform energy systems, low- and zero-carbon technologies are strategic priorities. Methane thermal cracking offers a promising route: hydrogen is liberated without direct 〖CO〗_2 release, while carbon is isolated as a stable solid usable in value-added applications. We built a high-temperature (≤ 1500 °C) reactor to systematically examine how flow rate, temperature, and pressure influence methane conversion. A flame-ionization detector (FID) quantified hydrogen purity and residual gases, and complementary microscopy and diffraction characterized the resulting carbon. Conversion efficiency rose markedly with elevated temperature, optimized flow, and moderate pressure, and the carbon products exhibited morphologies suitable for conductive fillers or battery additives. Energy-efficiency analysis indicates that methane cracking can outperform conventional steam reforming—especially when 〖CO〗_2 capture costs are considered—while simultaneously supplying high-purity hydrogen and marketable carbon materials.
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Description:	碩士國立政治大學應用物理研究所 112755006
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