标题: | 制备钯金属陶瓷复合膜应用于高温氢气与二氧化碳分离 Synthesis of Dense Palladium-based Cermet Membrane for H2 and CO2 Separation at Elevated Temperature |
作者: | 蔡延璋 Tsai, Yen-Chang 吴朴伟 林鹏 Wu, Pu-Wei Lin-Pang 材料科学与工程学系所 |
关键字: | 质导陶瓷;钯金属;氢气分离;导电度;Proton conductive ceramic;palladium;hydrogen separation;conductivity |
公开日期: | 2014 |
摘要: | 本研究藉由混合钯金属及质导陶瓷(BaCe0.4Zr0.4Gd0.1Dy0.1O3-x; BCZGD)粉末,经球磨压碇,于1450度空气环境下烧结24小时后成功制备出一种金属陶瓷复合材料。此材料在氢气与二氧化碳混合环境中展现了优异的氢气渗透能力。此材料性质透过扫描式电子显微镜 (SEM)、X光绕射分析仪 (XRD)及热重分析仪 (TGA)做鉴定分析; XRD显示除了钯金属与质导陶瓷之特征峰外,试片烧结前后并无其它明显之杂相生成;TGA也证实了材料对CO2有良好之化学稳定性;透氢测试部分,藉由气相层析仪量测摄氏温度400到700度间不同氢气浓度梯度下此材料所渗透之氢气流量,另外在氢气与二氧化碳混和比例一比一的情况下,此材料能完全分离氢气与二氧化碳,分离系数比趋近无穷大,并同时具有每分钟每平方公分1.25毫升之氢气渗透流量。 A cermet composite consisting of palladium and BaCe0.4Zr0.4Gd0.1Dy0.1O3-x (BCZGD) is fabricated by mixing palladium and BCZGD powders in a ball mill, followed by pressing and sintering at 1450°C for 24 h in air. The Pd-BCZGD cermet demonstrates impressive hydrogen permeation flux in a mixture of hydrogen and carbon dioxide at elevated temperature. Material characterization including scanning electron microscopy (SEM), X-ray diffraction (XRD), and thermo-gravimetric analysis (TGA) are performed. XRD patterns indicate pure phases of fcc palladium and perovskite BCZGD. SEM images and element mapping suggest a homogeneous mixture of cermet without noticeable defect and phase segregation. TGA results confirm stability of the cermet against carbon dioxide without chemical decomposition. The hydrogen permeation flux is determined via a gas chromatography from 400 to 700°C at various hydrogen concentration gradients. We record a hydrogen flux of 1.25 cm3 min-1 cm-2 in 50% hydrogen and 50% carbon dioxide at 700°C, with a selectivity of H2/CO2 approaching infinity. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT070151543 http://hdl.handle.net/11536/75815 |
显示于类别: | Thesis |