通过掺杂钽的钙钛矿膜实现稳健氧气分离的增强 CO2 耐受性。
Enhanced CO2 Resistance for Robust Oxygen Separation Through Tantalum-doped Perovskite Membranes.
机构信息
Department of Chemical Engineering, Curtin University, Perth, Western Australia, 6845, Australia.
School of Chemical Engineering, Shandong University of Technology, Zibo, 255049, China.
出版信息
ChemSusChem. 2016 Mar 8;9(5):505-12. doi: 10.1002/cssc.201501395. Epub 2016 Jan 27.
Oxygen selective membranes with enhanced oxygen permeability and CO2 resistance are highly required in sustainable clean energy generation technologies. Here, we present novel, cobalt-free, SrFe1-x Tax O3-δ (x=0, 0.025, 0.05, 0.1, 0.2) perovskite membranes. Ta-doping induced lattice structure progression from orthorhombic (x=0) to cubic (x=0.05). SrFe0.95 Ta0.05 O3-δ (SFT0.05) showed the highest oxygen flux rates reaching 0.85 mL min(-1) cm(-2) at 950 °C on a 1.0 mm-thick membrane. Surface decoration can increase the permeation rate further. Ta inclusion within the perovskite lattice of SrFeO3-δ (SF) enhanced the CO2 resistance of the membranes significantly as evidenced by the absence of the carbonate functional groups on the FTIR spectrum when exposed to CO2 atmosphere at 850 °C. The CO2 resistance of Ta-doped SF compounds correlates with the lower basicity and the higher binding energy for the lattice oxygen. SFT0.05 demonstrated high stability during long-term permeation tests under 10% CO2 atmosphere.
在可持续清洁能源技术中，人们高度需要具有增强氧气渗透性和抗二氧化碳能力的氧气选择性膜。在这里，我们提出了新型的、不含钴的 SrFe1-xTaxO3-δ（x=0、0.025、0.05、0.1、0.2）钙钛矿膜。Ta 掺杂诱导晶格结构从正交相（x=0）向立方相（x=0.05）演变。SrFe0.95Ta0.05O3-δ（SFT0.05）在 1.0 毫米厚的膜上在 950°C 时表现出最高的氧气通量率，达到 0.85 mL min(-1) cm(-2)。表面修饰可以进一步提高渗透速率。Ta 掺入 SrFeO3-δ（SF）钙钛矿晶格中，显著提高了膜的抗二氧化碳能力，这一点可以从在 850°C 的 CO2 气氛下暴露时 FTIR 光谱上没有碳酸盐官能团得到证明。Ta 掺杂的 SF 化合物的抗二氧化碳能力与较低的碱性和晶格氧的更高结合能相关。在 10%CO2 气氛下进行长期渗透测试时，SFT0.05 表现出高稳定性。
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