A New Ceramic–Carbonate Dual-Phase Membrane for High-Flux CO 2 Capture
A New Ceramic–Carbonate Dual-Phase Membrane for High-Flux CO 2 Capture
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用于高通量 CO 2 捕获的新型陶瓷碳酸盐双相膜
DOI：
10.1021/acssuschemeng.1c00860
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发表时间：
2021
影响因子：
8.4
通讯作者：
Huang, Kevin
中科院分区：
文献类型：
--
作者：
Sun, Shichen;Wen, Yeting;Huang, Kevin
基于高温膜的电化学co2捕集技术相对于低温捕集技术而言，具有获得高co2通量而不受选择性限制的优势。较高的工作温度还允许在同一反应器中将捕获的二氧化碳催化转化为有价值的产品，从而降低了总体产品成本。陶瓷-碳酸盐双相膜是近年来兴起的一类新型高温co2捕集技术，其中陶瓷相对其性能起着至关重要的作用。我们在这里报道了多孔的Sc和ce稳定氧化锆（ScCeSZ）作为膜中的一种新的陶瓷相。研究发现，ScCeSZ与熔融碳酸盐（MC）之间的润湿性较差，因此需要用Al2O3等润湿剂对ScCeSZ基体进行表面改性。表面改性的ScCeSZ-MC膜在已有报道的陶瓷-碳酸盐双相膜中CO2通量密度最高，在650℃、15% CO2/75% N2/10% o2和50% CO2/ n2为原料气条件下，CO2通量密度分别达到0.5和1.0 mL/cm2/min。在膜上进行的长期测试表明，在200小时内，该膜具有合理的通量稳定性。研究还发现，在不影响稳定性的情况下，扫描气体中蒸汽的存在将co2通量密度提高了50%。给出了磁通增强的机理。
High-temperature membrane-based electrochemical CO2capture technology is advantageous in achieving high CO2flux without selectivity constraint over its low-temperature counterparts. A high operating temperature also allowsin situcatalytic conversion of the captured CO2into valuable products in the same reactor, thus reducing the overall product cost. Ceramic–carbonate dual-phase membranes are a new class of high-temperature CO2capture technology that emerged in recent years, in which the ceramic phase plays a crucial role in the performance. We here report on porous Sc- and Ce-stabilized zirconia (ScCeSZ) as a new ceramic phase in the membrane. The study finds that the wettability between ScCeSZ and molten carbonate (MC) is rather poor, thus requiring surface modification of the ScCeSZ matrix by a wetting agent such as Al2O3. The surface-modified ScCeSZ-MC membranes show the highest CO2flux density among all ceramic–carbonate dual-phase membranes previously reported, reaching 0.5 and 1.0 mL/cm2/min at 650 °C with 15% CO2/75% N2/10% O2and 50% CO2/N2as the feed gas, respectively. Long-term testing on the membrane indicates a reasonable flux stability over 200 h. The study also observes that the presence of steam in the sweep gas boosts the CO2flux density by 50% without compromising the stability. A mechanism is given to explain the flux enhancement.